ad7799 stm32代码

好的，下面是一个简单的AD7799和STM32的代码示例，用于读取AD7799的模拟输出数据并将其显示在STM32的LCD上。这个代码示例使用的是STM32F4系列微控制器。请注意，这个代码示例只是一个指导，您需要根据您的具体硬件和需求进行修改。

#include "stm32f4xx.h"
#include "stm32f4xx_gpio.h"
#include "stm32f4xx_rcc.h"
#include "stm32f4xx_spi.h"

#define AD7799_CS_LOW() GPIO_ResetBits(GPIOE, GPIO_Pin_3)
#define AD7799_CS_HIGH() GPIO_SetBits(GPIOE, GPIO_Pin_3)

void AD7799_Init(void)
{
    GPIO_InitTypeDef GPIO_InitStructure;
    SPI_InitTypeDef  SPI_InitStructure;

    RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOE, ENABLE);
    RCC_APB2PeriphClockCmd(RCC_APB2Periph_SPI1, ENABLE);

    GPIO_InitStructure.GPIO_Pin = GPIO_Pin_3; 
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_OUT;
    GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;
    GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
    GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_UP;
    GPIO_Init(GPIOE, &GPIO_InitStructure);

    GPIO_InitStructure.GPIO_Pin = GPIO_Pin_5 | GPIO_Pin_6 | GPIO_Pin_7;
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;
    GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;
    GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
    GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL;
    GPIO_Init(GPIOA, &GPIO_InitStructure);

    GPIO_PinAFConfig(GPIOA, GPIO_PinSource5, GPIO_AF_SPI1);
    GPIO_PinAFConfig(GPIOA, GPIO_PinSource6, GPIO_AF_SPI1);
    GPIO_PinAFConfig(GPIOA, GPIO_PinSource7, GPIO_AF_SPI1);

    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_High;
    SPI_InitStructure.SPI_CPHA = SPI_CPHA_2Edge;
    SPI_InitStructure.SPI_NSS = SPI_NSS_Soft;
    SPI_InitStructure.SPI_BaudRatePrescaler = SPI_BaudRatePrescaler_256;
    SPI_InitStructure.SPI_FirstBit = SPI_FirstBit_MSB;
    SPI_InitStructure.SPI_CRCPolynomial = 7;
    SPI_Init(SPI1, &SPI_InitStructure);

    SPI_Cmd(SPI1, ENABLE);

    AD7799_CS_HIGH();
}

uint32_t AD7799_ReadData(void)
{
    uint32_t data = 0;
    uint8_t readCommand = 0x58;
    uint8_t readData[3];

    AD7799_CS_LOW();

    SPI_I2S_SendData(SPI1, readCommand);
    while (SPI_I2S_GetFlagStatus(SPI1, SPI_I2S_FLAG_BSY) == SET);
    readData[0] = SPI_I2S_ReceiveData(SPI1);

    SPI_I2S_SendData(SPI1, 0x00);
    while (SPI_I2S_GetFlagStatus(SPI1, SPI_I2S_FLAG_BSY) == SET);
    readData[1] = SPI_I2S_ReceiveData(SPI1);

    SPI_I2S_SendData(SPI1, 0x00);
    while (SPI_I2S_GetFlagStatus(SPI1, SPI_I2S_FLAG_BSY) == SET);
    readData[2] = SPI_I2S_ReceiveData(SPI1);

    AD7799_CS_HIGH();

    data = (readData[0] << 16) + (readData[1] << 8) + readData[2];
    return data;
}

int main(void)
{
    uint32_t adData;
    char lcdBuffer[16];

    AD7799_Init();

    while (1)
    {
        adData = AD7799_ReadData();
        sprintf(lcdBuffer, "AD: %lu", adData);
        // 将lcdBuffer的内容显示在LCD上
        // ...
    }
}

以上是一个简单的AD7799和STM32的代码示例，用于读取AD7799的模拟输出数据并将其显示在STM32的LCD上。该代码示例使用的是SPI总线来与AD7799进行通信。您需要进行适当的修改以适应您的具体硬件和需求。