添加board_config.h作为全部板上IO的宏定义位置，独立soft_i2c为单独文件

CMakeLists.txt

@@ -29,6 +29,7 @@ set(TARGET_C_SRC
         ${CMAKE_SOURCE_DIR}/src/rs485.c
         ${CMAKE_SOURCE_DIR}/src/led.c
         ${CMAKE_SOURCE_DIR}/src/i2c.c
+        ${CMAKE_SOURCE_DIR}/src/soft_i2c.c
 )
 
 add_executable(xlsw_3dp_LDC1612 ${TARGET_C_SRC})

inc/board_config.h

@@ -0,0 +1,21 @@
+//
+// Created by dell on 24-12-28.
+//
+
+#ifndef BOARD_CONFIG_H
+#define BOARD_CONFIG_H
+
+/******************************************************************************/
+
+#define I2C_SPEED       20000
+#define RCU_GPIO_I2C    RCU_GPIOF
+#define RCU_I2C         RCU_I2C0
+#define I2C_SCL_PORT    GPIOF
+#define I2C_SCL_PIN     GPIO_PIN_1
+#define I2C_SDA_PORT    GPIOF
+#define I2C_SDA_PIN     GPIO_PIN_0
+#define I2C_GPIO_AF     GPIO_AF_1
+
+/******************************************************************************/
+
+#endif //BOARD_CONFIG_H

inc/i2c.h

@@ -15,16 +15,7 @@
 #include <stdlib.h>
 #include <math.h>
 
-/******************************************************************************/
+#include "board_config.h"
-
-#define I2C_SPEED       20000
-#define RCU_GPIO_I2C    RCU_GPIOF
-#define RCU_I2C         RCU_I2C0
-#define I2C_SCL_PORT    GPIOF
-#define I2C_SCL_PIN     GPIO_PIN_1
-#define I2C_SDA_PORT    GPIOF
-#define I2C_SDA_PIN     GPIO_PIN_0
-#define I2C_GPIO_AF     GPIO_AF_1
 
 /******************************************************************************/
 
@@ -55,24 +46,6 @@ typedef enum {
 
 void i2c_gpio_config(void);
 
-void si2c_config(void);
-
-void i2c_delay(void);
-
-void i2c_start(void);
-
-void i2c_stop(void);
-
-void i2c_send_ack(void);
-
-void i2c_send_nack(void);
-
-uint8_t i2c_wait_ack(void);
-
-void i2c_send_byte(uint8_t byte);
-
-uint8_t i2c_receive_byte(uint8_t ack);
-
 void i2c_config(void);
 
 void i2c_bus_reset(void);

inc/soft_i2c.h

@@ -0,0 +1,37 @@
+//
+// Created by dell on 24-12-28.
+//
+
+#ifndef SOFT_I2C_H
+#define SOFT_I2C_H
+
+#include "gd32e23x_it.h"
+#include "gd32e23x.h"
+#include "systick.h"
+#include "main.h"
+
+#include "board_config.h"
+
+/******************************************************************************/
+
+#define I2C_SCL_HIGH()      gpio_bit_set(I2C_SCL_PORT, I2C_SCL_PIN)
+#define I2C_SCL_LOW()       gpio_bit_reset(I2C_SCL_PORT, I2C_SCL_PIN)
+#define I2C_SDA_HIGH()      gpio_bit_set(I2C_SDA_PORT, I2C_SDA_PIN)
+#define I2C_SDA_LOW()       gpio_bit_reset(I2C_SDA_PORT, I2C_SDA_PIN)
+#define I2C_SDA_READ()      gpio_input_bit_get(I2C_SDA_PORT, I2C_SDA_PIN)
+
+/******************************************************************************/
+
+void i2c_delay(void);
+
+void soft_i2c_config(void);
+
+void soft_i2c_start(void);
+void soft_i2c_stop(void);
+void soft_i2c_send_ack(void);
+void soft_i2c_send_nack(void);
+uint8_t soft_i2c_wait_ack(void);
+void soft_i2c_send_byte(uint8_t data);
+uint8_t soft_i2c_receive_byte(uint8_t ack);
+
+#endif //SOFT_I2C_H

src/i2c.c

@@ -25,143 +25,6 @@ void i2c_gpio_config(void) {
     gpio_output_options_set(I2C_SDA_PORT, GPIO_OTYPE_OD, GPIO_OSPEED_50MHZ, I2C_SDA_PIN);
 }
 
