generated from hulk/gd32e23x_template
759 lines
26 KiB
C
759 lines
26 KiB
C
//
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// Created by dell on 24-12-3.
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//
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#include "LDC1612.h"
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/*!
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\brief configure the GPIO ports
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\param[in] none
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\param[out] none
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\retval none
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*/
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void i2c_gpio_config(void) {
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/* enable IIC GPIO clock */
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rcu_periph_clock_enable(RCU_GPIO_I2C);
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/* connect I2C_SCL_PIN to I2C_SCL */
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gpio_af_set(I2C_SCL_PORT, I2C_GPIO_AF, I2C_SCL_PIN);
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/* connect I2C_SDA_PIN to I2C_SDA */
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gpio_af_set(I2C_SDA_PORT, I2C_GPIO_AF, I2C_SDA_PIN);
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/* configure GPIO pins of I2C */
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gpio_mode_set(I2C_SCL_PORT, GPIO_MODE_AF, GPIO_PUPD_PULLUP, I2C_SCL_PIN);
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gpio_output_options_set(I2C_SCL_PORT, GPIO_OTYPE_OD, GPIO_OSPEED_50MHZ, I2C_SCL_PIN);
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gpio_mode_set(I2C_SDA_PORT, GPIO_MODE_AF, GPIO_PUPD_PULLUP, I2C_SDA_PIN);
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gpio_output_options_set(I2C_SDA_PORT, GPIO_OTYPE_OD, GPIO_OSPEED_50MHZ, I2C_SDA_PIN);
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}
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/*!
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\brief configure the I2CX interface
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\param[in] none
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\param[out] none
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\retval none
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*/
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void i2c_config(void) {
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/* enable I2C clock */
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rcu_periph_clock_enable(RCU_I2C);
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/* configure I2C clock */
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i2c_clock_config(I2C0, I2C_SPEED, I2C_DTCY_2);
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/* configure I2C address */
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i2c_mode_addr_config(I2C0, I2C_I2CMODE_ENABLE, I2C_ADDFORMAT_7BITS, LDC1612_ADDR);
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/* enable I2CX */
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i2c_enable(I2C0);
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/* enable acknowledge */
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i2c_ack_config(I2C0, I2C_ACK_ENABLE);
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}
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/*!
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\brief reset I2C bus
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\param[in] none
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\param[out] none
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\retval none
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*/
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void i2c_bus_reset(void) {
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i2c_deinit(I2C0);
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/* configure SDA/SCL for GPIO */
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GPIO_BC(I2C_SCL_PORT) |= I2C_SCL_PIN;
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GPIO_BC(I2C_SDA_PORT) |= I2C_SDA_PIN;
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gpio_output_options_set(I2C_SCL_PORT, GPIO_OTYPE_PP, GPIO_OSPEED_50MHZ, I2C_SCL_PIN);
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gpio_output_options_set(I2C_SDA_PORT, GPIO_OTYPE_PP, GPIO_OSPEED_50MHZ, I2C_SDA_PIN);
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__NOP();
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__NOP();
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__NOP();
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__NOP();
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__NOP();
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GPIO_BOP(I2C_SCL_PORT) |= I2C_SCL_PIN;
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__NOP();
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__NOP();
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__NOP();
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__NOP();
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__NOP();
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GPIO_BOP(I2C_SDA_PORT) |= I2C_SDA_PIN;
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/* connect I2C_SCL_PIN to I2C_SCL */
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/* connect I2C_SDA_PIN to I2C_SDA */
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gpio_output_options_set(I2C_SCL_PORT, GPIO_OTYPE_OD, GPIO_OSPEED_50MHZ, I2C_SCL_PIN);
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gpio_output_options_set(I2C_SDA_PORT, GPIO_OTYPE_OD, GPIO_OSPEED_50MHZ, I2C_SDA_PIN);
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/* configure the I2CX interface */
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i2c_config();
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}
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/**
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* @brief 扫描I2C总线，查找连接的设备
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*
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* 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。
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* 如果在某个地址上发现了设备，则会打印出该设备的地址。
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* 最后会打印出找到的设备总数。
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*/
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void i2c_scan(void) {
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uint32_t timeout;
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uint8_t address;
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int found_devices = 0;
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printf("Scanning I2C bus...\r\n");
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for (address = 1; address < 127; address++) {
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timeout = 0;
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// 生成起始条件
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while (i2c_flag_get(I2C0, I2C_FLAG_I2CBSY) && (timeout < I2C_TIME_OUT))
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timeout++;
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if (timeout >= I2C_TIME_OUT) {
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continue; // 超时，跳过该地址
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}
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i2c_start_on_bus(I2C0);
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timeout = 0;
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// 等待起始条件发送完成
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while (!i2c_flag_get(I2C0, I2C_FLAG_SBSEND) && (timeout < I2C_TIME_OUT))
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timeout++;
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if (timeout >= I2C_TIME_OUT) {
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continue; // 超时，跳过该地址
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}
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i2c_master_addressing(I2C0, (address << 1), I2C_TRANSMITTER);
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timeout = 0;
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// 等待地址发送完成
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while (!i2c_flag_get(I2C0, I2C_FLAG_ADDSEND) && (timeout < I2C_TIME_OUT))
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timeout++;
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if (timeout < I2C_TIME_OUT) {
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i2c_flag_clear(I2C0, I2C_FLAG_ADDSEND);
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printf("Found device at 0x%02X\r\n", address);
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found_devices++;
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}
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// 生成停止条件
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i2c_stop_on_bus(I2C0);
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timeout = 0;
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while (i2c_flag_get(I2C0, I2C_FLAG_STPDET) && (timeout < I2C_TIME_OUT))
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timeout++;
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}
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if (found_devices == 0) {
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printf("No I2C devices found.\r\n");
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} else {
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printf("Total %d I2C devices found.\r\n", found_devices);
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}
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}
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/** @brief set conversion interval time.
