Starting STM8 Microcontrollers

Communication Overview

STM8 microcontrollers are packed with several communication interfaces. These interfaces are needed to communicate with external devices like sensors, actuators, drives, etc. The most commonly used ones are Serial Communication (UART), Serial Peripheral Interface (SPI) and Inter-Integrated Circuit (I2C). There are also other additional more robust communication interfaces like Controller Area Network (CAN), Local Interconnect Network (LIN), Infrared Data Association (IrDA) and RS-485. The latter communications will not be discussed here in this article and are kept for future issues. These are methods are, however, not frequently used and are special forms of communications. For example, CAN and LIN are mostly used in automotive industries. Each method communication has its own advantages and disadvantages. Here we’ll see the individual basics of various methods of communications.

Comms Comparision

In STM8 microcontrollers, LIN, IrDA, RS-485 and UART all share the UART hardware peripheral. For other communications, there are dedicated separate hardware. We will now be exploring the basic ones here.

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  • Hi sir, Thank you very much for making all of these beneficial tutorials.

    I have a problem. Please resolve it.

    I am using the stm8s003f3p6 development board.

    In my board TIM1_CH1 is on pin PC6, I have configured it as below instead of PC1 as you did.

    I am using the “stm8s103_serial.h” library instead of LCD to print the time period.

    Below is the code:
    #include “STM8S.h”
    #include “stm8s103_serial.h”

    unsigned int overflow_count;
    unsigned long pulse_ticks;
    unsigned long start_time;
    unsigned long end_time;
    unsigned long int time_period;

    void clock_setup(void);
    void GPIO_setup(void);
    void TIM1_setup(void);
    void TIM2_setup(void);

    void delay_ms (int ms) //Function Definition
    {int i,j;
    for (i=0; i<=ms; i++)
    for (j=0; j<120; j++) // Nop = Fosc/4
    _asm("nop"); //Perform no operation //assembly code

    void main()
    int cnt = 0;



    time_period = pulse_ticks;

    void clock_setup(void)

    while(CLK_GetFlagStatus(CLK_FLAG_HSIRDY) == FALSE);



    CLK_PeripheralClockConfig(CLK_PERIPHERAL_SPI, DISABLE);
    CLK_PeripheralClockConfig(CLK_PERIPHERAL_I2C, DISABLE);
    CLK_PeripheralClockConfig(CLK_PERIPHERAL_ADC, DISABLE);
    CLK_PeripheralClockConfig(CLK_PERIPHERAL_AWU, DISABLE);
    CLK_PeripheralClockConfig(CLK_PERIPHERAL_UART1, ENABLE);
    CLK_PeripheralClockConfig(CLK_PERIPHERAL_TIMER1, ENABLE);
    CLK_PeripheralClockConfig(CLK_PERIPHERAL_TIMER2, ENABLE);
    CLK_PeripheralClockConfig(CLK_PERIPHERAL_TIMER4, DISABLE);

    void GPIO_setup(void)


    void TIM1_setup(void)
    TIM1_TimeBaseInit(2000, TIM1_COUNTERMODE_UP, 55535, 1);
    TIM1_ITConfig(TIM1_IT_CC1, ENABLE);


    void TIM2_setup(void)
    TIM2_TimeBaseInit(1,16550);//ARR = 16550 for 60Hz,1 as prescaler
    TIM2_SetCompare1(8225);//16550/2 = 50% duty

    @far @interrupt void TIM1_UPD_IRQHandler(void)

    @far @interrupt void TIM1_CH1_CCP_IRQHandler(void)

    end_time = TIM1_GetCapture1();
    pulse_ticks = ((overflow_count << 16) – start_time + end_time);
    start_time = end_time;
    overflow_count = 0;


  • Thank you for making all of these good tutorials.

    I have some problems

    ----------- Project blink - STM8 Cosmic - Configuration Debug -------------

    Compiling d:\stm8ssaucefiles\delay.c...
    cxstm8 -id:\stm8ssaucefiles +debug -pxp -no -l +mods0 -pp -i"C:\Program Files (x86)\COSMIC\FSE_Compilers\CXSTM8\Hstm8" -clDebug\ -coDebug\ d:\stm8ssaucefiles\delay.c

    Compiling stm8_interrupt_vector.c...
    cxstm8 -id:\stm8ssaucefiles +debug -pxp -no -l +mods0 -pp -i"C:\Program Files (x86)\COSMIC\FSE_Compilers\CXSTM8\Hstm8" -clDebug\ -coDebug\ stm8_interrupt_vector.c

    Running Linker
    clnk -m Debug\ -l"C:\Program Files (x86)\COSMIC\FSE_Compilers\CXSTM8\Lib" -o Debug\blink.sm8 Debug\blink.lkf
    #error clnk Debug\blink.lkf:1 symbol _GPIO_DeInit not defined (Debug\main.o )
    #error clnk Debug\blink.lkf:1 symbol _GPIO_Init not defined (Debug\main.o )
    #error clnk Debug\blink.lkf:1 symbol _GPIO_ReadInputPin not defined (Debug\main.o )
    #error clnk Debug\blink.lkf:1 symbol _GPIO_WriteReverse not defined (Debug\main.o )
    The command: "clnk -m Debug\ -l"C:\Program Files (x86)\COSMIC\FSE_Compilers\CXSTM8\Lib" -o Debug\blink.sm8 Debug\blink.lkf " has failed, the returned value is: 1
    exit code=1.

    blink.elf - 6 error(s), 0 warning(s)

    Is there anything i could do to resolve this error ?
    Because in your other tutorial (Driving LCD with I2C), i have this kind of error too (with I2C addition)

    Once again,
    Thank you for making all of these good tutorials.

  • Utsav savaliuya

    I am trying to implement simple spi communication between 2 stm8s. Sending 0x04( address of pin2) and passing the received data as argument to GPIO high function so that LED connected at PORT D PIN 2 will glow. Master code is working properly, degugging properly, but in slave the TXE is not becoming 1 and program is stuck there only. Does any one can help locating the problem if its in code?

