uart.c

用单片机做的PWM可变的控制LED亮度的小软件

////////////////////////////////////////////////////////////////////////////////
// Copyright(C) Gniy.Liu RHOSON, Crop. 2007-2008
// Filename: uart.c
// Description: None
////////////////////////////////////////////////////////////////////////////////

#define _UART_C
#include "proj_inc.h"

#if (UART_ENABLE)

// This flag is set on USART Receiver buffer overflow
BOOL rx_buf_overflow;

void UartInit(void)
{
U08 i;
	g_bUartRxOk = FALSE;
	for(i=0;i<RX_BUF_SIZE;i++)	rx_buf[i] = 0;
	rx_wr_index=rx_cnter=0;
	for(i=0;i<TX_BUF_SIZE;i++)	tx_buf[i] = 0;
	tx_wr_index=tx_rd_index=tx_cnter=0;
	g_RxTmr = 0;
	g_TxTmr = 0;


#if (_MCUTYPE_==_MCU_STC89C52_) || (_MCUTYPE_==_MCU_W79E632_)
	SCON = 0x50;		//8 Data, 1 Stop, No Parity
	PCON |= 0x80;		//double
	RCAP2H = RELOAD_CNT_HIGH;
	RCAP2L = RELOAD_CNT_LOW;
	TH2 = RELOAD_CNT_HIGH;
	TL2 = RELOAD_CNT_LOW;
	//	T2CON	TF2 EXF2 RCLK TCLK EXEN2 TR2 C/T2 CP/RL2
	T2CON = 0x34;
	ES	= 1;
#elif (_MCUTYPE_==_MCU_M8_)
	UCSRA=0x00;
	UCSRB=0xD8;
	UCSRC=0x86;
	UBRRH = HIBYTE(UBRR_CONST);
	UBRRL = LOBYTE(UBRR_CONST);
#elif ( (_MCUTYPE_==_MCU_M64_) || (_MCUTYPE_==_MCU_M1281_) )
	UCSR0A=0x00;
	UCSR0B=0xD8;
	UCSR0C=0x86;
	UBRR0H = HIBYTE(UBRR0_CONST);
	UBRR0L = LOBYTE(UBRR0_CONST);
#endif
}


U08 PutChar(U08 c)
{
	g_TxTmr=0;

#if (_MCUTYPE_==_MCU_STC89C52_) || (_MCUTYPE_==_MCU_W79E632_)
	ES = 0;
#endif

#if (_MCUTYPE_==_MCU_STC89C52_) || (_MCUTYPE_==_MCU_W79E632_)
	if(tx_cnter)
#elif (_MCUTYPE_==_MCU_M8_)
      if(tx_cnter || ((UCSRA & DATA_REGISTER_EMPTY)==0))
#elif ( (_MCUTYPE_>=_MCU_M64_) || (_MCUTYPE_==_MCU_M1281_) )
      if(tx_cnter || ((UCSR0A & DATA_REGISTER_EMPTY)==0))
#endif
	{
		tx_buf[tx_wr_index]=c;
		if(++tx_wr_index == TX_BUF_SIZE) tx_wr_index=0;
#if ((_MCUTYPE_>=_MCU_M8_)||(_MCUTYPE_<=_MCU_M1281_))
		++tx_cnter;
#endif
	}
	else
	{
#if (_MCUTYPE_==_MCU_STC89C52_) || (_MCUTYPE_==_MCU_W79E632_)
		SBUF = c;
#elif (_MCUTYPE_==_MCU_M8_)
		UDR=c;
#elif ( (_MCUTYPE_==_MCU_M64_) || (_MCUTYPE_==_MCU_M1281_) )
		UDR0=c;
#endif
	}

#if (_MCUTYPE_==_MCU_STC89C52_) || (_MCUTYPE_==_MCU_W79E632_)
	++tx_cnter;
#endif

#if (_MCUTYPE_==_MCU_STC89C52_) || (_MCUTYPE_==_MCU_W79E632_)
	ES = 1;
#endif

	return c;
}

void PutBuf(U08 cnt)
{
U08 i;
	for(i=0; i<cnt; i++)
	{
		PutChar(g_TxBuf[i]);
	}
}

void PutStr(char flash *str)
{
	while(*str)
	{
		PutChar(*str);
		++str;
	}
}


#if (_MCUTYPE_==_MCU_STC89C52_) || (_MCUTYPE_==_MCU_W79E632_)
void UartInptIsr(void) interrupt 4 using 2
{
	if(TI)
	{
		TI=0;
		if(tx_cnter>1)
		{
			--tx_cnter;
			SBUF = tx_buf[tx_rd_index];
			if (++tx_rd_index == TX_BUF_SIZE) tx_rd_index=0;
		}
		else	tx_cnter = 0;
		g_TxTmr = 0;
	}
	if(RI)
	{
		RI=0;
		rx_buf[rx_wr_index] = SBUF;
		if(++rx_wr_index == RX_BUF_SIZE)	rx_wr_index = 0;
		if(++rx_cnter == RX_BUF_SIZE)
		{
			rx_cnter = 0;
			rx_buf_overflow = 1;
		}
		g_RxTmr = C_RX_TIMEOUT;
	}
}
#endif

#if ((_MCUTYPE_>=_MCU_M8_)&&(_MCUTYPE_<=_MCU_M1281_))
#if (_MCUTYPE_==_MCU_M8_)
#pragma vector=USART_RXC_vect
#elif (_MCUTYPE_ == _MCU_M64_)
#pragma vector=USART0_RXC_vect
#elif (_MCUTYPE_==_MCU_M1281_)
#pragma vector=USART0_RX_vect
#endif
__interrupt void usart0_rx_isr(void)
{
	char status,data;
#if (_MCUTYPE_==_MCU_M8_)
	status=UCSRA;
	data=UDR;
#elif ( (_MCUTYPE_==_MCU_M64_) || (_MCUTYPE_==_MCU_M1281_) )
	status=UCSR0A;
	data=UDR0;
#endif

	if ((status & (FRAMING_ERROR | PARITY_ERROR | DATA_OVERRUN))==0)
	{
		rx_buf[rx_wr_index]=data;
		if (++rx_wr_index == RX_BUF_SIZE) rx_wr_index=0;
		if (++rx_cnter == RX_BUF_SIZE)
		{
			rx_cnter=0;
			rx_buf_overflow=1;
		}
	}
	g_RxTmr = C_RX_TIMEOUT;
}

#if (_MCUTYPE_==_MCU_M8_)
#pragma vector=USART_TXC_vect
#elif (_MCUTYPE_ == _MCU_M64_)
#pragma vector=USART0_TXC_vect
#elif (_MCUTYPE_==_MCU_M1281_)
#pragma vector=USART0_TX_vect
#endif
__interrupt void usart0_tx_isr(void)
{
	if (tx_cnter)
	{
		--tx_cnter;
#if (_MCUTYPE_==_MCU_M8_)
		UDR=tx_buf[tx_rd_index];
#elif ( (_MCUTYPE_==_MCU_M64_) || (_MCUTYPE_==_MCU_M1281_) )
		UDR0=tx_buf[tx_rd_index];
#endif
		if (++tx_rd_index == TX_BUF_SIZE) tx_rd_index=0;
		g_TxTmr = 0;
	}
}
#endif



#endif	//	#if (UART_ENABLE)