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神啊，救救我吧。(程序很奇怪的问题,恳求高手)我学着用Keil C,CPU是AT89C52,写的是一个AD转换。
源码如下：
#--------------------------------------------adc0809.h----------------------------------------
#define XBYTE ((unsigned char volatile xdata *)0x0)
#define AdcAddress XBYTE[0] //ADC0809编在地址0，用P1.4做片选信号。
//中断用IT1
/*typedef struct
{
unsigned char ADC_DATA_READY;
unsigned char CHANNEL;
unsigned char ADC_DATA;
}ADC_DATA;*/
unsigned char startadc(unsigned char channel);
void init_adc(void);
#-------------------------------------------adc0809.c------------------------------------------
#include "reg591.h"
#include "adc0809.h"
unsigned char adc_data_ready,adc_data;
void init_adc(void)
{
adc_data_ready=1;
IT1=1;//下降延触发。
T2CON_1=0; //以下用T2产生clock信号给ADC0809.//大约700khz.
T2CON_2=1;
T2MOD=0x02;
RCAP2L=0xfa;
RCAP2H=0xff;
}
unsigned char startadc(unsigned char channel)
{
if(adc_data_ready==0) return 0;
EX1=1;//Enable ADC Interrupt;
P1_4=0;
adc_data_ready=0; //ADC工作中
AdcAddress=channel;
P1_4=1;
return 1;
}
void interrupt_read_adc(void) interrupt 2
{
// toggle_red_led(1); 我测试用的，亮个灯而已。
EX1=0; //Disable ADC Interrupt
P1_4=0;
adc_data=AdcAddress;
P1_4=1;
adc_data_ready=1; //问题就处在这里啊这里啊。
}
#-----------------------------------------------main.c--------------------------------------------
#include "reg591.h"
#include "adc0809.h"
extern unsigned char adc_data_ready,adc_data;
unsigned int timer1tick;//定时器用的。
unsigned int t1reload;
void init_timer1 (unsigned int reload)
{
t1reload = reload;
timer1tick = 0;
TR1 = 0; /* timer 1: stop */
TMOD |= 0x10; /* mode 1 */
IP1 |= 2; /* priority */
TH1 = reload / 256;
TL1 = reload % 256;
TR1 = 1; /* timer 1: start */
ET1 = 1; /* enable timer 1 int */
EA = 1;
}
void t1isr (void) interrupt 3
{
TR1 = 0; /* timer 1: stop */
TH1 = t1reload / 256;
TL1 = t1reload % 256; /* reload value */
TR1 = 1; /* timer 1: restart */
timer1tick++;
}
void main(void)
{
init_adc();
init_timer1(45535);
while(1){
if (timer1tick> =100)
{
if (startadc(0)){
timer1tick=0;
while(adc_data_ready==0);//问题是这里永远都是0,郁闷啊。
//adc_data然后我们就可以处理ADC_DATA了。
}
}
}
}
#-----------------------------------reg591.h-------------------------------------------------------
/* (c) Copyright PHYTEC ELEKTRONIK GmbH. 1999, All rights reserved. */
/* 80591 Processor Declarations */
/* PWM names corrected by ESAcademy, June 2000 */
/* BYTE Registers */
sfr P0 = 0x80;
sfr P1 = 0x90;
sfr P2 = 0xA0;
sfr P3 = 0xB0;
sfr PSW = 0xD0;
sfr ACC = 0xE0;
sfr B = 0xF0;
sfr SP = 0x81;
sfr DPL = 0x82;
sfr DPH = 0x83;
sfr PCON = 0x87;
sfr TCON = 0x88;
sfr TMOD = 0x89;
sfr TL0 = 0x8A;
sfr TL1 = 0x8B;
sfr TH0 = 0x8C;
sfr TH1 = 0x8D;
sfr IEN0 = 0xA8;
sfr IEN1 = 0xE8;
sfr IP0 = 0xB8;
sfr IP0H = 0xB7;
sfr IP1 = 0xF8;
sfr IP1H = 0xF7;
sfr S0CON = 0x98;
sfr S0BUF = 0x99;
sfr S0ADDR= 0xCB;
sfr S0ADEN= 0xF9;
sfr S0PSL = 0xFA;
sfr S0PSH = 0xFB;
sfr S1CON = 0xD8;
sfr S1ADR = 0xDB;
sfr S1DAT = 0xDA;
sfr S1STA = 0xD9;
sfr CML0 = 0xA9;
sfr CML1 = 0xAA;
sfr CML2 = 0xAB;
sfr CTL0 = 0xAC;
sfr CTL1 = 0xAD;
sfr CTL2 = 0xAE;
sfr CTL3 = 0xAF;