    Master code:

    #include “stm8s.h”
    #include “stm8s_gpio.h”
    #include “stm8s_spi.h”
    #include “stm8s_clk.h”

    void GPIO_setup(void);
    void clock_setup(void);

    void GPIO_setup(void)
    { GPIO_DeInit(GPIOC);
    // led pin

    GPIO_Init(GPIOC, GPIO_PIN_7, GPIO_MODE_IN_PU_NO_IT);//miso pin 7


    void clock_setup(void)
    while(CLK_GetFlagStatus(CLK_FLAG_HSIRDY) == FALSE);



    void main(void)


    GPIO_WriteLow(GPIOA,GPIO_PIN_3);// pull nss low
    SPI_SendData(0x04);//pin 2 address
    while(SPI_GetFlagStatus(SPI_FLAG_TXE)== RESET);

    GPIO_WriteHigh(GPIOA,GPIO_PIN_3);// pull NSS high
    SPI_Cmd(DISABLE);// disable spi


    #define STM8S103
    #include “stm8s.h”
    #include “stm8s_clk.h”
    #include “stm8s_gpio.h”
    #include “stm8s_spi.h”

    uint8_t RxBuffer2=0;
    void main(void)

    GPIO_Init(GPIOC,GPIO_PIN_6,GPIO_MODE_IN_PU_NO_IT );//mosi pin 6

    SPI_SendData(0x04);//pin 2
    while(SPI_GetFlagStatus(SPI_FLAG_TXE)== RESET);

    while (SPI_GetFlagStatus(SPI_FLAG_RXNE) == RESET);

    RxBuffer2 = SPI_ReceiveData();

    GPIO_Init(GPIOD,RxBuffer2,GPIO_MODE_OUT_PP_HIGH_SLOW);// turn on led at this address

  • Hello Shawon,
    Thank you so much for creating such an amazing tutorial on STM8 !!! , highly appreciate your efforts.
    Just wanted to add that one can also use STM Studio to watch variables in run time. This is quite a handy feature which perhaps also removes the need to use a LCD / serial debug to do the same.

    Note: I had done quite a rookie mistake by using a LCD which had the SWIM pin used as EN of the LCD, so this created a conflict. just avoid using swim pin for any other purpose other than debugging.

    A similar feature under the name quickwatch is also available under the debugging option of STVD however for some reason the values were not updating in it.
    Let me know if someone has figured this out.

  • hi shawon

    i am interfacing mpu6050 with stm8s003f3 but getting constant or garbage values everytime. can you please help me out.

  • friendly neighborhood

    I am having problem configuring timer 2 / timer 3 tick per 2us.
    No matter how i set the configuration the timer tick can never go lower than 7 microsecond.

    Need help to check which part of the code below is wrong. Or missing some important part.

    Here is my setup.

    static void CLK_Config(void)

    /* Configure the HSI prescaler to the optimal value */


    /* Configure the system clock to use HSE clock source */

    void TIM3_Config(void)
    /* Time base configuration */

    /* Clear TIM3 update flag */
    /* Enable update interrupt */

    /* In order to detect unexpected events during development,
    it is recommended to set a breakpoint on the following instruction.


  • #error clnk Debug\icard_!.lkf:1 segment .text size overflow (619)

    i am facing this error while initialize I2C. please help me

  • #error clnk Debug\icard_!.lkf:1 segment .text size overflow (619)
    The command: “clnk -m Debug\icard_!.map -l”C:\Program Files\COSMIC\FSE_Compilers\Lib” -o Debug\icard_!.sm8 Debug\icard_!.lkf ” has failed, the returned value is: 1
    exit code=1.

    i am facing this error while initialize I2C. please help me

  • Hello,

    First of all thanks a lot for this very educational series. I am trying the LCD program but can’t seem to get it to work. The LCD just won’t print anything. I have tried now 2 LCD 16×2 modules and both have same issue. Could you kindly help me with what can be causing this?

    My set up –

    My Code :

    #include “STM8S.h”
    #include “lcd.h”

    void clock_setup(void);
    void GPIO_setup(void);

    void delay_ms(long int n)
    while(n–> 0);


    void main(void)
    char txt1[] = {“MICROARENA”};
    char txt2[] = {“SShahryiar”};
    char txt3[] = {“STM8S003K”};
    char txt4[] = {“Discovery”};

    unsigned char s = 0x00;



    LCD_goto(3, 0);
    LCD_goto(3, 1);


    for(s = 0; s < 9; s++)
    LCD_goto((3 + s), 0);
    for(s = 0; s < 9; s++)
    LCD_goto((3 + s), 1);

    while (TRUE);

    void clock_setup(void)

    while(CLK_GetFlagStatus(CLK_FLAG_HSIRDY) == FALSE);



    CLK_PeripheralClockConfig(CLK_PERIPHERAL_SPI, DISABLE);
    CLK_PeripheralClockConfig(CLK_PERIPHERAL_I2C, DISABLE);
    CLK_PeripheralClockConfig(CLK_PERIPHERAL_ADC, DISABLE);
    CLK_PeripheralClockConfig(CLK_PERIPHERAL_AWU, DISABLE);
    CLK_PeripheralClockConfig(CLK_PERIPHERAL_UART1, DISABLE);
    CLK_PeripheralClockConfig(CLK_PERIPHERAL_TIMER1, DISABLE);
    CLK_PeripheralClockConfig(CLK_PERIPHERAL_TIMER2, DISABLE);
    CLK_PeripheralClockConfig(CLK_PERIPHERAL_TIMER4, DISABLE);

    void GPIO_setup(void)

    Thanks again!

  • Hello, Why you used @far @interrupt before void EXT1_interrupt(void)?

  • As u mention in your article that stm8s is used for digital panel do you have any sample code or snippet for this applicaion.please reply me.

  • Sir , can u please tell me how u select this timer value in timer input capture tutorial in stm8s series .

  • Thanks for these amazing tutorial series how can we make this code to print floating point values to make it more accurate . The time period is only printing in int value .

  • Hi, Great Tutorial!
    Do you know how to make it constant beep in a while loop instead of outside of while loop?
    I tried below code but with no luck.

    void main(void)


  • Hi Shawon!
    I’ve been studying your tutorials recently and they’ve been great.
    I didn’t have a discovery board at first so I just tried to learn how to do the coding! And that was all right.
    But now that I have bought a STM8s003f3p6 board and I’m trying to see my code run on board, I’ve encountered plenty of errors! I’d really appreciate it if you could help me! Thank you in advance.
    First of all my board doesn’t come with a bulit-in st-link programmer. So I have bought a st-link/v2 programmer to connect my stm8 board to the PC. And here is my problem:
    The st-link/v2 programmer is recognized by the PC and can be seen in the device manager. All connections from the programmer to the stm8 board are established, I mean nrst, swim, gnd and vdd. But when I try to program the board using STVP, this error pops up:
    “Cannot communicate with the device! Check the swim cable connection and check all the needed pin connections on the swim connector.”
    I have checked pin conncetion and I’ve surfed different websites but I can’t figure it out! Hope you can help me…

    • What happens why you try to read the chip?

