hello i have written code for for adc in interupt mode using keil for lpc 2148 controller.im getting a problem such that whenever interrupt occurs for first time control goes to isr routine and the returns to main but,for next conversion i,e interrupt invoke control desnt goes to isr.
here is the code
#include<stdio.h> #include<lpc214x.h> #include"uart.h" unsigned int convert,convert1,reg; volatile int flag=0; void adc_isr(void) __irq { convert = (AD0DR3 >> 6)& 0x3ff; convert1=AD0GDR; reg=AD0STAT; //AD0CR &= 0xF8FFFFFF; VICVectAddr0 = 0; flag=1; } adc_intr() { PINSEL1 = (1<<28); AD0CR |= (1<<3); AD0CR |= 0x0000D00; AD0CR |= (1<<16); //burst mode AD0CR |= (1<<21); //AD0CR |= (1<<24); //start conversion now AD0INTEN |= (1<<3); //AD0INTEN |= (1<<8); VICVectCntl0 = 0x32; VICVectAddr0 = (unsigned long)adc_isr; VICIntEnable = (1<<18); } int main() { uart_init(); adc_intr(); while(1) { if(flag==1) { tx_ch('h'); flag=0; } } }
#include<stdio.h> #include<lpc214x.h> #include"uart.h" unsigned int convert,convert1,reg; volatile int flag=0; void adc_isr(void) __irq { convert = (AD0DR3 >> 6)& 0x3ff; convert1=AD0GDR; reg=AD0STAT; VICVectAddr0 = 0; flag=1; } adc_intr() { PINSEL1 = 0x10000000; //select pin AD0.3 AD0CR = 0x00210D08; //select channel 0.3,burst mode,operational mode AD0INTEN = 0x00000008; // will generate interrupt for ADC channel 3 VICVectCntl0 = 0x32; VICVectAddr0 = (unsigned long)adc_isr; VICIntEnable = 0x00040000; //enble AD0 interrupt source } int main() { uart_init(); adc_intr(); while(1) { if(flag==1) { tx_ch('h'); flag=0; } } }