Lora_gateway_sx1278/app/HARDWARE/sources/usart.c

#include "usart.h"

uint8_t SendBuff[SENDBUFF_SIZE];

 /**
  * @brief  配置嵌套向量中断控制器NVIC分组
  * @param  无
  * @retval 无
  */
static void NVIC_Configuration(void)
{
  NVIC_InitTypeDef NVIC_InitStructure;
  
  /* 嵌套向量中断控制器组选择 */
  NVIC_PriorityGroupConfig(NVIC_PriorityGroup_2);
  
}


 /**
  * @brief  DEBUG_USART GPIO 配置,工作模式配置。115200 8-N-1 ，中断接收模式
  * @param  无
  * @retval 无
  */
void EBT_USART_Config(void)
{
  USART_InitTypeDef USART_InitStruct;
  GPIO_InitTypeDef GPIO_InitStruct;

  // Enable USART6 clock
  RCC_APB2PeriphClockCmd(EBT_USART_CLK, ENABLE);

  // Enable GPIOC clock
  RCC_AHB1PeriphClockCmd(EBT_USART_RX_GPIO_CLK, ENABLE);

  // Configure USART6 pins
  GPIO_InitStruct.GPIO_Pin = EBT_USART_RX_PIN | EBT_USART_TX_PIN;  // USART6_TX (PC6) and USART6_RX (PC7)
  GPIO_InitStruct.GPIO_Mode = GPIO_Mode_AF;
  GPIO_InitStruct.GPIO_OType = GPIO_OType_PP;
  GPIO_InitStruct.GPIO_PuPd = GPIO_PuPd_UP;
  GPIO_InitStruct.GPIO_Speed = GPIO_Speed_50MHz;
  GPIO_Init(GPIOC, &GPIO_InitStruct);

  // Connect USART6 pins to AF8
  GPIO_PinAFConfig(EBT_USART_RX_GPIO_PORT, EBT_USART_RX_SOURCE, EBT_USART_RX_AF);
  GPIO_PinAFConfig(EBT_USART_TX_GPIO_PORT, EBT_USART_TX_SOURCE, EBT_USART_TX_AF);

  // Configure USART6
  USART_InitStruct.USART_BaudRate = EBT_USART_BAUDRATE;
  USART_InitStruct.USART_WordLength = USART_WordLength_8b;
  USART_InitStruct.USART_StopBits = USART_StopBits_1;
  USART_InitStruct.USART_Parity = USART_Parity_No;
  USART_InitStruct.USART_Mode = USART_Mode_Rx | USART_Mode_Tx;
  USART_InitStruct.USART_HardwareFlowControl = USART_HardwareFlowControl_None;
  USART_Init(EBT_USART, &USART_InitStruct);

  // Enable USART6
  USART_Cmd(EBT_USART, ENABLE);
}

/**
  * @brief  USART1 TX DMA 配置，内存到外设(USART1->DR)
  * @param  无
  * @retval 无
  */
void USART_DMA_Config(void)
{
  DMA_InitTypeDef DMA_InitStructure;

  /*开启DMA时钟*/
  RCC_AHB1PeriphClockCmd(EBT_USART_DMA_CLK, ENABLE);
  
  /* 复位初始化DMA数据流 */
  DMA_DeInit(EBT_USART_DMA_STREAM);

