serial example use UART to communication with PyACI

RE: serial example use UART to communication with PyACI

kingdomlin — Tue, 14 Jan 2020 05:08:00 GMT

Hi Edvin,

After modify HWFC, my program work fine!

Thanks for your support

Eric

RE: serial example use UART to communication with PyACI

Edvin — Wed, 08 Jan 2020 11:57:16 GMT

Hello,

I suspect that this is because the serial example is using HWFC (HardWare Flow Control).

In the serial example, this is set in serial_uart.c, in the serial_uart_init() function, on line 87:

NRF_UART0->CONFIG  = (HWFC ? UART_CONFIG_HWFC_Enabled : UART_CONFIG_HWFC_Disabled) << UART_CONFIG_HWFC_Pos;

HWFC is defined in pca10056.h. Try to change it to false, and see if it works then. Alternatively, try to add the wiring for the flow control (pin P0.05 and P0.07) to the RPi, and also enable flow control on the RPi's UART.

Best regards,

Edvin

RE: serial example use UART to communication with PyACI

kingdomlin — Wed, 08 Jan 2020 08:41:49 GMT

Hi Edvin,

Thanks for your quick response, After test 52840 DK can receive message from my gateway over P0.08

I can see netkey and appkey message in segger debug, so receive message is OK

But P0.06 can't transfer message out, I got nothing from this pin

So PyACI read nothing before timeout

What is the problem and how to fix this issue?

RE: serial example use UART to communication with PyACI

Edvin — Tue, 07 Jan 2020 14:11:48 GMT

Yes. P0.06 and P0.08 on the DK is wired via the programming chip (the Segger Chip on the DK) which translates to USB. But the signal is also running out through the pins on the DK without modifications.