Starting STM8 Microcontrollers

STM8S003K3 Discovery

Time Base Generation (TIM2)

Time base generation is the most basic property of any timer and is also the most needed requirement in embedded systems. This mode can be used with or without interrupt. We’ll first check the method firstly without interrupt and then with interrupt.

With time base generation, we can accurately time stuffs and events that are more precise than using delays, loops or other methods. Time base generation utilizes hardware timers and so work independently from other processes. It has many uses. For instance, with it we can avoid software delays, generate time slots of a Real-Time Operating System (RTOS) and many other tasks.

Time-Base Unit

The time base unit for all timers of STM8 is all same. There are a few differences. For example, Timer 1 (TIM1) has a repetition counter. It is like a counter within another counter. Other timers lack this part. All timers can count up while advance timers can count down too.

The basic theory of time base generation is you have a peripheral clock which you would like to scale according to your need. Thus, you prescale it and use the new clock to run a counter. The counter will tick, incrementing count as time flies. It is just like counting from 0 to 100 and repeating from 0 again after reaching 100. Shown below is the generalized formula for finding an important event called timer reload:

Formula for TIM base

This is the amount of time that will pass before timer overflow event occurs and the timer restarts from its initial count.

In my example, the peripheral or master clock is set to 2MHz. Thus, to make timer 2 (TIM2) reload after roughly 2 seconds, I have to prescale it by a factor of 2048 and load it with 1952 counts. Note that TIM2 doesn’t have a repetition counter and so it is set to 1.

Hardware Connection



Code Example

In this example, Disco board’s user LED is turned-on and off without using any software delay. TIM2 is used to create time delay as such that the code is not stuck in a time-wasting loop.

#include "STM8S.h"
void clock_setup(void);
void GPIO_setup(void);
void TIM2_setup(void);
void main(void)
          if(TIM2_GetCounter() > 976)
               GPIO_WriteHigh(GPIOD, GPIO_PIN_0);
               GPIO_WriteLow(GPIOD, GPIO_PIN_0);
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, ENABLE);
    CLK_PeripheralClockConfig(CLK_PERIPHERAL_TIMER4, DISABLE);
void GPIO_setup(void)
void TIM2_setup(void)
    TIM2_TimeBaseInit(TIM2_PRESCALER_2048, 1952);



Firstly, the CPU and the peripheral clock are both set at 2 MHz.


As explained earlier, to get 2 second timer reload interval we need to prescale the timer by 2048 and load its counter with 1952. This is what should be the setup for TIM2:

void TIM2_setup(void)
     TIM2_TimeBaseInit(TIM2_PRESCALER_2048, 1952);

Our goal is to keep the LED on for 1 second and off for 1 second. It takes 1952 TIM2 counts for 2 second interval and so one second passes when this count is 976. Thus, in the main loop we are checking the value of TIM2’s counter. From 0 to 976 counts, the LED is on and from 977 to 1952 counts, the LED is off. Note that the LED’s positive end is connected to VDD and so it will turn on only PD0 is low.

if(TIM2_GetCounter() > 976)
     GPIO_WriteHigh(GPIOD, GPIO_PIN_0);
     GPIO_WriteLow(GPIOD, GPIO_PIN_0);

Related Posts


  • 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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