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@param channel LDC1612 has total two channels.
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@param result The value to be set.
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* */
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void ldc1612_set_conversion_time(uint8_t channel, uint16_t result) {
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uint8_t data[2] = {0};
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data[0] = (result >> 8) & 0xFF;
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data[1] = result & 0xFF;
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ldc1612_iic_write_16bits(SET_CONVERSION_TIME_REG_START + channel, data);
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}
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/** @brief set conversion offset.
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@param channel LDC1612 has total two channels.
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@param result The value to be set.
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* */
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void ldc1612_set_conversion_offset(uint8_t channel, uint16_t result) {
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uint8_t data[2] = {0};
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data[0] = (result >> 8) & 0xFF;
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data[1] = result & 0xFF;
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ldc1612_iic_write_16bits(SET_CONVERSION_OFFSET_REG_START + channel, data);
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}
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/** @brief Before conversion,wait LC sensor stabilize for a short time.
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@param channel LDC1612 has total two channels.
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@param result The value to be set.
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* */
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void ldc1612_set_LC_stabilize_time(uint8_t channel, uint16_t result) {
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uint8_t data[2] = {0};
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data[0] = (result >> 8) & 0xFF;
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data[1] = result & 0xFF;
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ldc1612_iic_write_16bits(SET_LC_STABILIZE_REG_START + channel, data);
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}
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/** @brief set input frequency divide and fref divide.
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@param channel LDC1612 has total two channels.
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@param FIN_DIV FIN input divide
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@param FREF_DIV fref,reference frequency of sensor.
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* */
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void ldc1612_set_freq_divide(uint8_t channel) {
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uint16_t value;
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uint16_t fin_div, freq_div;
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float sensor_freq;
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sensor_freq = 1 / (2 * 3.14 * sqrt(COIL_L_UH * COIL_C_PF * pow(10, -18))) * pow(10, -6);
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fin_div = (uint16_t) (sensor_freq / 8.75 + 1);
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if (fin_div * 4 < 40) {
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freq_div = 2;
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} else {
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freq_div = 4;
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}
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value = fin_div << 12;
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value |= freq_div;
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// printf("\tvalue: 0x%x\r\n", value);
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uint8_t data[2] = {0};
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data[0] = (value >> 8) & 0xFF;
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data[1] = value & 0xFF;
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// printf("\tFIN_DIV: %d, FREF_DIV: %d\r\n", fin_div, freq_div);
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ldc1612_iic_write_16bits(SET_FREQ_REG_START + channel, data);
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}
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/** @brief Error output config.
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@param result The value to be set.
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* */
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void ldc1612_set_error_config(uint16_t value) {
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uint8_t data[2] = {0};
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data[0] = (value >> 8) & 0xFF;
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data[1] = value & 0xFF;
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ldc1612_iic_write_16bits(ERROR_CONFIG_REG, data);
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}
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/** @brief mux config.
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@param result The value to be set.
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* */
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void ldc1612_set_mux_config(uint16_t value) {
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uint8_t data[2] = {0};
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data[0] = (value >> 8) & 0xFF;
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data[1] = value & 0xFF;
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ldc1612_iic_write_16bits(MUL_CONFIG_REG, data);
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}
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/** @brief reset sensor.
