使用stm32F407驱动AD7684进行电压采样
时间: 2024-04-03 16:34:24 浏览: 15
以下是使用STM32F407驱动AD7684进行电压采样的程序,仅供参考:
1. 配置SPI接口
```c
SPI_HandleTypeDef hspi1;
void MX_SPI1_Init(void)
{
/* SPI1 parameter configuration*/
hspi1.Instance = SPI1;
hspi1.Init.Mode = SPI_MODE_MASTER;
hspi1.Init.Direction = SPI_DIRECTION_2LINES;
hspi1.Init.DataSize = SPI_DATASIZE_16BIT;
hspi1.Init.CLKPolarity = SPI_POLARITY_LOW;
hspi1.Init.CLKPhase = SPI_PHASE_1EDGE;
hspi1.Init.NSS = SPI_NSS_SOFT;
hspi1.Init.BaudRatePrescaler = SPI_BAUDRATEPRESCALER_32;
hspi1.Init.FirstBit = SPI_FIRSTBIT_MSB;
hspi1.Init.TIMode = SPI_TIMODE_DISABLE;
hspi1.Init.CRCCalculation = SPI_CRCCALCULATION_DISABLE;
hspi1.Init.CRCPolynomial = 10;
if (HAL_SPI_Init(&hspi1) != HAL_OK)
{
Error_Handler();
}
}
```
2. 定义AD7684相关寄存器地址
```c
#define AD7684_CONVERSION_REG 0x8000
#define AD7684_SETUP_REG 0x2000
#define AD7684_STATUS_REG 0x0000
#define AD7684_CONFIG_REG 0x4000
```
3. 配置AD7684
```c
void AD7684_Init(void)
{
uint16_t txBuf[2];
// 设置采样率为500kSPS
txBuf[0] = AD7684_SETUP_REG | 0x0800;
HAL_SPI_Transmit(&hspi1, txBuf, 1, 100);
HAL_Delay(1);
// 配置转换模式为单端输入
txBuf[0] = AD7684_CONFIG_REG | 0x0000;
HAL_SPI_Transmit(&hspi1, txBuf, 1, 100);
HAL_Delay(1);
}
```
4. 读取AD7684采样数据
```c
uint16_t AD7684_Read(void)
{
uint16_t txBuf[2], rxBuf[2];
// 发送转换命令
txBuf[0] = AD7684_CONVERSION_REG | 0x0000;
HAL_SPI_Transmit(&hspi1, txBuf, 1, 100);
// 读取采样数据
HAL_SPI_Receive(&hspi1, rxBuf, 1, 100);
return rxBuf[0];
}
```
5. 采集电压并转换成实际电压值
```c
#define V_REF 5.0 // 参考电压
float AD7684_GetVoltage(void)
{
uint16_t adcData = AD7684_Read();
float voltage = adcData * V_REF / pow(2, 16);
return voltage;
}
```
6. 主函数中调用AD7684初始化和采样函数
```c
int main(void)
{
/* ...其他初始化代码... */
MX_SPI1_Init();
AD7684_Init();
while (1)
{
float voltage = AD7684_GetVoltage();
// 处理采集到的电压
}
}
```
注意:以上代码仅供参考,实际使用时需要根据具体情况进行修改。