{"id":14060,"date":"2018-01-13T23:54:28","date_gmt":"2018-01-14T04:54:28","guid":{"rendered":"http:\/\/embedded-lab.com\/blog\/?p=14060"},"modified":"2023-09-06T03:00:49","modified_gmt":"2023-09-06T07:00:49","slug":"stm8-microcontrollers-final-chapters","status":"publish","type":"post","link":"https:\/\/embedded-lab.com\/blog\/stm8-microcontrollers-final-chapters\/","title":{"rendered":"STM8 Microcontrollers – the Final Chapters"},"content":{"rendered":"

This post is the sequel of the posts on STM8 microcontrollers\u00a0here<\/a>\u00a0and here<\/a>.<\/p>\n

\"Hardware\"<\/a><\/p>\n

<\/p>\n

Software I2C \u2013 DS1307<\/h2>\n

Software-based I2C is not a big requirement in case of STM8s because STM8 chips have hardware I2C blocks. However, for some reason if we are unable to use hardware I2C blocks, we can implement software-based I2C by bit-banging ordinary GPIOs. I2C protocol is itself slow compared to SPI and other protocols and so implementing software-based I2C will not significantly affect communication speed and overall throughput in most applications. However, extra coding is required and this in turn adds some coding and resource overheads.<\/p>\n

Hardware Connection<\/h4>\n

\"sw_i2c\"<\/a><\/p>\n

Code Example<\/h4>\n

<\/h4>\n

SW_I2C.h<\/u><\/em><\/strong><\/p>\n

#include<\/strong> \"STM8S.h\"<\/span><\/em><\/pre>\n
<\/pre>\n
<\/pre>\n
#define<\/strong> SW_I2C_port<\/strong>\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 GPIOD<\/span><\/em><\/pre>\n
<\/pre>\n
#define<\/strong> SDA_pin<\/strong>\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 GPIO_PIN_6<\/span><\/em><\/pre>\n
#define<\/strong> SCL_pin<\/strong>\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 GPIO_PIN_7<\/span><\/em><\/pre>\n
<\/pre>\n
#define<\/strong> SW_I2C_OUT<\/strong>()\u00a0\u00a0\u00a0 \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 do<\/strong>{GPIO_DeInit(SW_I2C_port); GPIO_Init(SW_I2C_port, SDA_pin, GPIO_MODE_OUT_PP_LOW_FAST); GPIO_Init(SW_I2C_port, SCL_pin, GPIO_MODE_OUT_PP_LOW_FAST);}while<\/strong>(0)<\/span><\/em><\/pre>\n
<\/pre>\n
#define<\/strong> SW_I2C_IN<\/strong>()\u00a0\u00a0\u00a0\u00a0 \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 do<\/strong>{GPIO_DeInit(SW_I2C_port); GPIO_Init(SW_I2C_port, SDA_pin, GPIO_MODE_IN_FL_NO_IT); GPIO_Init(SW_I2C_port, SCL_pin, GPIO_MODE_OUT_PP_LOW_FAST);}while<\/strong>(0)<\/span><\/em><\/pre>\n
<\/pre>\n
#define<\/strong> SDA_HIGH<\/strong>()\u00a0\u00a0\u00a0\u00a0\u00a0 \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 GPIO_WriteHigh(SW_I2C_port, SDA_pin)<\/span><\/em><\/pre>\n
#define<\/strong> SDA_LOW<\/strong>()\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 GPIO_WriteLow(SW_I2C_port, SDA_pin)<\/span><\/em><\/pre>\n
#define<\/strong> SCL_HIGH<\/strong>()\u00a0\u00a0\u00a0\u00a0\u00a0 \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 GPIO_WriteHigh(SW_I2C_port, SCL_pin)<\/span><\/em><\/pre>\n
#define<\/strong> SCL_LOW<\/strong>()\u00a0\u00a0\u00a0\u00a0\u00a0 \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 GPIO_WriteLow(SW_I2C_port, SCL_pin)<\/span><\/em><\/pre>\n
<\/pre>\n
#define<\/strong> SDA_IN<\/strong>()\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 GPIO_ReadInputPin(SW_I2C_port, SDA_pin)<\/span><\/em><\/pre>\n
<\/pre>\n
#define<\/strong> I2C_ACK<\/strong>\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 0xFF<\/span><\/em><\/pre>\n
#define<\/strong> I2C_NACK<\/strong>\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 0x00<\/span><\/em><\/pre>\n
<\/pre>\n
#define<\/strong> I2C_timeout<\/strong>\u00a0\u00a0\u00a0\u00a0 \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 1000<\/span><\/em><\/pre>\n
<\/pre>\n
<\/pre>\n
void<\/strong> SW_I2C_init<\/strong>(void<\/strong>);<\/span><\/em><\/pre>\n
void<\/strong> SW_I2C_start<\/strong>(void<\/strong>);<\/span><\/em><\/pre>\n
void<\/strong> SW_I2C_stop<\/strong>(void<\/strong>);<\/span><\/em><\/pre>\n
unsigned<\/strong> char<\/strong> SW_I2C_read<\/strong>(unsigned<\/strong> char<\/strong> ack);<\/span><\/em><\/pre>\n
void<\/strong> SW_I2C_write<\/strong>(unsigned<\/strong> char<\/strong> value);<\/span><\/em><\/pre>\n
void<\/strong> SW_I2C_ACK_NACK<\/strong>(unsigned<\/strong> char<\/strong> mode);<\/span><\/em><\/pre>\n
unsigned<\/strong> char<\/strong> SW_I2C_wait_ACK<\/strong>(void<\/strong>);<\/span><\/em><\/pre>\n
SW_I2C.c<\/u><\/em><\/strong><\/p>\n
#include<\/strong> \"SW_I2C.h\"<\/span><\/em><\/pre>\n
<\/pre>\n
<\/pre>\n
void<\/strong> SW_I2C_init<\/strong>(void<\/strong>)<\/span><\/em><\/pre>\n
{<\/span><\/em><\/pre>\n
\u00a0\u00a0\u00a0 SW_I2C_OUT<\/strong>();<\/span><\/em><\/pre>\n
\u00a0\u00a0\u00a0 delay_ms<\/strong>(10);<\/span><\/em><\/pre>\n
\u00a0\u00a0\u00a0 SDA_HIGH<\/strong>();<\/span><\/em><\/pre>\n
\u00a0\u00a0\u00a0 SCL_HIGH<\/strong>();<\/span><\/em><\/pre>\n
}<\/span><\/em><\/pre>\n
<\/pre>\n
<\/pre>\n
void<\/strong> SW_I2C_start<\/strong>(void<\/strong>)<\/span><\/em><\/pre>\n
{<\/span><\/em><\/pre>\n
