hal库spi传输函数的内部是怎么实现的
时间: 2024-05-27 17:14:06 浏览: 9
HAL库SPI传输函数的内部实现是通过调用相应的底层驱动函数来完成的。具体来说,SPI传输函数会调用HAL库中的SPI发送和接收函数,这些函数会调用底层SPI驱动的发送和接收函数,将数据发送到SPI总线上或从SPI总线上接收数据。在SPI传输期间,底层驱动函数会将数据发送到SPI外设的发送缓冲区中,并从SPI外设的接收缓冲区中接收数据。一旦数据传输完成,HAL库SPI传输函数会返回传输结果。
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hal库spi传输函数的内部代码
由于HAL库的代码是开源的,因此可以在库的源文件中找到SPI传输函数的内部代码。以下是一些常用的SPI传输函数的内部代码示例:
1. HAL_SPI_Transmit()
该函数用于向SPI总线发送数据。其内部代码如下:
```
HAL_StatusTypeDef HAL_SPI_Transmit(SPI_HandleTypeDef *hspi, uint8_t *pData, uint16_t Size, uint32_t Timeout)
{
HAL_StatusTypeDef status = HAL_OK;
uint32_t tickstart = 0;
/* Check the parameters */
assert_param(IS_SPI_DIRECTION_2LINES_OR_1LINE(hspi->Init.Direction));
/* Process Locked */
__HAL_LOCK(hspi);
/* Init tickstart for timeout management*/
tickstart = HAL_GetTick();
/* Transmit data in 8 Bit mode */
if(hspi->Init.DataSize == SPI_DATASIZE_8BIT)
{
while (Size--)
{
/* Wait until TXE flag is set to send data */
if(SPI_WaitFlagStateUntilTimeout(hspi, SPI_FLAG_TXE, RESET, tickstart, Timeout) != HAL_OK)
{
return HAL_TIMEOUT;
}
/* Write data to TX buffer */
hspi->Instance->DR = (*pData++);
/* Wait until RXNE flag is set to receive data */
if(SPI_WaitFlagStateUntilTimeout(hspi, SPI_FLAG_RXNE, RESET, tickstart, Timeout) != HAL_OK)
{
return HAL_TIMEOUT;
}
/* Read received data */
__HAL_SPI_CLEAR_RXNE_FLAG(hspi);
}
}
else
{
/* Transmit data in 16 Bit mode */
while (Size--)
{
/* Wait until TXE flag is set to send data */
if(SPI_WaitFlagStateUntilTimeout(hspi, SPI_FLAG_TXE, RESET, tickstart, Timeout) != HAL_OK)
{
return HAL_TIMEOUT;
}
/* Write data to TX buffer */
hspi->Instance->DR = *((uint16_t*)pData);
pData += sizeof(uint16_t);
/* Wait until RXNE flag is set to receive data */
if(SPI_WaitFlagStateUntilTimeout(hspi, SPI_FLAG_RXNE, RESET, tickstart, Timeout) != HAL_OK)
{
return HAL_TIMEOUT;
}
/* Read received data */
__HAL_SPI_CLEAR_RXNE_FLAG(hspi);
}
}
/* Process Unlocked */
__HAL_UNLOCK(hspi);
return status;
}
```
2. HAL_SPI_Receive()
该函数用于从SPI总线接收数据。其内部代码如下:
```
HAL_StatusTypeDef HAL_SPI_Receive(SPI_HandleTypeDef *hspi, uint8_t *pData, uint16_t Size, uint32_t Timeout)
{
HAL_StatusTypeDef status = HAL_OK;
uint32_t tickstart = 0;
/* Check the parameters */
assert_param(IS_SPI_DIRECTION_2LINES_OR_1LINE(hspi->Init.Direction));
/* Process Locked */
__HAL_LOCK(hspi);
/* Init tickstart for timeout management*/
tickstart = HAL_GetTick();
/* Receive data in 8 Bit mode */
if(hspi->Init.DataSize == SPI_DATASIZE_8BIT)
{
while (Size--)
{
/* Wait until TXE flag is set to send dummy byte */
if(SPI_WaitFlagStateUntilTimeout(hspi, SPI_FLAG_TXE, RESET, tickstart, Timeout) != HAL_OK)
{
return HAL_TIMEOUT;
}
/* Write dummy byte */
hspi->Instance->DR = 0xFF;
/* Wait until RXNE flag is set to receive data */
if(SPI_WaitFlagStateUntilTimeout(hspi, SPI_FLAG_RXNE, RESET, tickstart, Timeout) != HAL_OK)
{
return HAL_TIMEOUT;
