?? setusart.c
字號:
/*******************************************************************************
* Function Name : USART_Configuration
* Description : Configures the USART1.
* Input : None
* Output : None
* Return : None
*******************************************************************************/
#include <stm32f10x_lib.h> /* STM32F10x Library Definitions */
int GetKey (void) ;
int SendChar (int ch) ;
void SetupUSART (void) {
USART_InitTypeDef USART_InitStructure;
/* USART1 configuration ------------------------------------------------------*/
/* USART1 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 Clock disabled
- USART CPOL: Clock is active low
- USART CPHA: Data is captured on the middle
- USART LastBit: The clock pulse of the last data bit is not output to
the SCLK pin
*/
USART_InitStructure.USART_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_InitStructure.USART_Clock = USART_Clock_Disable;
USART_InitStructure.USART_CPOL = USART_CPOL_Low;
USART_InitStructure.USART_CPHA = USART_CPHA_2Edge;
USART_InitStructure.USART_LastBit = USART_LastBit_Disable;
USART_Init(USART1, &USART_InitStructure);
/* Enable USART1 */
USART_Cmd(USART1, ENABLE);
}
/* Implementation of putchar (also used by printf function to output data) */
int SendChar (int ch) { /* Write character to Serial Port */
USART_SendData(USART1, (unsigned char) ch);
while (!(USART1->SR & USART_FLAG_TXE));
return (ch);
}
int GetKey (void) { /* Read character from Serial Port */
while (!(USART1->SR & USART_FLAG_RXNE));
return (USART_ReceiveData(USART1));
}
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