stm32学习第四天
DMA1：各个通道一览
DMA2：各个通道一览
1.stm32DMA相关固件库函数说明
第一个参数选择哪一个DMA的哪一个通道
初始化函数
void DMA_Init(DMA_Channel_TypeDef* DMAy_Channelx, DMA_InitTypeDef* DMA_InitStruct);typedef struct
{
uint32_t DMA_PeripheralBaseAddr; //外设地址
uint32_t DMA_MemoryBaseAddr; //存储器地址
uint32_t DMA_DIR; //传输方向
//#define DMA_DIR_PeripheralDST //外设作为目标
//#define DMA_DIR_PeripheralSRC //外设作为源
uint32_t DMA_BufferSize; //输出大小
uint32_t DMA_PeripheralInc; //外设地址增量模式
//#define DMA_PeripheralInc_Enable
//#define DMA_PeripheralInc_Disable
uint32_t DMA_MemoryInc; //存储器地址增量模式
//#define DMA_MemoryInc_Enable
//#define DMA_MemoryInc_Disable
uint32_t DMA_PeripheralDataSize; //外设数据宽度 字节，半字
//#define DMA_PeripheralDataSize_Byte 字节
//#define DMA_PeripheralDataSize_HalfWord 半字
//#define DMA_PeripheralDataSize_Word 字
uint32_t DMA_MemoryDataSize; //存储器数据宽度
//#define DMA_MemoryDataSize_Byte
//#define DMA_MemoryDataSize_HalfWord
//#define DMA_MemoryDataSize_Word
uint32_t DMA_Mode; //模式选择
//#define DMA_Mode_Circular 循环模式
//#define DMA_Mode_Normal 正常模式
uint32_t DMA_Priority; //通道优先级
//#define DMA_Priority_VeryHigh
//#define DMA_Priority_High
//#define DMA_Priority_Medium
//#define DMA_Priority_Low
uint32_t DMA_M2M; //存储器到存储器模式
//#define DMA_M2M_Enable
//#define DMA_M2M_Disable
}DMA_InitTypeDef;
开启DMA通道
void DMA_Cmd(DMA_Channel_TypeDef* DMAy_Channelx, FunctionalState NewState)ENABLE or DISABLE.
DMA中断配置
void DMA_ITConfig(DMA_Channel_TypeDef* DMAy_Channelx, uint32_t DMA_IT, FunctionalState NewState);第二个参数设置，中断请求，第三个参数设置，打开还是关闭，ENABLE or DISABLE.
DMA_IT_TC: Transfer complete interrupt mask
DMA_IT_HT: Half transfer interrupt mask
DMA_IT_TE: Transfer error interrupt mask
DMA清除中断挂起
void DMA_ClearITPendingBit(uint32_t DMAy_IT);DMA获取中断状态
ITStatus DMA_GetITStatus(uint32_t DMAy_IT);获取传输剩余个数
uint16_t DMA_GetCurrDataCounter(DMA_Channel_TypeDef* DMAy_Channelx);DMA时钟在AHB总线上
void RCC_AHBPeriphResetCmd(uint32_t RCC_AHBPeriph, FunctionalState NewState);2.串口
异步通信，全双工；
串口固件库函数：
1)初始化串口
参数1：USART1, USART2, USART3（同步，异步）, UART4 or UART5（异步）
参数2：结构体
void USART_Init(USART_TypeDef* USARTx, USART_InitTypeDef* USART_InitStruct);typedef struct
{
uint32_t USART_BaudRate; //波特率
uint16_t USART_WordLength; //有效数据位
//#define USART_WordLength_8b
//#define USART_WordLength_9b
uint16_t USART_StopBits; //停止位，串口一般为1
//#define USART_StopBits_1
//#define USART_StopBits_0_5
//#define USART_StopBits_2
//#define USART_StopBits_1_5
uint16_t USART_Parity; //校验
//#define USART_Parity_No //没有校验
//#define USART_Parity_Even //偶校验
//#define USART_Parity_Odd //奇校验
uint16_t USART_Mode; //串口模式
//#define USART_Mode_Rx //发送模式
//#define USART_Mode_Tx //接收模式
uint16_t USART_HardwareFlowControl; //流控
//#define USART_HardwareFlowControl_None // 无流控
//#define USART_HardwareFlowControl_RTS
//#define USART_HardwareFlowControl_CTS
//#define USART_HardwareFlowControl_RTS_CTS
} USART_InitTypeDef;
2）打开串口使能：
USART1, USART2, USART3, UART4 or UART5.
第二个参数为：ENABLE or DISABLE.
void USART_Cmd(USART_TypeDef* USARTx, FunctionalState NewState)3）串口中断：
USART1, USART2, USART3, UART4 or UART5.
第二个参数为：
@arg USART_IT_CTS: CTS change interrupt (not available for UART4 and UART5)
* @arg USART_IT_LBD: LIN Break detection interrupt
* @arg USART_IT_TXE: Transmit Data Register empty interrupt 发送中断（发送完成）
* @arg USART_IT_TC: Transmission complete interrupt
* @arg USART_IT_RXNE: Receive Data register not empty interrupt 接收中断（收到数据）
* @arg USART_IT_IDLE: Idle line detection interrupt 空闲中断
* @arg USART_IT_PE: Parity Error interrupt
* @arg USART_IT_ERR: Error interrupt(Frame error, noise error, overrun error)
第三个参数为：ENABLE or DISABLE.
void USART_ITConfig(USART_TypeDef* USARTx, uint16_t USART_IT, FunctionalState NewState);4）发送函数
USART1, USART2, USART3, UART4 or UART5.
第二个参数为要发送的数据：
void USART_SendData(USART_TypeDef* USARTx, uint16_t Data);4）接收函数
uint16_t USART_ReceiveData(USART_TypeDef* USARTx);接收的数据以返回值的形式接收
5）DMA串口打开
第一个参数： USART1, USART2, USART3, UART4 or UART5.
第二个参数：
@arg USART_DMAReq_Tx: USART DMA transmit request 发送请求
@arg USART_DMAReq_Rx: USART DMA receive request 接收
第三个：
ENABLE or DISABLE.
void USART_DMACmd(USART_TypeDef* USARTx, uint16_t USART_DMAReq, FunctionalState NewState);