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add old HIIC/SIIC code

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yelvlab
2025-08-13 20:44:52 +08:00
parent ee2a1d5c9c
commit d1b0b7c3ed
4 changed files with 799 additions and 0 deletions
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476
Src/i2c.c Normal file
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//
// Created by dell on 24-12-20.
//
#include "i2c.h"
/*!
\brief configure the GPIO ports
\param[in] none
\param[out] none
\retval none
*/
void i2c_gpio_config(void) {
/* enable IIC GPIO clock */
rcu_periph_clock_enable(RCU_GPIO_I2C);
/* connect I2C_SCL_PIN to I2C_SCL */
gpio_af_set(I2C_SCL_PORT, I2C_GPIO_AF, I2C_SCL_PIN);
/* connect I2C_SDA_PIN to I2C_SDA */
gpio_af_set(I2C_SDA_PORT, I2C_GPIO_AF, I2C_SDA_PIN);
/* configure GPIO pins of I2C */
gpio_mode_set(I2C_SCL_PORT, GPIO_MODE_AF, 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_AF, GPIO_PUPD_PULLUP, I2C_SDA_PIN);
gpio_output_options_set(I2C_SDA_PORT, GPIO_OTYPE_OD, GPIO_OSPEED_50MHZ, I2C_SDA_PIN);
}
/*!
\brief configure the I2CX interface
\param[in] none
\param[out] none
\retval none
*/
void i2c_config(void) {
/* configure I2C GPIO */
i2c_gpio_config();
/* enable I2C clock */
rcu_periph_clock_enable(RCU_I2C);
/* configure I2C clock */
i2c_clock_config(I2C0, I2C_SPEED, I2C_DTCY_2);
/* configure I2C address */
i2c_mode_addr_config(I2C0, I2C_I2CMODE_ENABLE, I2C_ADDFORMAT_7BITS, 0xA0);
/* enable I2CX */
i2c_enable(I2C0);
/* enable acknowledge */
i2c_ack_config(I2C0, I2C_ACK_ENABLE);
}
/*!
\brief reset I2C bus
\param[in] none
\param[out] none
\retval none
*/
void i2c_bus_reset(void) {
i2c_deinit(I2C0);
/* configure SDA/SCL for GPIO */
GPIO_BC(I2C_SCL_PORT) |= I2C_SCL_PIN;
GPIO_BC(I2C_SDA_PORT) |= I2C_SDA_PIN;
gpio_output_options_set(I2C_SCL_PORT, GPIO_OTYPE_PP, GPIO_OSPEED_50MHZ, I2C_SCL_PIN);
gpio_output_options_set(I2C_SDA_PORT, GPIO_OTYPE_PP, GPIO_OSPEED_50MHZ, I2C_SDA_PIN);
__NOP();
__NOP();
__NOP();
__NOP();
__NOP();
GPIO_BOP(I2C_SCL_PORT) |= I2C_SCL_PIN;
__NOP();
__NOP();
__NOP();
__NOP();
__NOP();
GPIO_BOP(I2C_SDA_PORT) |= I2C_SDA_PIN;
/* connect I2C_SCL_PIN to I2C_SCL */
/* connect I2C_SDA_PIN to I2C_SDA */
gpio_output_options_set(I2C_SCL_PORT, GPIO_OTYPE_OD, GPIO_OSPEED_50MHZ, I2C_SCL_PIN);
gpio_output_options_set(I2C_SDA_PORT, GPIO_OTYPE_OD, GPIO_OSPEED_50MHZ, I2C_SDA_PIN);
/* configure the I2CX interface */
i2c_config();
}
/**
* @brief 扫描I2C总线，查找连接的设备
*
* 该函数会扫描I2C总线上的所有地址（1到126），并尝试与每个地址进行通信。
* 如果在某个地址上发现了设备，则会打印出该设备的地址。
* 最后会打印出找到的设备总数。
*/
void i2c_scan(void) {
uint32_t timeout;
uint8_t address;
int found_devices = 0;
printf("Scanning I2C bus...\r\n");
for (address = 1; address < 127; address++) {
timeout = 0;
// 生成起始条件
while (i2c_flag_get(I2C0, I2C_FLAG_I2CBSY) && (timeout < I2C_TIME_OUT))
timeout++;
if (timeout >= I2C_TIME_OUT) {
continue; // 超时，跳过该地址
}
i2c_start_on_bus(I2C0);
timeout = 0;
// 等待起始条件发送完成
while (!i2c_flag_get(I2C0, I2C_FLAG_SBSEND) && (timeout < I2C_TIME_OUT))
timeout++;
if (timeout >= I2C_TIME_OUT) {
continue; // 超时，跳过该地址
}
i2c_master_addressing(I2C0, (address << 1), I2C_TRANSMITTER);
timeout = 0;
// 等待地址发送完成
