How to set nRF52832 to do parallel input and output?

[Francis Feng]

Nrf52832 I/O is from P0.00~P0.31, I want to use one of the I/O to do parallel input and output, how to set? For example, with P0.02~P0.17, these 16 I/O ports make a 16-bit input parallel port.

Another experiment was done today, if Bluetooth sends data (calling ble_nus_data_send function) timer240us into an interrupt is not accurate. If only the Bluetooth connection is successful and no data is sent, 40us is accurate. This is also a problem with other timers.Could you please help me find out what the reason is?

Please help resolve these problems, thanks!

[Kazi Afroza Sultana]

Hello,

''Nrf52832 I/O is from P0.00~P0.31, I want to use one of the I/O to do parallel input and output, how to set? For example, with P0.02~P0.17, these 16 I/O ports make a 16-bit input parallel port.''

Could you please try to explain a bit detail what you're trying to achieve? For example: interface in more detail; is there a clock pin somewhere, and is that controlled from the nRF52 or somewhere else?

You could configure 16 pins as input pins and receive 16 bits simultaneously, however the problem is, you have to implement different protocols with minimal or no hardware changes since we do not have any dedicated peripheral for this. 

The NRF_GPIO->IN register allows you to read all 32 bits in parallel, and if you only care about a subset of the pins you can mask them out. 

We have 8 GPIOTE channels on nRF52832. So, you can e.g. change state of these GPIO pins at the same time using PPI.

Thanks.

BR

Kazi

[Francis Feng]

Thanks! But after I tried it, I found that It doesn't seem to be in the sdk package:

#include <zephyr/drivers/clock_control.h>
#include <zephyr/drivers/clock_control/nrf_clock_control.h>

This is the XTAL clock, right? The previous program was already this clock.

[wmuees]

The LF clock is 32KHz. You want the HF clock, I assume.