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Usart采用循环队列的中断程序.rar
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- /*******************************************************************************
- STM32学习日志(14)----Usart使用环形队列的串口驱动程序
- 编译环境: EWARM V5.30
- 硬件环境: 51hei
- STM32 FW: V3.0.0
- 作者 : szlihongtao
- 时间 : 2016-07-11
- 说明 : 1. 参考了IAR的应用笔记 AppNote430-03.pdf
- 2.与PC联机通讯,收发测试均OK!
- *******************************************************************************/
- #include "stm32f10x.h"
- #include "stm32_m.h"
- #include "sci.h"
- //******************************************************************************
- static void delayms(INT16U cnt)
- {
- INT16U i;
- while(cnt--)
- for (i=0; i<7333; i++);
- }
- //******************************************************************************
- // 时钟设置初始化
- //******************************************************************************
- static void RCC_Configuration(void)
- {
- ErrorStatus HSEStartUpStatus;
- /*
- RCC_AdjustHSICalibrationValue 调整内部高速晶振(HSI)校准值
- RCC_ITConfig 使能或者失能指定的RCC中断
- RCC_ClearFlag 清除RCC的复位标志位
- RCC_GetITStatus 检查指定的RCC中断发生与否
- RCC_ClearITPendingBit 清除RCC的中断待处理位
- */
- /* RCC system reset(for debug purpose) */
- // 时钟系统复位
- RCC_DeInit();
- // 使能外部的8M晶振
- // 设置外部高速晶振(HSE)
- /* Enable HSE */
- RCC_HSEConfig(RCC_HSE_ON);
- // 使能或者失能内部高速晶振(HSI)
- RCC_HSICmd(DISABLE);
- // 等待HSE起振
- // 该函数将等待直到HSE就绪,或者在超时的情况下退出
- /* Wait till HSE is ready */
- HSEStartUpStatus = RCC_WaitForHSEStartUp();
- if(HSEStartUpStatus == SUCCESS)
- {
- /* HCLK = SYSCLK */
- // 设置AHB时钟(HCLK)
- RCC_HCLKConfig(RCC_SYSCLK_Div1); // 72 MHz
- /* PCLK1 = HCLK/2 */
- // 设置低速AHB时钟(PCLK1)
- RCC_PCLK1Config(RCC_HCLK_Div2); // 36 MHz
- /* PCLK2 = HCLK */
- // 设置高速AHB时钟(PCLK2)
- RCC_PCLK2Config(RCC_HCLK_Div1); // 72 MHz
- /* ADCCLK = PCLK2/8 */
- // 设置ADC时钟(ADCCLK)
- RCC_ADCCLKConfig(RCC_PCLK2_Div8);
- // 设置USB时钟(USBCLK)
- // USB时钟 = PLL时钟除以1.5
- RCC_USBCLKConfig(RCC_USBCLKSource_PLLCLK_1Div5);
- // 设置外部低速晶振(LSE)
- RCC_LSEConfig(RCC_LSE_OFF);
- // 使能或者失能内部低速晶振(LSI)
- // LSE晶振OFF
- RCC_LSICmd(DISABLE);
- // 设置RTC时钟(RTCCLK)
- // 选择HSE时钟频率除以128作为RTC时钟
- RCC_RTCCLKConfig(RCC_RTCCLKSource_HSE_Div128);
- // 使能或者失能RTC时钟
- // RTC时钟的新状态
- RCC_RTCCLKCmd(DISABLE);
- /* Flash 2 wait state */
- FLASH_SetLatency(FLASH_Latency_2);
- /* Enable Prefetch Buffer */
- FLASH_PrefetchBufferCmd(FLASH_PrefetchBuffer_Enable);
- /* PLLCLK = 8MHz * 9 = 72 MHz */
- // 设置PLL时钟源及倍频系数
- RCC_PLLConfig(RCC_PLLSource_HSE_Div1, RCC_PLLMul_9);
- /* Enable PLL */
- // 使能或者失能PLL
- RCC_PLLCmd(ENABLE);
- /* Wait till PLL is ready */
- // 检查指定的RCC标志位设置与否
- while(RCC_GetFlagStatus(RCC_FLAG_PLLRDY) == RESET)
- {
- }
- /* Select PLL as system clock source */
- // 设置系统时钟(SYSCLK)
- RCC_SYSCLKConfig(RCC_SYSCLKSource_PLLCLK);
- /* Wait till PLL is used as system clock source */
- // 返回用作系统时钟的时钟源
- while(RCC_GetSYSCLKSource() != 0x08)
- {
- }
- }
- // 使能或者失能AHB外设时钟
- RCC_AHBPeriphClockCmd(RCC_AHBPeriph_DMA1
- |RCC_AHBPeriph_DMA2
- |RCC_AHBPeriph_SRAM
- |RCC_AHBPeriph_FLITF
- |RCC_AHBPeriph_CRC
- |RCC_AHBPeriph_FSMC
- |RCC_AHBPeriph_SDIO,DISABLE);
- // 使能或者失能APB1外设时钟
- RCC_APB1PeriphClockCmd(RCC_APB1Periph_ALL,DISABLE);