-void i2c_delay(void) {
-    delay_us(20); // Adjust delay as needed
-}
-
-/*!
-    \brief      configure the software IIC GPIO
-    \param[in]  none
-    \param[out] none
-    \retval     none
-*/
-void si2c_config(void) {
-    rcu_periph_clock_enable(RCU_GPIO_I2C);
-
-    gpio_mode_set(I2C_SCL_PORT, GPIO_MODE_OUTPUT, GPIO_PUPD_PULLUP, I2C_SCL_PIN);
-    gpio_output_options_set(I2C_SCL_PORT, GPIO_OTYPE_OD, GPIO_OSPEED_50MHZ, I2C_SCL_PIN);
-
-    gpio_mode_set(I2C_SDA_PORT, GPIO_MODE_OUTPUT, GPIO_PUPD_PULLUP, I2C_SDA_PIN);
-    gpio_output_options_set(I2C_SDA_PORT, GPIO_OTYPE_OD, GPIO_OSPEED_50MHZ, I2C_SDA_PIN);
-
-    I2C_SCL_HIGH();
-    I2C_SDA_HIGH();
-}
-
-// void sda_out(void) {
-//     gpio_mode_set(I2C_SDA_PORT, GPIO_MODE_OUTPUT, GPIO_PUPD_PULLUP, I2C_SDA_PIN);
-//     gpio_output_options_set(I2C_SDA_PORT, GPIO_OTYPE_OD, GPIO_OSPEED_50MHZ, I2C_SDA_PIN);
-// }
-//
-// void sda_in(void) {
-//     gpio_mode_set(I2C_SDA_PORT, GPIO_MODE_INPUT, GPIO_PUPD_PULLUP, I2C_SDA_PIN);
-// }
-
-void i2c_start(void) {
-    // sda_out();
-    I2C_SDA_HIGH();
-    I2C_SCL_HIGH();
-    i2c_delay();
-    I2C_SDA_LOW();
-    i2c_delay();
-    I2C_SCL_LOW();
-    i2c_delay();
-    i2c_delay();
-    // 从全高开始，SCL为高期间，SDA下降沿表示start信号，再拉低SCL
-}
-
-void i2c_stop(void) {
-    // sda_out();
-    I2C_SCL_LOW();
-    I2C_SDA_LOW();
-    i2c_delay();
-    I2C_SCL_HIGH();
-    i2c_delay();
-    I2C_SDA_HIGH();
-    // 从全低开始，SCL为高期间，SDA上升沿表示stop
-}
-
-void i2c_send_ack(void) {
-    // sda_out();
-    I2C_SDA_LOW();
-    i2c_delay();
-    I2C_SCL_HIGH();
-    i2c_delay();
-    I2C_SCL_LOW();
-    i2c_delay();
-    I2C_SDA_HIGH();
-    // SCL产生一个正常的时钟周期，其间SDA始终为低电平，表示ACK
-}
-
-void i2c_send_nack(void) {
-    // sda_out();
-    I2C_SDA_HIGH();
-    i2c_delay();
-    I2C_SCL_HIGH();
-    i2c_delay();
-    I2C_SCL_LOW();
-    i2c_delay();
-    I2C_SDA_HIGH();
-    // SCL产生一个正常的时钟周期，其间SDA始终为高电平，表示NACK
-}
-
-uint8_t i2c_wait_ack(void) {
-    // sda_in();
-    I2C_SDA_HIGH();
-    i2c_delay();
-    I2C_SCL_HIGH();
-    i2c_delay();
-    uint8_t ack = !I2C_SDA_READ();
-    //ACK信号是第九个时钟期间，SDA被从机在SCL高期间，拉低并保持低电平。此处判断SDA是否被拉低，被拉低则返回0，取反为1，表示收到ACK
-    I2C_SCL_LOW();
-    return ack;
-}
-
-void i2c_send_byte(uint8_t byte) {
-    // sda_out();
-    for (int i = 0; i < 8; i++) {
-        if (byte & 0x80) { //通过&操作获取第一位是1还是0
-            I2C_SDA_HIGH(); //SCL低电平期间，SDA高电平表示1
-        } else {
-            I2C_SDA_LOW(); //SCL低电平期间，SDA低电平表示0
-        }
-        byte <<= 1; //左移一位，把原本第二位的数据移到第一位，再判断高低电平
-        i2c_delay();
-        I2C_SCL_HIGH(); //SCL拉高电平，SDA电平状态保持不变
-        i2c_delay();
-        I2C_SCL_LOW(); //SCL拉低电平
-        delay_us(5);
-    }
-    // i2c_wait_ack();
-}
-
-uint8_t i2c_receive_byte(uint8_t ack) {
-    // sda_in();
-    uint8_t byte = 0;
-    I2C_SDA_HIGH(); //从高开始
-    for (int i = 0; i < 8; i++) {
-        byte <<= 1;
-        I2C_SCL_HIGH();
-        i2c_delay();
-        if (I2C_SDA_READ()) {
-            byte |= 0x01;
-        }
-        I2C_SCL_LOW();
-        i2c_delay();
-    }
-    if (ack) {
-        i2c_send_ack();
-    } else {
-        i2c_send_nack();
-    }
-    return byte;
-}
-
-
-
-
-
-
 /*!
     \brief      configure the I2CX interface
     \param[in]  none