      • You mean “what happens ((when)) you try to read the chip?”, right?
        I just checked it and the same error occurs!
        I also used IAR Embedded Workbench for STM8 just to see if makes any difference but again a similar error took place:
        “Failed to set configuration with MCU name STM8S003F3: SWIM error [30006]: comm init error: chip does not answer”
        I don’t know whether it’s because of the my PC’s drivers or some settings that I’m missing or anything else…

        • Some boards have the bug that the GND pin of connector is not connected to CPU/board ground. Please check continuity of all connector pins to CPU.

  • Hi,

    In Window Watchdog Timer tutorial , Counter diagram is look like its wrong not 0x7F it is should be 0x3F. because i have referred the same diagram from the reference manual.
    And can u please tell me the follow bit clearly ,
    when you’re not pressing the key , if condition will satisfy or not ?, because it’s down-counter and need to change the counter diagram as per reference manual.
    when you’re pressing the key, outside the window of watchdog refresh it get’s reset is my understanding is correct?

  • Hi Shawon
    I used your “stm8s_delay.c” and “stm8s_delay.h” with my other source and header files.
    But… delay is too long!!!

    What is the reason?

  • Hello i am newbie on this controller i want to interface 4 digit 7 segment display to indicate measure voltage through the ADC and i have to configure my gpio adc timer and clk . thanks!!!

  • thanks for this lovely tutorial….i am new on this controller. i have doubt,How do i configure 4 digit 7 segment display and how to read data and display on the dispaly through the adc. i have to calculate current and voltage and display on segment .
    which mode will be suitable for this conversion????

  • Rohit Kumar Sambaria

    Hi Shawon,
    First of all, thank you for this wonderful tutorial. While compiling code in STVP, I came across an unexpected error. When I deinitialize a port using
    GPIO_DeInit(GPIOx); //x=port name
    and declare a character using
    char ch;
    compiler throws error as
    The command: “cxstm8 -i..\gpio_test\inc -iinc +debug -pxp -no -l +mods0 -pp -i”C:\Program Files (x86)\COSMIC\FSE_Compilers\CXSTM8\Hstm8″ -clDebug\ -coDebug\ main.c ” has failed, the returned value is: 1
    exit code=1.

    These two pieces of code do not go together. However, when I just use one of them. There is no error. Why is that?

    Thank you

  • can anyone tell me how to use alternate function of the pin using pheriphral library?



    Can you tell me the procedure to interface Seven segment displace because in th program, I cant find any thing related to seven segment, Like how you are providing serial clock and latch input to seven segment display?

    thank you

  • Hi,
    I am new to this stm8 .

    I have a small doubt .
    my doubt is “while configuring the interrupts, why we are commented or un-commented the particular part of the code
    in the BASIC INTERRUPT VECTOR TABLE FOR STM8 devices file ”

    //@far @interrupt void NonHandledInterrupt (void)
    /* in order to detect unexpected events during development,
    it is recommended to set a breakpoint on the following instruction
    // return;

    this part you used in the above code .

    Any specific reason for this commenting this section.

    sorry for my poor English.

    Thanks in advance .

  • Great work on this document. Highly appreciated.
    I am using STM8S105K4 with PB0, PB1 PB2 and PB4 as ADC input pins. I have In my application i see when i use ADC measurement using following functions:

    I am seeing noise on PB0 pin and channel PB1, PB2 are reading 0 (even though there is significant voltage on pin) value when application is debugged. When i turn off ADC function completely noise goes away. so there is definatly some interaction on board with ADC noise. i am using HSI clk with 1Mhz frq.

  • Anantha narayanan

    Good article. I’m new to stm8. i was using stm32 till date. now I chose stm8s001j3 controller.
    I’m able to compile code & open the light programmer. but it ends up saying “error: The specified module could not be found”
    “error: Cannot load HaplSwim.dll”.
    Am i missing something with respect to swim connection? I have left swim pin connected to ground & then is connected to ST-LinkV2.
    kindly help out. Thanks.
    Anantha R

  • Good tutorial, thanks, but I have a question about the GPIO configuration of SPI MOSI. In the SPI example code of STM8S/A Standard Peripherals Firmware Library, the GPIO of SPI MOSI, MISO are not configured.

  • Digvijay Kapdi

    i use the code for my STM8S003F3P6 controller & i have changed the PIN PC2 and PC3 to Port B (due to PC2&PC3 is not available in stm8s003f3) also make changes in lcd.h &lcd.c. but while Build i found below errors. and i don’t know the meaning of error, kindly help me.

    Compiling lcd.c…
    cxstm8 +debug -pxp -no -l +mods0 -pp -i”C:\Program Files (x86)\COSMIC\FSE_Compilers\Hstm8″ -clDebug\ -coDebug\ lcd.c
    #error cpstm8 stm8s.h:2826 bad #endif
    The command: “cxstm8 +debug -pxp -no -l +mods0 -pp -i”C:\Program Files (x86)\COSMIC\FSE_Compilers\Hstm8″ -clDebug\ -coDebug\ lcd.c ” has failed, the returned value is: 1
    exit code=1.

    uv_lcd_stvd_1.elf – 3 error(s), 0 warning(s)

    so kindly give me the solution because i don’t understand why this error is appear.

  • Is there anyway to send a float to the display? Or cast a float to a string to use the LCD_putstr function that is written?

  • Yes,same configuration for both adc1 0/1 channel.

    void ADC1_setup(void)

    ADC1_CHANNEL_0, // on PB0 analog input EUT Mains voltage

    “same for channell 1″….then:

    ((ADC1_Channel_TypeDef)(ADC1_CHANNEL_0 | ADC1_CHANNEL_1)),

    thank you for the answers!

  • First of all a big thank you for the work done!

