I have a small project with kit Friendly ARM mini2440. But I don't know how to program and use pwm and adc. I have to use ADC to take the feed back from angel sensor and control a DC servo via PWM. Anyone can help me? Please How to assess ADC, just one channel is enough and another one for PWM Please help me Thanks!
Sounds like a big project. Which kernel, root filesystem and toolchain do you want to use? I'd suggest reading through the QuickStart guide found at http://www.pengutronix.de/oselas/bsp/pengutronix/mini2440_bsp_en.html for the ADC. Haven't used the PWM.
If you will deside to use startos, I'll provide you with the PWM_out, ADC is already there.
PWM should be no problem. Feasibility depends on adc sampling rate and how fast you want to react to changes in value. A kernel module to handle adc interrupts and update the pwm buffers accordingly should easily manage that unless the sampling rate and preemption requirements are very high. Will also depend on your pwm control logic. If it takes up few instructions might be better to do that inside the irq handler instead of tasklets or work queues (I said "MIGHT") again it all depends on sample rate, how fast you want to react to changes, how many processes would be running and how processor intensive they are.