hal库模拟iic读取bh1750
时间: 2023-10-01 09:08:17 浏览: 61
以下是使用HAL库模拟I2C读取BH1750传感器的示例代码:
```c
#include "main.h"
#include "stdio.h"
#include "stdlib.h"
#include "string.h"
#define BH1750_ADDR 0x23 // BH1750地址
#define BH1750_ON 0x01 // BH1750开启命令
#define BH1750_OFF 0x00 // BH1750关闭命令
#define BH1750_CONT_H_RES_MODE 0x10 // BH1750连续高分辨率模式命令
#define BH1750_MTREG_DEFAULT 69 // BH1750默认测量时间寄存器值
I2C_HandleTypeDef hi2c1; // I2C句柄
void SystemClock_Config(void);
static void MX_GPIO_Init(void);
static void MX_I2C1_Init(void);
void BH1750_ON_CMD(void);
void BH1750_OFF_CMD(void);
void BH1750_CONT_H_RES_MODE_CMD(void);
void BH1750_Set_MTREG(uint8_t MTREG);
uint16_t BH1750_Read_Lux(void);
int main(void) {
HAL_Init();
SystemClock_Config();
MX_GPIO_Init();
MX_I2C1_Init();
BH1750_Set_MTREG(BH1750_MTREG_DEFAULT);
BH1750_ON_CMD();
BH1750_CONT_H_RES_MODE_CMD();
while (1) {
uint16_t lux = BH1750_Read_Lux();
printf("Lux: %d\n", lux);
HAL_Delay(1000);
}
}
void BH1750_ON_CMD(void) {
uint8_t cmd = BH1750_ON;
HAL_I2C_Master_Transmit(&hi2c1, BH1750_ADDR << 1, &cmd, 1, 100);
}
void BH1750_OFF_CMD(void) {
uint8_t cmd = BH1750_OFF;
HAL_I2C_Master_Transmit(&hi2c1, BH1750_ADDR << 1, &cmd, 1, 100);
}
void BH1750_CONT_H_RES_MODE_CMD(void) {
uint8_t cmd = BH1750_CONT_H_RES_MODE;
HAL_I2C_Master_Transmit(&hi2c1, BH1750_ADDR << 1, &cmd, 1, 100);
}
void BH1750_Set_MTREG(uint8_t MTREG) {
uint8_t cmd[2];
cmd[0] = 0x40;
cmd[1] = MTREG;
HAL_I2C_Master_Transmit(&hi2c1, BH1750_ADDR << 1, cmd, 2, 100);
}
uint16_t BH1750_Read_Lux(void) {
uint8_t data[2];
HAL_I2C_Master_Receive(&hi2c1, BH1750_ADDR << 1, data, 2, 100);
uint16_t lux = (data[0] << 8) | data[1];
lux /= 1.2;
return lux;
}
void SystemClock_Config(void) {
RCC_OscInitTypeDef RCC_OscInitStruct = {0};
RCC_ClkInitTypeDef RCC_ClkInitStruct = {0};
/** Configure the main internal regulator output voltage
*/
__HAL_RCC_PWR_CLK_ENABLE();
__HAL_PWR_VOLTAGESCALING_CONFIG(PWR_REGULATOR_VOLTAGE_SCALE1);
/** Initializes the RCC Oscillators according to the specified parameters
* in the RCC_OscInitTypeDef structure.
*/
RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_HSI;
RCC_OscInitStruct.HSIState = RCC_HSI_ON;
RCC_OscInitStruct.HSICalibrationValue = RCC_HSICALIBRATION_DEFAULT;
RCC_OscInitStruct.PLL.PLLState = RCC_PLL_NONE;
if (HAL_RCC_OscConfig(&RCC_OscInitStruct) != HAL_OK) {
Error_Handler();
}
/** Initializes the CPU, AHB and APB buses clocks
*/
RCC_ClkInitStruct.ClockType = RCC_CLOCKTYPE_HCLK | RCC_CLOCKTYPE_SYSCLK |
RCC_CLOCKTYPE_PCLK1 | RCC_CLOCKTYPE_PCLK2;
RCC_ClkInitStruct.SYSCLKSource = RCC_SYSCLKSOURCE_HSI;
RCC_ClkInitStruct.AHBCLKDivider = RCC_SYSCLK_DIV1;
RCC_ClkInitStruct.APB1CLKDivider = RCC_HCLK_DIV1;
RCC_ClkInitStruct.APB2CLKDivider = RCC_HCLK_DIV1;
if (HAL_RCC_ClockConfig(&RCC_ClkInitStruct, FLASH_LATENCY_0) != HAL_OK) {
Error_Handler();
}
}
static void MX_I2C1_Init(void) {
hi2c1.Instance = I2C1;
hi2c1.Init.Timing = 0x00303D5B;
hi2c1.Init.OwnAddress1 = 0;
hi2c1.Init.AddressingMode = I2C_ADDRESSINGMODE_7BIT;
hi2c1.Init.DualAddressMode = I2C_DUALADDRESS_DISABLE;
hi2c1.Init.OwnAddress2 = 0;
hi2c1.Init.OwnAddress2Masks = I2C_OA2_NOMASK;
hi2c1.Init.GeneralCallMode = I2C_GENERALCALL_DISABLE;
hi2c1.Init.NoStretchMode = I2C_NOSTRETCH_DISABLE;
if (HAL_I2C_Init(&hi2c1) != HAL_OK) {
Error_Handler();
}
if (HAL_I2CEx_ConfigAnalogFilter(&hi2c1, I2C_ANALOGFILTER_ENABLE) !=
HAL_OK) {
Error_Handler();
}
if (HAL_I2CEx_ConfigDigitalFilter(&hi2c1, 0) != HAL_OK) {
Error_Handler();
}
}
static void MX_GPIO_Init(void) {
GPIO_InitTypeDef GPIO_InitStruct = {0};
__HAL_RCC_GPIOA_CLK_ENABLE();
HAL_GPIO_WritePin(GPIOA, GPIO_PIN_9 | GPIO_PIN_10, GPIO_PIN_RESET);
GPIO_InitStruct.Pin = GPIO_PIN_9 | GPIO_PIN_10;
GPIO_InitStruct.Mode = GPIO_MODE_AF_OD;
GPIO_InitStruct.Pull = GPIO_NOPULL;
GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_HIGH;
GPIO_InitStruct.Alternate = GPIO_AF4_I2C1;
HAL_GPIO_Init(GPIOA, &GPIO_InitStruct);
}
void Error_Handler(void) {
__disable_irq();
while (1) {
}
}
```
在上面的代码中,我们使用了STM32的I2C1接口来模拟I2C通讯,通过HAL库提供的函数来实现对BH1750传感器的控制和读取。具体来说:
- `BH1750_ON_CMD()`函数用于发送BH1750开启命令。
- `BH1750_OFF_CMD()`函数用于发送BH1750关闭命令。
- `BH1750_CONT_H_RES_MODE_CMD()`函数用于发送BH1750连续高分辨率模式命令。
- `BH1750_Set_MTREG()`函数用于设置BH1750测量时间寄存器的值。
- `BH1750_Read_Lux()`函数用于读取BH1750传感器的光强数据。
需要注意的是,在使用I2C通讯时,需要先通过`HAL_I2C_Master_Transmit()`函数发送命令给从设备,再通过`HAL_I2C_Master_Receive()`函数读取从设备的响应数据。此外,在读取BH1750传感器的数据时,需要将读取到的数据除以1.2,得到光强值。