uartdebug.c

adhoc信息节点程序源代码（点对多点）——for atmega128

#include "uartDebug.h"
#include "type.h"

#define DBG_BUF_LEN 40
#define ADVANCE(x) x = (((x+1) >= DBG_BUF_LEN) ? 0 : x+1)  // from TXMAN.c
#define UART_IDLE 0
#define UART_BUSY 1

char UARTState;
char dbgBuf[DBG_BUF_LEN];
uint8_t dbgHead;
uint8_t dbgTail;
uint8_t dbgBufCount;

void uartDebug_init()
{
   UARTState = UART_IDLE;
   dbgBufCount = 0;
   dbgHead = 0;
   dbgTail = 0;
   // initialize UART
    * (volatile unsigned char *)0x90 = 0;		    /* UBRR0H = 0 */
	* (volatile unsigned char *)(0x09 + 0x20) = 15;	/* UBRR0L = 15 */	
	/* UCSR0A中的U2X0 = 1,即传输速率倍速 */
	* (volatile unsigned char *)(0x0B + 0x20) = 1 << 1;	
	/* UCSR0C中UCSZ1 = 1,UCSZ0 = 1,即传送或接收字符长为8bit */
	* (volatile unsigned char *)0x95 = (1 << 2) | (1 << 1);	
	/* UCSR0B中的RXCIE,TXCIE,RXEN和TXEN都置为1 */
    * (volatile unsigned char *)(0x0A + 0x20) = (((1 << 7) | (1 << 6)) | (1 << 4)) | (1 << 3);		 
}

void uartDebug_txByte(char byte)
{
	if (UARTState == UART_IDLE) { // send byte if UART is idle 
      UARTState = UART_BUSY;
	  * (volatile unsigned char *)(0x0C + 0x20) = byte;		/* 将data写入数据寄存器UDR0 */
	  * (volatile unsigned char *)(0x0B + 0x20) |= 1 << 6;	/* 向TXC位写逻辑1,从而清零该位 */
	}
	else
	{
		if (dbgBufCount < DBG_BUF_LEN) {
           dbgBuf[dbgTail] = byte;
           ADVANCE(dbgTail);
           dbgBufCount++;
        }
	}
}

/***************************************************************************
                      __vector_20(void)
*功能描述：UART发送完成中断
*参数说明：无
*返回值：  无
**************************************************************************/

void __attribute((interrupt))   __vector_20(void)
{
	char byte;
    if(dbgBufCount > 0) {
      byte = dbgBuf[dbgHead];
      ADVANCE(dbgHead);
      dbgBufCount--;
	  * (volatile unsigned char *)(0x0C + 0x20) = byte;		/* 将data写入数据寄存器UDR0 */
	  * (volatile unsigned char *)(0x0B + 0x20) |= 1 << 6;	/* 向TXC位写逻辑1,从而清零该位 */
	 } else {
      UARTState = UART_IDLE;
     }

}

/***************************************************************************
                      __vector_18(void)

*功能描述：UART接收完成中断
*参数说明：无
*返回值：  无
**************************************************************************/

void __attribute((signal))   __vector_18(void)
{
}