122 lines
2.7 KiB
C
122 lines
2.7 KiB
C
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/*************************************************
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Copyright (c) 2025, 成都赛联科技有限责任公司
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All rights reserved.
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@file drv_i2c.C
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@brief drv_i2c驱动程序
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@details
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@note
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@author dufresne
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@date 2025/09/24
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@version v1.0 2025/09/24 初始版本
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*************************************************/
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#include "drv_i2c.h"
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#include "rtthread.h"
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#include <core_cm4.h>
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/*
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@ brief 延时函数
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@ param
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@ return
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@ note 2025-09-15
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*/
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static void delay_us(int us)
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{
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rt_thread_udelay(us);
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}
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void i2c_init(void)
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{
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i2c_gpio_config();
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i2c_config();
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}
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/*
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@ brief 初始化tmp75芯片GPIO引脚
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@ param
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@ return
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@ note 2025-09-15
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*/
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void i2c_gpio_config(void)
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{
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// 配置引脚时钟
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rcu_periph_clock_enable(RCU_GPIOB);
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gpio_af_set(GPIOB, GPIO_AF_4, I2C_SCL_PIN | I2C_SDA_PIN);
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/* 初始化GPIO复用功能模式 */
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gpio_mode_set(GPIOB, GPIO_MODE_AF, GPIO_PUPD_PULLUP, I2C_SCL_PIN | I2C_SDA_PIN);
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gpio_output_options_set(GPIOB, GPIO_OTYPE_OD, GPIO_OSPEED_50MHZ, I2C_SCL_PIN | I2C_SDA_PIN);
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}
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void i2c_config(void)
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{
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// 启用 I2C 外设的时钟
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rcu_periph_clock_enable(RCU_I2C0);
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// 配置 I2C 的时钟参数：
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// I2C_PERIPH：这里使用的I2C1
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// I2C_SPEED：通信速率（单位为 Hz，常用为 100000 或 400000），这里使用100000
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i2c_clock_config(I2C_PERIPH, I2C_SPEED, I2C_DTCY_2);
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// 配置 I2C 工作模式和地址：
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// I2C_ADDFORMAT_7BITS：使用 7 位地址模式
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// I2C_BUS_ADDRESS：SD2068器件代码0110010 = 0x32
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i2c_mode_addr_config(I2C_PERIPH, I2C_I2CMODE_ENABLE, I2C_ADDFORMAT_7BITS, I2C_BUS_ADDRESS);
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// 启用 I2C 外设
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i2c_enable(I2C_PERIPH);
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// 使能 ACK 应答功能，确保在接收数据后自动发送 ACK
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i2c_ack_config(I2C_PERIPH, I2C_ACK_ENABLE);
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}
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/*
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@ brief 读取温度值
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@ param
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@ return
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@ note 2025-09-15
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*/
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float tmp75_read_temp(void)
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{
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uint8_t tempH = 0;
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uint8_t tempL = 0;
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uint16_t tempCode = 0;
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float temp = 0;
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// 起始信号
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i2c_start();
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// 写tmp75地址
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tmp75_write_byte(TMP75_ADDRESS);
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// 接收tmp75的ack信息
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tmp75_ack();
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// 发送需读取数据的地址
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tmp75_write_byte(TEMP_REGISTER_ADDRESS);
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tmp75_ack();
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i2c_start();
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// 写tmp75地址
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tmp75_write_byte(TMP75_ADDRESS + 1); // 读地址数据
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tmp75_ack();
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tempH = tmp75_read_byte();
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master_ack();
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tempL = tmp75_read_byte();
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master_noack();
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i2c_stop();
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tempCode = (tempH << 8) | tempL;
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tempCode = tempCode >> 6;
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if (tempCode & 0x200) // 负温度
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{
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tempCode &= 0x1ff;
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temp = ((float)tempCode - 512) / 4;
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}
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else
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{
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temp = (float)tempCode / 4;
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}
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TMP75_SDA_LOW;
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TMP75_SCL_LOW;
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return (temp);
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}
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