I am trying to use SST26VF064B IC in my project (We use nrf-sdk-16 ). we use a driver code that was already tried and tested with the stm32 controller. But when trying to configure with nrf52dk board (nrf52832 IC , pca10040), and read the device ID it returns a different value.
code:
int main(void)
{
gpio_init();
nrf_drv_spi_config_t spi_config = NRF_DRV_SPI_DEFAULT_CONFIG;
spi_config.ss_pin = 0XFF; //NRF_SPIM_PIN_NOT_CONNECTE;
spi_config.miso_pin = SPI_MISO_PIN; //PIN-30
spi_config.mosi_pin = SPI_MOSI_PIN; //PIN-29
spi_config.sck_pin = SPI_SCK_PIN; //PIN-26
APP_ERROR_CHECK(nrf_drv_spi_init(&spi, &spi_config, spi_event_handler, NULL));
//==========================================================================
// Initialize_SST_FLASH();
// Test_Flash_Memory();
// nrf_gpio_pin_set(17);
//==============================================================================
static uint8_t SST_CMD;
/*reset enable */
SST_CMD=SST26_RSTEN;
SST26_ENABLE(); //This function set CE pin low low
SST26_SPI_Wright((uint8_t *)&SST_CMD,1); /*single command*/
SST26_DISABLE(); //This function set CE pin High
/*reset memory*/
SST_CMD=SST26_RST;
SST26_ENABLE();
SST26_SPI_Wright((uint8_t *)&SST_CMD,1);/*single command*/
SST26_DISABLE();
while (1)
{
// Reset rx buffer and transfer done flag
memset(m_rx_buf, 0, m_length);
do{
//SST26_SPI_Wright(0x99,1);
SST26_ENABLE();
nrf_delay_ms(1);
nrf_drv_spi_transfer(&spi, m_tx_buf, 1, NULL, 0);
nrf_drv_spi_transfer(&spi, NULL,0, m_rx_buf, 3);
nrf_delay_ms(1);
SST26_DISABLE();
}while(m_rx_buf[0]!=0xBF);
//SST26_DISABLE();
// printf("UART example started\r\n");
}
}
the device ID is 0xBF but the read value is different.
The scope image when trying to send the command 0x9f is as shown below.
what we recieve is :
the read values while debugging.
P.S - came across a similar thread https://devzone.nordicsemi.com/f/nordic-q-a/52370/spi-interface-problem?ReplySortBy=CreatedDate&ReplySortOrder=Descending but could not resolve the issue.
what bugs me is that the same code and hardware works with stm32 discovery board.