    I have a issue with ADC1 in stm8s105k4 device:for my project i have used ADC1 in scan mode (i have to measure two analog voltage),I used the code that you described in your course (Multi Channel ADC with Scan Mode).
    I have enable AIN0(on PB0) and AIN1(on PB1) but the result is that only the reading on PB0 is continuos updated,the value on PB1 is updated only one time (after reset).
    Do you have any suggestions?

  • Hi,
    I am trying to compile the Source code for SM8S, and getting error
    #error cpstm8 ..\..\stm8s_eval.h:127 “Please select first the STM8S EVAL board to be used (in stm8s_eval.h)”



  • thank you so much sir for sharing good tutorials for us. i complete all your tutorials also done my minor project in stm8s. love from india.

  • clnk -l”C:\Program Files (x86)\Common Files\Lib” -o Debug\alpha_lcd.sm8 -mDebug\ Debug\alpha_lcd.lkf
    #error clnk Debug\alpha_lcd.lkf:79 Debug\stm8_interrupt_vector.o: symbol f_NonHandledInterrupt multiply defined (Debug\stm8s_it.o)
    The command: “clnk -l”C:\Program Files (x86)\Common Files\Lib” -o Debug\alpha_lcd.sm8 -mDebug\ Debug\alpha_lcd.lkf ” has failed, the returned value is: 1
    exit code=1.

  • lcd file add file stm8s_it.c compile error

  • lcd and external interrupt compile error

  • Compiling ..\stm8s_3f3_library\src\stm8s_it.c…
    cxstm8 -i..\stm8s_3f3_library\inc +debug -pxp -no -l +mods0 -pp -i”C:\Program Files\COSMIC\FSE_Compilers\Hstm8″ -clDebug\ -coDebug\ ..\stm8s_3f3_library\src\stm8s_it.c
    this error– ” #error cgstm8:0 x() unknown space: intrrupt ”
    The command: “cxstm8 -i..\stm8s_3f3_library\inc +debug -pxp -no -l +mods0 -pp -i”C:\Program Files\COSMIC\FSE_Compilers\Hstm8″ -clDebug\ -coDebug\ ..\stm8s_3f3_library\src\stm8s_it.c ” has failed, the returned value is: 1
    exit code=1.

    intrupt.elf – 3 error(s), 0 warning(s)
    i dont know what i can do

  • Thank you so much for shering this kind of information. Sir something wrong with me after extract zip (spl) file i cannot find config.h and flash.h , please sir tell me what i can do ?

  • Thank you, Shawon and Embedded Lab for these wonderful tutorials. I’d just like to ask if you’ve added a (preferably linked) index of their titles somewhere? As far as I can tell, one has to select a blind number (above) before one can tell what subject it’s a tutorial about!

  • Thank you for the example code. What series of steps should one take in order to migrate your code to a different MCU? I have an STM8TL52F4.

  • I used scan mode example from your example files, but its not updating ADC result when i change voltage on ADC pin. It keeps showing initial value.

  • Hello Sir
    Sir i am little bit confuse about code size its ” s19 ” files is too big to controler memory
    how can we know about our code how big it
    Please Replay Me

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  • I am little confused about usage of ADC:
    I am trying to use one ADC channel PB0 for ADC interrupt
    I am trying to use another channel PB3 to measure voltage.
    How should i use ADC here?
    If i use ADC interrupt PB0 with single channel and want to use PB3 for measurement of voltage using single channel ADC,
    how processor would know which channel i am scanning?

  • Naveed Ahmed Siddiqui

    I love You Very Well this side i am very happy to work on this controller Thank again

  • Hello!
    And HUGE thanks for a one of the best documenting on “Embedded-lab Starting STM8 Microcontrollers” projects.
    I am trying making SPI demo with MAX7219- based scrolling dot-matrix display and a STM8S003k3, but there is something wrong with my debugging giving an error: “#error clnk Debug\matriisi2.lkf:1 symbol _delay_ms not defined (Debug\main.o Debug\max72xx.o )”

    I`m Not sure if I copied the MAIN.c, MAX72XX.h MAX72xx.h- files accordingly because of copy/paste function from “Code Example section”

    Please help me with the situation. THANKS!
    P.S. PC4 SPI__SS does not work for my STM8CUBEMX and PE5 shows SPI_NSS?!?!?!

    • Seems like software delay library is missing from your project….

      • Hello again and thanks for your reply!
        HMM…Obvioysly software delay library is missing, but…. I´m I totally lost trying to solve the problem by using the section “Creation & Addition of libraries” under “Some Useful Tips”? Please tell me where to find this “stm8s_delay.h”-file. Only I find is a STM8L15x “delay.h” which hardly suitable for my STM8S ?!?!?

        My workaround was to use function “void delay(unsigned int n)” I dont know if the trick is an acceptable programming practice but VOILA!!!! I can see and read the text from my Matrix-LCD.


  • Hello Shawon,

    Thanks for taking effort to put such a nice document on STM8. I would like to have multiple interrupt routines for multiple pins on PORT B. how can i declare multiple routines under PORT B. Here you are showing Port B Pin 7 routine. I would like to have Port B Pin6 also as external interrupt. How can i declare its routine seperatly like EXTI1_IRQHandle.

    • Since there is one interrupt vector for each port, you have to read needed GPIO pins of the respective port once interrupt triggers. In this way you can have multiple external interrupts on same port.

      • Thanks for your response Shawon.
        I have similar question regarding ADC usability. In my application i will be using multiple ADC pins. How can read ADC value of specific pin. I am refering to your ADC continuous conversion example.
        In that exaple you have PB0 as ADC pin and when you call ADC1_startcoversion(); it reads PB0 and you collect result at A0= ADC1_GetConversionValue();
        Now, if i have multiples ADC pin how can i get conversion value from intended pin? for e.g. PB1(AN1) and PB2(AN2)

  • Hi! I’m trying to run the Timer 1 PWM program on my Discovery Board (105C6T6 MCU). I’m testing it on all the channels of Timer 1. I get complementary PWM outputs from channel 2 on my oscilloscope. But for channel 1 and 3, only the complementary pins i.e. CH1N and CH3N pins give outputs while their counterparts only show some noise on the scope. Also channel 4 gives proper output. I’ve also tried with the code example given in the Standard Peripheral Library, but the same thing happens. What could be the reason? Please help!