\u00a0\u00a0\u00a0 SW_I2C_OUT<\/strong>();<\/span><\/em><\/pre>\n
\u00a0\u00a0\u00a0 SDA_HIGH<\/strong>();<\/span><\/em><\/pre>\n
\u00a0\u00a0\u00a0 SCL_HIGH<\/strong>();<\/span><\/em><\/pre>\n
\u00a0\u00a0\u00a0 delay_us<\/strong>(40);<\/span><\/em><\/pre>\n
\u00a0\u00a0\u00a0 SDA_LOW<\/strong>();<\/span><\/em><\/pre>\n
\u00a0\u00a0\u00a0 delay_us<\/strong>(40);<\/span><\/em><\/pre>\n
\u00a0\u00a0\u00a0 SCL_LOW<\/strong>();<\/span><\/em><\/pre>\n
}<\/span><\/em><\/pre>\n
<\/pre>\n
<\/pre>\n
void<\/strong> SW_I2C_stop<\/strong>(void<\/strong>)<\/span><\/em><\/pre>\n
{<\/span><\/em><\/pre>\n
\u00a0\u00a0\u00a0 SW_I2C_OUT<\/strong>();<\/span><\/em><\/pre>\n
\u00a0\u00a0\u00a0 SDA_LOW<\/strong>();<\/span><\/em><\/pre>\n
\u00a0\u00a0\u00a0 SCL_LOW<\/strong>();<\/span><\/em><\/pre>\n
\u00a0\u00a0\u00a0 delay_us<\/strong>(40);<\/span><\/em><\/pre>\n
\u00a0\u00a0\u00a0 SDA_HIGH<\/strong>();<\/span><\/em><\/pre>\n
\u00a0\u00a0\u00a0 SCL_HIGH<\/strong>();<\/span><\/em><\/pre>\n
\u00a0\u00a0\u00a0 delay_us<\/strong>(40);<\/span><\/em><\/pre>\n
}<\/span><\/em><\/pre>\n
<\/pre>\n
<\/pre>\n
unsigned<\/strong> char<\/strong> SW_I2C_read<\/strong>(unsigned<\/strong> char<\/strong> ack)<\/span><\/em><\/pre>\n
{<\/span><\/em><\/pre>\n
\u00a0\u00a0\u00a0 unsigned<\/strong> char<\/strong> i = 0x08;<\/span><\/em><\/pre>\n
\u00a0\u00a0\u00a0 unsigned<\/strong> char<\/strong> j = 0x00;<\/span><\/em><\/pre>\n
<\/pre>\n
\u00a0\u00a0\u00a0 SW_I2C_IN<\/strong>();<\/span><\/em><\/pre>\n
<\/pre>\n
\u00a0\u00a0\u00a0 while<\/strong>(i > 0x00)<\/span><\/em><\/pre>\n
\u00a0\u00a0\u00a0 {<\/span><\/em><\/pre>\n
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 SCL_LOW<\/strong>();<\/span><\/em><\/pre>\n
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 delay_us<\/strong>(20);<\/span><\/em><\/pre>\n
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 SCL_HIGH<\/strong>();<\/span><\/em><\/pre>\n
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 delay_us<\/strong>(20);<\/span><\/em><\/pre>\n
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 j <<= 1;<\/span><\/em><\/pre>\n
<\/pre>\n
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 if<\/strong>(SDA_IN<\/strong>() != 0x00)<\/span><\/em><\/pre>\n
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 {<\/span><\/em><\/pre>\n
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 j++;<\/span><\/em><\/pre>\n
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 }<\/span><\/em><\/pre>\n
<\/pre>\n
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 delay_us<\/strong>(10);<\/span><\/em><\/pre>\n
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 i--;<\/span><\/em><\/pre>\n
\u00a0\u00a0\u00a0 };<\/span><\/em><\/pre>\n
<\/pre>\n
\u00a0\u00a0\u00a0 switch<\/strong>(ack)<\/span><\/em><\/pre>\n
\u00a0\u00a0\u00a0 {<\/span><\/em><\/pre>\n
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 case<\/strong> I2C_ACK:<\/span><\/em><\/pre>\n
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 {<\/span><\/em><\/pre>\n
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 SW_I2C_ACK_NACK<\/strong>(I2C_ACK);;<\/span><\/em><\/pre>\n
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 break<\/strong>;<\/span><\/em><\/pre>\n
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 }<\/span><\/em><\/pre>\n
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 default<\/strong>:<\/span><\/em><\/pre>\n
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 {<\/span><\/em><\/pre>\n
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 SW_I2C_ACK_NACK<\/strong>(I2C_NACK);;<\/span><\/em><\/pre>\n
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 break<\/strong>;<\/span><\/em><\/pre>\n
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 }<\/span><\/em><\/pre>\n
\u00a0\u00a0\u00a0 }<\/span><\/em><\/pre>\n
<\/pre>\n
\u00a0\u00a0\u00a0 return<\/strong> j;<\/span><\/em><\/pre>\n
}<\/span><\/em><\/pre>\n
<\/pre>\n
<\/pre>\n
void<\/strong> SW_I2C_write<\/strong>(unsigned<\/strong> char<\/strong> value)<\/span><\/em><\/pre>\n
{<\/span><\/em><\/pre>\n
\u00a0\u00a0 \u00a0unsigned<\/strong> char<\/strong> i = 0x08;<\/span><\/em><\/pre>\n
<\/pre>\n
\u00a0\u00a0\u00a0 SW_I2C_OUT<\/strong>();<\/span><\/em><\/pre>\n
\u00a0\u00a0\u00a0 SCL_LOW<\/strong>();<\/span><\/em><\/pre>\n
<\/pre>\n
\u00a0\u00a0\u00a0 while<\/strong>(i > 0x00)<\/span><\/em><\/pre>\n
\u00a0\u00a0\u00a0 {<\/span><\/em><\/pre>\n
<\/pre>\n
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 if<\/strong>(((value & 0x80) >> 0x07) != 0x00)<\/span><\/em><\/pre>\n
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 {<\/span><\/em><\/pre>\n
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 SDA_HIGH<\/strong>();<\/span><\/em><\/pre>\n
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 }<\/span><\/em><\/pre>\n
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 else<\/strong><\/span><\/em><\/pre>\n
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 {<\/span><\/em><\/pre>\n
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 SDA_LOW<\/strong>();<\/span><\/em><\/pre>\n
