修改mlx90614，未完成
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parent
00dfdc4c8f
commit
752c2a7ea2
260
src/mlx90614.c
260
src/mlx90614.c
@ -7,7 +7,8 @@
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#include "systick.h"
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#include <stdio.h>
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void i2c_config(void) {
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void i2c_config(void)
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{
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rcu_periph_clock_enable(RCU_IR_GPIO);
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rcu_periph_clock_enable(RCU_I2C);
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@ -27,192 +28,81 @@ void i2c_config(void) {
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i2c_ack_config(IR_I2C, I2C_ACK_ENABLE);
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}
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uint32_t read_ir_mlx90614(void) {
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uint8_t Data[5];
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uint32_t read_ir_mlx90614(void)
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{
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uint8_t Data[3] = {0};
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uint32_t inttemp_ir = 0;
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uint32_t TIMEOUT = 0;
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uint8_t state = I2C_START;
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uint8_t read_cycle = 0;
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uint16_t timeout = 0;
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uint8_t i2c_timeout_flag = 0;
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i2c_ack_config(IR_I2C, I2C_ACK_ENABLE);
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while (!(i2c_timeout_flag))
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{
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switch (state)
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{
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case I2C_START:
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if(RESET == read_cycle)
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{
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/* i2c master sends start signal only when the bus is idle */
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while (i2c_flag_get(IR_I2C, I2C_FLAG_I2CBSY) && (timeout < i2c_timeout_flag))
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{
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timeout ++;
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}
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if(timeout < I2C_TIME_OUT)
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{
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/* whether to send ACK or not for the next byte */
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if(2 == RegisterLen) {
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i2c_ackpos_config(IR_I2C, I2C_ACKPOS_NEXT);
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}
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} else {
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i2c_bus_reset();
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timeout = 0;
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state = I2C_START;
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printf("i2c bus is busy in READ!\n");
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}
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}
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/* send the start signal */
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i2c_start_on_bus(IR_I2C);
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timeout = 0;
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state = I2C_SEND_ADDR;
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break;
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case I2C_SEND_ADDR:
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/* i2c master sends START signal successfully */
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while((!i2c_flag_get(IR_I2C, I2C_FLAG_SBSEND)) && (timeout < I2C_TIME_OUT))
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{
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timeout++;
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}
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if(timeout < I2C_TIME_OUT)
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{
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if(RESET == read_cycle)
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{
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i2c_master_addressing(IR_I2C, SLAVE_ADDR, I2C_TRANSMITTER);
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state = I2C_CLEAR_ADDRESS_FLAG;
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} else {
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i2c_master_addressing(IR_I2C, SLAVE_ADDR, I2C_RECEIVER);
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if(RegisterLen < 3) {
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/* disable acknowledge */
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i2c_ack_config(IR_I2C, I2C_ACK_DISABLE);
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}
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state = I2C_CLEAR_ADDRESS_FLAG;
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}
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timeout = 0;
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} else {
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timeout = 0;
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state = I2C_START;
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read_cycle = 0;
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printf("i2c master sends start signal timeout in READ!\n");
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}
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break;
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case I2C_CLEAR_ADDRESS_FLAG:
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/* address flag set means i2c slave sends ACK */
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while((!i2c_flag_get(IR_I2C, I2C_FLAG_ADDSEND)) && (timeout < I2C_TIME_OUT))
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{
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timeout++;
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}
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if(timeout < I2C_TIME_OUT)
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{
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i2c_flag_clear(IR_I2C, I2C_FLAG_ADDSEND);
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if((SET == read_cycle) && (1 == RegisterLen)) {
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/* send a stop condition to I2C bus */
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i2c_stop_on_bus(IR_I2C);
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}
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timeout = 0;
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state = I2C_TRANSMIT_DATA;
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} else {
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timeout = 0;
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state = I2C_START;
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read_cycle = 0;
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printf("i2c master clears address flag timeout in READ!\n");
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}
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break;
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case I2C_TRANSMIT_DATA:
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if(RESET == read_cycle) {
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/* wait until the transmit data buffer is empty */
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while((!i2c_flag_get(IR_I2C, I2C_FLAG_TBE)) && (timeout < I2C_TIME_OUT)) {
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timeout++;
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}
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if(timeout < I2C_TIME_OUT) {
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/* send the EEPROM's internal address to write to : only one byte address */
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i2c_data_transmit(IR_I2C, RegisterAddr);
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timeout = 0;
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} else {
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timeout = 0;
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state = I2C_START;
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read_cycle = 0;
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printf("i2c master wait data buffer is empty timeout in READ!\n");
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}
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/* wait until BTC bit is set */
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while((!i2c_flag_get(IR_I2C, I2C_FLAG_BTC)) && (timeout < I2C_TIME_OUT)) {
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timeout++;
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}
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if(timeout < I2C_TIME_OUT) {
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timeout = 0;
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state = I2C_START;
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read_cycle++;
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} else {
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timeout = 0;