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* */
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void ldc1612_reset_sensor(void) {
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uint8_t data[2] = {0};
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data[0] = 0x80;
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data[1] = 0x00;
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ldc1612_iic_write_16bits(SENSOR_RESET_REG, data);
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}
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/** @brief set drive current of sensor.
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@param result The value to be set.
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* */
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void ldc1612_set_drive_current(uint8_t channel, uint16_t value) {
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uint8_t data[2] = {0};
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data[0] = (value >> 8) & 0xFF;
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data[1] = value & 0xFF;
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ldc1612_iic_write_16bits(SET_DRIVER_CURRENT_REG + channel, data);
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}
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/** @brief Main config part of sensor.Contains select channel、start conversion、sleep mode、sensor activation mode、INT pin disable ..
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@param result The value to be set.
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* */
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void ldc1612_set_sensor_config(uint16_t value) {
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uint8_t data[2] = {0};
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data[0] = (value >> 8) & 0xFF;
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data[1] = value & 0xFF;
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ldc1612_iic_write_16bits(SENSOR_CONFIG_REG, data);
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}
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void ldc1612_single_ch0_config(void) {
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ldc1612_set_freq_divide(CHANNEL_0); //0x14 --0x1002
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ldc1612_set_LC_stabilize_time(CHANNEL_0, LC_STABILIZE_TIME_CH0); //0x10 --0x001E
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ldc1612_set_conversion_time(CHANNEL_0, LDC1612_CONVERSION_TIME_CH0); //0x08 --0x0546
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ldc1612_set_error_config(LDC1612_ERROR_CONFIG); //0x19 --0x0000)
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ldc1612_set_drive_current(CHANNEL_0, LDC1612_DRIVE_CURRENT); //0x1E --0x9000
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ldc1612_set_mux_config(LDC1612_MUX_CONFIG); //0x1B --0x020C
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ldc1612_set_sensor_config(LDC1612_SENSOR_CONFIG); //0x1A --0x1601
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}
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void ldc1612_iic_get_sensor_infomation(void) {
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uint8_t data[2] = {0};
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ldc1612_iic_read_16bits(READ_MANUFACTURER_ID, data);
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printf("\tManufacturer: 0x%x\r\n", (data[0] << 8) | data[1]);
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ldc1612_iic_read_16bits(READ_DEVICE_ID, data);
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printf("\tDevice: 0x%x\r\n", (data[0] << 8) | data[1]);
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}
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uint16_t ldc1612_get_manufacturer_id(void) {
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uint8_t data[2] = {0};
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ldc1612_iic_read_16bits(READ_MANUFACTURER_ID, data);
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return (data[0] << 8) | data[1];
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}
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uint16_t ldc1612_get_deveice_id(void) {
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uint8_t data[2] = {0};
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ldc1612_iic_read_16bits(READ_DEVICE_ID, data);
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return (data[0] << 8) | data[1];
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}
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/** @brief read the raw channel result from register.
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@param channel LDC1612 has total two channels.
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@param result raw data
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* */
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uint32_t ldc1612_get_raw_channel_result(uint8_t channel) {
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uint32_t raw_value = 0;
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uint8_t value[2] = {0};
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ldc1612_iic_read_16bits(CONVERTION_RESULT_REG_START + channel, value);
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raw_value |= (uint32_t) ((value[0] << 8) | value[1]) << 16;
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ldc1612_iic_read_16bits(CONVERTION_RESULT_REG_START + channel + 1, value);
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raw_value |= (uint32_t) ((value[0] << 8) | value[1]);
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return ldc1612_parse_raw_result(raw_value);
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}
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/** @brief parse the data which read from data register.
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@param channel LDC1612 has total two channels.
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@param raw_result the raw data which read from data register,it contains error codes and sensor value;
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* */
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uint32_t ldc1612_parse_raw_result(uint32_t raw_result) {
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uint32_t calibration_value = 0;
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uint8_t error_code = 0;
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calibration_value = raw_result & 0x0FFFFFFF;
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if (0xFFFFFFF == calibration_value) {
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return 0xF0000000;
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// ERR_NC-No coil detected!!!
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}
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error_code = raw_result >> 24;
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if (error_code & 0x80) {
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return 0x80000000;
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// ERR_UR-Under range error!!!
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}
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if (error_code & 0x40) {
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return 0x40000000;
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// ERR_OR-Over range error!!!
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}
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if (error_code & 0x20) {
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return 0x20000000;
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// ERR_WD-Watch dog timeout error!!!
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}
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if (error_code & 0x10) {
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return 0x10000000;
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// ERR_AE-error!!!