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 }<\/span><\/em><\/pre>\n
<\/pre>\n
<\/pre>\n
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 value <<= 1;<\/span><\/em><\/pre>\n
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 delay_us<\/strong>(20);<\/span><\/em><\/pre>\n
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 SCL_HIGH<\/strong>();<\/span><\/em><\/pre>\n
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 delay_us<\/strong>(20);<\/span><\/em><\/pre>\n
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 SCL_LOW<\/strong>();<\/span><\/em><\/pre>\n
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 delay_us<\/strong>(20);<\/span><\/em><\/pre>\n
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 i--;<\/span><\/em><\/pre>\n
\u00a0\u00a0\u00a0 };<\/span><\/em><\/pre>\n
}<\/span><\/em><\/pre>\n
<\/pre>\n
<\/pre>\n
void<\/strong> SW_I2C_ACK_NACK<\/strong>(unsigned<\/strong> char<\/strong> mode)<\/span><\/em><\/pre>\n
{<\/span><\/em><\/pre>\n
\u00a0\u00a0\u00a0 SCL_LOW<\/strong>();<\/span><\/em><\/pre>\n
\u00a0\u00a0\u00a0 SW_I2C_OUT<\/strong>();<\/span><\/em><\/pre>\n
<\/pre>\n
\u00a0\u00a0\u00a0 switch<\/strong>(mode)<\/span><\/em><\/pre>\n
\u00a0\u00a0\u00a0 {<\/span><\/em><\/pre>\n
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 case<\/strong> I2C_ACK:<\/span><\/em><\/pre>\n
\u00a0\u00a0\u00a0\u00a0\u00a0 \u00a0\u00a0{<\/span><\/em><\/pre>\n
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 SDA_LOW<\/strong>();<\/span><\/em><\/pre>\n
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 break<\/strong>;<\/span><\/em><\/pre>\n
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 }<\/span><\/em><\/pre>\n
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 default<\/strong>:<\/span><\/em><\/pre>\n
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 {<\/span><\/em><\/pre>\n
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 SDA_HIGH<\/strong>();<\/span><\/em><\/pre>\n
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 break<\/strong>;<\/span><\/em><\/pre>\n
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 }<\/span><\/em><\/pre>\n
\u00a0\u00a0\u00a0 }<\/span><\/em><\/pre>\n
<\/pre>\n
\u00a0\u00a0\u00a0 delay_us<\/strong>(20);<\/span><\/em><\/pre>\n
\u00a0\u00a0\u00a0 SCL_HIGH<\/strong>();<\/span><\/em><\/pre>\n
\u00a0\u00a0\u00a0 delay_us<\/strong>(20);<\/span><\/em><\/pre>\n
\u00a0\u00a0\u00a0 SCL_LOW<\/strong>();<\/span><\/em><\/pre>\n
}<\/span><\/em><\/pre>\n
<\/pre>\n
<\/pre>\n
unsigned<\/strong> char<\/strong> SW_I2C_wait_ACK<\/strong>(void<\/strong>)<\/span><\/em><\/pre>\n
{<\/span><\/em><\/pre>\n
\u00a0\u00a0\u00a0 signed<\/strong> int<\/strong> timeout = 0x0000;<\/span><\/em><\/pre>\n
<\/pre>\n
\u00a0\u00a0\u00a0 SW_I2C_IN<\/strong>();<\/span><\/em><\/pre>\n
<\/pre>\n
\u00a0\u00a0\u00a0 SDA_HIGH<\/strong>();<\/span><\/em><\/pre>\n
\u00a0\u00a0\u00a0 delay_us<\/strong>(10);<\/span><\/em><\/pre>\n
\u00a0\u00a0\u00a0 SCL_HIGH<\/strong>();<\/span><\/em><\/pre>\n
\u00a0\u00a0\u00a0 delay_us<\/strong>(10);<\/span><\/em><\/pre>\n
<\/pre>\n
\u00a0\u00a0\u00a0 while<\/strong>(SDA_IN<\/strong>() != 0x00)<\/span><\/em><\/pre>\n
\u00a0\u00a0\u00a0 {<\/span><\/em><\/pre>\n
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 timeout++;<\/span><\/em><\/pre>\n
<\/pre>\n
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 if<\/strong>(timeout > I2C_timeout)<\/span><\/em><\/pre>\n
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 {<\/span><\/em><\/pre>\n
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 SW_I2C_stop<\/strong>();<\/span><\/em><\/pre>\n
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 return<\/strong> 1;<\/span><\/em><\/pre>\n
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 }<\/span><\/em><\/pre>\n
\u00a0\u00a0\u00a0 };<\/span><\/em><\/pre>\n
<\/pre>\n
\u00a0\u00a0\u00a0 SCL_LOW<\/strong>();<\/span><\/em><\/pre>\n
<\/pre>\n
\u00a0\u00a0\u00a0 return<\/strong> 0x00;<\/span><\/em><\/pre>\n
}<\/span><\/em><\/pre>\n
DS1307.h<\/u><\/em><\/strong><\/p>\n
#include<\/strong> \"SW_I2C.h\"<\/span><\/em><\/pre>\n
<\/pre>\n
<\/pre>\n
#define<\/strong> sec_reg<\/strong>\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 0x00<\/span><\/em><\/pre>\n
#define<\/strong> min_reg<\/strong>\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 0x01<\/span><\/em><\/pre>\n
#define<\/strong> hr_reg<\/strong>\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 0x02<\/span><\/em><\/pre>\n
#define<\/strong> day_reg<\/strong>\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 0x03<\/span><\/em><\/pre>\n
#define<\/strong> date_reg<\/strong>\u00a0 \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a00x04<\/span><\/em><\/pre>\n
#define<\/strong> month_reg<\/strong>\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 0x05<\/span><\/em><\/pre>\n
#define<\/strong> year_reg<\/strong>\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 0x06<\/span><\/em><\/pre>\n