}
/* Read received data */
*pData++ = hspi->Instance->DR;
}
}
else
{
/* Receive data in 16 Bit mode */
while (Size--)
{
/* Wait until TXE flag is set to send dummy byte */
if(SPI_WaitFlagStateUntilTimeout(hspi, SPI_FLAG_TXE, RESET, tickstart, Timeout) != HAL_OK)
{
return HAL_TIMEOUT;
}
/* Write dummy byte */
hspi->Instance->DR = 0xFFFF;
/* Wait until RXNE flag is set to receive data */
if(SPI_WaitFlagStateUntilTimeout(hspi, SPI_FLAG_RXNE, RESET, tickstart, Timeout) != HAL_OK)
{
return HAL_TIMEOUT;
}
/* Read received data */
*((uint16_t*)pData) = hspi->Instance->DR;
pData += sizeof(uint16_t);
}
}
/* Process Unlocked */
__HAL_UNLOCK(hspi);
return status;
}
```
3. HAL_SPI_TransmitReceive()
该函数用于在SPI总线上进行双向数据传输。其内部代码如下:
```
HAL_StatusTypeDef HAL_SPI_TransmitReceive(SPI_HandleTypeDef *hspi, uint8_t *pTxData, uint8_t *pRxData, uint16_t Size, uint32_t Timeout)
{
HAL_StatusTypeDef status = HAL_OK;
uint32_t tickstart = 0;
/* Check the parameters */
assert_param(IS_SPI_DIRECTION_2LINES(hspi->Init.Direction));
/* Process Locked */
__HAL_LOCK(hspi);
/* Init tickstart for timeout management*/
tickstart = HAL_GetTick();
/* Transmit and Receive data in 8 Bit mode */
if(hspi->Init.DataSize == SPI_DATASIZE_8BIT)
{
while (Size--)
{
/* Wait until TXE flag is set to send data */
if(SPI_WaitFlagStateUntilTimeout(hspi, SPI_FLAG_TXE, RESET, tickstart, Timeout) != HAL_OK)
{
return HAL_TIMEOUT;
}
/* Write data to TX buffer */
hspi->Instance->DR = (*pTxData++);
/* Wait until RXNE flag is set to receive data */
if(SPI_WaitFlagStateUntilTimeout(hspi, SPI_FLAG_RXNE, RESET, tickstart, Timeout) != HAL_OK)
{
return HAL_TIMEOUT;
}
/* Read received data */
(*pRxData++) = hspi->Instance->DR;
}
}
else
{
/* Transmit and Receive data in 16 Bit mode */
while (Size--)
{
/* Wait until TXE flag is set to send data */
if(SPI_WaitFlagStateUntilTimeout(hspi, SPI_FLAG_TXE, RESET, tickstart, Timeout) != HAL_OK)
{
return HAL_TIMEOUT;
}
/* Write data to TX buffer */
hspi->Instance->DR = *((uint16_t*)pTxData);
pTxData += sizeof(uint16_t);
/* Wait until RXNE flag is set to receive data */
if(SPI_WaitFlagStateUntilTimeout(hspi, SPI_FLAG_RXNE, RESET, tickstart, Timeout) != HAL_OK)
{
return HAL_TIMEOUT;
}
/* Read received data */
*((uint16_t*)pRxData) = hspi->Instance->DR;
pRxData += sizeof(uint16_t);
}
}
/* Process Unlocked */
__HAL_UNLOCK(hspi);
return status;
}
```
stm32使用hal库SPI传输数据
STM32是一款广泛使用的微控制器系列,而HAL库是ST公司提供的一套硬件抽象层库,用于简化STM32的开发。下面是使用HAL库进行SPI数据传输的步骤:
1. 初始化SPI总线:首先需要初始化SPI总线,包括设置SPI的工作模式、数据位数、时钟极性和相位等参数。
2. 配置SPI设备:接下来需要配置具体的SPI设备,包括设置设备的片选引脚、数据传输速度等。
3. 发送数据:使用HAL库提供的函数,将要发送的数据写入发送缓冲区。
4. 接收数据:如果需要接收数据,可以使用HAL库提供的函数,从接收缓冲区读取数据。
5. 处理中断:如果使用中断方式进行数据传输,需要编写相应的中断处理函数,并在初始化时配置中断。
6. 处理错误:在数据传输过程中,可能会出现错误,需要根据错误类型进行相应的处理。
7. 关闭SPI总线:在数据传输完成后,可以关闭SPI总线以释放资源。
以上是使用HAL库进行SPI数据传输的基本步骤。具体的代码实现可以参考ST官方提供的HAL库文档和示例代码。
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