Trying to initiate SPI calls SystemReset

RE: Trying to initiate SPI calls SystemReset

Susheel Nuguru — Wed, 29 Apr 2015 13:51:37 GMT

It did not give any errors to me. This is strange when you say other people has faced this. Anyways I will close this case for now.

RE: Trying to initiate SPI calls SystemReset

Susheel Nuguru — Wed, 29 Apr 2015 07:45:10 GMT

RK is right, I do not see any dependencies between these either unless you are using protected peripheral. I will try your example out.

RE: Trying to initiate SPI calls SystemReset

RK — Wed, 29 Apr 2015 05:44:34 GMT

I don't understand in what way the spi master and ble_init are related. And I read that other thread and it does state that the ble init must be called before setting up the spi master and I still don't understand why.

spi master doesn't need BLE, BLE doesn't use the SPI master, they are unrelated. Quickly looking at the ble init I don't see what it would do to mess up a previously setup spi master nor what's required from ble init to make spi master work.

Anyone care to shed light on WHY these two unrelated things have a dependency on each other?

RE: Trying to initiate SPI calls SystemReset

muhkuhns — Tue, 28 Apr 2015 19:30:37 GMT

Thanks. I wrapped "if (m_transfer_completed)" around it. My Slave only returns FF no matter what I try.. I also tried devzone.nordicsemi.com/.../ the stop condition solution from there :( The Sensor's Slave Select Pin is Active Low... And so does the SPI here work, doesn't it? Well maybe the sensor is corrupt..

RE: Trying to initiate SPI calls SystemReset

Susheel Nuguru — Tue, 28 Apr 2015 19:18:21 GMT

maybe you are reading too early into the RXD registers? for the 'u' thing read this

RE: Trying to initiate SPI calls SystemReset

muhkuhns — Tue, 28 Apr 2015 19:07:38 GMT

To test the SPI without the sensor I just connected MISO with MOSI, that should give me everything on RX what I sent on TX, correct? But when I reset the nRF51-DK it randomly gives me 0 instead of the 1E I sent. And what does the "u" behind "#define TX_RX_BUF_LENGTH 8u" means?

RE: Trying to initiate SPI calls SystemReset

muhkuhns — Tue, 28 Apr 2015 18:19:20 GMT

I set optimisation to the lowest possible level (0) and now the last line before the reset is:

APP_ERROR_CHECK(sd_nvic_ClearPendingIRQ(p_spi_instance->irq_type));

I searched and searched and looked into my code and finally I found this question here: devzone.nordicsemi.com/.../

Looks like it has to be initialised AFTER ble_init. At least the ble_uart example part is working again now ;-)

RE: Trying to initiate SPI calls SystemReset

Susheel Nuguru — Tue, 28 Apr 2015 17:13:30 GMT

The default behavior if APP_ERROR_CHECK has failed is SystemReset. I do not think that Keil is pointing at the right place when this happens, i would suggest to remove your optimizations and then you can step by step debug to find out where it is failing.

p_spi_instance->p_nrf_spi->EVENTS_READY = 0;

The above instruction cannot generate a system reset, in the worst case maybe a bus-error and a hardfault maybe, but never a system reset.