#define<\/strong> control_reg<\/strong>\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 0x07<\/span><\/em><\/pre>\n
<\/pre>\n
#define<\/strong> DS1307_addr<\/strong>\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 0xD0<\/span><\/em><\/pre>\n
#define<\/strong> DS1307_WR<\/strong>\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 DS1307_addr<\/span><\/em><\/pre>\n
#define<\/strong> DS1307_RD<\/strong>\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 0xD1<\/span><\/em><\/pre>\n
<\/pre>\n
<\/pre>\n
void<\/strong> DS1307_init<\/strong>(void<\/strong>);<\/span><\/em><\/pre>\n
unsigned<\/strong> char<\/strong> DS1307_read<\/strong>(unsigned<\/strong> char<\/strong> address);<\/span><\/em><\/pre>\n
void<\/strong> DS1307_write<\/strong>(unsigned<\/strong> char<\/strong> address, unsigned<\/strong> char<\/strong> value);<\/span><\/em><\/pre>\n
unsigned<\/strong> char<\/strong> bcd_to_decimal<\/strong>(unsigned<\/strong> char<\/strong> value);<\/span><\/em><\/pre>\n
unsigned<\/strong> char<\/strong> decimal_to_bcd<\/strong>(unsigned<\/strong> char<\/strong> value);<\/span><\/em><\/pre>\n
void<\/strong> get_time<\/strong>(void<\/strong>);<\/span><\/em><\/pre>\n
void<\/strong> set_time<\/strong>(void<\/strong>);<\/span><\/em><\/pre>\n
DS1307.c<\/u><\/em><\/strong><\/p>\n
#include<\/strong> \"DS1307.h\"<\/span><\/em><\/pre>\n
<\/pre>\n
<\/pre>\n
extern<\/strong> struct<\/strong><\/span><\/em><\/pre>\n
{<\/span><\/em><\/pre>\n
\u00a0\u00a0 unsigned<\/strong> char<\/strong> s;<\/span><\/em><\/pre>\n
\u00a0\u00a0 unsigned<\/strong> char<\/strong> m;<\/span><\/em><\/pre>\n
\u00a0\u00a0 unsigned<\/strong> char<\/strong> h;<\/span><\/em><\/pre>\n
\u00a0\u00a0 unsigned<\/strong> char<\/strong> dy;<\/span><\/em><\/pre>\n
\u00a0\u00a0 unsigned<\/strong> char<\/strong> dt;<\/span><\/em><\/pre>\n
\u00a0\u00a0 unsigned<\/strong> char<\/strong> mt;<\/span><\/em><\/pre>\n
\u00a0\u00a0 unsigned<\/strong> char<\/strong> yr;<\/span><\/em><\/pre>\n
}time;<\/span><\/em><\/pre>\n
<\/pre>\n
<\/pre>\n
void<\/strong> DS1307_init<\/strong>(void<\/strong>)<\/span><\/em><\/pre>\n
{<\/span><\/em><\/pre>\n
\u00a0\u00a0\u00a0 SW_I2C_init<\/strong>();<\/span><\/em><\/pre>\n
\u00a0\u00a0\u00a0 DS1307_write<\/strong>(control_reg, 0x00);<\/span><\/em><\/pre>\n
}<\/span><\/em><\/pre>\n
<\/pre>\n
<\/pre>\n
unsigned<\/strong> char<\/strong> DS1307_read<\/strong>(unsigned<\/strong> char<\/strong> address)<\/span><\/em><\/pre>\n
{<\/span><\/em><\/pre>\n
\u00a0\u00a0\u00a0 unsigned<\/strong> char<\/strong> value = 0x00;<\/span><\/em><\/pre>\n
<\/pre>\n
\u00a0\u00a0\u00a0 SW_I2C_start<\/strong>();<\/span><\/em><\/pre>\n
\u00a0\u00a0\u00a0 SW_I2C_write<\/strong>(DS1307_WR);<\/span><\/em><\/pre>\n
\u00a0\u00a0\u00a0 SW_I2C_write<\/strong>(address);<\/span><\/em><\/pre>\n
<\/pre>\n
\u00a0\u00a0\u00a0 SW_I2C_start<\/strong>();<\/span><\/em><\/pre>\n
\u00a0\u00a0\u00a0 SW_I2C_write<\/strong>(DS1307_RD);<\/span><\/em><\/pre>\n
\u00a0\u00a0\u00a0 value = SW_I2C_read<\/strong>(I2C_NACK);<\/span><\/em><\/pre>\n
\u00a0\u00a0\u00a0 SW_I2C_stop<\/strong>();<\/span><\/em><\/pre>\n
<\/pre>\n
\u00a0\u00a0\u00a0 return<\/strong> value;<\/span><\/em><\/pre>\n
}<\/span><\/em><\/pre>\n
<\/pre>\n
<\/pre>\n
void<\/strong> DS1307_write<\/strong>(unsigned<\/strong> char<\/strong> address, unsigned<\/strong> char<\/strong> value)<\/span><\/em><\/pre>\n
{<\/span><\/em><\/pre>\n
\u00a0\u00a0\u00a0 SW_I2C_start<\/strong>();<\/span><\/em><\/pre>\n
\u00a0\u00a0\u00a0 SW_I2C_write<\/strong>(DS1307_WR);<\/span><\/em><\/pre>\n
\u00a0\u00a0\u00a0 SW_I2C_write<\/strong>(address);<\/span><\/em><\/pre>\n
\u00a0\u00a0\u00a0 SW_I2C_write<\/strong>(value);<\/span><\/em><\/pre>\n
\u00a0\u00a0\u00a0 SW_I2C_stop<\/strong>();<\/span><\/em><\/pre>\n
}<\/span><\/em><\/pre>\n
<\/pre>\n
<\/pre>\n
unsigned<\/strong> char<\/strong> bcd_to_decimal<\/strong>(unsigned<\/strong> char<\/strong> value)<\/span><\/em><\/pre>\n
{<\/span><\/em><\/pre>\n
\u00a0\u00a0\u00a0 return<\/strong> ((value & 0x0F) + (((value & 0xF0) >> 0x04) * 0x0A));<\/span><\/em><\/pre>\n
}<\/span><\/em><\/pre>\n
<\/pre>\n
<\/pre>\n
unsigned<\/strong> char<\/strong> decimal_to_bcd<\/strong>(unsigned<\/strong> char<\/strong> value)<\/span><\/em><\/pre>\n
{<\/span><\/em><\/pre>\n
\u00a0\u00a0\u00a0 return<\/strong> (((value \/ 0x0A) << 0x04) & 0xF0) | ((value % 0x0A) & 0x0F);<\/span><\/em><\/pre>\n
}<\/span><\/em><\/pre>\n
<\/pre>\n
<\/pre>\n
void<\/strong> get_time<\/strong>(void<\/strong>)<\/span><\/em><\/pre>\n
{<\/span><\/em><\/pre>\n
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 time.s = DS1307_read<\/strong>(sec_reg);<\/span><\/em><\/pre>\n
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 time.s = bcd_to_decimal<\/strong>(time.s);<\/span><\/em><\/pre>\n
<\/pre>\n
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 time.m = DS1307_read<\/strong>(min_reg);<\/span><\/em><\/pre>\n
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 time.m = bcd_to_decimal<\/strong>(time.m);<\/span><\/em><\/pre>\n
<\/pre>\n
