Issue of using SPI in bootloader

RE: Issue of using SPI in bootloader

Liu Tengfei — Fri, 03 Aug 2018 02:48:18 GMT

We spent a lot of time to probe SPI lines! Finally we fixed the problem by adding this line at the beginning of main function.

NRF_POWER->TASKS_CONSTLAT = 1;

RE: Issue of using SPI in bootloader

Susheel Nuguru — Fri, 08 Jun 2018 09:48:17 GMT

I am guessing that something is happening on the SPI lines during the powerup sequence. Probing these lines using some analyzer should give you a lot of information. Also loosing 11 bits is very strange, SPI operates in bytes.

RE: Issue of using SPI in bootloader

Liu Tengfei — Fri, 08 Jun 2018 02:18:07 GMT

Could someone help on this? Is there any difference between soft-reset and power cycle on SPI and GPIO configurations? (probably due to MBR or other interrupt?)