  • Hi! I’m using your codes on my DISCOVERY BOARD (STM8S105C6T6 MCU) . Every time I try to debug a program on STVD it says “configuration error: detected mcu different from the selected one”. I’ve tried to change the MCU from Project settings => MCU selection, but to no avail. Please help!

  • muharrem çetinkaya

    Hi Shawon Shahryiar,

    I am sorry for my English,
    I’m using translate.

    Did you use software uart with stm8?
    can you share a example study?

  • Hi Shawon Shahryiar

    “stm8s conf.h” not there in stm library pls upload in drive and share the link for it


    Hi Shawon Shahryiar,
    I have debug time base example, but not getting any timer output. Actually i am not able to start any of timer. I have also tried with your example but same result. Am i doing anything wrong or something missing?
    Hardware : STM8S003F3

  • hi Shawon , i tried this for kit stm8s discovery with 105C6T6 and have nothing on the display of LCD . can u help me !!! tks a lot , brate !!!

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  • Hi, just wanted to ask where did you get the documentation for the SPL. The pic in your GPIO tutorial, where did you get that from ?

  • Hi sir, I’m using stvp + cosmic for almost a year. Recently as I compile there happens errors as follows: flexLM features has expired. I think my cosmic licence has expired. Thus I want to know what can I do? Can I get licence like the first time?

    • Yeah just like first time you have to reacquire a new license from Cosmic and reapply….

      • Excuse me shawon, I’m a bjt confused. I should resend the “CM8_license.txt” file to cosmic and how can I reapply the new license?should I replace it with previous license? I couldn’t find the previous license file. I don’t know where did I copy it…

        • First go to this location of your PC: “C:\Program Files (x86)\COSMIC\FSE_Compilers\CXSTM8″…. Run LmregFSE.exe file and fill in the infos…. You send them the generated info via email and they will send you a new license file…. Copy-paste and overwrite the license file they will send here: “C:\Program Files (x86)\COSMIC\FSE_Compilers\CXSTM8\License”…. Your license would then be renewed for another year…. Simple…. 🙂

          • I sent it for cosmic but the problem is that I don’t remember where I copied license.lic. It’s not in “C:\Program Files (x86)\COSMIC\FSE_Compilers\CXSTM8\License” I must overwrite the new license. how can I find previous license location?

          • It should be “C:\Program Files (x86)\COSMIC\FSE_Compilers\CXSTM8\License” if your Windows is 64-bit edition or “C:\Program Files\COSMIC\FSE_Compilers\CXSTM8\License” if your Windows is 32-bit edition….

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  • Shawon I’ve really progressed with your masterly article. I have a question; in “interupt.vector.c” you said we should comment the “@far @interrupt void nonHandledInterrupt(void)” ( in above the interrupt.vextor.c file ) but as I comment this function I got 33 errors for 33 nonHandeledInterupts… so I didn’t do that and I’ve never had an issue yet. I want to know does it make a problem? Is it necessary to comment that function??

  • Hi shawon☺ , I used an External interupt for connecting a switch to micro. The problem is that when I push the button the ISR repeated many times but I want my ISR run only a time. Can you help me please??

    • Firstly did you use pull-up and glitch removal capacitor across the switching point? Secondly, you can remove this repetitive interrupt by disabling external/global interrupt once an interrupt has been detected and reenabling external/global after processing the ISR….

      • Thanks a lot shawon. I’ve tried to achieve real time. For do that I used 11.0592 Mhz crystal and timer2 on prescaler 1024, timer period: 108. With this regulation the interupt must occurs every 1ms. But it doesn’t work probably . In other words it has 1 second difference in a minute. What’s the problem?

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  • Hi Gents,

    I’m using the IAR environment and tried to use the delay feature from these tutorials. Unfortunately I
    meet an issue with the dealay function.
    I have imported both .c & .h files to the project and tried to use the delay_ms(); but during compilation I see error like below:
    “Error[Li005]: no definition for “_asm” [referenced from D:\…\Debug\Obj\stm8s_delay.o].

    I have no idea what can be wrong, maybe I missed add some definitions, perhaps someone could explain it to me?

    Thank U in advance

  • Hey guys;
    Could you help me please, I’ve copied the Tmer Interupt(TIM4) project, but when I built it, there was an error:
    “@svlreg missing for function f_TIM4_UPD_IRQHandler”
    I just recomment the top of “interupt_vector.c” because I had 33 errors.

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  • ——- Project stm8s103 – STM8 Cosmic – Configuration Release ————-

    “on release option i encounter this error what is the solution for this
    in debugging mode i don’t have any errors please help”

    Compiling ..\..\main.c…
    cxstm8 +mods0 -pp -i”C:\Program Files\COSMIC\FSE_Compilers\Hstm8″ -clRelease\ -coRelease\ ..\..\main.c
    #error cpstm8 ..\..\main.c:29 can’t open stm8s.h
    #error cpstm8 ..\..\main.c:46(12+8) missing )
    #error cpstm8 ..\..\main.c:60(11) missing prototype
    #error cpstm8 ..\..\main.c:60(45) missing prototype
    #error cpstm8 ..\..\main.c:65(21) missing prototype
    #error cpstm8 ..\..\main.c:65(55) missing prototype
    #error cpstm8 ..\..\main.c:66(9) missing prototype
    #error cpstm8 ..\..\main.c:60(45+10) GPIO_PIN_0 undefined
    #error cpstm8 ..\..\main.c:60(12+5) GPIOA undefined
    #error cpstm8 ..\..\main.c:60(60+25) GPIO_MODE_OUT_PP_LOW_FAST undefined
    #error cpstm8 ..\..\main.c:76(11+8) missing )
    #error cpstm8 ..\..\main.c:76(26) old style argument declaration
    #error cpstm8 ..\..\main.c:79(9+6) nCount undefined
    The command: “cxstm8 +mods0 -pp -i”C:\Program Files\COSMIC\FSE_Compilers\Hstm8″ -clRelease\ -coRelease\ ..\..\main.c ” has failed, the returned value is: 1
    exit code=1.

    stm8s103.elf – 15 error(s), 0 warning(s)

    • Seems like the compiler doesn’t know the location of the source and header files…. Go to Project >> Settings…. Select Debug/Release and check the debug tab there…. Locations for the header and source files should be shown there or else you’ll get this sort of error….

