Posted on May 17, 2011 at 09:49Hi folks,
I just don't get it: I configured the ADC according to the reference sheet. The ADC does start the conversion and produces an ECVI. But there are no data (voltage was about 2,2V). Here is my code (relevant parts):
/*********** CODE ***********/
init_peripherals.c:
(...)
void init_ADC(void){
// Clock for ADC
SCU->PRR1 |= 0x00040800;
SCU->PCGR1 |= 0x00040800;
// Configure channels
ADC->CCR = 0x000C;
// RESET
// Set GPIOANA for 4.1
SCU->GPIOANA = 0x0002;
// configure options
ADC->CR |= 0x0440; // ECVI enable, single channel mode on ch1, one shot mode
// Set POR
ADC->CR |= 0x0002;
// wait 1ms
wait(1000);
// STANDBY
// clear STB
ADC->CR &= 0xFFF7;
// wait 15 us
wait(15);
// IDLE
// conversion needs to be started by setting STR
}
void init_VIC(void){
/* VICx_INTSR, set corresponding bit [0: IRQ; 1: FIQ]
* VICx_VCiR, enable corresponding register with 0x20 and pass IRQ# to 0:4
* VICx_VAiR, pass address of ISR
* VICx_INTER, set corresponding bit [0: dis; 1: ena]
*/
// Clock for VIC
SCU->PRR0 |= 0x0020;
SCU->PCGRO |= 0x0020;
// Interrupt for ADC
VIC0->VCiR[15] = 0x20;
VIC0->VCiR[15] |= 15;
VIC0->VAiR[15] = (unsigned int)ADC_IRQHandler;
VIC0->INTER |= 0x8000;
}
main.c:
(...)
// measure U_LDR_offen
ADC->CR |= 0x0001;
wait(500);
(...)
/*********** END OF CODE ***********/
Do I need to set GPIO4.1 to Alternate Input (internal peripheral connected)? This is what they do in the Blinky-example. Haven't tried this yet.
HARDWARE:
Keil MCBSTR-9 (STR912FW44)
Keil uvision
Cheers
Nik
