pwm and ppm in stm32f407 discovery board

[mohamad_armoon]

Posted on April 23, 2014 at 07:04

hi guys

i could produce pwm in stm32f407 but i don't know how to read pwm with this.if i have 9 channel pwm i think i takes 9 pin from servo and if i can send this 9 pwm through 1 ppm(

Pulse Position Modulation

) channel it would be more optimize and takes less space .now my questions is how can i read 9 pwm channel and how can i read 1 ppm with stm32f407??any idea would be great #input #pwm #discovery #stm32f4

[Tesla DeLorean]

Posted on April 23, 2014 at 16:12

You'd need one timer per channel, they only have one counting element, and the period/duty latches use CH1/CH2

Not familiar with PPM, but you should be able to latch pin transitions with a time-stamp, and use either interrupts, or DMA to accumulate/measure the intervals.