main.dbg.c

这是一个远程温度计 MCU: AT89S52 温度传感器: DS18B20 晶振: 12MHz 使用串口连接,在PC端使用"超级终端"打开 设置如下: 波特率: 4800 数据

/*------------------------------------------------------------------------------
main.c
------------------------------------------------------------------------------*/

#include <REG52.H>				/* special function register declarations   */
				  /* for the intended 8051 derivative         */
#include <stdio.h>				/* prototype declarations for I/O functions */
#include "ds18b20.h"

#ifdef MONITOR51				/* Debugging with Monitor-51 needs   */
char code reserve[3] _at_ 0x23;	/* space for serial interrupt if     */
#endif							/* Stop Exection with Serial Intr.   */
					 /* is enabled                        */


/*------------------------------------------------
The main C function.  Program execution starts
here after stack initialization.
------------------------------------------------*/
void main(void)
{
	uchar i;
	data DS18B20_ID id;
	data DS18B20_SCRATCH scrch;
	char s[10];

/*------------------------------------------------
Setup the serial port for 2400 baud at 12MHz.
------------------------------------------------*/
	SCON = 0x50;				/* SCON: mode 1, 8-bit UART, enable rcvr      */
	TMOD |= 0x20;				/* TMOD: timer 1, mode 2, 8-bit reload        */
	TH1 = 0xF3;					/* TH1:  reload value for 2400 baud @ 12MHz   */
	TR1 = 1;					/* TR1:  timer 1 run                          */
	TI = 1;						/* TI:   set TI to send first char of UART    */

/*------------------------------------------------
Note that an embedded program never exits (because
there is no operating system to return to).  It
must loop and execute forever.
------------------------------------------------*/
	if(! DS18B20_DeviceInit(DS18B20_PRECISION_9bit)) {
		printf("Error Device Init\n");
		while (1);
	}
	if(DS18B20_GetDeviceID(&id)) {
		printf("\nDevice ID = ");
		for (i = 0; i < DS18B20_DEVICE_ID_LENGTH; i++)
			printf("%02bX ", id.buf[i]);
		printf("\n");
	} else {
		printf("Error Get ID\n");
	}
	printf("Temperature = \n");
	while (1) {
		P1 ^= 0x01;				/* Toggle P1.0 each time we print */
		if (!DS18B20_GetScratchStart())
			continue;
		do {
			;
		} while (!DS18B20_GetScratchReady());
		if (DS18B20_GetScratch(&scrch)) {
			printf("%s\n", DS18B20_GetTemperature(s, &scrch));
		} else {
			printf("Error Get Scratch\n");
		}
	}
}