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 time.h = DS1307_read<\/strong>(hr_reg);<\/span><\/em><\/pre>\n
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 time.h = bcd_to_decimal<\/strong>(time.h);<\/span><\/em><\/pre>\n
<\/pre>\n
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 time.dy = DS1307_read<\/strong>(day_reg);<\/span><\/em><\/pre>\n
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 time.dy = bcd_to_decimal<\/strong>(time.dy);<\/span><\/em><\/pre>\n
<\/pre>\n
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 time.dt = DS1307_read<\/strong>(date_reg);<\/span><\/em><\/pre>\n
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 time.dt = bcd_to_decimal<\/strong>(time.dt);<\/span><\/em><\/pre>\n
<\/pre>\n
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 time.mt = DS1307_read<\/strong>(month_reg);<\/span><\/em><\/pre>\n
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 time.mt = bcd_to_decimal<\/strong>(time.mt);<\/span><\/em><\/pre>\n
<\/pre>\n
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 time.yr = DS1307_read<\/strong>(year_reg);<\/span><\/em><\/pre>\n
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 time.yr = bcd_to_decimal<\/strong>(time.yr);<\/span><\/em><\/pre>\n
}<\/span><\/em><\/pre>\n
<\/pre>\n
<\/pre>\n
void<\/strong> set_time<\/strong>(void<\/strong>)<\/span><\/em><\/pre>\n
{<\/span><\/em><\/pre>\n
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 time.s = decimal_to_bcd<\/strong>(time.s);<\/span><\/em><\/pre>\n
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 DS1307_write<\/strong>(sec_reg, time.s);<\/span><\/em><\/pre>\n
<\/pre>\n
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 time.m = decimal_to_bcd<\/strong>(time.m);<\/span><\/em><\/pre>\n
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 DS1307_write<\/strong>(min_reg, time.m);<\/span><\/em><\/pre>\n
<\/pre>\n
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 time.h = decimal_to_bcd<\/strong>(time.h);<\/span><\/em><\/pre>\n
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 DS1307_write<\/strong>(hr_reg, time.h);<\/span><\/em><\/pre>\n
<\/pre>\n
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 time.dy = decimal_to_bcd<\/strong>(time.dy);<\/span><\/em><\/pre>\n
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 DS1307_write<\/strong>(day_reg, time.dy);<\/span><\/em><\/pre>\n
<\/pre>\n
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 time.dt = decimal_to_bcd<\/strong>(time.dt);<\/span><\/em><\/pre>\n
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 DS1307_write<\/strong>(date_reg, time.dt);<\/span><\/em><\/pre>\n
<\/pre>\n
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 time.mt = decimal_to_bcd<\/strong>(time.mt);<\/span><\/em><\/pre>\n
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 DS1307_write<\/strong>(month_reg, time.mt);<\/span><\/em><\/pre>\n
<\/pre>\n
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 time.yr = decimal_to_bcd<\/strong>(time.yr);<\/span><\/em><\/pre>\n
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 DS1307_write<\/strong>(year_reg, time.yr);<\/span><\/em><\/pre>\n
}<\/span><\/em><\/pre>\n
main.c<\/u><\/em><\/strong><\/p>\n
#include<\/strong> \"STM8S.h\"<\/span><\/em><\/pre>\n
#include<\/strong> \"lcd.h\"<\/span><\/em><\/pre>\n
#include<\/strong> \"SW_I2C.h\"<\/span><\/em><\/pre>\n
#include<\/strong> \"DS1307.h\"<\/span><\/em><\/pre>\n
<\/pre>\n
<\/pre>\n
#define<\/strong> Button_port<\/strong>\u00a0\u00a0\u00a0\u00a0\u00a0 GPIOB<\/span><\/em><\/pre>\n
#define<\/strong> Button_pin<\/strong>\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 GPIO_PIN_7<\/span><\/em><\/pre>\n
<\/pre>\n
<\/pre>\n
struct<\/strong><\/span><\/em><\/pre>\n
{<\/span><\/em><\/pre>\n
\u00a0\u00a0 unsigned<\/strong> char<\/strong> s;<\/span><\/em><\/pre>\n
\u00a0\u00a0 unsigned<\/strong> char<\/strong> m;<\/span><\/em><\/pre>\n
\u00a0\u00a0 unsigned<\/strong> char<\/strong> h;<\/span><\/em><\/pre>\n
\u00a0\u00a0 unsigned<\/strong> char<\/strong> dy;<\/span><\/em><\/pre>\n
\u00a0\u00a0 unsigned<\/strong> char<\/strong> dt;<\/span><\/em><\/pre>\n
\u00a0\u00a0 unsigned<\/strong> char<\/strong> mt;<\/span><\/em><\/pre>\n
\u00a0\u00a0 unsigned<\/strong> char<\/strong> yr;<\/span><\/em><\/pre>\n
}time;<\/span><\/em><\/pre>\n
<\/pre>\n
bool set = FALSE;<\/span><\/em><\/pre>\n
<\/pre>\n
unsigned<\/strong> char<\/strong> menu = 0;<\/span><\/em><\/pre>\n
unsigned<\/strong> char<\/strong> data_value;<\/span><\/em><\/pre>\n
<\/pre>\n
<\/pre>\n
void<\/strong> clock_setup<\/strong>(void<\/strong>);<\/span><\/em><\/pre>\n
void<\/strong> GPIO_setup<\/strong>(void<\/strong>);<\/span><\/em><\/pre>\n
void<\/strong> show_value<\/strong>(unsigned<\/strong> char<\/strong> x_pos, unsigned<\/strong> char<\/strong> y_pos, unsigned<\/strong> char<\/strong> value);<\/span><\/em><\/pre>\n
void<\/strong> display_time<\/strong>(void<\/strong>);<\/span><\/em><\/pre>\n
void<\/strong> setup_time<\/strong>(void<\/strong>);<\/span><\/em><\/pre>\n