- // 强制或者释放高速APB(APB2)外设复位
- RCC_APB2PeriphResetCmd(RCC_APB2Periph_ALL,ENABLE);
- // 退出复位状态
- RCC_APB2PeriphResetCmd(RCC_APB2Periph_ALL,DISABLE);
- // 强制或者释放低速APB(APB1)外设复位
- RCC_APB1PeriphResetCmd(RCC_APB1Periph_ALL,ENABLE);
- // 退出复位状态
- RCC_APB1PeriphResetCmd(RCC_APB1Periph_ALL,DISABLE);
- // 强制或者释放后备域复位
- RCC_BackupResetCmd(ENABLE);
- // 使能或者失能时钟安全系统
- RCC_ClockSecuritySystemCmd(DISABLE);
- }
- //******************************************************************************
- // NVIC设置
- //******************************************************************************
- static void NVIC_Configuration(void)
- {
- }
- //******************************************************************************
- // GPIO设置
- //******************************************************************************
- static void GPIO_Configuration(void)
- {
- GPIO_InitTypeDef GPIO_InitStructure;
- RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA|RCC_APB2Periph_GPIOC|RCC_APB2Periph_AFIO, ENABLE);
- GPIO_InitStructure.GPIO_Pin = GPIO_Pin_4|GPIO_Pin_5;
- GPIO_InitStructure.GPIO_Speed = GPIO_Speed_2MHz;
- GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;
- GPIO_Init(GPIOC, &GPIO_InitStructure);
- GPIO_InitStructure.GPIO_Pin = GPIO_Pin_6 | GPIO_Pin_7 | GPIO_Pin_8 | GPIO_Pin_9;
- GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;
- GPIO_Init(GPIOC, &GPIO_InitStructure);
- //------------------------------------------------------------------------------
- GPIO_InitStructure.GPIO_Pin = GPIO_Pin_10;// USART1 Rx (PA.10)
- GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;
- GPIO_Init(GPIOA, &GPIO_InitStructure);
- /* Configure USART1 Tx (PA.09) as alternate function push-pull */
- GPIO_InitStructure.GPIO_Pin = GPIO_Pin_9;
- GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
- GPIO_Init(GPIOA, &GPIO_InitStructure);
- }
- //******************************************************************************
- // LED5亮
- //******************************************************************************
- void Led_RW_ON(void)
- {
- GPIO_SetBits(GPIOC,GPIO_Pin_4);
- }
- //******************************************************************************
- // LED5灭
- //******************************************************************************
- void Led_RW_OFF(void)
- {
- GPIO_ResetBits(GPIOC,GPIO_Pin_4);
- }
- //******************************************************************************
- // 主程序
- //******************************************************************************
- int main(void)
- {
- INT16U i;
- RCC_Configuration();
- GPIO_Configuration();
- NVIC_Configuration();
- OpenCom();
- for (i=0;i<3;++i)
- {
- Led_RW_ON();
- delayms(200);
- Led_RW_OFF();
- delayms(200);
- }
- //------------------------------------------------------------------------------
- for (;;)
- {
- putch_int(i++);
- CR();
- delayms(10);
- GPIOC->ODR ^= GPIO_Pin_5; // led4 toogle
- }
- }
- //******************************************************************************
- #ifdef USE_FULL_ASSERT
- /**
- * @brief Reports the name of the source file and the source line number
- * where the assert_param error has occurred.
