stm32读取LIS3DH
时间: 2024-12-19 10:06:29 浏览: 6
STM32L0-IIC-LIS3DH-FIFO模式读取
STM32读取LIS3DH加速度传感器可以通过I2C或SPI接口进行通信。以下是一个基本的步骤指南,帮助你在STM32上读取LIS3DH传感器的数据:
### 硬件连接
1. **I2C连接**:
- LIS3DH的SCL引脚连接到STM32的I2C时钟线(如PB6)。
- LIS3DH的SDA引脚连接到STM32的I2C数据线(如PB7)。
- LIS3DH的VDD和GND分别连接到STM32的3.3V和GND。
2. **SPI连接**:
- LIS3DH的SCK引脚连接到STM32的SPI时钟线(如PA5)。
- LIS3DH的MISO引脚连接到STM32的SPI数据输入线(如PA6)。
- LIS3DH的MOSI引脚连接到STM32的SPI数据输出线(如PA7)。
- LIS3DH的CS引脚连接到STM32的GPIO引脚(如PA4)。
- LIS3DH的VDD和GND分别连接到STM32的3.3V和GND。
### 软件配置
1. **初始化I2C或SPI接口**:
使用STM32的HAL库或LL库初始化I2C或SPI接口。
2. **读取LIS3DH寄存器**:
通过I2C或SPI接口读取LIS3DH传感器的寄存器数据。
3. **解析数据**:
将读取到的数据解析为加速度值。
### 示例代码(I2C)
```c
#include "stm32f1xx_hal.h"
I2C_HandleTypeDef hi2c1;
#define LIS3DH_ADDR 0x18 << 1
uint8_t read_reg(uint8_t reg) {
uint8_t data;
HAL_I2C_Mem_Read(&hi2c1, LIS3DH_ADDR, reg, 1, &data, 1, HAL_MAX_DELAY);
return data;
}
int main(void) {
HAL_Init();
__HAL_RCC_I2C1_CLK_ENABLE();
__HAL_RCC_GPIOB_CLK_ENABLE();
// Initialize I2C
hi2c1.Instance = I2C1;
hi2c1.Init.ClockSpeed = 100000;
hi2c1.Init.DutyCycle = I2C_DUTYCYCLE_2;
hi2c1.Init.OwnAddress1 = 0;
hi2c1.Init.AddressingMode = I2C_ADDRESSINGMODE_7BIT;
hi2c1.Init.DualAddressMode = I2C_DUALADDRESS_DISABLE;
hi2c1.Init.OwnAddress2 = 0;
hi2c1.Init.GeneralCallMode = I2C_GENERALCALL_DISABLE;
hi2c1.Init.NoStretchMode = I2C_NOSTRETCH_DISABLE;
HAL_I2C_Init(&hi2c1);
// Read WHO_AM_I register
uint8_t who_am_i = read_reg(0x0F);
if (who_am_i == 0x33) {
// LIS3DH is connected
}
while (1) {
// Read accelerometer data
int16_t x = (read_reg(0x29) << 8) | read_reg(0x28);
int16_t y = (read_reg(0x2B) << 8) | read_reg(0x2A);
int16_t z = (read_reg(0x2D) << 8) | read_reg(0x2C);
// Convert to g
float x_g = x / 16384.0;
float y_g = y / 16384.0;
float z_g = z / 16384.0;
HAL_Delay(100);
}
}
```
### 示例代码(SPI)
```c
#include "stm32f1xx_hal.h"
SPI_HandleTypeDef hspi1;
#define LIS3DH_ADDR 0x18
uint8_t read_reg(uint8_t reg) {
uint8_t tx = 0x80 | reg;
uint8_t rx;
HAL_GPIO_WritePin(GPIOA, GPIO_PIN_4, GPIO_PIN_RESET);
HAL_SPI_TransmitReceive(&hspi1, &tx, &rx, 1, HAL_MAX_DELAY);
HAL_GPIO_WritePin(GPIOA, GPIO_PIN_4, GPIO_PIN_SET);
return rx;
}
int main(void) {
HAL_Init();
__HAL_RCC_SPI1_CLK_ENABLE();
__HAL_RCC_GPIOA_CLK_ENABLE();
// Initialize SPI
hspi1.Instance = SPI1;
hspi1.Init.Mode = SPI_MODE_MASTER;
hspi1.Init.Direction = SPI_DIRECTION_2LINES;
hspi1.Init.DataSize = SPI_DATASIZE_8BIT;
hspi1.Init.CLKPolarity = SPI_POLARITY_LOW;
hspi1.Init.CLKPhase = SPI_PHASE_1EDGE;
hspi1.Init.NSS = SPI_NSS_SOFT;
hspi1.Init.BaudRatePrescaler = SPI_BAUDRATEPRESCALER_16;
hspi1.Init.FirstBit = SPI_FIRSTBIT_MSB;
hspi1.Init.TIMode = SPI_TIMODE_DISABLE;
hspi1.Init.CRCCalculation = SPI_CRCCALCULATION_DISABLE;
hspi1.Init.CRCPolynomial = 10;
HAL_SPI_Init(&hspi1);
// Read WHO_AM_I register
uint8_t who_am_i = read_reg(0x0F);
if (who_am_i == 0x33) {
// LIS3DH is connected
}
while (1) {
// Read accelerometer data
int16_t x = (read_reg(0x29) << 8) | read_reg(0x28);
int16_t y = (read_reg(0x2B) << 8) | read_reg(0x2A);
int16_t z = (read_reg(0x2D) << 8) | read_reg(0x2C);
// Convert to g
float x_g = x / 16384.0;
float y_g = y / 16384.0;
float z_g = z / 16384.0;
HAL_Delay(100);
}
}
```
### 结论
通过上述步骤,你可以使用STM32微控制器读取LIS3DH加速度传感器的数据。根据具体的应用需求,你可以进一步处理和利用这些数据。
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