STM32F4xx_USART_Example

使用二级缓存方法，来实现STM32F4的USART驱动。适用于STM32F4全部芯片。

开发环境

• 固件库：STM32F4xx_DSP_StdPeriph_Lib_V1.8.0
• 编译器：ARMCC V5.06
• IDE：Keil uVision5
• 操作系统：Windows 10 专业版

API

• void USART_Configure(USART_TypeDef *USARTx, USART_BaudRate BaudRate, USART_DataBits DataBits, USART_StopBits StopBits, USART_Parity Parity)
• void USART_Unconfigure(USART_TypeDef *USARTx)
• uint32_t USART_SetSendData(USART_TypeDef *USARTx, const void *Data, uint32_t Length)
• uint32_t USART_GetReceiveData(USART_TypeDef *USARTx, void *Data, uint32_t Length)
• void USART_SetSendDataFinishCallback(USART_TypeDef *USARTx, void (*Function)(void))
• void USART_SetReceiveDataFinishCallback(USART_TypeDef *USARTx, void (*Function)(void))
• void USART_ClearSendDataFinishCallback(USART_TypeDef *USARTx)
• void USART_ClearReceiveDataFinishCallback(USART_TypeDef *USARTx)
• uint64_t USART_GetSendDataCount(USART_TypeDef *USARTx)
• uint64_t USART_GetReceiveDataCount(USART_TypeDef *USARTx)
• void USART_ClearSendDataCount(USART_TypeDef *USARTx)
• void USART_ClearReceiveDataCount(USART_TypeDef *USARTx)
• uint32_t USART_GetUsedSendBufferSize(USART_TypeDef *USARTx)
• uint32_t USART_GetUsedReceiveBufferSize(USART_TypeDef *USARTx)
• uint32_t USART_GetUnusedSendBufferSize(USART_TypeDef *USARTx)
• uint32_t USART_GetUnusedReceiveBufferSize(USART_TypeDef *USARTx)
• float USART_GetSendBufferUnilizationRatio(USART_TypeDef *USARTx)
• float USART_GetReceiveBufferUnilizationRatio(USART_TypeDef *USARTx)
• void USART_ClearSendBuffer(USART_TypeDef *USARTx)
• void USART_ClearReceiveBuffer(USART_TypeDef *USARTx)
• bool USART_IsSendBufferEmpty(USART_TypeDef *USARTx)
• bool USART_IsReceiveBufferEmpty(USART_TypeDef *USARTx)
• bool USART_IsSendBufferFull(USART_TypeDef *USARTx)
• bool USART_IsReceiveBufferFull(USART_TypeDef *USARTx)
• bool USART_IsSendingData(USART_TypeDef *USARTx)

注意

配置比特率时需要注意，比特率必须小于等于，总线时钟频率除以16。如果想要修改缓存大小和硬件接口，请到头文件中修改。DMA缓存大小为0~65535，USART缓存不能小于DMA缓存。用不到的端口，可以将缓存改为0。