unsigned<\/strong> char<\/strong> adjust<\/strong>(unsigned<\/strong> char<\/strong> x_pos, unsigned<\/strong> char<\/strong> y_pos, signed<\/strong> char<\/strong> value_max, signed<\/strong> char<\/strong> value_min, signed<\/strong> char<\/strong> value);<\/span><\/em><\/pre>\n
<\/pre>\n
<\/pre>\n
void<\/strong> main<\/strong>(void<\/strong>)<\/span><\/em><\/pre>\n
{<\/span><\/em><\/pre>\n
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 clock_setup<\/strong>();<\/span><\/em><\/pre>\n
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 GPIO_setup<\/strong>();<\/span><\/em><\/pre>\n
<\/pre>\n
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 DS1307_init<\/strong>();<\/span><\/em><\/pre>\n
<\/pre>\n
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 LCD_init<\/strong>();<\/span><\/em><\/pre>\n
\u00a0\u00a0\u00a0 \u00a0\u00a0 LCD_clear_home<\/strong>();<\/span><\/em><\/pre>\n
<\/pre>\n
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 LCD_goto<\/strong>(0, 0);<\/span><\/em><\/pre>\n
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 LCD_putstr<\/strong>(\"STM8 SW-I2C Test\");<\/span><\/em><\/pre>\n
<\/pre>\n
\u00a0\u00a0\u00a0 while<\/strong>(1)<\/span><\/em><\/pre>\n
\u00a0\u00a0\u00a0 {<\/span><\/em><\/pre>\n
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 if<\/strong>((GPIO_ReadInputPin<\/strong>(Button_port, Button_pin) == FALSE) && (set == FALSE))<\/span><\/em><\/pre>\n
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 {<\/span><\/em><\/pre>\n
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 delay_ms<\/strong>(1000);<\/span><\/em><\/pre>\n
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 if<\/strong>(GPIO_ReadInputPin<\/strong>(Button_port, Button_pin) == FALSE)<\/span><\/em><\/pre>\n
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 {<\/span><\/em><\/pre>\n
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 while<\/strong>(GPIO_ReadInputPin<\/strong>(Button_port, Button_pin) == FALSE);<\/span><\/em><\/pre>\n
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 delay_ms<\/strong>(1000);<\/span><\/em><\/pre>\n
<\/pre>\n
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 menu = 0;<\/span><\/em><\/pre>\n
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 set = TRUE;<\/span><\/em><\/pre>\n
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 }<\/span><\/em><\/pre>\n
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 }<\/span><\/em><\/pre>\n
<\/pre>\n
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 if<\/strong>(set)<\/span><\/em><\/pre>\n
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 {<\/span><\/em><\/pre>\n
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 setup_time<\/strong>();<\/span><\/em><\/pre>\n
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 }<\/span><\/em><\/pre>\n
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 else<\/strong><\/span><\/em><\/pre>\n
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 {<\/span><\/em><\/pre>\n
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 get_time<\/strong>();<\/span><\/em><\/pre>\n
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 display_time<\/strong>();<\/span><\/em><\/pre>\n
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 }<\/span><\/em><\/pre>\n
\u00a0\u00a0\u00a0 };<\/span><\/em><\/pre>\n
}<\/span><\/em><\/pre>\n
<\/pre>\n
<\/pre>\n
void<\/strong> clock_setup<\/strong>(void<\/strong>)<\/span><\/em><\/pre>\n
{<\/span><\/em><\/pre>\n
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 CLK_DeInit<\/strong>();<\/span><\/em><\/pre>\n
<\/pre>\n
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 CLK_HSECmd<\/strong>(DISABLE);<\/span><\/em><\/pre>\n
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 CLK_LSICmd<\/strong>(DISABLE);<\/span><\/em><\/pre>\n
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 CLK_HSICmd<\/strong>(ENABLE);<\/span><\/em><\/pre>\n
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 while<\/strong>(CLK_GetFlagStatus<\/strong>(CLK_FLAG_HSIRDY) == FALSE);<\/span><\/em><\/pre>\n
<\/pre>\n
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 CLK_ClockSwitchCmd<\/strong>(ENABLE);<\/span><\/em><\/pre>\n
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 CLK_HSIPrescalerConfig<\/strong>(CLK_PRESCALER_HSIDIV2);<\/span><\/em><\/pre>\n
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 CLK_SYSCLKConfig<\/strong>(CLK_PRESCALER_CPUDIV1);<\/span><\/em><\/pre>\n
<\/pre>\n
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 CLK_ClockSwitchConfig<\/strong>(CLK_SWITCHMODE_AUTO, CLK_SOURCE_HSI,<\/span><\/em><\/pre>\n
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 DISABLE, CLK_CURRENTCLOCKSTATE_ENABLE);<\/span><\/em><\/pre>\n
<\/pre>\n
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 CLK_PeripheralClockConfig<\/strong>(CLK_PERIPHERAL_SPI, ENABLE);<\/span><\/em><\/pre>\n
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 CLK_PeripheralClockConfig<\/strong>(CLK_PERIPHERAL_I2C, DISABLE);<\/span><\/em><\/pre>\n
