STM32 驱动ADS1220
时间: 2023-10-31 20:01:17 浏览: 226
基于STM32L05XX_ADS1220驱动
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ADS1220是一款16位精度的差分式模拟-数字转换器(ADC),适用于高精度测量应用。下面介绍如何使用STM32驱动ADS1220。
首先,需要连接ADS1220和STM32。ADS1220与STM32之间的接口可以是SPI或I2C。在本例中,我们使用SPI接口。
接下来,需要编写STM32的SPI驱动程序,从ADS1220读取数据。以下是示例代码:
```c
#include "stm32f10x.h"
// 定义SPI引脚
#define ADS1220_SPI SPI1
#define ADS1220_GPIO GPIOA
#define ADS1220_CS_PIN GPIO_Pin_4
#define ADS1220_SCK_PIN GPIO_Pin_5
#define ADS1220_MISO_PIN GPIO_Pin_6
#define ADS1220_MOSI_PIN GPIO_Pin_7
// 初始化SPI
void ADS1220_SPI_Init(void)
{
SPI_InitTypeDef SPI_InitStructure;
GPIO_InitTypeDef GPIO_InitStructure;
// 使能SPI时钟和GPIO时钟
RCC_APB2PeriphClockCmd(RCC_APB2Periph_SPI1 | RCC_APB2Periph_GPIOA, ENABLE);
// 配置SPI引脚
GPIO_InitStructure.GPIO_Pin = ADS1220_CS_PIN | ADS1220_SCK_PIN | ADS1220_MOSI_PIN;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
GPIO_Init(ADS1220_GPIO, &GPIO_InitStructure);
GPIO_InitStructure.GPIO_Pin = ADS1220_MISO_PIN;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;
GPIO_Init(ADS1220_GPIO, &GPIO_InitStructure);
// 配置SPI
SPI_StructInit(&SPI_InitStructure);
SPI_InitStructure.SPI_Direction = SPI_Direction_2Lines_FullDuplex;
SPI_InitStructure.SPI_Mode = SPI_Mode_Master;
SPI_InitStructure.SPI_DataSize = SPI_DataSize_8b;
SPI_InitStructure.SPI_CPOL = SPI_CPOL_Low;
SPI_InitStructure.SPI_CPHA = SPI_CPHA_1Edge;
SPI_InitStructure.SPI_NSS = SPI_NSS_Soft;
SPI_InitStructure.SPI_BaudRatePrescaler = SPI_BaudRatePrescaler_4;
SPI_Init(ADS1220_SPI, &SPI_InitStructure);
// 使能SPI
SPI_Cmd(ADS1220_SPI, ENABLE);
}
// 读取ADS1220数据
uint16_t ADS1220_ReadData(void)
{
uint16_t data;
// 使能ADS1220
GPIO_ResetBits(ADS1220_GPIO, ADS1220_CS_PIN);
// 发送读取命令
SPI_SendData(ADS1220_SPI, 0x01);
// 等待数据读取完成
while (SPI_I2S_GetFlagStatus(ADS1220_SPI, SPI_I2S_FLAG_RXNE) == RESET);
// 读取高8位数据
data = SPI_ReceiveData(ADS1220_SPI) << 8;
// 发送读取命令
SPI_SendData(ADS1220_SPI, 0x01);
// 等待数据读取完成
while (SPI_I2S_GetFlagStatus(ADS1220_SPI, SPI_I2S_FLAG_RXNE) == RESET);
// 读取低8位数据
data |= SPI_ReceiveData(ADS1220_SPI);
// 禁用ADS1220
GPIO_SetBits(ADS1220_GPIO, ADS1220_CS_PIN);
return data;
}
int main(void)
{
uint16_t data;
// 初始化SPI
ADS1220_SPI_Init();
while (1)
{
// 读取ADS1220数据
data = ADS1220_ReadData();
// 处理数据
// ...
// 延时
// ...
}
}
```
在上面的代码中,初始化函数`ADS1220_SPI_Init()`配置了SPI接口和GPIO引脚。`ADS1220_ReadData()`函数实现了从ADS1220读取数据的过程。
通过上述步骤,就可以在STM32上驱动ADS1220实现高精度测量了。
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