      • yes, sir as per your video i did the process , but previously i use st’s standard peripheral library “template” to check GPIO ready project. in st’s standard library ” Example project” compiled in debug mode but in release mode it gives above error. then i follow your video process and error gone hex.file generated in debug and release mode too. my request is to make separate page for stm8 and explain the st’s standard peripheral library and your project list for stm8 only with separate section.Thanks.

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    I have been working through your articles and trying to understand as much as possible. I am currently looking at the AWU,

    I have brought in the project, compiled and built with no errors. 🙂

    However when running the program the CPU goes into the halt mode, and never Auto wakes up! 🙁

    Is there some more work that has to be done in the interrupt side of things? Does the project need the ITC.c and ITC.h files and some adjustments in there?

    Could I also have the delay.c and delay .h files please.


    • By the way, I am using the STM8SVL Discovery with the 003K processor on it also so all hardware is identical.

    • No, nothing needs to be done in the interrupt “itc” files but you need to add some lines in the “it” interrupt files:

      in the “it” header file add the following line:

      @far @interrupt void AWU_trigger_IRQHandler(void);

      and in the “it” source file add the following lines:

      void AWU_trigger_IRQHandler(void)

      Change the interrupt vector file as shown below:

      #include "stm8s_it.h"

      typedef void @far (*interrupt_handler_t)(void);

      struct interrupt_vector {
      unsigned char interrupt_instruction;
      interrupt_handler_t interrupt_handler;

      //@far @interrupt void NonHandledInterrupt (void)
      /* in order to detect unexpected events during development,
      it is recommended to set a breakpoint on the following instruction
      // return;

      extern void _stext(); /* startup routine */

      struct interrupt_vector const _vectab[] = {
      {0x82, (interrupt_handler_t)_stext}, /* reset */
      {0x82, NonHandledInterrupt}, /* trap */
      {0x82, NonHandledInterrupt}, /* irq0 */
      {0x82, AWU_trigger_IRQHandler}, /* irq1 */
      {0x82, NonHandledInterrupt}, /* irq2 */
      {0x82, NonHandledInterrupt}, /* irq3 */
      {0x82, NonHandledInterrupt}, /* irq4 */
      {0x82, NonHandledInterrupt}, /* irq5 */
      {0x82, NonHandledInterrupt}, /* irq6 */
      {0x82, NonHandledInterrupt}, /* irq7 */
      {0x82, NonHandledInterrupt}, /* irq8 */
      {0x82, NonHandledInterrupt}, /* irq9 */
      {0x82, NonHandledInterrupt}, /* irq10 */
      {0x82, NonHandledInterrupt}, /* irq11 */
      {0x82, NonHandledInterrupt}, /* irq12 */
      {0x82, NonHandledInterrupt}, /* irq13 */
      {0x82, NonHandledInterrupt}, /* irq14 */
      {0x82, NonHandledInterrupt}, /* irq15 */
      {0x82, NonHandledInterrupt}, /* irq16 */
      {0x82, NonHandledInterrupt}, /* irq17 */
      {0x82, NonHandledInterrupt}, /* irq18 */
      {0x82, NonHandledInterrupt}, /* irq19 */
      {0x82, NonHandledInterrupt}, /* irq20 */
      {0x82, NonHandledInterrupt}, /* irq21 */
      {0x82, NonHandledInterrupt}, /* irq22 */
      {0x82, NonHandledInterrupt}, /* irq23 */
      {0x82, NonHandledInterrupt}, /* irq24 */
      {0x82, NonHandledInterrupt}, /* irq25 */
      {0x82, NonHandledInterrupt}, /* irq26 */
      {0x82, NonHandledInterrupt}, /* irq27 */
      {0x82, NonHandledInterrupt}, /* irq28 */
      {0x82, NonHandledInterrupt}, /* irq29 */

      Sorry for the trouble…. I probably forgot to state these in the code and explanation segments…. Will be updating the post…. Thanks for this catch…. 🙂

  • Hey,
    Grateful for the tutorial! Nice work.
    I tried this section of your tutorial and got 33 errors after building:
    it was due to commenting of :

    @far @interrupt_handler_t void NonHandledInterrupt (void)

    because these were used in the interrupt vector struct again. I uncommented those lines and got one error:
    “unknown space: interrupt_handler_t”

    what should i do now?
    please help me!
    Thanks alot.

  • Hi,
    Firstly, thanks alot for your tutorials. It helps alot for beginners in STM8S because there are not much documentation for it.
    Secondly, I have been trying to implement the Timer interrupt tutorial(pg. 19) and wrote the code as instructed, however I am getting this error of “invalid pointer initializer” when I added the interrupt
    {0x82, (interrupt_handler_t)TIM2_IRQHandler}, /* irq13 */

    in the interrupt_vector.c file as was instructed in your tutorial. Can you please help me around this issue? What am I doing wrong here? Any suggestions would be of great help.

  • Hi

    Thank you for the post,
    I ve used your code for another sensor and noticed that in the i2c read routine you’ve forgot to send a stop to release the clock line. Modification is as follows



    unsigned int BH1750_read_word(void)
    unsigned long value = 0x0000;
    unsigned char num_of_bytes = 0x02;
    unsigned char bytes[2] = {0x00, 0x00};



    I2C_Send7bitAddress(BH1750_addr, I2C_DIRECTION_RX);

    if(num_of_bytes == 0)

    bytes[(num_of_bytes – 1)] = I2C_ReceiveData();

    /// the following line should be added



  • Hello Sir,
    I am trying to compile the code of led blink. It gives me error like this

