Posted on December 23, 2015 at 04:05Updated: change the title from ADC sampling frequency to CPU clock frequency. I use a timer to trigger ADC sampling on STM32F401, and the interrupt service routine of ADC will toggle a GPIO pin so that I can measu...

Posted on November 29, 2015 at 03:54I have a simple timer interrupt based GPIO toggling code to be tested on STM32F401 discovery board as shown in this link http://codepaste.net/fhmh2v . The problem is this code doesn't toggle the LED/GPIO. I set a ...

Posted on November 16, 2015 at 01:03I am trying to follow Application Note 3998 ''PDM audio software decoding on STM32 microcontrollers'' to convert the recorded PDM signal to PCM data. I copy the ''pdm_filter.h'' and ''libPDMFilter_Keil.lib'' files...

Posted on October 08, 2015 at 04:18I see someone had a similar problem on the forum before but it hasn't been addressed yet. I am trying to get audio data from the on-board microphone on STM32F4 discovery board, and do some post-processing. As the f...

Posted on October 06, 2015 at 07:44In my application, I have a timer generating periodic interrupts. In its ISR a certain number of PWM cycles needs to be generated on a GPIO pin. I first use another timer to time the duration, but it is not very de...