  /* 确保DMA数据流复位完成 */
  while (DMA_GetCmdStatus(EBT_USART_DMA_STREAM) != DISABLE)  {
  }
  DMA_InitStructure.DMA_Channel = EBT_USART_DMA_CHANNEL;  
  /*设置DMA源：串口数据寄存器地址*/
  DMA_InitStructure.DMA_PeripheralBaseAddr = EBT_USART_DR_BASE;	 
  /*内存地址(要传输的变量的指针)*/
  DMA_InitStructure.DMA_Memory0BaseAddr = (u32)SendBuff;
  /*方向：从内存到外设*/		
  DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralToMemory;	
  /*传输大小DMA_BufferSize=SENDBUFF_SIZE*/	
  DMA_InitStructure.DMA_BufferSize = SENDBUFF_SIZE;
  /*外设地址不增*/	    
  DMA_InitStructure.DMA_PeripheralInc = DMA_PeripheralInc_Disable; 
  /*内存地址自增*/
  DMA_InitStructure.DMA_MemoryInc = DMA_MemoryInc_Enable;	
  /*外设数据单位*/	
  DMA_InitStructure.DMA_PeripheralDataSize = DMA_PeripheralDataSize_Byte;
  /*内存数据单位 8bit*/
  DMA_InitStructure.DMA_MemoryDataSize = DMA_MemoryDataSize_Byte;	
  /*DMA模式：不断循环*/
  DMA_InitStructure.DMA_Mode = DMA_Mode_Circular;	 
  /*优先级：中*/	
  DMA_InitStructure.DMA_Priority = DMA_Priority_Medium;      
  /*禁用FIFO*/
  DMA_InitStructure.DMA_FIFOMode = DMA_FIFOMode_Disable;        
  DMA_InitStructure.DMA_FIFOThreshold = DMA_FIFOThreshold_Full;    
  /*存储器突发传输 16个节拍*/
  DMA_InitStructure.DMA_MemoryBurst = DMA_MemoryBurst_Single;    
  /*外设突发传输 1个节拍*/
  DMA_InitStructure.DMA_PeripheralBurst = DMA_PeripheralBurst_Single;    
  /*配置DMA2的数据流*/		   
  DMA_Init(EBT_USART_DMA_STREAM, &DMA_InitStructure);
  //配置DMA中断
	DMA_ITConfig(EBT_USART_DMA_STREAM, DMA_IT_TC, ENABLE);
	NVIC_InitTypeDef NVIC_InitStructure;
  NVIC_InitStructure.NVIC_IRQChannel = DMA2_Stream1_IRQn;
  NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 2;
  NVIC_InitStructure.NVIC_IRQChannelSubPriority = 2;
  NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
  NVIC_Init(&NVIC_InitStructure);
	
	
  /*使能DMA*/
  DMA_Cmd(EBT_USART_DMA_STREAM, ENABLE);
  
  /* 等待DMA数据流有效*/
  while(DMA_GetCmdStatus(EBT_USART_DMA_STREAM) != ENABLE)
  {
  }   
}
void DMA2_Stream1_IRQHandler() {
    if (DMA_GetITStatus(DMA2_Stream1, DMA_IT_TCIF1)) 
		{
        DMA_ClearITPendingBit(DMA2_Stream1, DMA_IT_TCIF1);
    }
}
/*
	485串口在未配置情况下，初始化的参数
*/
void USART_485_config()
{
	USART_InitTypeDef USART_InitStruct;
  GPIO_InitTypeDef GPIO_InitStruct;

  RCC_AHB1PeriphClockCmd(USART_485_CLK, ENABLE);

  RCC_AHB1PeriphClockCmd(USART_485_RX_GPIO_CLK, ENABLE);

  GPIO_InitStruct.GPIO_Pin = USART_485_RX_PIN | USART_485_TX_PIN; 
  GPIO_InitStruct.GPIO_Mode = GPIO_Mode_AF;
  GPIO_InitStruct.GPIO_OType = GPIO_OType_PP;
  GPIO_InitStruct.GPIO_PuPd = GPIO_PuPd_UP;
  GPIO_InitStruct.GPIO_Speed = GPIO_Speed_50MHz;
  GPIO_Init(GPIOC, &GPIO_InitStruct);

  GPIO_PinAFConfig(USART_485_RX_GPIO_PORT, USART_485_RX_SOURCE, USART_485_RX_AF);
  GPIO_PinAFConfig(USART_485_TX_GPIO_PORT, USART_485_TX_SOURCE, USART_485_TX_AF);