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 CLK_PeripheralClockConfig<\/strong>(CLK_PERIPHERAL_ADC, DISABLE);<\/span><\/em><\/pre>\n
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 CLK_PeripheralClockConfig<\/strong>(CLK_PERIPHERAL_AWU, DISABLE);<\/span><\/em><\/pre>\n
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 CLK_PeripheralClockConfig<\/strong>(CLK_PERIPHERAL_UART1, DISABLE);<\/span><\/em><\/pre>\n
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 CLK_PeripheralClockConfig<\/strong>(CLK_PERIPHERAL_TIMER1, DISABLE);<\/span><\/em><\/pre>\n
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 CLK_PeripheralClockConfig<\/strong>(CLK_PERIPHERAL_TIMER2, DISABLE);<\/span><\/em><\/pre>\n
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 CLK_PeripheralClockConfig<\/strong>(CLK_PERIPHERAL_TIMER4, DISABLE);<\/span><\/em><\/pre>\n
}<\/span><\/em><\/pre>\n
<\/pre>\n
<\/pre>\n
void<\/strong> GPIO_setup<\/strong>(void<\/strong>)<\/span><\/em><\/pre>\n
{<\/span><\/em><\/pre>\n
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 GPIO_DeInit<\/strong>(GPIOB);<\/span><\/em><\/pre>\n
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 GPIO_Init<\/strong>(Button_port, Button_pin, GPIO_MODE_IN_PU_NO_IT);<\/span><\/em><\/pre>\n
}<\/span><\/em><\/pre>\n
<\/pre>\n
<\/pre>\n
void<\/strong> show_value<\/strong>(unsigned<\/strong> char<\/strong> x_pos, unsigned<\/strong> char<\/strong> y_pos, unsigned<\/strong> char<\/strong> value)<\/span><\/em><\/pre>\n
{<\/span><\/em><\/pre>\n
\u00a0\u00a0 char<\/strong> ch[0x03] = {0x20, 0x20, '\\0'};<\/span><\/em><\/pre>\n
<\/pre>\n
\u00a0\u00a0 ch[0] = (((value \/ 10) % 10) + 0x30);<\/span><\/em><\/pre>\n
\u00a0\u00a0 ch[1] = ((value % 10) + 0x30);<\/span><\/em><\/pre>\n
<\/pre>\n
\u00a0\u00a0 LCD_goto<\/strong>(x_pos, y_pos);<\/span><\/em><\/pre>\n
\u00a0\u00a0 LCD_putstr<\/strong>(ch);<\/span><\/em><\/pre>\n
}<\/span><\/em><\/pre>\n
<\/pre>\n
<\/pre>\n
void<\/strong> display_time<\/strong>(void<\/strong>)<\/span><\/em><\/pre>\n
{\u00a0\u00a0\u00a0\u00a0\u00a0<\/span><\/em><\/pre>\n
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 show_value<\/strong>(4, 1, time.h);<\/span><\/em><\/pre>\n
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 show_value<\/strong>(7, 1, time.m);<\/span><\/em><\/pre>\n
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 show_value<\/strong>(10, 1, time.s);<\/span><\/em><\/pre>\n
<\/pre>\n
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 LCD_goto<\/strong>(6, 1);<\/span><\/em><\/pre>\n
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 LCD_putchar<\/strong>(':');<\/span><\/em><\/pre>\n
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 LCD_goto<\/strong>(9, 1);<\/span><\/em><\/pre>\n
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 LCD_putchar<\/strong>(':');\u00a0\u00a0<\/span><\/em><\/pre>\n
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 delay_ms<\/strong>(100);<\/span><\/em><\/pre>\n
}<\/span><\/em><\/pre>\n
<\/pre>\n
<\/pre>\n
void<\/strong> setup_time<\/strong>(void<\/strong>)<\/span><\/em><\/pre>\n
{<\/span><\/em><\/pre>\n
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 switch<\/strong>(menu)<\/span><\/em><\/pre>\n
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 {<\/span><\/em><\/pre>\n
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 case<\/strong> 0:<\/span><\/em><\/pre>\n
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 {<\/span><\/em><\/pre>\n
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 time.h = adjust<\/strong>(4, 1, 23, 0, time.h);<\/span><\/em><\/pre>\n
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 break<\/strong>;<\/span><\/em><\/pre>\n
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 }\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/span><\/em><\/pre>\n
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 case<\/strong> 1:<\/span><\/em><\/pre>\n
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 {<\/span><\/em><\/pre>\n
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 time.m = adjust<\/strong>(7, 1, 59, 0, time.m);<\/span><\/em><\/pre>\n
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 break<\/strong>;<\/span><\/em><\/pre>\n
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 }<\/span><\/em><\/pre>\n
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 case<\/strong> 2:<\/span><\/em><\/pre>\n
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 {<\/span><\/em><\/pre>\n
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 time.s = adjust<\/strong>(10, 1, 59, 0, time.s);<\/span><\/em><\/pre>\n
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 break<\/strong>;<\/span><\/em><\/pre>\n
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 }<\/span><\/em><\/pre>\n
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 }<\/span><\/em><\/pre>\n
}<\/span><\/em><\/pre>\n
<\/pre>\n
<\/pre>\n
unsigned<\/strong> char<\/strong> adjust<\/strong>(unsigned<\/strong> char<\/strong> x_pos, unsigned<\/strong> char<\/strong> y_pos, signed<\/strong> char<\/strong> value_max, signed<\/strong> char<\/strong> value_min, signed<\/strong> char<\/strong> value)<\/span><\/em><\/pre>\n