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state = I2C_START;
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read_cycle = 0;
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printf("i2c master sends i2c_master_read_register1 internal address timeout in READ!\n");
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}
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} else {
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while(RegisterLen) {
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timeout++;
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if(3 == RegisterLen) {
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/* wait until BTC bit is set */
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while(!i2c_flag_get(IR_I2C, I2C_FLAG_BTC));
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/* disable acknowledge */
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i2c_ack_config(IR_I2C, I2C_ACK_DISABLE);
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}
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if(2 == RegisterLen) {
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/* wait until BTC bit is set */
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while(!i2c_flag_get(IR_I2C, I2C_FLAG_BTC));
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/* send a stop condition to I2C bus */
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i2c_stop_on_bus(IR_I2C);
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}
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/* wait until RBNE bit is set */
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if(i2c_flag_get(IR_I2C, I2C_FLAG_RBNE)) {
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/* read a byte from the EEPROM */
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*RegisterValue = i2c_data_receive(IR_I2C);
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/* point to the next location where the byte read will be saved */
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RegisterValue++;
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/* decrement the read bytes counter */
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RegisterLen--;
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timeout = 0;
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}
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if(timeout > I2C_TIME_OUT) {
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timeout = 0;
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state = I2C_START;
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read_cycle = 0;
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printf("i2c master sends data timeout in READ!\n");
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}
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}
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timeout = 0;
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state = I2C_STOP;
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}
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break;
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case I2C_STOP:
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/* i2c master sends STOP signal successfully */
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while((I2C_CTL0(IR_I2C) & I2C_CTL0_STOP) && (timeout < I2C_TIME_OUT)) {
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timeout++;
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}
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if(timeout < I2C_TIME_OUT) {
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timeout = 0;
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state = I2C_END;
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i2c_timeout_flag = I2C_OK;
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} else {
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timeout = 0;
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state = I2C_START;
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read_cycle = 0;
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printf("i2c master sends stop signal timeout in READ!\n");
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}
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break;
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default:
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state = I2C_START;
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read_cycle = 0;
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i2c_timeout_flag = I2C_OK;
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timeout = 0;
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printf("i2c master sends start signal in READ.\n");
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break;
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}
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// 发送起始信号
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i2c_start_on_bus(IR_I2C);
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while(i2c_flag_get(IR_I2C, I2C_FLAG_I2CBSY) && (timeout < I2C_TIME_OUT)) {
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timeout++;
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}
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return IIC_SUCCESS;
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if (timeout >= I2C_TIME_OUT) {
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return -41001; // 超时返回错误
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}
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// 发送从机地址和写操作位
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i2c_master_addressing(IR_I2C, SLAVE_ADDR, I2C_TRANSMITTER);
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while(!i2c_flag_get(IR_I2C, I2C_FLAG_ADDSEND) && (timeout < I2C_TIME_OUT)) {
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timeout++;
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}
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if (timeout >= I2C_TIME_OUT) {
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return -41002; // 超时返回错误
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}
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i2c_flag_clear(IR_I2C, I2C_FLAG_ADDSEND);
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// 发送寄存器地址
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i2c_data_transmit(IR_I2C, REG_ADDR_OBJ_TEMP);
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while(!i2c_flag_get(IR_I2C, I2C_FLAG_TBE) && (timeout < I2C_TIME_OUT)) {
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timeout++;
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}
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if (timeout >= I2C_TIME_OUT) {
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return -41003; // 超时返回错误
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}
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// 重复起始信号
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i2c_start_on_bus(IR_I2C);
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while(i2c_flag_get(IR_I2C, I2C_FLAG_I2CBSY) && (timeout < I2C_TIME_OUT)) {
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timeout++;
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}
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if (timeout >= I2C_TIME_OUT) {
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return -41004; // 超时返回错误
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}
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// 发送从机地址和读操作位
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i2c_master_addressing(IR_I2C, SLAVE_ADDR, I2C_RECEIVER);
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while(!i2c_flag_get(IR_I2C, I2C_FLAG_ADDSEND) && (timeout < I2C_TIME_OUT)) {
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timeout++;
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}
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if (timeout >= I2C_TIME_OUT) {
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return -41005; // 超时返回错误
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}
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i2c_flag_clear(IR_I2C, I2C_FLAG_ADDSEND);
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// 读取数据
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for (int i = 0; i < 3; i++) {
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while(!i2c_flag_get(IR_I2C, I2C_FLAG_RBNE) && (timeout < I2C_TIME_OUT)) {
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timeout++;
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}
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if (timeout >= I2C_TIME_OUT) {
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return -41006; // 超时返回错误
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}
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Data[i] = i2c_data_receive(IR_I2C);
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if (i < 2) {
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i2c_ack_config(IR_I2C, I2C_ACK_ENABLE);
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} else {
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i2c_ack_config(IR_I2C, I2C_ACK_DISABLE);
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}
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timeout = 0;
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}
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// 发送停止信号
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i2c_stop_on_bus(IR_I2C);
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// 计算温度
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inttemp_ir = ((uint16_t)(Data[1] << 8) | Data[0]) * 2 -27315;
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return inttemp_ir; // 返回温度值
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}
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