  USART_InitStruct.USART_BaudRate = USART_485_BAUDRATE;
  USART_InitStruct.USART_WordLength = USART_WordLength_8b;
  USART_InitStruct.USART_StopBits = USART_StopBits_1;
  USART_InitStruct.USART_Parity = USART_Parity_No;
  USART_InitStruct.USART_Mode = USART_Mode_Rx | USART_Mode_Tx;
  USART_InitStruct.USART_HardwareFlowControl = USART_HardwareFlowControl_None;
  USART_Init(USART_485, &USART_InitStruct);

  USART_Cmd(USART_485, ENABLE);
	USART_ITConfig(USART_485,USART_IT_RXNE,ENABLE);
	USART_ITConfig(USART_485,USART_IT_IDLE,ENABLE);
}
/*
 *  函数名：void Config_485_Port(uint32_t baudrate, uint8_t databits, uint8_t stopbits, uint8_t parity, uint8_t flowcontrol)
 *  输入参数：baudrate,databits,stopbits,parity,flowcontol 串口的配置参数
 *  输出参数：无
 *  返回值：无
 *  函数作用：根据输入参数进行配置485串口参数
 */
void Config_485_Port(uint32_t baudrate, uint8_t databits, uint8_t stopbits, uint8_t parity, uint8_t flowcontrol)
{
	uint8_t wordLength;
	if(parity!=0)
	{
		wordLength=databits+1;
  }else wordLength=databits;
	USART_InitTypeDef USART_InitStruct;
  GPIO_InitTypeDef GPIO_InitStruct;

  RCC_AHB1PeriphClockCmd(USART_485_CLK, ENABLE);

  RCC_AHB1PeriphClockCmd(USART_485_RX_GPIO_CLK, ENABLE);

   GPIO_InitStruct.GPIO_Pin = USART_485_RX_PIN | USART_485_TX_PIN; 
  GPIO_InitStruct.GPIO_Mode = GPIO_Mode_AF;
  GPIO_InitStruct.GPIO_OType = GPIO_OType_PP;
  GPIO_InitStruct.GPIO_PuPd = GPIO_PuPd_UP;
  GPIO_InitStruct.GPIO_Speed = GPIO_Speed_50MHz;
  GPIO_Init(GPIOC, &GPIO_InitStruct);

  GPIO_PinAFConfig(USART_485_RX_GPIO_PORT, USART_485_RX_SOURCE, USART_485_RX_AF);
  GPIO_PinAFConfig(USART_485_TX_GPIO_PORT, USART_485_TX_SOURCE, USART_485_TX_AF);

  USART_InitStruct.USART_BaudRate = baudrate;
  USART_InitStruct.USART_WordLength = (wordLength== 9) ? USART_WordLength_9b : USART_WordLength_8b;
  USART_InitStruct.USART_StopBits = USART_StopBits_1;
  USART_InitStruct.USART_Parity = USART_Parity_No;
	USART_InitStruct.USART_Parity =(parity == 1) ? (USART_Parity_Odd) : (parity == 2 ? USART_Parity_Even : USART_Parity_No);
	
  USART_InitStruct.USART_Mode = USART_Mode_Rx | USART_Mode_Tx;
  USART_InitStruct.USART_HardwareFlowControl = USART_HardwareFlowControl_None;
  USART_Init(USART_485, &USART_InitStruct);

  USART_Cmd(USART_485, ENABLE);
	USART_ITConfig(USART_485,USART_IT_RXNE,ENABLE);
	USART_ITConfig(USART_485,USART_IT_IDLE,ENABLE);
}
//232串口配置
void USART_232_config()
{
	USART_InitTypeDef USART_InitStruct;
  GPIO_InitTypeDef GPIO_InitStruct;

  RCC_AHB1PeriphClockCmd(USART_232_CLK, ENABLE);

  RCC_AHB1PeriphClockCmd(USART_232_RX_GPIO_CLK, ENABLE);