while (!i2c_flag_get(I2C0, I2C_FLAG_ADDSEND) && (timeout < I2C_TIME_OUT))
timeout++;
if (timeout < I2C_TIME_OUT) {
i2c_flag_clear(I2C0, I2C_FLAG_ADDSEND);
printf("Found device at 0x%02X\r\n", address);
found_devices++;
}
// 生成停止条件
i2c_stop_on_bus(I2C0);
timeout = 0;
while (i2c_flag_get(I2C0, I2C_FLAG_STPDET) && (timeout < I2C_TIME_OUT))
timeout++;
}
if (found_devices == 0) {
printf("No I2C devices found.\r\n");
} else {
printf("Total %d I2C devices found.\r\n", found_devices);
}
}
uint8_t i2c_write_16bits(uint8_t slave_addr, uint8_t reg_addr, uint8_t data[2]) {
uint8_t state = I2C_START;
uint16_t timeout = 0;
uint8_t i2c_timeout_flag = 0;
/* enable acknowledge */
i2c_ack_config(I2C0, I2C_ACK_ENABLE);
while (!(i2c_timeout_flag)) {
switch (state) {
case I2C_START:
/* i2c master sends start signal only when the bus is idle */
while (i2c_flag_get(I2C0, I2C_FLAG_I2CBSY) && (timeout < I2C_TIME_OUT)) {
timeout++;
}
if (timeout < I2C_TIME_OUT) {
i2c_start_on_bus(I2C0);
timeout = 0;
state = I2C_SEND_ADDRESS;
} else {
timeout = 0;
state = I2C_START;
#ifdef DEBUG_VERBOES
printf("i2c bus is busy in WRITE BYTE!\n");
#endif
}
break;
case I2C_SEND_ADDRESS:
/* i2c master sends START signal successfully */
while ((!i2c_flag_get(I2C0, I2C_FLAG_SBSEND)) && (timeout < I2C_TIME_OUT)) {
timeout++;
}
if (timeout < I2C_TIME_OUT) {
i2c_master_addressing(I2C0, slave_addr, I2C_TRANSMITTER);
timeout = 0;
state = I2C_CLEAR_ADDRESS_FLAG;
} else {
timeout = 0;
state = I2C_START;
#ifdef DEBUG_VERBOES
printf("i2c master sends start signal timeout in WRITE BYTE!\n");
#endif
}
break;
case I2C_CLEAR_ADDRESS_FLAG:
/* address flag set means i2c slave sends ACK */
while ((!i2c_flag_get(I2C0, I2C_FLAG_ADDSEND)) && (timeout < I2C_TIME_OUT)) {
timeout++;
}
if (timeout < I2C_TIME_OUT) {
i2c_flag_clear(I2C0, I2C_FLAG_ADDSEND);
timeout = 0;
state = I2C_TRANSMIT_DATA;
} else {
timeout = 0;
state = I2C_START;
#ifdef DEBUG_VERBOES
printf("i2c master clears address flag timeout in WRITE BYTE!\n");
#endif
}
break;
case I2C_TRANSMIT_DATA:
/* wait until the transmit data buffer is empty */
while ((!i2c_flag_get(I2C0, I2C_FLAG_TBE)) && (timeout < I2C_TIME_OUT)) {
timeout++;
}
if (timeout < I2C_TIME_OUT) {
/* send IIC register address */
i2c_data_transmit(I2C0, reg_addr);
timeout = 0;
} else {
timeout = 0;
state = I2C_START;
#ifdef DEBUG_VERBOES
printf("i2c master sends data timeout in WRITE BYTE!\n");
#endif
}
/* wait until BTC bit is set */
while ((!i2c_flag_get(I2C0, I2C_FLAG_BTC)) && (timeout < I2C_TIME_OUT)) {
timeout++;
}
if (timeout < I2C_TIME_OUT) {
/* send register MSB value */
i2c_data_transmit(I2C0, data[0]);
timeout = 0;
} else {
timeout = 0;
state = I2C_START;
#ifdef DEBUG_VERBOES
printf("i2c master sends MSB data timeout in WRITE BYTE!\n");
#endif
}
/* wait until BTC bit is set */
while ((!i2c_flag_get(I2C0, I2C_FLAG_BTC)) && (timeout < I2C_TIME_OUT)) {
timeout++;
}
if (timeout < I2C_TIME_OUT) {
/* send register LSB value */
i2c_data_transmit(I2C0, data[1]);
timeout = 0;
state = I2C_STOP;
} else {
timeout = 0;
state = I2C_START;
#ifdef DEBUG_VERBOES
printf("i2c master sends LSB data timeout in WRITE BYTE!\n");
#endif
}
/* wait until BTC bit is set */
