串口非阻塞发送

noblockUartSend.c

typedef unsigned char uint8_t;
typedef unsigned short uint16_t;

#define _TX //发送寄存器
#define UART_SEND_LENGTH 200

typedef struct {
	uint8_t Arr[UART_SEND_LENGTH];
	uint16_t LowIndex;
	uint16_t HighIndex;
	uint8_t IsSendingFlag;//现在正常发送
}UartSendStruct;

UartSendStruct TxSend;

void SendString(uint8_t *p,uint16_t length)
{
	int i;
	for(i=0;i<length;i++)
	{
		SendOneDataToBuf(p[i]);
	}

	if(TxSend.IsSendingFlag == 0)
	{
		TxSend.IsSendingFlag = 1;
		_TX = TxSend.Arr[TxSend.LowIndex];
		TxSend.LowIndex++;
		if(TxSend.LowIndex >= UART_SEND_LENGTH)TxSend.LowIndex = 0;
	}
}

static SendOneDataToBuf(uint8_t dat)//不对外开发
{
	TxSend.Arr[TxSend.HighIndex] = dat;
	TxSend.HighIndex++;
	if(TxSend.HighIndex >= UART_SEND_LENGTH)TxSend.HighIndex = 0;
}

void UartTxInterrupt(void)//发送中断
{
	if(TxSend.LowIndex != TxSend.HighIndex)
	{
		_TX = TxSend.Arr[TxSend.LowIndex];
		TxSend.LowIndex++;
		if(TxSend.LowIndex >= UART_SEND_LENGTH)TxSend.LowIndex = 0;
	}
	else
	{
		TxSend.IsSendingFlag = 0;
	}
}