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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

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yelvlab
2024-12-28 18:39:11 +08:00
parent 97587ba990
commit 7d6be9f390
7 changed files with 257 additions and 185 deletions
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137
src/i2c.c
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@@ -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