// // Created by dell on 24-12-28. // #include "soft_i2c.h" /*! \brief delay \param[in] none \param[out] none \retval none */ void soft_i2c_delay(void) { delay_10us(2); // Adjust delay as needed /* delay to freq * 15KHz: 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) { I2C_SDA_HIGH(); I2C_SCL_HIGH(); soft_i2c_delay(); I2C_SDA_LOW(); soft_i2c_delay(); I2C_SCL_LOW(); } /*! \brief generate I2C stop signal \param[in] none \param[out] none \retval none */ void soft_i2c_stop(void) { I2C_SCL_LOW(); // 确保时钟为低 I2C_SDA_LOW(); // 拉低数据线 soft_i2c_delay(); I2C_SCL_HIGH(); // 拉高时钟 soft_i2c_delay(); I2C_SDA_HIGH(); // 在时钟高电平时拉高数据线产生停止条件 soft_i2c_delay(); // 添加缺失的延时 } /*! \brief send I2C ACK signal \param[in] none \param[out] none \retval none */ void soft_i2c_send_ack(void) { // sda_out(); I2C_SDA_LOW(); soft_i2c_delay(); I2C_SCL_HIGH(); soft_i2c_delay(); I2C_SCL_LOW(); soft_i2c_delay(); I2C_SDA_HIGH(); } /*! \brief send I2C NACK signal \param[in] none \param[out] none \retval none */ void soft_i2c_send_nack(void) { I2C_SDA_HIGH(); soft_i2c_delay(); I2C_SCL_HIGH(); soft_i2c_delay(); I2C_SCL_LOW(); soft_i2c_delay(); I2C_SDA_HIGH(); } /*! \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) { I2C_SDA_HIGH(); // 释放SDA线,让从设备控制 soft_i2c_delay(); I2C_SCL_HIGH(); // 拉高时钟 soft_i2c_delay(); uint8_t ack = !I2C_SDA_READ(); // 读取ACK信号(低电平为ACK) I2C_SCL_LOW(); // 拉低时钟 soft_i2c_delay(); // 添加缺失的延时 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) { I2C_SDA_HIGH(); } else { I2C_SDA_LOW(); } byte <<= 1; soft_i2c_delay(); I2C_SCL_HIGH(); soft_i2c_delay(); I2C_SCL_LOW(); soft_i2c_delay(); } } /*! \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) { uint8_t byte = 0; I2C_SDA_HIGH(); for (int i = 0; i < 8; i++) { byte <<= 1; I2C_SCL_HIGH(); soft_i2c_delay(); if (I2C_SDA_READ()) { byte |= 0x01; } I2C_SCL_LOW(); soft_i2c_delay(); } if (ack) { soft_i2c_send_ack(); } else { soft_i2c_send_nack(); } return byte; } uint8_t soft_i2c_write_16bits(uint8_t slave_addr, uint8_t reg_addr, uint8_t data[2]) { /* 参数验证 */ if (data == NULL || slave_addr > 0x7F) { return SOFT_I2C_FAIL; } soft_i2c_start(); soft_i2c_send_byte(slave_addr << 1); // 修复:左移1位,添加写位 if (!soft_i2c_wait_ack()) { soft_i2c_stop(); return SOFT_I2C_FAIL; } soft_i2c_send_byte(reg_addr); if (!soft_i2c_wait_ack()) { soft_i2c_stop(); return SOFT_I2C_FAIL; } soft_i2c_send_byte(data[0]); if (!soft_i2c_wait_ack()) { soft_i2c_stop(); return SOFT_I2C_FAIL; } soft_i2c_send_byte(data[1]); if (!soft_i2c_wait_ack()) { // 修复:添加错误处理 soft_i2c_stop(); return SOFT_I2C_FAIL; } soft_i2c_stop(); return SOFT_I2C_OK; } uint8_t soft_i2c_read_16bits(uint8_t slave_addr, uint8_t reg_addr, uint8_t *data) { /* 参数验证 */ if (data == NULL || slave_addr > 0x7F) { return SOFT_I2C_FAIL; } /* 写阶段:发送寄存器地址 */ soft_i2c_start(); soft_i2c_send_byte(slave_addr << 1); // 修复:左移1位,写操作 if (!soft_i2c_wait_ack()) { soft_i2c_stop(); return SOFT_I2C_FAIL; } soft_i2c_send_byte(reg_addr); if (!soft_i2c_wait_ack()) { soft_i2c_stop(); return SOFT_I2C_FAIL; } /* 读阶段:重新开始并读取数据 */ soft_i2c_start(); // 重新开始 soft_i2c_send_byte((slave_addr << 1) | 0x01); // 修复:正确的读地址 if (!soft_i2c_wait_ack()) { soft_i2c_stop(); return SOFT_I2C_FAIL; } soft_i2c_delay(); data[0] = soft_i2c_receive_byte(1); // 第一个字节发送ACK data[1] = soft_i2c_receive_byte(0); // 最后一个字节发送NACK soft_i2c_stop(); return SOFT_I2C_OK; }