- * @param file: pointer to the source file name
- * @param line: assert_param error line source number
- * @retval : None
- */
- void assert_failed(uint8_t* file, uint32_t line)
- {
- /* User can add his own implementation to report the file name and line number,
- ex: printf("Wrong parameters value: file %s on line %d\r\n", file, line) */
- /* Infinite loop */
- while (1)
- {
- }
- }
- #endif
- /**
- * @}
- */
- //******************************************************************************
- /******************* (C) COPYRIGHT 2009 STMicroelectronics *****END OF FILE****/
- //******************************************************************************
- /*
- LED2---------PC7
- LED3---------PC6
- LED4---------PC5
- LED5---------PC4
- KEY2---------PD3
- KEY3---------PD4
- */
复制代码- //******************************************************************************
- #include "stm32_m.h"
- #include "stm32f10x.h"
- #include "sci.h"
- //******************************************************************************
- struct struct_sci str_sci;
- //******************************************************************************
- void isr_USART1_IRQHandler(void)
- {
- if (USART_GetITStatus(USART1,USART_IT_TC)!= RESET) // 发送中断
- {
- if (str_sci.ucTXCharCount) // 如果还有发送的字符数
- {
- USART_SendData(USART1,str_sci.ucTXBuffer[str_sci.ucTXReadIndex++]);
- str_sci.ucTXReadIndex &= TXBUFSIZE-1; // adjust index
- str_sci.ucTXCharCount--; // char sent, dec count
- }
- else // 发送缓冲区为空
- str_sci.bTXBufferEmpty = BUFFER_EMPTY; // 设置空标志
- USART_ClearITPendingBit(USART1,USART_IT_TC);
- }
- //------------------------------------------------------------------------------
- if (USART_GetITStatus(USART1,USART_IT_RXNE)!= RESET) // 接收中断
- {
- str_sci.ucRXBuffer[str_sci.ucRXWriteIndex++] =(INT8U)USART_ReceiveData(USART1);; // store received byte and
- str_sci.ucRXWriteIndex &= RXBUFSIZE-1; // reset index
- str_sci.ucRXCharCount++; // received, inc count
- USART_ClearITPendingBit(USART1,USART_IT_RXNE);
- }
- }
- //******************************************************************************
- // 读取若干字节
- //******************************************************************************
- INT8U ComRd(INT8U buf[], INT8U maxCnt)
- {
- INT16U i;
- for (i=0;i<maxCnt;++i)
- buf[i]=ComRdByte();
- return (SUCCESS);
- }
- //******************************************************************************
- // 读取1字节
- //******************************************************************************
- INT8U ComRdByte(void)
- {
- INT8U ch;
- //RX_INT_DISABLE; // disable rx interrupt (IE2)
- USART_ITConfig(USART1, USART_IT_RXNE, DISABLE);
- ch = str_sci.ucRXBuffer[str_sci.ucRXReadIndex++]; // get byte from buffer
- str_sci.ucRXReadIndex &= RXBUFSIZE-1; // adjust index
- str_sci.ucRXCharCount--; // one char read, dec count
- USART_ITConfig(USART1, USART_IT_RXNE, ENABLE);
- //RX_INT_ENABLE; // done, enable int (IE2)
- return (ch);
- }
- //******************************************************************************
- // 发送字符串
- //******************************************************************************
- void putstring(INT8U *ptr,INT8U length)
- {
- for(;length;--length)
- ComWrtByte(*ptr++);
- }
- //******************************************************************************
- void putch_int(uint int1)
- {
- INT8U i,arr[5];
- for(i=0;i<5;++i)
- {
- arr[4-i]=(int1%10)+'0';
- int1/=10;
- }
- #if 0
- for(i=0;i<4;++i)
- {
- if (arr[i]=='0')
- arr[i]=' ';
- else
- break;
- }
- #endif
- putstring(arr,5);
- }
- //******************************************************************************
- void CR(void)
- {
- ComWrtByte('\r');
- ComWrtByte('\n'); // 回车换行
- }
- //******************************************************************************
- // 写若干字节
- //******************************************************************************
- INT8U ComWrt(INT8U *buf, INT8U maxCnt)
- {
- INT8U i;
- for (i=0;i<maxCnt;++i)
- ComWrtByte(buf[i]);
- return (SUCCESS);
- }
- //******************************************************************************
- // 写1字节
- //******************************************************************************
- INT8U ComWrtByte(INT8U byte)
- {
- INT16U i;
- //加此句,为了防止一次性发送较多数据时,发送区溢出
- //ucTXCharCount表示还未发送的字符
- while(GetOutQLen()>(TXBUFSIZE-16))
- for(i=0;i<250;++i); // 延时
- str_sci.ucTXBuffer[str_sci.ucTXWriteIndex++]= byte; // load byte to buffer and inc index
- str_sci.ucTXWriteIndex &= TXBUFSIZE-1; // adjust index to borders of buffer
- //TX_INT_DISABLE; // disable transmit interrupt (in IE2)
- USART_ITConfig(USART1, USART_IT_TC, DISABLE);
- ++str_sci.ucTXCharCount; // new char, inc count
- USART_ITConfig(USART1, USART_IT_TC, ENABLE);
- //TX_INT_ENABLE; // enable interrupt (in IE2)
