nrf51822 spi slave problems

RE: nrf51822 spi slave problems

Brajesh — Tue, 27 Jan 2015 10:29:51 GMT

Hi Dear,

Did you get your problem solved ? I m trying similar sort of thing. Only difference is my SPI master is MSP430 not ST. And i still dont get why MISO pin is configured as input in nRF. I'm using spi_slave_example application.

Brajesh

RE: nrf51822 spi slave problems

anonyme16 — Thu, 19 Jun 2014 13:16:43 GMT

Thank's for explanation, it's more clear.

No, I never have an interrupt in the SPI_TWI_IRQHandler or spi_event_handler. It's very strange and I have no more idea to try. I test the communication between my cortex M4 and the nrf with nrf has master, it's work perfectly. But in the other side (nrf slave), nothing happend. I don't receive 0xAA or 0x55. I checke the timing specified in the datasheet, i work with a spi clock at 1.3 MHz and others timing seems ok. Any idea for solving my problem?

RE: nrf51822 spi slave problems

Håkon Alseth — Thu, 19 Jun 2014 13:06:09 GMT

When any peripheral that needs GPIOs to function properly is started, this specific peripheral overrides the GPIO-configuration to suit its needs. In this case MISO becomes an output.

For each completed transaction, the semaphore is released. You'll then need to call the spi_slave_buffers_set again to acquire it again.

There should not be a special sequence, as long as everything is configured correctly (SPI mode/bit order) and it's physically connected correctly.

Do you get any interrupts at all? Do you receive 0xAA/0x55 data on the ST-side?