src/main.c

@@ -12,6 +12,7 @@
 #include "rs485.h"
 #include "led.h"
 #include "i2c.h"
+#include "soft_i2c.h"
 #include "ldc1612.h"
 #include "tmp112.h"
 
@@ -75,10 +76,26 @@ int main(void) {
     watchdog_init();
 
     while (1) {
-        si2c_config();
+        soft_i2c_config();
         printf("111\n");
 
         i2c_start();
+        i2c_send_byte((0x2B << 1));
+        if (!i2c_wait_ack())
+        {
+            printf("NACK\n");
+        }
+
+
+        i2c_send_byte(0x7E);
+        if (!i2c_wait_ack())
+        {
+            printf("NACK\n");
+        }
+
+        i2c_delay();
+        i2c_start();
+
         i2c_send_byte((0x2B << 1) + 1);
         if (!i2c_wait_ack())
         {
@@ -87,30 +104,11 @@ int main(void) {
 
         i2c_delay();
 
-        i2c_send_byte(0x7E);
-        // if (!i2c_wait_ack())
-        // {
-        //     printf("NACK\n");
-        // }
-
-        i2c_delay();
-        i2c_start();
-
-        i2c_send_byte((0x2B << 1));
-        if (!i2c_wait_ack())
-        {
-            printf("NACK\n");
-        }
-
-        i2c_delay();
-
         data[0] = i2c_receive_byte(1);
-        i2c_delay();
         data[1] = i2c_receive_byte(0);
 
         delay_us(5);
         i2c_stop();
-        // printf("OK\n");
 
         printf("0x%x 0x%x\n", data[0], data[1]);
 