- if ((str_sci.bTXBufferEmpty)
- && (str_sci.ucTXCharCount)) // buffer had been empty
- {
- str_sci.bTXBufferEmpty = !BUFFER_EMPTY; // 复位发送缓冲区空标志,表明有数据等待发送
- i=str_sci.ucTXBuffer[str_sci.ucTXReadIndex++]; // load tx register, inc index
- USART_SendData(USART1,i);
- str_sci.ucTXReadIndex &= TXBUFSIZE-1; // adjust index
- str_sci.ucTXCharCount--; // char sent, dec count
- }
- return (SUCCESS);
- }
- //******************************************************************************
- // 清空输入缓冲区
- //******************************************************************************
- INT8U FlushInQ(void)
- {
- INT16U i;
- for(i=0;i<RXBUFSIZE;++i)
- str_sci.ucRXBuffer[i]=0;
- str_sci.ucRXReadIndex=0;
- str_sci.ucRXWriteIndex=0;
- str_sci.ucRXCharCount=0;
- return (SUCCESS);
- }
- //******************************************************************************
- // 清空输出缓冲区
- //******************************************************************************
- INT8U FlushOutQ(void)
- {
- INT16U i;
- for(i=0;i<TXBUFSIZE;++i)
- str_sci.ucTXBuffer[i] =0;
- str_sci.ucTXReadIndex=0;
- str_sci.ucTXWriteIndex=0;
- str_sci.ucTXCharCount=0;
- str_sci.bTXBufferEmpty=BUFFER_EMPTY; // 发送缓冲区为空标志,flag for synchronization
- return (SUCCESS);
- }
- //******************************************************************************
- // 读取端口状态
- //******************************************************************************
- INT8U GetComStat(void)
- {
- return (SUCCESS);
- }
- //******************************************************************************
- // 读取输入缓冲区的程度
- //******************************************************************************
- INT16U GetInQLen(void)
- {
- return (str_sci.ucRXCharCount);
- }
- //******************************************************************************
- // 读取输出缓冲区的程度
- //******************************************************************************
- INT16U GetOutQLen(void)
- {
- return (str_sci.ucTXCharCount);
- }
- //******************************************************************************
- // 打开/设置串口
- //******************************************************************************
- INT8U OpenCom(void)
- {
- USART_InitTypeDef USART_InitStructure;
- NVIC_InitTypeDef NVIC_InitStructure;
- USART_TypeDef* USARTx;
- INT16U NVIC_IRQCh;
- RCC_APB2PeriphClockCmd(RCC_APB2Periph_USART1, ENABLE);
- NVIC_IRQCh=USART1_IRQn;
- USARTx=USART1;
- USART_DeInit(USARTx);
- //USART_ClockInitStructure.USART_Clock = USART_Clock_Enable;
- //USART_ClockInitStructure.USART_CPOL = USART_CPOL_High;
- //USART_ClockInitStructure.USART_CPHA = USART_CPHA_2Edge;
- //USART_ClockInitStructure.USART_LastBit = USART_LastBit_Enable;
- //USART_ClockInit(USARTx, &USART_ClockInitStructure);
- // 注意,只支持USART1,2,3,而不支持4,5
- USART_InitStructure.USART_BaudRate = 38400;
- 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_Init(USARTx, &USART_InitStructure);
- USART_ClearFlag(USARTx,USART_FLAG_TC|USART_FLAG_RXNE);
- USART_ITConfig(USARTx, USART_IT_TC, ENABLE);
- USART_ITConfig(USARTx, USART_IT_RXNE, ENABLE);
- NVIC_InitStructure.NVIC_IRQChannel = NVIC_IRQCh;
- NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;
- NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;
- NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
- NVIC_Init(&NVIC_InitStructure);
- USART_Cmd(USARTx, ENABLE);
- return (SUCCESS);
- }
- //******************************************************************************
- // 打开/设置串口
- //******************************************************************************
- INT8U CloseCom(void)
- {
- NVIC_InitTypeDef NVIC_InitStructure;
- USART_TypeDef* USARTx;
- INT16U NVIC_IRQCh;
- NVIC_IRQCh=USART1_IRQn;
- USARTx=USART1;
- RCC_APB2PeriphClockCmd(RCC_APB2Periph_USART1,DISABLE);
- USART_DeInit(USARTx);
- USART_ITConfig(USARTx, USART_IT_TC, DISABLE);
- USART_ITConfig(USARTx, USART_IT_RXNE, DISABLE);
- NVIC_InitStructure.NVIC_IRQChannel = NVIC_IRQCh;
- NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;
- NVIC_InitStructure.NVIC_IRQChannelCmd = DISABLE;
- NVIC_Init(&NVIC_InitStructure);
- USART_Cmd(USARTx, DISABLE);
- FlushInQ();
- FlushOutQ();
- return (SUCCESS);
- }
- //******************************************************************************
- // 设置串口的超时等待时间
- //******************************************************************************
- INT8U SetComTime(INT8U portNo, INT8U second_ms)
- {
- portNo=portNo;
- second_ms=second_ms;
- return (SUCCESS);
- }
- //******************************************************************************
- //******************************************************************************
- //******************************************************************************
复制代码
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