About hardware flow control

[Kaito]

Hi! Now I am going to control the hardware flow and control the UART. For that purpose, we send an RTS signal from the external MPU and the nRF 52832 that received it sends out an RTS signal to the external MPU. Therefore, although it is possible to send the RTS signal from the external MPU. but,it is not able to send the RTS signal from the nRF and receive it as the CTS by the external MPU. Why is that? now i am using the ble_app_uart/pca10040/s132/arm5_no_packs ofsdk14.0.0 and nRF52832.

thank you in advanced!!

[Matt]

Don't understand your question here. Have you enabled uart flow control in your firmware application in the MPU side? Have you enabled uart flow control in the nRF52 application when you call the uart_ini() code in the nRF52832 side?

[Kaito]

thank you for your reply! i modified the uart_init()! but i could not do the hardware flow control. the picture is shown in this below. gyazo.com/973c7ea19887c208cf37ad6833d00d20 gyazo.com/e60dbc0ee0aeaefc279ea24535d21a30

In the second picture, the purple waveform is the RTS signal and the green is the CTS signal. The RTS signal is output from the external MPU, but the green CTS signal can not be received by the external MPU. I do not understand this cause. regards!

[MartinBL]

Have you connected the CTS and RTS pins correctly?

[Kaito]

Yes,i have connected the CTS and RTS pin. but the rts signal couldn't be output from nRF52832 to external MPU. now i have used the DK of nRF52832. i researched the HWFC,i understood to need the DTR signal. Does it need to send DTR signal from PC to DK of nRF52832? how to send DTR signal to DK of nRF52832? Also,Is it possible to use CTS and RTS pin without using DTR signal? thank you in advanced!

[Matt]

Can you share your test code with us here?