初始化代码如下：
UARTn_Init(COM1,115200);
UARTn_Init(COM2,115200);
UARTn_Init(COM3,115200);
UARTn_Init(COM6,115200);
void UARTn_Init(COMn_TypeDef COM,uint32_t BaudRate)
{
GPIO_InitTypeDef GPIO_InitStructure;
USART_InitTypeDef USART_InitStructure;
/* Enable GPIO clock */
RCC_AHB1PeriphClockCmd(COM_TX_PORT_CLK[COM] | COM_RX_PORT_CLK[COM], ENABLE);
if (COM == COM1 ||COM == COM6)
{
/* Enable UART clock */
RCC_APB2PeriphClockCmd(COM_USART_CLK[COM], ENABLE);
}
else
{
/* Enable UART clock */
RCC_APB1PeriphClockCmd(COM_USART_CLK[COM], ENABLE);
}
/* USARTx configured as follow:
- BaudRate = 115200 baud
- Word Length = 8 Bits
- One Stop Bit
- No parity
- Hardware flow control disabled (RTS and CTS signals)
- Receive and transmit enabled
*/
USART_InitStructure.USART_BaudRate = BaudRate;//115200;
USART_InitStructure.USART_WordLength = USART_WordLength_8b;
USART_InitStructure.USART_StopBits = USART_StopBits_1;
USART_InitStructure.USART_Parity = USART_Parity_No;
USART_InitStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_None;
USART_InitStructure.USART_Mode = USART_Mode_Rx | USART_Mode_Tx;
/* USART configuration */
USART_Init(COM_USART[COM], &USART_InitStructure);
/* Connect PXx to USARTx_Tx*/
GPIO_PinAFConfig(COM_TX_PORT[COM], COM_TX_PIN_SOURCE[COM], COM_TX_AF[COM]);
/* Connect PXx to USARTx_Rx*/
GPIO_PinAFConfig(COM_RX_PORT[COM], COM_RX_PIN_SOURCE[COM], COM_RX_AF[COM]);
/* Configure USART Tx as alternate function */
GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;
GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_UP;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;
GPIO_InitStructure.GPIO_Pin = COM_TX_PIN[COM];
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_Init(COM_TX_PORT[COM], &GPIO_InitStructure);
/* Configure USART Rx as alternate function */
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;
GPIO_InitStructure.GPIO_Pin = COM_RX_PIN[COM];
GPIO_Init(COM_RX_PORT[COM], &GPIO_InitStructure);
Buf_Fifo_Init(COM);
/* Enable USART */
USART_Cmd(COM_USART[COM], ENABLE);
USART_ClearFlag(COM_USART[COM],USART_FLAG_TC);
USARTn_Int_Init(COM);
}
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