nRF52840 read/write issue over SPI connected with Flash

[Hardik Prajapati]

Hello,

My nRF52840 board is connected with SPI flash over SPI. I have configured the nordic as master and my SPI flash is slave as mentioned below:

.sck_pin = SPI_SS_PIN, 
.mosi_pin = SPI_MOSI_PIN, 
.miso_pin = SPI_MISO_PIN, 
.ss_pin = SPI_SCK_PIN, 
.irq_priority = SPI_DEFAULT_CONFIG_IRQ_PRIORITY, 
.orc = 0xFF, 
.frequency = NRF_DRV_SPI_FREQ_4M, 
.mode = NRF_DRV_SPI_MODE_0, 
.bit_order = NRF_DRV_SPI_BIT_ORDER_MSB_FIRST,

Using the internal API "nrf_drv_spi_transfer", I am able to read the data but I am not able to write data on SPI flash. I am writing the first WREN(0x06) command before writing anything but it seems it doesn't work. However, If I take a look at the logic analyzer, it shows a bit shifted to the right side for every read-write operation, but it reads it right.

Can you please point me out where exactly I am missing something?

Any help would be greatly appreciated.

Thanks,

Hardik

[Hardik Prajapati]

Solved !!!!

The problem was in the LED initialization(bsp_board_init(BSP_INIT_LEDS)), the GPIOs for LEDs are conflicting MOSI and clock pins of the SPI configuration.

By disabling this line or by disabling the clock GPIO from LED initialization solved this problem.