    Compiling main.c…
    cxstm8 -i”..\..\..\..\users\rajes\documents\sisai technologies\software\stm8s lib\stm8s_stdperiph_lib\stm8s_stdperiph_lib\libraries\stm8s_stdperiph_driver\inc” -i”..\..\..\..\users\rajes\documents\sisai technologies\software\stm8s lib\stm8s_stdperiph_lib\stm8s_stdperiph_lib\project\stm8s_stdperiph_examples\adc2\adc2_continuousconversion” +debug -pxp -no -l +mods0 -pp -i”C:\Program Files (x86)\COSMIC\Hstm8″ -clDebug\ -coDebug\ main.c
    #error cpstm8 ..\..\..\..\users\rajes\documents\sisai technologies\software\stm8s lib\stm8s_stdperiph_lib\stm8s_stdperiph_lib\libraries\stm8s_stdperiph_driver\inc\stm8s_uart1.h:106(13) missing enumeration member
    #error cpstm8 ..\..\..\..\users\rajes\documents\sisai technologies\software\stm8s lib\stm8s_stdperiph_lib\stm8s_stdperiph_lib\libraries\stm8s_stdperiph_driver\inc\stm8s_uart1.h:113(13) missing enumeration member
    The command: “cxstm8 -i”..\..\..\..\users\rajes\documents\sisai technologies\software\stm8s lib\stm8s_stdperiph_lib\stm8s_stdperiph_lib\libraries\stm8s_stdperiph_driver\inc” -i”..\..\..\..\users\rajes\documents\sisai technologies\software\stm8s lib\stm8s_stdperiph_lib\stm8s_stdperiph_lib\project\stm8s_stdperiph_examples\adc2\adc2_continuousconversion” +debug -pxp -no -l +mods0 -pp -i”C:\Program Files (x86)\COSMIC\Hstm8″ -clDebug\ -coDebug\ main.c ” has failed, the returned value is: 1
    exit code=1.

    • Can you help me?

      • Why are you adding ADC2 header and source files? Are you not using STM8S003?

        • stm8s_conf.h this file i am added from ADC2

          • Add only the hardware files that your target chips supports…. For example, you cannot add ADC2 for STM8S003…. This is so as STM8S003 doesn’t have these hardware blocks…. Likewise if you are using STM8S207, you cannot add UART2 files for the same reason…. If you don’t add required files then you will get errors…. You’ll also get errors if you add files that are not applicable for your target MCU….

  • Hi
    I am using stm8s003f3 pin out board and with this code I am just testing output at micro controller pin 2 i.e. TX
    I am testing this using an oscilloscope.
    but not able to get any output
    Can you please help?


  • SSI_Electronics

    I have followed the code as per the explanation.
    but I’m getting garbage values on serial port.
    Can you suggest any debugging steps??
    Thanks in advanced.

    PS: Great tutorial. It’s helping me a lot.

    • 1. Check wiring for loose connections….
      2. Use a stable and noise-free power source like a battery-bank to power up the board…. Noise from PC port may cause unwanted issues….
      3. Use CP2102 or FT232-based USB-TTL converter…. Don’t use PL2303-based ones because most are clones or fakes….
      4. Use a short USB cable….
      5. Use external pull-up resistors for both TX and RX pins….
      6. Try with another board if these don’t solve the issue…. It should not behave as you are saying because the code has no issues….

  • santosh kharade

    Serial receiving program is not working

  • Hello sir
    Do you tell me how generate pwm in pin no. B5 & B5
    in Stm8 board

    • Which STM8 chip? Because different chips have different pin mapping and sometimes there are alternative pins for such purposes…. Check with STM8CubeMX if that pin is available for that purpose….

  • Santosh Kharade

    i have done code for multi channel adc but its not working ????
    when i use single channel adc its working properly…………

  • Hello guys
    here i’m again for ask your help. I wrote a very easy program but when i try to send to stm8 the light programmer give me this error :

    >Erase not feasible
    Error: Device not recognized !

    some idea ?
    Thank you

  • First thank you so much for this wonderful tutorial, i’m new with STM8 i follow all you steps but i still have a problem and here i’m please can you help me this is the error message.
    Thank you

    ———– Project test_prov – STM8 Cosmic – Configuration Debug ————-

    Compiling main.c…
    cxstm8 -i..\..\en.stsw-stm8069\stm8s_stdperiph_lib\project\stm8s_stdperiph_template -igpio -iinc +debug -pxp -no -l +mods0 -pp -i”C:\Program Files (x86)\COSMIC\FSE_Compilers\CXSTM8\Hstm8″ -clDebug\ -coDebug\ main.c
    #error cpstm8 gpio\inc\stm8s.h:74 “Please select first the target STM8S/A device used in your application (in stm8s.h file)”
    The command: “cxstm8 -i..\..\en.stsw-stm8069\stm8s_stdperiph_lib\project\stm8s_stdperiph_template -igpio -iinc +debug -pxp -no -l +mods0 -pp -i”C:\Program Files (x86)\COSMIC\FSE_Compilers\CXSTM8\Hstm8″ -clDebug\ -coDebug\ main.c ” has failed, the returned value is: 1
    exit code=1.

    test_prov.elf – 2 error(s), 0 warning(s)

  • Hi Shawon ,
    Excellent article on stms8.
    within 3 days i was able to understand STMS8 very clearly.
    can you send me delay library files please.
    i tried to create my own without any success.
    warm regards

  • hi sir now also getting problem in compilation time …..’

    so plz can u send me the soft copy of software wat properly working at u…??

    my emain id…

    • I’m using the same software you are using – the latest one out there…. and so someone sending it has no meaning…. I suggest that you uninstall it and give it fresh retry, following all the steps carefully…. No one can help you with licensing issue unless to do it correctly….

  • hi geting poroblem while click on programmer ten my softare automatically close tab

  • hi sir…

    i getting problem for license configured……………. at compile time getting error like that…………. plz help out

    #error cpstm8 C:\Program Files (x86)\COSMIC\FSE_Compilers\CXSTM8\HSTM8\mods0.h:1 FlexLM Cannot find license file.
    The command: “cxstm8 -iinc +debug -pxp -no -l +mods0 -pp -i”C:\Program Files (x86)\COSMIC\FSE_Compilers\Hstm8″ -clDebug\ -coDebug\ main.c ” has failed, the returned value is: 1
    exit code=1.

    alpha_lcd.elf – 3 error(s), 0 warning(s)

  • helo…we hav stm8svl discovery..i need embedded c program for the glowing of led,connecting ir receiver and also powersupply…for connecting these things i need code can u please guide me

  • Thanks for this article..
    I am looking for microsd card interface with STM8s discovery board. can you please provide the tutorial for microsd card?

  • In relation to disabling unused peripheral clocks as suggested by you:

    I found the following list of peripherals in the STM8S105 Discovery Board: Advanced control timer (TIM1), General-purpose timers (TIM2 and TIM3), Basic timer (TIM4), SPI, I2C, UART2, Window WDG, Independent WDG, ADC1,
    AWU timer, Beeper.

    Is this all?

    I could not find the clock peripheral configuration function for Window WDG, Independent WDG, Beeper in the Standard Peripheral Library.
    Is it not required?

