在STM32单片机读取ADS1258寄存器的程序中,为什么DRDY引脚要配置成外部中断呢
时间: 2024-04-13 16:25:17 浏览: 33
在STM32单片机读取ADS1258寄存器的程序中,将DRDY引脚配置成外部中断的目的是为了实现数据的同步读取。ADS1258是一款高精度的24位模数转换器(ADC),它的数据输出通过DRDY引脚来通知单片机数据已经准备好。当DRDY引脚检测到信号变化时,触发外部中断,单片机即可立即响应并读取ADS1258寄存器中的数据。
配置DRDY引脚为外部中断可以避免单片机不停地查询ADS1258的状态,节省了CPU资源和功耗。同时,外部中断的响应速度很快,可以及时捕捉到数据准备好的事件,确保读取到最新的数据。
在程序中,需要将DRDY引脚配置为外部中断模式,设置相应的中断触发条件(上升沿、下降沿或双边沿触发),并编写中断服务函数来处理数据读取操作。当DRDY引脚触发中断时,中断服务函数会被调用,从而实现对ADS1258寄存器数据的读取和处理。
相关问题
使用stm32f407vet6的SPI1接口接ADS131A04芯片,使用PA3作为DRDY引脚,写出ADS131A04的驱动程序
好的,以下是基于HAL库的ADS131A04驱动程序示例:
```c
#include "stm32f4xx_hal.h"
#define ADS131A04_SPI_TIMEOUT 1000
/* ADS131A04命令字 */
#define CMD_WAKEUP 0x02
#define CMD_STANDBY 0x04
#define CMD_RESET 0x06
#define CMD_START 0x08
#define CMD_STOP 0x0A
#define CMD_RDATA 0x12
#define CMD_RDATAC 0x14
#define CMD_SDATAC 0x16
#define CMD_RREG 0x20
#define CMD_WREG 0x40
/* ADS131A04寄存器地址 */
#define REG_ID 0x00
#define REG_CONFIG1 0x01
#define REG_CONFIG2 0x02
#define REG_CONFIG3 0x03
#define REG_CH1SET 0x04
#define REG_CH2SET 0x05
#define REG_CH3SET 0x06
#define REG_CH4SET 0x07
#define REG_CH5SET 0x08
#define REG_CH6SET 0x09
#define REG_CH7SET 0x0A
#define REG_CH8SET 0x0B
#define REG_RLD_SENSP 0x0C
#define REG_RLD_SENSN 0x0D
#define REG_LOFF 0x0E
#define REG_RESP1 0x10
#define REG_RESP2 0x11
/* ADS131A04寄存器值 */
#define CONFIG1_VAL 0x30 // 采样率2KSPS,无功率线干扰滤波器
#define CONFIG2_VAL 0x00 // 正常功率线频率
#define CONFIG3_VAL 0x00 // 内部参考电压
#define CHNSET_VAL 0x00 // 缺省通道设置,单端,增益1
/* ADS131A04引脚定义 */
#define DRDY_PIN GPIO_PIN_3
#define DRDY_PORT GPIOA
/* ADS131A04寄存器读写函数 */
static uint8_t ADS131A04_ReadReg(SPI_HandleTypeDef *hspi, uint8_t reg)
{
uint8_t txbuf[2] = {CMD_RREG | reg, 0x00};
uint8_t rxbuf[2] = {0x00, 0x00};
HAL_GPIO_WritePin(DRDY_PORT, DRDY_PIN, GPIO_PIN_SET); // 关闭DRDY中断
HAL_SPI_TransmitReceive(hspi, txbuf, rxbuf, 2, ADS131A04_SPI_TIMEOUT);