while ((!i2c_flag_get(I2C0, I2C_FLAG_BTC)) && (timeout < I2C_TIME_OUT)) {
timeout++;
}
if (timeout < I2C_TIME_OUT) {
state = I2C_STOP;
timeout = 0;
} else {
timeout = 0;
state = I2C_START;
#ifdef DEBUG_VERBOES
printf("i2c master sends data timeout in WRITE BYTE!\n");
#endif
}
break;
case I2C_STOP:
/* send a stop condition to I2C bus */
i2c_stop_on_bus(I2C0);
/* i2c master sends STOP signal successfully */
while ((I2C_CTL0(I2C0) & I2C_CTL0_STOP) && (timeout < I2C_TIME_OUT)) {
timeout++;
}
if (timeout < I2C_TIME_OUT) {
timeout = 0;
state = I2C_END;
i2c_timeout_flag = I2C_OK;
} else {
timeout = 0;
state = I2C_START;
#ifdef DEBUG_VERBOES
printf("i2c master sends stop signal timeout in WRITE BYTE!\n");
#endif
}
break;
default:
state = I2C_START;
i2c_timeout_flag = I2C_OK;
timeout = 0;
#ifdef DEBUG_VERBOES
printf("i2c master sends start signal in WRITE BYTE.\n");
#endif
break;
}
}
return I2C_END;
}
uint8_t i2c_read_16bits(uint8_t slave_addr, uint8_t reg_addr, uint8_t *data) {
uint8_t state = I2C_START;
uint8_t read_cycle = 0;
uint16_t timeout = 0;
uint8_t i2c_timeout_flag = 0;
uint8_t number_of_byte = 2;
/* enable acknowledge */
i2c_ack_config(I2C0, I2C_ACK_ENABLE);
while (!(i2c_timeout_flag)) {
switch (state) {
case I2C_START:
if (RESET == read_cycle) {
/* i2c master sends start signal only when the bus is idle */
while (i2c_flag_get(I2C0, I2C_FLAG_I2CBSY) && (timeout < I2C_TIME_OUT)) {
timeout++;
}
if (timeout < I2C_TIME_OUT) {
/* whether to send ACK or not for the next byte */
i2c_ackpos_config(I2C0, I2C_ACKPOS_NEXT);
} else {
// i2c_bus_reset();
timeout = 0;
state = I2C_START;
#ifdef DEBUG_VERBOES
printf("i2c bus is busy in READ!\n");
#endif
}
}
/* send the start signal */
i2c_start_on_bus(I2C0);
timeout = 0;
state = I2C_SEND_ADDRESS;
break;
case I2C_SEND_ADDRESS:
/* i2c master sends START signal successfully */
while ((!i2c_flag_get(I2C0, I2C_FLAG_SBSEND)) && (timeout < I2C_TIME_OUT)) {
timeout++;
}
if (timeout < I2C_TIME_OUT) {
if (RESET == read_cycle) {
i2c_master_addressing(I2C0, slave_addr, I2C_TRANSMITTER);
state = I2C_CLEAR_ADDRESS_FLAG;
} else {
i2c_master_addressing(I2C0, slave_addr, I2C_RECEIVER);
i2c_ack_config(I2C0, I2C_ACK_DISABLE);
state = I2C_CLEAR_ADDRESS_FLAG;
}
timeout = 0;
} else {
timeout = 0;
state = I2C_START;
read_cycle = RESET;
#ifdef DEBUG_VERBOES
printf("i2c master sends start signal timeout in READ!\n");
#endif
}
break;
case I2C_CLEAR_ADDRESS_FLAG:
/* address flag set means i2c slave sends ACK */
while ((!i2c_flag_get(I2C0, I2C_FLAG_ADDSEND)) && (timeout < I2C_TIME_OUT)) {
timeout++;
}
if (timeout < I2C_TIME_OUT) {
i2c_flag_clear(I2C0, I2C_FLAG_ADDSEND);
if ((SET == read_cycle) && (1 == number_of_byte)) {
/* send a stop condition to I2C bus */
i2c_stop_on_bus(I2C0);
}
timeout = 0;
state = I2C_TRANSMIT_DATA;
} else {
timeout = 0;
state = I2C_START;
read_cycle = RESET;
#ifdef DEBUG_VERBOES
printf("i2c master clears address flag timeout in READ!\n");
#endif
}
break;
case I2C_TRANSMIT_DATA:
if (RESET == read_cycle) {
/* wait until the transmit data buffer is empty */
while ((!i2c_flag_get(I2C0, I2C_FLAG_TBE)) && (timeout < I2C_TIME_OUT)) {
timeout++;
}
if (timeout < I2C_TIME_OUT) {