src/soft_i2c.c

@@ -0,0 +1,179 @@
+//
+// Created by dell on 24-12-28.
+//
+
+#include "soft_i2c.h"
+
+/*!
+    \brief      delay
+    \param[in]  none
+    \param[out] none
+    \retval     none
+*/
+void i2c_delay(void) {
+    delay_us(20); // Adjust delay as needed
+    /* delay to freq
+     *  20KHz: delay_us(20);
+     *  65KHz: delay_us(1);
+     */
+}
+
+/*!
+    \brief      configure the software IIC GPIO
+    \param[in]  none
+    \param[out] none
+    \retval     none
+*/
+void soft_i2c_config(void) {
+    rcu_periph_clock_enable(RCU_GPIO_I2C);
+
+    gpio_mode_set(I2C_SCL_PORT, GPIO_MODE_OUTPUT, GPIO_PUPD_PULLUP, I2C_SCL_PIN);
+    gpio_output_options_set(I2C_SCL_PORT, GPIO_OTYPE_OD, GPIO_OSPEED_50MHZ, I2C_SCL_PIN);
+
+    gpio_mode_set(I2C_SDA_PORT, GPIO_MODE_OUTPUT, GPIO_PUPD_PULLUP, I2C_SDA_PIN);
+    gpio_output_options_set(I2C_SDA_PORT, GPIO_OTYPE_OD, GPIO_OSPEED_50MHZ, I2C_SDA_PIN);
+
+    I2C_SCL_HIGH();
+    I2C_SDA_HIGH();
+}
+
+/*!
+    \brief      generate I2C start signal
+    \param[in]  none
+    \param[out] none
+    \retval     none
+*/
+void soft_i2c_start(void) {
+    // sda_out();
+    I2C_SDA_HIGH();
+    I2C_SCL_HIGH();
+    i2c_delay();
+    I2C_SDA_LOW();
+    i2c_delay();
+    I2C_SCL_LOW();
+    // i2c_delay();
+    // 从全高开始，SCL为高期间，SDA下降沿表示start信号，再拉低SCL
+}
+
+/*!
+    \brief      generate I2C stop signal
+    \param[in]  none
+    \param[out] none
+    \retval     none
+*/
+void soft_i2c_stop(void) {
+    // sda_out();
+    I2C_SCL_LOW();
+    I2C_SDA_LOW();
+    i2c_delay();
+    I2C_SCL_HIGH();
+    i2c_delay();
+    I2C_SDA_HIGH();
+    // 从全低开始，SCL为高期间，SDA上升沿表示stop
+}
+
+/*!
+    \brief      send I2C ACK signal
+    \param[in]  none
+    \param[out] none
+    \retval     none
+*/
+void soft_i2c_send_ack(void) {
+    // sda_out();
+    I2C_SDA_LOW();
+    i2c_delay();
+    I2C_SCL_HIGH();
+    i2c_delay();
+    I2C_SCL_LOW();
+    i2c_delay();
+    I2C_SDA_HIGH();
+    // SCL产生一个正常的时钟周期，其间SDA始终为低电平，表示ACK
+}
+
+/*!
+    \brief      send I2C NACK signal
+    \param[in]  none
+    \param[out] none
+    \retval     none
+*/
+void soft_i2c_send_nack(void) {
+    // sda_out();
+    I2C_SDA_HIGH();
+    i2c_delay();
+    I2C_SCL_HIGH();
+    i2c_delay();
+    I2C_SCL_LOW();
+    i2c_delay();
+    I2C_SDA_HIGH();
+    // SCL产生一个正常的时钟周期，其间SDA始终为高电平，表示NACK
+}
+
+/*!
+    \brief      wait I2C ACK signal
+    \param[in]  none
+    \param[out] none
+    \retval     0: ACK received, 1: ACK not received
+*/
+uint8_t soft_i2c_wait_ack(void) {
+    // sda_in();
+    I2C_SDA_HIGH();
+    i2c_delay();
+    I2C_SCL_HIGH();
+    i2c_delay();
+    uint8_t ack = !I2C_SDA_READ();
+    //ACK信号是第九个时钟期间，SDA被从机在SCL高期间，拉低并保持低电平。此处判断SDA是否被拉低，被拉低则返回0，取反为1，表示收到ACK
+    I2C_SCL_LOW();
+    return ack;
+}
+
+/*!
+    \brief      send a byte via I2C
+    \param[in]  byte: byte to be sent
+    \param[out] none
+    \retval     none
+*/
+void soft_i2c_send_byte(uint8_t byte) {
+    // sda_out();
+    for (int i = 0; i < 8; i++) {
+        if (byte & 0x80) { //通过&操作获取第一位是1还是0
+            I2C_SDA_HIGH(); //SCL低电平期间，SDA高电平表示1
+        } else {
+            I2C_SDA_LOW(); //SCL低电平期间，SDA低电平表示0
+        }
+        byte <<= 1; //左移一位，把原本第二位的数据移到第一位，再判断高低电平
+        i2c_delay();
+        I2C_SCL_HIGH(); //SCL拉高电平，SDA电平状态保持不变
+        i2c_delay();
+        I2C_SCL_LOW(); //SCL拉低电平
+        delay_us(5);
+    }
+    // i2c_wait_ack();
+}
+
+/*!
+    \brief      receive a byte via I2C
+    \param[in]  ack: 1: send ACK, 0: send NACK
+    \param[out] none
+    \retval     received byte
+*/
+uint8_t soft_i2c_receive_byte(uint8_t ack) {
+    // sda_in();
+    uint8_t byte = 0;
+    I2C_SDA_HIGH(); //从高开始
+    for (int i = 0; i < 8; i++) {
+        byte <<= 1;
+        I2C_SCL_HIGH();
+        i2c_delay();
+        if (I2C_SDA_READ()) {
+            byte |= 0x01;
+        }
+        I2C_SCL_LOW();
+        i2c_delay();
+    }
+    if (ack) {
+        soft_i2c_send_ack();
+    } else {
+        soft_i2c_send_nack();
+    }
+    return byte;
+}