nrf52 recieves wrong SPI memory flash ID

[JosePastor23]

I'm working with the PCA10040, the SDK V11.0.0. and the winbond memory flash W25Q80BV.

For the SPI connection I'm using the the SPI2 because TWI0 and TWI1 are being used by other sensors.

I have a problem when I try to get the memory flash ID information (through order 0x90): It should send (0x00,0x00,0x00,0x00,0xEF,0x13) but instead it sends random values in bytes 5 and 6. I've checked the pin connection of SCK,MISO,MOSI and SS and it's correct. Also I've checked that /HOLD pin is high. I've tried with the 0 and 3 spi modes (as the winbond datasheet indicates) and also different frequencies values, but still I couldn't get the proper value.

Here I attach the code delevoped based on the spi example:

#if defined(BOARD_PCA10036) || defined(BOARD_PCA10040)
#define SPI_CS_PIN   29 /**< SPI CS Pin.*/
#elif defined(BOARD_PCA10028)
#define SPI_CS_PIN   4  /**< SPI CS Pin.*/
#else
#error "Example is not supported on that board."
#endif

#define SPI_INSTANCE  2 /**< SPI instance index. */
static const nrf_drv_spi_t spi = NRF_DRV_SPI_INSTANCE(SPI_INSTANCE);  /**< SPI instance. */
static volatile bool spi_xfer_done;  /**< Flag used to indicate that SPI instance completed the transfer. */

static uint8_t       m_tx_buf= 0x90;           /**< TX buffer. */
static uint8_t       m_rx_buf[6];    /**< RX buffer. */


/**
 * @brief SPI user event handler.
 * @param event
 */
void spi_event_handler(nrf_drv_spi_evt_t const * p_event)
{
    spi_xfer_done = true;
    NRF_LOG_PRINTF(" Transfer completed.\r\n");
}

int main(void)
{
    LEDS_CONFIGURE(BSP_LED_0_MASK);
    LEDS_OFF(BSP_LED_0_MASK);

    APP_ERROR_CHECK(NRF_LOG_INIT());
    NRF_LOG_PRINTF("SPI example\r\n");

    nrf_drv_spi_config_t spi_config = NRF_DRV_SPI_DEFAULT_CONFIG(SPI_INSTANCE);
		spi_config.mode= NRF_DRV_SPI_MODE_0;
    spi_config.ss_pin = SPI_CS_PIN;
		spi_config.frequency= NRF_DRV_SPI_FREQ_1M;
		spi_config.bit_order=NRF_DRV_SPI_BIT_ORDER_MSB_FIRST ;
	
	
    APP_ERROR_CHECK(nrf_drv_spi_init(&spi, &spi_config, spi_event_handler));

    while(1)
    {
        // Reset rx buffer and transfer done flag
        memset(m_rx_buf, 0, sizeof(m_rx_buf));
        spi_xfer_done   = false;

        APP_ERROR_CHECK(nrf_drv_spi_transfer(&spi, &m_tx_buf,sizeof(m_tx_buf) , m_rx_buf, sizeof(m_rx_buf)));

        while(spi_xfer_done == false)
        {
            __SEV();
            __WFE();
            __WFE();
        }
				
						for(int i=0;i<6;i++){
							NRF_LOG_PRINTF(" Received: %04x\r\n",m_rx_buf[i]);
						}    

    }
}

Here I attach the RTT information send and the signals values obtained by a logic analyzer.

I've tested the memory chip with an arduino application and it's working fine so the problem must be in some configuration parameter of the nordic side.

Somebody has experience a similar issue or have any idea about what I'm doing wrong?

[Alex]

I think you need to send 0x90, 0x00, 0x00, 0x00 and then receive ID

The instruction is initiated by driving the /CS pin low and shifting the instruction code “90h”
followed by a 24-bit address (A23-A0) of 000000h. After which, the Manufacturer ID for Winbond (EFh)
and the Device ID are shifted out on the falling edge of CLK with most significant bit (MSB) first as shown
in figure 29. The Device ID values for the W25Q80BV is listed in Manufacturer and Device Identification
table. If the 24-bit address is initially set to 000001h the Device ID will be read first and then followed by
the Manufacturer ID. The Manufacturer and Device IDs can be read continuously, alternating from one to
the other. The instruction is completed by driving /CS high.

So sending buffer 4 bytes and receiving buffer 2 bytes(actually receiving buffer 6 in total).

[JosePastor23]

I've tried sending 4 bytes and receiving 6 bytes as you commented, no change in the data receive.

[JosePastor23]

After changing the memory power supply from the PCA10040 to a external supply I have estable data but still I'm not able to obtain the proper six bytes (0x00,0x00,0x00,0x00,0xEF,0x13) for now I get (0x00,0x00,0x00,0x00,0xDC,0x1E).

Here I attach what I get from the LA:

[Alex]

Try to change spi mode now

[JosePastor23]

I've tried with modes 0 and 3 and with different frequencies but the values read are still the same.