Im trying to read flash memory (N25Q032) identifier using SPI (NRF52) but then eveytime I try to read a register, the output is always zero, I tested with oscilloscope and the output is always driven to low. the CS, CLK and MOSI are behaving well on oscilloscope.
I tested the loop back example and it worked fine, I wired TX to RX and sent buffer on TX and received same data on RX.
what did I miss in my configurations? is it possible that it's because HOLD is driven LOW?? in fact in the PCB, the HOLD pin is driven LOW and cant drive it HIGH
notice that i'm using TWI0 this is why I'm using SPI1
void spi_master_1_event_handler (nrf_drv_spi_evt_t const * p_event)
{
spi_xfer_done = true;
}
#define WREN 0x06
#define RDSR 0x05
#define RDID 0x9E //device identifier : read register
static void spi_master_init(nrf_drv_spi_t const * p_instance, bool lsb)
{
uint32_t err_code;
nrf_drv_spi_config_t config =
{
.irq_priority = APP_IRQ_PRIORITY_LOW,
.orc = 0xCC,
.frequency = NRF_DRV_SPI_FREQ_125K,
.mode = NRF_DRV_SPI_MODE_0,
.bit_order = (lsb ? NRF_DRV_SPI_BIT_ORDER_LSB_FIRST : NRF_DRV_SPI_BIT_ORDER_MSB_FIRST),
};
config.sck_pin = SPI_CLK_MEMORY;
config.mosi_pin = SPI_MOSI_MEMORY;
config.ss_pin = SPI_CS_MEMORY;
config.miso_pin = SPI_MISO_MEMORY;
err_code = nrf_drv_spi_init(&spi, &config, spi_master_1_event_handler);
}
main function
spi_master_init(&spi,false);
for (;;)
{
app_sched_execute();
/* read ientifier register */
m_tx_data_spi[0] = RDID;
spi_xfer_done = false;
err_code = nrf_drv_spi_transfer(&spi, m_tx_data_spi, 1, m_rx_data_spi, 3);
while (!spi_xfer_done) {
__WFE();
}
SEGGER_RTT_printf(0, " data: %d \n", m_rx_data_spi[1] << 8 | m_rx_data_spi[2]);
power_manage();
nrf_delay_ms(900);
}
err_code return NRF_SUCCESS