{<\/span><\/em><\/pre>\n
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 if<\/strong>(GPIO_ReadInputPin<\/strong>(Button_port, Button_pin) == FALSE)<\/span><\/em><\/pre>\n
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 {<\/span><\/em><\/pre>\n
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 delay_ms<\/strong>(900);<\/span><\/em><\/pre>\n
<\/pre>\n
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 if<\/strong>(GPIO_ReadInputPin<\/strong>(Button_port, Button_pin) == FALSE)<\/span><\/em><\/pre>\n
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 {<\/span><\/em><\/pre>\n
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 while<\/strong>(GPIO_ReadInputPin<\/strong>(Button_port, Button_pin) == FALSE);<\/span><\/em><\/pre>\n
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 menu++;<\/span><\/em><\/pre>\n
<\/pre>\n
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 if<\/strong>(menu >= 3)<\/span><\/em><\/pre>\n
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 {<\/span><\/em><\/pre>\n
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 LCD_goto<\/strong>(3, 1);<\/span><\/em><\/pre>\n
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 LCD_putchar<\/strong>(' ');<\/span><\/em><\/pre>\n
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 LCD_goto<\/strong>(12, 1);<\/span><\/em><\/pre>\n
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 LCD_putchar<\/strong>(' ');\u00a0\u00a0<\/span><\/em><\/pre>\n
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 set_time<\/strong>();<\/span><\/em><\/pre>\n
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 set = FALSE;<\/span><\/em><\/pre>\n
<\/pre>\n
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 return<\/strong>;<\/span><\/em><\/pre>\n
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 }<\/span><\/em><\/pre>\n
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 }<\/span><\/em><\/pre>\n
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 }<\/span><\/em><\/pre>\n
<\/pre>\n
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 else<\/strong><\/span><\/em><\/pre>\n
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 {<\/span><\/em><\/pre>\n
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 value++;<\/span><\/em><\/pre>\n
<\/pre>\n
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 if<\/strong>(value > value_max)<\/span><\/em><\/pre>\n
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 {<\/span><\/em><\/pre>\n
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 \u00a0\u00a0\u00a0 value = value_min;<\/span><\/em><\/pre>\n
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 }<\/span><\/em><\/pre>\n
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 }<\/span><\/em><\/pre>\n
<\/pre>\n
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 LCD_goto<\/strong>(3, 1);<\/span><\/em><\/pre>\n
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 LCD_putchar<\/strong>('<');<\/span><\/em><\/pre>\n
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 LCD_goto<\/strong>(12, 1);<\/span><\/em><\/pre>\n
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 LCD_putchar<\/strong>('>');\u00a0\u00a0<\/span><\/em><\/pre>\n
<\/pre>\n
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 LCD_goto<\/strong>(x_pos, y_pos);<\/span><\/em><\/pre>\n
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 LCD_putstr<\/strong>(\"\u00a0 \");<\/span><\/em><\/pre>\n
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 delay_ms<\/strong>(90);<\/span><\/em><\/pre>\n
<\/pre>\n
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 show_value<\/strong>(x_pos, y_pos, value);<\/span><\/em><\/pre>\n
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 delay_ms<\/strong>(90);<\/span><\/em><\/pre>\n
<\/pre>\n
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 return<\/strong> value;<\/span><\/em><\/pre>\n
}<\/span><\/em><\/pre>\n
<\/pre>\n
Explanation<\/h4>\n
SW_I2C.h<\/em><\/strong> and SW_I2C.c<\/em><\/strong> files translate the entire I2C communication operations with the manipulation of ordinary GPIOs. Any GPIO pin pair can be used for software I2C. Just define the software I2C port, and the serial data (SDA) and serial clock (SDA) pins:<\/p>\n
#define<\/strong> SW_I2C_port<\/strong>\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 GPIOD<\/span><\/em><\/pre>\n
<\/pre>\n
#define<\/strong> SDA_pin<\/strong>\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 GPIO_PIN_6<\/span><\/em><\/pre>\n
#define<\/strong> SCL_pin<\/strong> \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 GPIO_PIN_7<\/span><\/em><\/pre>\n
The functions in these files are self-explanatory and so I\u2019m not going to explain them here.<\/p>\n
The rest of the code is about using the software I2C library with DS1307 real time clock (RTC) chip to make a real time clock.<\/p>\n
Demo<\/h4>\n
\"SW-I2C\"<\/a><\/p>\n