SPI transfer issue at high data rates.

[Teja_Bezawada]

Hi,

I'm working on the ble_att_mtu_throughput example code on nrf52840(peripheral) & nrf52832(central) . SPI data is transmitting from TI(slave) board to nrf52840(master) by monitoring two master and salve gpio pins. I have seen the data in a debug mode by putting a breakpoint in the spi event handler. When I put it for a continuous run junk data is coming. 

SPI configs in nrf52840:

.frequency = NRF_DRV_SPI_FREQ_4M, \
.mode = NRF_DRV_SPI_MODE_0, \
.bit_order = NRF_DRV_SPI_BIT_ORDER_MSB_FIRST,

 

The same junk data is transmitting to nrf52832(central) board. 

If I maintain a delay of 25ms to 30ms then I'm getting valid data in continuous transmission. 

Why should I need to maintain delay in TI code?.

Thanks,

Regards

Saiteja.

[Stian Røed Hafskjold]

So the data from the TI board to the nRF52 is corrupted when it's transmitting too fast? Then you need to look into the TI code and see why it can't transmit at the preferred speed. I can't help you with that part, sorry.