#include "stm32f10x_lib.h"
//#define TxBufferSize (countof(TxBuffer) - 1)
//#define RxBufferSize 0x65
//#define countof(a) (sizeof(a) / sizeof(*(a)))
//u8 TxBuffer[] = "\n\r Stm32.USART->Computer \n\n\r";
//u8 RxBuffer[RxBufferSize];
//u8 NbrOfDataToTransfer = TxBufferSize;
//u8 NbrOfDataToRead = RxBufferSize;
//u8 TxCounter = 0;
//u16 RxCounter = 0;
USART_InitTypeDef USART_InitStructure;
ErrorStatus HSEStartUpStatus;
void RCC_Configuration(void);
void GPIO_Configuration(void);
void NVIC_Configuration(void);
u32 USART_Scanf(u32 value);
int main(void)
{
#ifdef DEBUG
debug();
#endif
RCC_Configuration();
NVIC_Configuration();
GPIO_Configuration();
USART_InitStructure.USART_BaudRate = 9600;
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); /* Configure the USART1 */
USART_ITConfig(USART1, USART_IT_TXE, ENABLE); /* Enable the USART Transmoit interrupt: this interrupt is generated when the USART1 transmit data register is empty */
USART_ITConfig(USART1, USART_IT_RXNE, ENABLE); /* Enable the USART Receive interrupt: this interrupt is generated when the USART1 receive data register is not empty */
USART_Cmd(USART1, ENABLE); /* Enable USART1 */
while (1)
{
/*
if(USART_GetITStatus(USART1, USART_IT_RXNE) != RESET)
{
RxBuffer[RxCounter++] = (USART_ReceiveData(USART1) & 0xFF);
USART_SendData(USART1, RxBuffer[RxCounter-1]);
USART_ClearITPendingBit(USART1, USART_IT_RXNE);
if(RxCounter == NbrOfDataToRead)
{
USART_ITConfig(USART1, USART_IT_RXNE, DISABLE);
}
}
if(USART_GetITStatus(USART1, USART_IT_TXE) != RESET)
{
USART_SendData(USART1, TxBuffer[TxCounter++]);
USART_ClearITPendingBit(USART1, USART_IT_TXE);
if(TxCounter == NbrOfDataToTransfer)
{
USART_ITConfig(USART1, USART_IT_TXE, DISABLE);
}
}*/
}
}
void RCC_Configuration(void)
{
RCC_DeInit();
RCC_HSEConfig(RCC_HSE_ON);
HSEStartUpStatus = RCC_WaitForHSEStartUp();
if(HSEStartUpStatus == SUCCESS)
{
FLASH_PrefetchBufferCmd(FLASH_PrefetchBuffer_Enable);
FLASH_SetLatency(FLASH_Latency_2);
RCC_HCLKConfig(RCC_SYSCLK_Div1);
RCC_PCLK2Config(RCC_HCLK_Div1);
RCC_PCLK1Config(RCC_HCLK_Div2);
RCC_PLLConfig(RCC_PLLSource_HSE_Div1, RCC_PLLMul_9);
RCC_PLLCmd(ENABLE);
while(RCC_GetFlagStatus(RCC_FLAG_PLLRDY) == RESET)
{
}
RCC_SYSCLKConfig(RCC_SYSCLKSource_PLLCLK);
while(RCC_GetSYSCLKSource() != 0x08)
{
}
}
/* Enable GPIOA and USART1 clocks */
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA | RCC_APB2Periph_USART1, ENABLE);
}
void GPIO_Configuration(void)
{
GPIO_InitTypeDef GPIO_InitStructure;
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_9;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
GPIO_Init(GPIOA, &GPIO_InitStructure);
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_10;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;
GPIO_Init(GPIOA, &GPIO_InitStructure);
}
void NVIC_Configuration(void)
{
NVIC_InitTypeDef NVIC_InitStructure;
#ifdef VECT_TAB_RAM
NVIC_SetVectorTable(NVIC_VectTab_RAM, 0x0);
#else /* VECT_TAB_FLASH */
NVIC_SetVectorTable(NVIC_VectTab_FLASH, 0x0);
#endif
NVIC_InitStructure.NVIC_IRQChannel = USART1_IRQChannel;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
NVIC_Init(&NVIC_InitStructure);
}
#ifdef DEBUG
void assert_failed(u8* file, u32 line)
{
while (1)
{
}
}
#endif
中斷程序：
#include "stm32f10x_it.h"
#define TxBufferSize (countof(TxBuffer) - 1)
#define RxBufferSize 0x51
#define countof(a) (sizeof(a) / sizeof(*(a)))
u8 TxBuffer[] = "\n\r Stm32.USART->Computer \n\n\r";
u8 RxBuffer[RxBufferSize];
u8 NbrOfDataToTransfer = TxBufferSize;
u8 NbrOfDataToRead = RxBufferSize;
u8 TxCounter = 0;
u16 RxCounter = 0;
void USART1_IRQHandler(void)
{
/*
if(USART_GetITStatus(USART1, USART_IT_RXNE) != RESET)
{
RxBuffer[RxCounter++] = (USART_ReceiveData(USART1) & 0xFF);
USART_ClearITPendingBit(USART1, USART_IT_RXNE);
if(RxCounter == NbrOfDataToRead)
{
USART_ITConfig(USART1, USART_IT_RXNE, DISABLE);
}
}
if(USART_GetITStatus(USART1, USART_IT_TXE) != RESET)
{
USART_SendData(USART1, TxBuffer[TxCounter++]);
USART_ClearITPendingBit(USART1, USART_IT_TXE);
if(TxCounter == NbrOfDataToTransfer)
{
USART_ITConfig(USART1, USART_IT_TXE, DISABLE);
}
}
*/
if(USART_GetITStatus(USART1, USART_IT_RXNE) != RESET)
{
RxBuffer[RxCounter++] = (USART_ReceiveData(USART1) & 0xFF);
USART_SendData(USART1, RxBuffer[RxCounter-1]);
USART_ClearITPendingBit(USART1, USART_IT_RXNE);
if(RxCounter == NbrOfDataToRead)
{
USART_ITConfig(USART1, USART_IT_RXNE, DISABLE);
}
}
if(USART_GetITStatus(USART1, USART_IT_TXE) != RESET)
{
USART_SendData(USART1, TxBuffer[TxCounter++]);
USART_ClearITPendingBit(USART1, USART_IT_TXE);
if(TxCounter == NbrOfDataToTransfer)
{
USART_ITConfig(USART1, USART_IT_TXE, DISABLE);
}
}
}
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