   GPIO_InitStruct.GPIO_Pin = USART_232_RX_PIN | USART_232_TX_PIN; 
  GPIO_InitStruct.GPIO_Mode = GPIO_Mode_AF;
  GPIO_InitStruct.GPIO_OType = GPIO_OType_PP;
  GPIO_InitStruct.GPIO_PuPd = GPIO_PuPd_UP;
  GPIO_InitStruct.GPIO_Speed = GPIO_Speed_50MHz;
  GPIO_Init(GPIOC, &GPIO_InitStruct);

  GPIO_PinAFConfig(USART_232_RX_GPIO_PORT, USART_232_RX_SOURCE, USART_232_RX_AF);
  GPIO_PinAFConfig(USART_232_TX_GPIO_PORT, USART_232_TX_SOURCE, USART_232_TX_AF);

  USART_InitStruct.USART_BaudRate = USART_232_BAUDRATE;
  USART_InitStruct.USART_WordLength = USART_WordLength_8b;
  USART_InitStruct.USART_StopBits = USART_StopBits_1;
  USART_InitStruct.USART_Parity = USART_Parity_No;
  USART_InitStruct.USART_Mode = USART_Mode_Rx | USART_Mode_Tx;
  USART_InitStruct.USART_HardwareFlowControl = USART_HardwareFlowControl_None;
  USART_Init(USART_232, &USART_InitStruct);

  USART_Cmd(USART_232, ENABLE);
	USART_ITConfig(USART_232,USART_IT_RXNE,ENABLE);
	USART_ITConfig(USART_232,USART_IT_IDLE,ENABLE);
}
/*****************  发送一个字符 **********************/
void Usart_SendByte( USART_TypeDef * pUSARTx, uint8_t ch)
{
	/* 发送一个字节数据到USART */
	USART_SendData(pUSARTx,ch);
		
	/* 等待发送数据寄存器为空 */
	while (USART_GetFlagStatus(pUSARTx, USART_FLAG_TXE) == RESET);	
}


/*****************  发送字符串 **********************/
void Usart_SendString( USART_TypeDef * pUSARTx, char *str)
{
	unsigned int k=0;
  do 
  {
      Usart_SendByte( pUSARTx, *(str + k) );
      k++;
  } while(*(str + k)!='\0');
  
  /* 等待发送完成 */
  while(USART_GetFlagStatus(pUSARTx,USART_FLAG_TC)==RESET)
  {}
}

/*****************  发送一个16位数 **********************/
void Usart_SendHalfWord( USART_TypeDef * pUSARTx, uint16_t ch)
{
	uint8_t temp_h, temp_l;
	
	/* 取出高八位 */
	temp_h = (ch&0XFF00)>>8;
	/* 取出低八位 */
	temp_l = ch&0XFF;
	
	/* 发送高八位 */
	USART_SendData(pUSARTx,temp_h);	
	while (USART_GetFlagStatus(pUSARTx, USART_FLAG_TXE) == RESET);
	
	/* 发送低八位 */
	USART_SendData(pUSARTx,temp_l);	
	while (USART_GetFlagStatus(pUSARTx, USART_FLAG_TXE) == RESET);	
}

///重定向c库函数printf到串口，重定向后可使用printf函数
int fputc(int ch, FILE *f)
{
		/* 发送一个字节数据到串口 */
		USART_SendData(USART_232, (uint8_t) ch);
		
		/* 等待发送完毕 */
		while (USART_GetFlagStatus(USART_232, USART_FLAG_TXE) == RESET);		
	
		return (ch);
}

///重定向c库函数scanf到串口，重写向后可使用scanf、getchar等函数
int fgetc(FILE *f)
{
		/* 等待串口输入数据 */
		while (USART_GetFlagStatus(USART_232, USART_FLAG_RXNE) == RESET);

		return (int)USART_ReceiveData(USART_232);
}
/*********************************************END OF FILE**********************/