16 bit ADC interface

[harry123]

Hii

I'm interfacing External adc with stm32f429

I want to read 16-bit parallel data from ADC and connected16 lines from ADC to GPIOA

 GPIOA->IDR

how the data is stored in IDR and how to access the input data register continuously for every sample.

Thank you.

[TDK · Accepted solution]

IDR has the digital value on each of the pins PA0, PA1, ..., PA15 in the lower 16 bits. You can set up a timer to trigger a memory-to-memory DMA transfer from GPIOx->IDR to RAM when a signal goes high. You might be driving the ADC with a timer (or clock of some manner), it may be possible to use that same signal to trigger the transfer.

[Tesla DeLorean]

Honesty I wouldn't use GPIOA for this purpose, there are several pins used for the debug connection, and System Loader.

You'll end up creating something that's very difficult to program and debug.

Find a less conflicted GPIO Bank. For triggers, find pins associated with TIMx.CHx on APB2 / DMA2