/* send the EEPROM's internal address to write to : only one byte address */
i2c_data_transmit(I2C0, reg_addr);
timeout = 0;
} else {
timeout = 0;
state = I2C_START;
read_cycle = RESET;
#ifdef DEBUG_VERBOES
printf("i2c master wait data buffer is empty timeout in READ!\n");
#endif
}
/* wait until BTC bit is set */
while ((!i2c_flag_get(I2C0, I2C_FLAG_BTC)) && (timeout < I2C_TIME_OUT)) {
timeout++;
}
if (timeout < I2C_TIME_OUT) {
timeout = 0;
state = I2C_START;
read_cycle = SET;
} else {
timeout = 0;
state = I2C_START;
read_cycle = RESET;
#ifdef DEBUG_VERBOES
printf("i2c master sends register address timeout in READ!\n");
#endif
}
} else {
while (number_of_byte) {
timeout++;
if (2 == number_of_byte) {
/* wait until BTC bit is set */
while (!i2c_flag_get(I2C0, I2C_FLAG_BTC));
/* send a stop condition to I2C bus */
i2c_stop_on_bus(I2C0);
}
/* wait until RBNE bit is set */
if (i2c_flag_get(I2C0, I2C_FLAG_RBNE)) {
/* read a byte from the EEPROM */
*data = i2c_data_receive(I2C0);
/* point to the next location where the byte read will be saved */
data++;
/* decrement the read bytes counter */
number_of_byte--;
timeout = 0;
}
if (timeout > I2C_TIME_OUT) {
timeout = 0;
state = I2C_START;
read_cycle = 0;
#ifdef DEBUG_VERBOES
printf("i2c master sends data timeout in READ!\n");
#endif
}
}
timeout = 0;
state = I2C_STOP;
}
break;
case I2C_STOP:
/* i2c master sends STOP signal successfully */
while ((I2C_CTL0(I2C0) & I2C_CTL0_STOP) && (timeout < I2C_TIME_OUT)) {
timeout++;
}
if (timeout < I2C_TIME_OUT) {
timeout = 0;
state = I2C_END;
i2c_timeout_flag = I2C_OK;
} else {
timeout = 0;
state = I2C_START;
read_cycle = 0;
#ifdef DEBUG_VERBOES
printf("i2c master sends stop signal timeout in READ!\n");
#endif
}
break;
default:
state = I2C_START;
read_cycle = 0;
i2c_timeout_flag = I2C_OK;
timeout = 0;
#ifdef DEBUG_VERBOES
printf("i2c master sends start signal in READ.\n");
#endif
break;
}
}
return I2C_END;
}

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Src/soft_i2c.c Normal file
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//
// 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_us(20); // 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) {
// sda_out();
I2C_SCL_LOW();
I2C_SDA_LOW();
soft_i2c_delay();
I2C_SCL_HIGH();
soft_i2c_delay();
I2C_SDA_HIGH();
}
/*!
\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();
soft_i2c_delay();
I2C_SCL_HIGH();
soft_i2c_delay();
uint8_t ack = !I2C_SDA_READ();
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) {
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]) {
soft_i2c_start();
soft_i2c_send_byte(slave_addr);
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()){}
soft_i2c_stop();
return SOFT_I2C_OK;
}
uint8_t soft_i2c_read_16bits(uint8_t slave_addr, uint8_t reg_addr, uint8_t *data)
{
soft_i2c_start();
soft_i2c_send_byte(slave_addr);
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_start();
soft_i2c_send_byte(slave_addr | 0x01);
if (!soft_i2c_wait_ack()) {
soft_i2c_stop();
return SOFT_I2C_FAIL;
}
soft_i2c_delay();
data[0] = soft_i2c_receive_byte(1);
data[1] = soft_i2c_receive_byte(0);
soft_i2c_stop();
return SOFT_I2C_OK;
}