sfr ADCON = 0xC5;
sfr ADCH = 0xC6;
sfr TM2IR = 0xC8;
sfr T2CON = 0xC8;
sfr T2MOD = 0xC9;
sfr RCAP2L = 0xCA;
sfr RCAP2H = 0xCB;
sbit T2CON_1 = 0xC9;
sbit T2CON_2 = 0xCA;
sfr CMH0 = 0xC9;
sfr CMH1 = 0xCA;
sfr CMH2 = 0xCB;
sfr CTH0 = 0xCC;
sfr CTH1 = 0xCD;
sfr CTH2 = 0xCE;
sfr CTH3 = 0xCF;
sfr CANSTA= 0xC0;
sfr CANCON= 0xC3;
sfr CANDAT= 0xC2;
sfr CANADR= 0xC1;
sfr CANMOD= 0xC4;
sfr TM2CON= 0xEA;
sfr CTCON = 0xEB;
sfr TML2 = 0xEC;
sfr TMH2 = 0xED;
sfr STE = 0xEE;
sfr RTE = 0xEF;
sfr PWM0 = 0xFC;
sfr PWM1 = 0xFD;
sfr PWMP = 0xFE;
sfr T3 = 0xFF;
sfr AUXR = 0x8E;
sfr AUXR1 = 0xA2;
sfr P1M1 = 0x92;
sfr P1M2 = 0x93;
sfr P2M1 = 0x94;
sfr P2M2 = 0x95;
sfr P3M1 = 0x9A;
sfr P3M2 = 0x9B;
/* BIT Registers */
/* PSW */
sbit CY = 0xD7;
sbit AC = 0xD6;
sbit F0 = 0xD5;
sbit RS1 = 0xD4;
sbit RS0 = 0xD3;
sbit OV = 0xD2;
sbit F1 = 0xD1;
sbit P = 0xD0;
/* TCON */
sbit TF1 = 0x8F;
sbit TR1 = 0x8E;
sbit TF0 = 0x8D;
sbit TR0 = 0x8C;
sbit IE1 = 0x8B;
sbit IT1 = 0x8A;
sbit IE0 = 0x89;
sbit IT0 = 0x88;
/* IEN0 */
sbit EA = 0xAF;
sbit EAD = 0xAE;
sbit ES1 = 0xAD;
sbit ES0 = 0xAC;
sbit ET1 = 0xAB;
sbit EX1 = 0xAA;
sbit ET0 = 0xA9;
sbit EX0 = 0xA8;
/* IEN1 */
sbit ET2 = 0xEF;
sbit ECAN = 0xEE;
sbit ECM1 = 0xED;
sbit ECM0 = 0xEC;
sbit ECT3 = 0xEB;
sbit ECT2 = 0xEA;
sbit ECT1 = 0xE9;
sbit ECT0 = 0xE8;
/* IP0 */
sbit PAD = 0xBE;
sbit PS1 = 0xBD;
sbit PS0 = 0xBC;
sbit PT1 = 0xBB;
sbit PX1 = 0xBA;
sbit PT0 = 0xB9;
sbit PX0 = 0xB8;
/* IP1 */
sbit PT2 = 0xFF;
sbit PCAN = 0xFE;
sbit PCM1 = 0xFD;
sbit PCM0 = 0xFC;
sbit PCT3 = 0xFB;
sbit PCT2 = 0xFA;
sbit PCT1 = 0xF9;
sbit PCT0 = 0xF8;
/* P0 */
sbit AD7 = 0x87;
sbit AD6 = 0x86;
sbit AD5 = 0x85;
sbit AD4 = 0x84;
sbit AD3 = 0x83;
sbit AD2 = 0x82;
sbit AD1 = 0x81;
sbit AD0 = 0x80;
/* P1 */
sbit ADC5 = 0x97;
sbit ADC4 = 0x96;
sbit ADC3 = 0x95;
sbit ADC2 = 0x94;
sbit ADC1 = 0x93;
sbit ADC0 = 0x92;
sbit SDA = 0x97;
sbit SCL = 0x96;
sbit CT3I = 0x95;
sbit CT2I = 0x94;
sbit CT1I = 0x93;
sbit CT0I = 0x92;
sbit TXDC = 0x91;
sbit RXDC = 0x90;
sbit P1_5 = 0x95;
sbit P1_4 = 0x94;
/* P2 */
sbit A15 = 0xA7;
sbit A14 = 0xA6;
sbit A13 = 0xA5;
sbit A12 = 0xA4;
sbit A11 = 0xA3;
sbit A10 = 0xA2;
sbit A9 = 0xA1;
sbit A8 = 0xA0;
/* P3 */
sbit CSMR3 = 0xB5;
sbit CSMR2 = 0xB4;
sbit CSMR1 = 0xB3;
sbit CSMR0 = 0xB2;
sbit RT2 = 0xB1;
sbit T2 = 0xB0;
sbit RD = 0xB7;
sbit WR = 0xB6;
sbit T1 = 0xB5;
sbit T0 = 0xB4;
sbit INT1 = 0xB3;
sbit INT0 = 0xB2;
sbit TXD = 0xB1;
sbit RXD = 0xB0;
/* S0CON */
sbit SM0 = 0x9F;
sbit FE = 0x9F;
sbit SM1 = 0x9E;
sbit SM2 = 0x9D;
sbit REN = 0x9C;
sbit TB8 = 0x9B;
sbit RB8 = 0x9A;
sbit TI = 0x99;
sbit RI = 0x98;
/* TM2IR */
sbit T2OV = 0xCF;
sbit CMI2 = 0xCE;
sbit CMI1 = 0xCD;
sbit CMI0 = 0xCC;
sbit CTI3 = 0xCB;
sbit CTI2 = 0xCA;
sbit CTI1 = 0xC9;
sbit CTI0 = 0xC8;
sbit CAN = 0xCE;
#---------------------------------------结束－－－－－－－－－－－－－－－－－－－－－－
问题就是我在主程序里startadc后，ADC中断也产生了。ET1的中断也处理完了，按说adc_data_ready就应该是1了，但主程序中的判断while(adc_data_ready==0);却总是出不来啊，就一直还在等待。
将adc_data_ready的类型前面加上volatile定义由于adc_data_ready在中断中被修改过，因此应该定义成volatile类型的，如果不这么定义，那么程序有可能在编译时进行优化，从而出现你意想不到的情况。