Hello, I'm Juan Manuel and I'm trying to use the FIQ in the ADUC7026, but I've got a problem using it. First, I configured the device (external IRQ0 on the evaluation board AD), then enabled the IRQ. The main program works ok, until I press the button, I mean I do an IRQ0, so ADUC7026 execute FIQ_Handler()__fiq, and then stays there forever, it doesn't go back to the main program. What Am I doing wrong? Here's the code:
//TIMER 0 T0LD=209; T0CON=0xC0; //ADC CONFIGURATION ADCCON = 0x20; // Power-on the ADC Delay(50000);// Wait Minimum time to Start Conversion ADCCP = 0x04; // conversion on ADC4 ADCCN= 0x03; // conversion on ADC3 DIFFERENTIAL MODE ADCCON= 0x02AA; // Timer 1 - DIFFRENTIAL MODE REFCON = 0x01; FIQEN = XIRQ0_BIT; ... void FIQ_Handler() __fiq { seleccion++; //Just Increment this global variable if(seleccion==6) seleccion=0; return ; }
I don't think so... I did it as appears in the CD from Analog Devices. Look at this example:
void IRQ_Handler(void) __irq;// IRQ Funtion Prototype .... void IRQ_Handler() __irq { GP4DAT ^= 0x00040000; // Complement P4.2 ADCCP ^= 1; // change channel senddata (ADCDAT >> 16); return ; }
It's strange, I don't understand why it doesn't work to me
if you are using the VIC (I suppose the chip has a vector interrupt controller): -You have to initialize it. or if you don't use the VIC: -You need to write the Vector Address.