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}
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return raw_result;
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}
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uint8_t ldc1612_iic_read_16bits(uint8_t reg_addr, uint8_t *data) {
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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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uint8_t number_of_byte = 2;
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/* enable acknowledge */
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i2c_ack_config(I2C0, I2C_ACK_ENABLE);
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while (!(i2c_timeout_flag)) {
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switch (state) {
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case I2C_START:
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if (RESET == read_cycle) {
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/* i2c master sends start signal only when the bus is idle */
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while (i2c_flag_get(I2C0, 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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/* whether to send ACK or not for the next byte */
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i2c_ackpos_config(I2C0, I2C_ACKPOS_NEXT);
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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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delay_us(5);
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i2c_start_on_bus(I2C0);
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timeout = 0;
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state = I2C_SEND_ADDRESS;
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break;
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case I2C_SEND_ADDRESS:
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/* i2c master sends START signal successfully */
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while ((!i2c_flag_get(I2C0, I2C_FLAG_SBSEND)) && (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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if (RESET == read_cycle) {
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i2c_master_addressing(I2C0, LDC1612_ADDR, I2C_TRANSMITTER);
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state = I2C_CLEAR_ADDRESS_FLAG;
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} else {
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i2c_master_addressing(I2C0, LDC1612_ADDR, I2C_RECEIVER);
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i2c_ack_config(I2C0, I2C_ACK_DISABLE);
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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 = RESET;
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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(I2C0, 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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i2c_flag_clear(I2C0, I2C_FLAG_ADDSEND);
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if ((SET == read_cycle) && (1 == number_of_byte)) {
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/* send a stop condition to I2C bus */
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i2c_stop_on_bus(I2C0);
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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 = RESET;
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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(I2C0, 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(I2C0, reg_addr);
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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 = RESET;
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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(I2C0, I2C_FLAG_BTC)) && (timeout < I2C_TIME_OUT)) {
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timeout++;
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|
}
|
|
if (timeout < I2C_TIME_OUT) {
|
|
timeout = 0;
|
|
state = I2C_START;
|
|
read_cycle = SET;
|
|
} else {
|
|
timeout = 0;
|
|
state = I2C_START;
|
|
read_cycle = RESET;
|
|
printf("i2c master sends register address timeout in READ!\n");
|
|
}
|
|
} 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;
|
|
printf("i2c master sends data timeout in READ!\n");
|
|
}
|
|
}
|
|
