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

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;
+}