    P.S. I am new to MCU programming with a little experience on Arduino. So please forgive me if the question is foolish.

    • 1. STM8S003K3 Discovery – the one I use for the blog is different from STM8S105…. They have different peripherals and so there will be differences in peripheral clocks…. Please check the device datasheet/STM8CubeMX for available hardware….

      2. WWDG and IWDG are set in option bytes and they don’t use peripheral/CPU clock…. Their oscillator is separate…. Due to these they don’t have clock configurations like other peripherals….

      P.S: No question is a noob question…. every question is allowed no matter how silly it may look….

  • Hi please someone tel me where can i find stm8s_delay.h and stm8s_delay.c

  • Hi , please someone tel me . Where can i find stm8s_delay.h and stm8s_delay.c
    Thanks ..

  • i am using stms003f3p6 controller..i have done as u told exactly but tim1 input capture is not displaying any value …according to your article it should display 10…i dont have any errors everything is fine…pulse on tim2 is ok is coming as u said…but capture not working..please help me …thank you…

  • Hi Sir,
    i have just follwed your instruction provied in yout tutorial in main.c

    #include “stm8s.h”

    while (1);

    This error comes, can you please check why this error come, i am new and learn the controller programming.

    The command: “cxstm8 -i”d:\other datasheet\new folder\lib\stm8s_stdperiph_lib\libraries\stm8s_stdperiph_driver\inc” +debug -pxp -no -l +mods0 -pp -i”C:\Program Files (x86)\COSMIC\FSE_Compilers\CXSTM8\Hstm8″ -clDebug\ -coDebug\ main.c ” has failed, the returned value is: 1
    exit code=1.

    main.o – 2 error(s), 0 warning(s)


  • Hi there, i solve the previous ADC problem. Anyway, u make some good tutorial on stm8 chips. Nice work

    • What was causing that issue? How did you solve it?

      • because i put all these

        ADC_SamplingTimeConfig(ADC1, ADC_Group_SlowChannels, ADC_SamplingTime_4Cycles);
        ADC_SchmittTriggerConfig(ADC1, ADC_Channel_7, DISABLE);
        ADC_ChannelCmd(ADC1, ADC_Channel_7, ENABLE);
        ADC_Init(ADC1, ADC_ConversionMode_Continuous, ADC_Resolution_12Bit, ADC_Prescaler_1);
        ADC_Cmd(ADC1, ENABLE);
        ADC_ExternalTrigConfig(ADC1, ADC_ExtEventSelection_None, ADC_ExtTRGSensitivity_All);

        in ‘while(1)’. It keeps looping.

        Once i put it before ‘while (1)’, it becomes normal.

  • Hi there, thanks for sharing. I learn alot thru your example, but I have encounter a problem with adc. Im currently using stm8l151k4t6. I wanna use the pin D7 as to read the voltage from my battery and monitor it (display on LCD). Can u please check where it goes wrong on my code?

    ADC_SamplingTimeConfig(ADC1, ADC_Group_SlowChannels, ADC_SamplingTime_4Cycles);
    ADC_SchmittTriggerConfig(ADC1, ADC_Channel_7, DISABLE);
    ADC_ChannelCmd(ADC1, ADC_Channel_7, ENABLE);
    ADC_Init(ADC1, ADC_ConversionMode_Continuous, ADC_Resolution_12Bit, ADC_Prescaler_1);
    ADC_Cmd(ADC1, ENABLE);
    ADC_ExternalTrigConfig(ADC1, ADC_ExtEventSelection_None, ADC_ExtTRGSensitivity_All);
    while(!ADC_GetFlagStatus(ADC1, ADC_FLAG_EOC));
    battery = ADC_GetConversionValue(ADC1);

  • hi shawon great tutorials it would be nice too if you covered the coide compiler for arm it’s a good free compiler

  • hi shawon thanks for your response and support it turns out that my problem was a license issue I stupidly thought i use one license on multiple pc’s I used the license for a particular computer for mine that’s why I’ve been having compilation issues you have to use the license file stm8 sends you that is generated by your own pc else it won’t compile it’ll jus kip throwing you errors

  • It seems that you didn’t follow my instructions completely…. I found some issues:

    1. You have included header and source files of ADC2, CAN, UART2, etc which are unavailable in STM8S103…. Add only files for the peripherals available in your target MCU…. Exclude the rest….

    2. You have not included stm8s_delay header and source files…. Either disable it from stm8s_conf.h header file if you are not going to use it or add both the header and the source files for it in your project….

    Resolve these and you are good to go….


  • I haven’t compiled any of the examples yet I just tried to compile the main source file just for test purpose n it just keeps showing me the same errors

  • yes the comic compiler was installed properly i even received a license file from my mail with the instructions to copy the license file to the license folder in the install directory if you fail to do this it will keep popping up for you to put in the license file. iincluded all the source files and header files as instructed i am working with the cheap stm8s103f i uncommented the stm8s103f in the stm8.h header file as you instructed and just to compile the main file it just throws me errors

  • no I just followed your instructions I just compiled it after setup i did not write any code yet just compiled the default main file

    • Need more details….

      1. The version of STVD and Cosmic
      2. Which example is giving this issue?
      3. The chip you are using if it other than STM8S003
      4. Have you tried to compile something else other than my examples?
      5. Are the paths to libraries and other folders properly added?
      6. Is the Cosmic compiler registered properly?

  • it throws this line The command: “cxstm8 -iinc +debug -pxp -no -l +mods0 -pp -i”C:\Program Files (x86)\COSMIC\FSE_Compilers\Hstm8″ -clDebug\ -coDebug\ main.c ” has failed, the returned value is: 1
    exit code=1.

  • hi I’m having compilation issues when I compile it just throws me error about comic compiler located in the program file ialso excluded unwanted header files but my problems still weren’t solved

  • hi thanks for the tutorials but i am having compiler error issues even when I remove unnecessary header files it say comic compiler error

  • I am new to STM8S003k3 Discovery board.I have done UART communication using STM standard peripheral library example. Now I want to define any other GPIO pin for UART communication. Is it possible to use d0 and d1 pin for the UART communication? If yes, then please let me know how?

  • thank you very much for this article!

  • Thank you for your time and effort.

  • Good job bro

  • Thank you for this exceptionally comprehensive article, much appreciated


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