STM32-24位AD7799驱动之手册代码详解,支持模拟SPI和硬件SPI
时间: 2023-07-12 22:28:26 浏览: 257
AD7705_drivers_SPI配置_ad7705程序_ad7705stm32_AD7705_
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很高兴为您解答这个问题。以下是针对STM32-24位AD7799驱动手册代码详解的简要说明。
首先,AD7799是一款24位精度的模数转换器,可用于测量各种传感器的输出信号。它可通过SPI接口与微控制器(如STM32)通信,以读取和写入寄存器值。
在STM32中,可以采用模拟SPI或硬件SPI与AD7799通信,具体实现方式取决于使用的STM32型号和开发环境。以下是一些可能使用的代码和说明:
1. 模拟SPI方式:
```c
// 初始化GPIO口
GPIO_InitTypeDef GPIO_InitStructure;
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_8 | GPIO_Pin_9 | GPIO_Pin_10 | GPIO_Pin_11;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_Init(GPIOB, &GPIO_InitStructure);
// 初始化SPI
void SPI_GPIO_Config(void)
{
GPIO_InitTypeDef GPIO_InitStructure;
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOB,ENABLE);
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_13|GPIO_Pin_14|GPIO_Pin_15;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;
GPIO_Init(GPIOB,&GPIO_InitStructure);
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_12;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IPU;
GPIO_Init(GPIOB,&GPIO_InitStructure);
}
void AD7799_SPI_Init(void)
{
RCC_APB2PeriphClockCmd(RCC_APB2Periph_SPI1, ENABLE);
SPI_InitTypeDef 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_High;
SPI_InitStructure.SPI_CPHA = SPI_CPHA_2Edge;
SPI_InitStructure.SPI_NSS = SPI_NSS_Soft;
SPI_InitStructure.SPI_BaudRatePrescaler = SPI_BaudRatePrescaler_2;
SPI_InitStructure.SPI_FirstBit = SPI_FirstBit_MSB;
SPI_Init(SPI1, &SPI_InitStructure);
SPI_Cmd(SPI1, ENABLE);
}
// SPI发送数据
uint8_t AD7799_SPI_Write(uint8_t data)
{
uint8_t i;
for(i = 0; i < 8; i++)
{
if(data & 0x80)
GPIO_SetBits(GPIOB, GPIO_Pin_9);
else
GPIO_ResetBits(GPIOB, GPIO_Pin_9);
data <<= 1;
GPIO_ResetBits(GPIOB, GPIO_Pin_10);
GPIO_SetBits(GPIOB, GPIO_Pin_10);
}
return data;
}
// SPI接收数据
uint8_t AD7799_SPI_Read(void)
{
uint8_t i, data = 0;
for(i = 0; i < 8; i++)
{
data <<= 1;
GPIO_ResetBits(GPIOB, GPIO_Pin_10);
if(GPIO_ReadInputDataBit(GPIOB, GPIO_Pin_11))
data |= 0x01;
GPIO_SetBits(GPIOB, GPIO_Pin_10);
}
return data;
}
```
2. 硬件SPI方式:
```c
// 初始化SPI
void AD7799_SPI_Init(void)
{
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA | RCC_APB2Periph_SPI1, ENABLE);
GPIO_InitTypeDef GPIO_InitStructure;
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_5 | GPIO_Pin_6 | GPIO_Pin_7;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_Init(GPIOA, &GPIO_InitStructure);
SPI_InitTypeDef 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_High;
SPI_InitStructure.SPI_CPHA = SPI_CPHA_2Edge;
SPI_InitStructure.SPI_NSS = SPI_NSS_Soft;
SPI_InitStructure.SPI_BaudRatePrescaler = SPI_BaudRatePrescaler_2;
SPI_InitStructure.SPI_FirstBit = SPI_FirstBit_MSB;
SPI_Init(SPI1, &SPI_InitStructure);
SPI_Cmd(SPI1, ENABLE);
}
// SPI发送数据
uint8_t AD7799_SPI_Write(uint8_t data)
{
while(SPI_I2S_GetFlagStatus(SPI1, SPI_I2S_FLAG_TXE) == RESET);
SPI_I2S_SendData(SPI1, data);
while(SPI_I2S_GetFlagStatus(SPI1, SPI_I2S_FLAG_RXNE) == RESET);
return SPI_I2S_ReceiveData(SPI1);
}
```
上述代码只是示例,具体实现方式需要根据您的应用场景进行调整。同时,还需要编写读取和写入AD7799寄存器的函数,例如:
```c
// AD7799写寄存器函数
void AD7799_WriteReg(uint8_t reg, uint16_t value)
{
AD7799_SPI_Write(reg << 3);
AD7799_SPI_Write(value >> 8);
AD7799_SPI_Write(value & 0xFF);
}
// AD7799读寄存器函数
uint16_t AD7799_ReadReg(uint8_t reg)
{
uint16_t value = 0;
AD7799_SPI_Write((reg << 3) | 0x04);
value |= AD7799_SPI_Read() << 8;
value |= AD7799_SPI_Read();
return value;
}
```
以上是一个简单的STM32-24位AD7799驱动手册代码详解。希望能帮助到您!
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