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;
|
|
printf("i2c master sends stop signal timeout in READ!\n");
|
|
}
|
|
break;
|
|
default:
|
|
state = I2C_START;
|
|
read_cycle = 0;
|
|
i2c_timeout_flag = I2C_OK;
|
|
timeout = 0;
|
|
printf("i2c master sends start signal in READ.\n");
|
|
break;
|
|
}
|
|
}
|
|
return I2C_END;
|
|
}
|
|
|
|
uint8_t ldc1612_iic_write_16bits(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;
|
|
printf("i2c bus is busy in WRITE BYTE!\n");
|
|
}
|
|
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, LDC1612_ADDR, I2C_TRANSMITTER);
|
|
timeout = 0;
|
|
state = I2C_CLEAR_ADDRESS_FLAG;
|
|
} else {
|
|
timeout = 0;
|
|
state = I2C_START;
|
|
printf("i2c master sends start signal timeout in WRITE BYTE!\n");
|
|
}
|
|
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;
|
|
printf("i2c master clears address flag timeout in WRITE BYTE!\n");
|
|
}
|
|
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;
|
|
printf("i2c master sends data timeout in WRITE BYTE!\n");
|
|
}
|
|
|
|
/* 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;
|
|
printf("i2c master sends MSB data timeout in WRITE BYTE!\n");
|
|
}
|
|
|
|
/* 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;
|
|
printf("i2c master sends LSB data timeout in WRITE BYTE!\n");
|
|
}
|
|
|
|
/* 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;
|
|
printf("i2c master sends data timeout in WRITE BYTE!\n");
|
|
}
|
|
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;
|
|
printf("i2c master sends stop signal timeout in WRITE BYTE!\n");
|
|
}
|
|
break;
|
|
default:
|
|
state = I2C_START;
|
|
i2c_timeout_flag = I2C_OK;
|
|
timeout = 0;
|
|
printf("i2c master sends start signal in WRITE BYTE.\n");
|
|
break;
|
|
}
|
|
}
|
|
return I2C_END;
|
|
}
|
|
|
|
uint32_t TMP112A_ReadTemperature(void) {
|
|
uint8_t data[2] = {0};
|
|
uint16_t raw_temp = 0;
|
|
uint16_t timeout = 0;
|
|
uint32_t temperature = 0;
|
|
|
|
i2c_ack_config(I2C0, I2C_ACK_ENABLE);
|
|
|
|
while (i2c_flag_get(I2C0, I2C_FLAG_I2CBSY) && (timeout < I2C_TIME_OUT)) //判断IIC总线是否忙，发送起始信号
|
|
timeout++;
|
|
if (timeout < I2C_TIME_OUT) {
|
|
i2c_start_on_bus(I2C0);
|
|
timeout = 0;
|
|
} else {
|
|
printf("err\r\n");
|
|
return -1; // 超时返回错误
|
|
}
|
|
|
|
while (!i2c_flag_get(I2C0, I2C_FLAG_SBSEND) && (timeout < I2C_TIME_OUT)) //判断起始位是否发送，设置sensor地址并设置为写
|
|
timeout++;
|
|
if (timeout < I2C_TIME_OUT) {
|
|
i2c_master_addressing(I2C0, TMP112A_ADDR, I2C_TRANSMITTER);
|
|
timeout = 0;
|
|
} else {
|
|
return -1; // 超时返回错误
|
|
}
|
|
|
|
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;
|
|
} else {
|
|
return -1; // 超时返回错误
|
|
}
|
|
|
|
while (!i2c_flag_get(I2C0, I2C_FLAG_TBE) && (timeout < I2C_TIME_OUT)) //判断地址是否发送完成，然后发送寄存器地址
|
|
timeout++;
|
|
if (timeout < I2C_TIME_OUT) {
|
|
i2c_data_transmit(I2C0, 0x00);
|
|
timeout = 0;
|
|
// i2c_start_on_bus(I2C0);
|
|
} else {
|
|
return -1; // 超时返回错误
|
|
}
|
|
|
|
while (i2c_flag_get(I2C0, I2C_FLAG_BTC) && (timeout < I2C_TIME_OUT)) //判断发送缓冲器是否为空，为空后（发送完毕）重新发送开始信号
|
|
timeout++;
|
|
if (timeout < I2C_TIME_OUT) {
|
|
i2c_start_on_bus(I2C0);
|
|
timeout = 0;
|
|
} else {
|
|
return -1; // 超时返回错误
|
|
}
|
|
|
|
while (!i2c_flag_get(I2C0, I2C_FLAG_SBSEND) && (timeout < I2C_TIME_OUT)) {
|
|
timeout++;
|
|
}
|
|
if (timeout < I2C_TIME_OUT) {
|
|
i2c_master_addressing(I2C0, TMP112A_ADDR, I2C_RECEIVER);
|
|
timeout = 0;
|
|
} else {
|
|
return -1; // 超时返回错误
|
|
}
|
|
|
|
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;
|
|
} else {
|
|
return -1; // 超时返回错误
|
|
}
|
|
|
|
// 读取第一个字节的数据
|
|
while (!i2c_flag_get(I2C0, I2C_FLAG_RBNE) && (timeout < I2C_TIME_OUT)) {
|
|
timeout++;
|
|
}
|
|
if (timeout < I2C_TIME_OUT) {
|
|
data[0] = i2c_data_receive(I2C0);
|
|
timeout = 0;
|
|
} else {
|
|
return -1; // 超时返回错误
|
|
}
|
|
|
|
i2c_ack_config(I2C0, I2C_ACK_DISABLE); // 关闭发送ACK，它会在下一个字节完成后发送NAK
|
|
|
|
// 读取第二个字节的数据
|
|
while (!i2c_flag_get(I2C0, I2C_FLAG_RBNE) && (timeout < I2C_TIME_OUT)) {
|
|
timeout++;
|
|
}
|
|
if (timeout < I2C_TIME_OUT) {
|
|
data[1] = i2c_data_receive(I2C0);
|
|
timeout = 0;
|
|
} else {
|
|
return -1; // 超时返回错误
|
|
}
|
|
|
|
i2c_stop_on_bus(I2C0);
|
|
|
|
// printf("data[0]: %x, data[1]: %x\r\n", data[0], data[1]);
|
|
raw_temp = ((uint16_t) (data[0] << 4) | (data[1]>>4));
|
|
// printf("raw_temp: %x\r\n", raw_temp);
|
|
// printf("raw_temp(dec): %d\r\n", raw_temp);
|
|
temperature = raw_temp * 625;
|
|
// printf("temperature: %d\r\n", temperature);
|
|
|
|
return temperature;
|
|
}
|