STM32L152RC 在keil4中使用printf()和scanf() 函数
1、在keil中配置使用Micro LIB,如下圖
2、配置USART模塊
?void SYS_USARTInit(void)
{
? ? static USART_InitTypeDef USART_InitStructure;
? ? static GPIO_InitTypeDef GPIO_InitStructure;
?
? ? 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;
?
?
? ? /* Enable GPIO clock */
? ? RCC_AHBPeriphClockCmd(RCC_AHBPeriph_GPIOA, ENABLE);?
? ? /* Enable UART clock */
? ? RCC_APB2PeriphClockCmd(RCC_APB2Periph_USART1, ENABLE);
? ? /* Connect PA9 to USARTx_Tx */
? ? GPIO_PinAFConfig(USE_USART_PORT, USE_USART_TX_GPIO_PinSource, GPIO_AF_USART1);
?
? ? /* Connect PA10 to USARTx_Rx */
? ? GPIO_PinAFConfig(USE_USART_PORT, USE_USART_RX_GPIO_PinSource, GPIO_AF_USART1);
?
? ? /* Configure USART Tx PA9 as alternate function push-pull */
? ? GPIO_InitStructure.GPIO_Pin = USE_USART_TX_PIN;
? ? GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;
? ? GPIO_InitStructure.GPIO_Speed = GPIO_Speed_40MHz;
? ? GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;
? ? GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_UP;
? ? GPIO_Init(USE_USART_PORT, &GPIO_InitStructure);
?
? ? /* Configure USART Rx PA10 as alternate function push-pull */
? ? GPIO_InitStructure.GPIO_Pin = USE_USART_RX_PIN;
? ? GPIO_Init(USE_USART_PORT, &GPIO_InitStructure);
?
? ? /* USART configuration */
? ? USART_Init(USE_USART, &USART_InitStructure);
?
? ? /* Enable USART */
? ? USART_Cmd(USE_USART, ENABLE);
}
?
3、重定向printf()
?
在工程中加入下面代碼
?
#ifdef __GNUC__
? /* With GCC/RAISONANCE, small printf (option LD Linker->Libraries->Small printf
? ? ?set to 'Yes') calls __io_putchar() */
? #define PUTCHAR_PROTOTYPE int __io_putchar(int ch)
#else
? #define PUTCHAR_PROTOTYPE int fputc(int ch, FILE *f)
? #define GETCHAR_PROTOTYPE int fgetc(FILE *f)
#endif /* __GNUC__ */
PUTCHAR_PROTOTYPE
{
? ? /* Place your implementation of fputc here */
? ? /* e.g. write a character to the USART */
? ? USART_SendData(USE_USART, (uint8_t)ch);
? ? /* Loop until transmit data register is empty */
? ? while (USART_GetFlagStatus(USE_USART, USART_FLAG_TXE) == RESET)
? ? {}
? ? return ch;
}
GETCHAR_PROTOTYPE
{
? ? while(USART_GetFlagStatus(USART1, USART_FLAG_RXNE) == RESET);
? ? return (USART_ReceiveData(USART1));
}
?
上面三個步驟做完即可在工程中調用printf()和scanf()了。
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