HAL_GPIO_WritePin(DRDY_PORT, DRDY_PIN, GPIO_PIN_RESET); // 重新打开DRDY中断
return rxbuf[1];
}
static void ADS131A04_WriteReg(SPI_HandleTypeDef *hspi, uint8_t reg, uint8_t val)
{
uint8_t txbuf[2] = {CMD_WREG | reg, val};
HAL_GPIO_WritePin(DRDY_PORT, DRDY_PIN, GPIO_PIN_SET); // 关闭DRDY中断
HAL_SPI_Transmit(hspi, txbuf, 2, ADS131A04_SPI_TIMEOUT);
HAL_GPIO_WritePin(DRDY_PORT, DRDY_PIN, GPIO_PIN_RESET); // 重新打开DRDY中断
}
/* ADS131A04控制函数 */
void ADS131A04_Init(SPI_HandleTypeDef *hspi)
{
// 等待ADS131A04上电稳定
HAL_Delay(10);
// 复位ADS131A04
ADS131A04_WriteReg(hspi, REG_CONFIG1, CMD_RESET);
HAL_Delay(100); // 复位后需要一定时间恢复
// 设置ADS131A04采样率和滤波器
ADS131A04_WriteReg(hspi, REG_CONFIG1, CONFIG1_VAL);
ADS131A04_WriteReg(hspi, REG_CONFIG2, CONFIG2_VAL);
ADS131A04_WriteReg(hspi, REG_CONFIG3, CONFIG3_VAL);
// 配置通道设置
ADS131A04_WriteReg(hspi, REG_CH1SET, CHNSET_VAL);
ADS131A04_WriteReg(hspi, REG_CH2SET, CHNSET_VAL);
ADS131A04_WriteReg(hspi, REG_CH3SET, CHNSET_VAL);
ADS131A04_WriteReg(hspi, REG_CH4SET, CHNSET_VAL);
// 退出SDATAC模式
ADS131A04_WriteReg(hspi, REG_CONFIG1, CMD_RDATAC);
}
void ADS131A04_Start(SPI_HandleTypeDef *hspi)
{
ADS131A04_WriteReg(hspi, REG_CONFIG1, CMD_START);
}
void ADS131A04_Stop(SPI_HandleTypeDef *hspi)
{
ADS131A04_WriteReg(hspi, REG_CONFIG1, CMD_STOP);
}
void ADS131A04_ReadData(SPI_HandleTypeDef *hspi, uint8_t *rxbuf, uint32_t len)
{
uint8_t txbuf[1] = {CMD_RDATA};
// 关闭DRDY中断
HAL_GPIO_WritePin(DRDY_PORT, DRDY_PIN, GPIO_PIN_SET);
// 发送读取数据命令
HAL_SPI_Transmit(hspi, txbuf, 1, ADS131A04_SPI_TIMEOUT);
// 读取数据
HAL_SPI_Receive(hspi, rxbuf, len, ADS131A04_SPI_TIMEOUT);
// 重新打开DRDY中断
HAL_GPIO_WritePin(DRDY_PORT, DRDY_PIN, GPIO_PIN_RESET);
}
uint8_t ADS131A04_ReadStatus(SPI_HandleTypeDef *hspi)
{
return ADS131A04_ReadReg(hspi, REG_CONFIG1);
}
```
需要注意的是,该代码中使用PA3作为DRDY引脚,需要在初始化时将其配置为输入模式,并开启外部中断。在中断服务函数中,应当更新数据缓冲区并处理数据。
使用stm32f407vet6的spi1接口连接ADS131A04,PA3为drdy引脚,ADS131A04基于标准库函数的驱动软件怎么写?
