Hi, I'm developing a measurement system with mini2440 and I'm using ADC channel 0. I want to increase sampling rate. I've changed adcdev.prescale=0xFF value in kernel /linux-2.6.32.2/drivers/char/mini2440_adc.c and recompile it, but nothing changed. My sampling code using "/dev/adc" Does anybody know how can I increase the sampling rate? Thanks...
Hi You can increase the speed of sampling by change the value of ADCDLY register. but your touch screen not work. and we have problem with Internal Sample and hold. Best Regards
Hi Farzad, Thank you for answer. I tried a lot of things. I tried to increase adc sampling rate but I could not success. I tried to running an external serial adc via gpio but gpio in user level too slow. I read about spi adc works in this forum but I understood that speed problem still present. I solved my problem with secondary microcontroller card. This little card is working as a data acquisition card and sending data to the mini2440 via ttl level uart. Best regards...