首先,需要在stm32f407vet6上配置SPI1接口。以下是基于标准库函数的SPI1配置代码:
```c
// Enable GPIOA clock
RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOA, ENABLE);
// Enable SPI1 clock
RCC_APB2PeriphClockCmd(RCC_APB2Periph_SPI1, ENABLE);
// Configure SPI1 pins
GPIO_InitTypeDef GPIO_InitStruct;
GPIO_InitStruct.GPIO_Pin = GPIO_Pin_5 | GPIO_Pin_6 | GPIO_Pin_7;
GPIO_InitStruct.GPIO_Mode = GPIO_Mode_AF;
GPIO_InitStruct.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_InitStruct.GPIO_OType = GPIO_OType_PP;
GPIO_InitStruct.GPIO_PuPd = GPIO_PuPd_UP;
GPIO_Init(GPIOA, &GPIO_InitStruct);
// Connect SPI1 pins to AF5
GPIO_PinAFConfig(GPIOA, GPIO_PinSource5, GPIO_AF_SPI1);
GPIO_PinAFConfig(GPIOA, GPIO_PinSource6, GPIO_AF_SPI1);
GPIO_PinAFConfig(GPIOA, GPIO_PinSource7, GPIO_AF_SPI1);
// Configure SPI1
SPI_InitTypeDef SPI_InitStruct;
SPI_InitStruct.SPI_Direction = SPI_Direction_2Lines_FullDuplex;
SPI_InitStruct.SPI_Mode = SPI_Mode_Master;
SPI_InitStruct.SPI_DataSize = SPI_DataSize_8b;
SPI_InitStruct.SPI_CPOL = SPI_CPOL_Low;
SPI_InitStruct.SPI_CPHA = SPI_CPHA_1Edge;
SPI_InitStruct.SPI_NSS = SPI_NSS_Soft;
SPI_InitStruct.SPI_BaudRatePrescaler = SPI_BaudRatePrescaler_256;
SPI_InitStruct.SPI_FirstBit = SPI_FirstBit_MSB;
SPI_InitStruct.SPI_CRCPolynomial = 7;
SPI_Init(SPI1, &SPI_InitStruct);
// Enable SPI1
SPI_Cmd(SPI1, ENABLE);
```
接下来需要编写ADS131A04的驱动程序。以下是基于标准库函数的ADS131A04驱动程序:
```c
#include "stm32f4xx.h"
#define ADS131A04_CS_LOW() GPIO_ResetBits(GPIOA, GPIO_Pin_4)
#define ADS131A04_CS_HIGH() GPIO_SetBits(GPIOA, GPIO_Pin_4)
void ADS131A04_Init(void)
{
// Enable GPIOA clock
RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOA, ENABLE);
// Configure ADS131A04 DRDY pin
GPIO_InitTypeDef GPIO_InitStruct;
GPIO_InitStruct.GPIO_Pin = GPIO_Pin_3;
GPIO_InitStruct.GPIO_Mode = GPIO_Mode_IN;
GPIO_InitStruct.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_InitStruct.GPIO_OType = GPIO_OType_PP;
GPIO_InitStruct.GPIO_PuPd = GPIO_PuPd_UP;
GPIO_Init(GPIOA, &GPIO_InitStruct);
// Configure ADS131A04 CS pin
GPIO_InitStruct.GPIO_Pin = GPIO_Pin_4;
GPIO_InitStruct.GPIO_Mode = GPIO_Mode_OUT;
GPIO_InitStruct.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_InitStruct.GPIO_OType = GPIO_OType_PP;
GPIO_InitStruct.GPIO_PuPd = GPIO_PuPd_UP;
GPIO_Init(GPIOA, &GPIO_InitStruct);
ADS131A04_CS_HIGH();
}
void ADS131A04_ReadData(uint8_t* data)
{
// Wait for DRDY pin to go low
while(GPIO_ReadInputDataBit(GPIOA, GPIO_Pin_3) == Bit_SET);
// Set CS pin low to select ADS131A04
ADS131A04_CS_LOW();
// Send read command
SPI_I2S_SendData(SPI1, 0x01);
while(SPI_I2S_GetFlagStatus(SPI1, SPI_I2S_FLAG_BSY) == SET);
// Read data
for(int i = 0; i < 8; i++)
{
SPI_I2S_SendData(SPI1, 0x00);
while(SPI_I2S_GetFlagStatus(SPI1, SPI_I2S_FLAG_BSY) == SET);
data[i] = SPI_I2S_ReceiveData(SPI1);
}
// Set CS pin high to deselect ADS131A04
ADS131A04_CS_HIGH();
}
```
在上面的驱动程序中,我们首先初始化了ADS131A04的DRDY和CS引脚。然后,当DRDY引脚变为低电平时,我们将CS引脚设置为低电平,向ADS131A04发送读取命令,并读取8个字节的数据。最后,我们将CS引脚设置为高电平,取消选中ADS131A04。