Spi read is not happening fine,

[balaji]

Hi

We have custom nrf51822 board.

in that we have nor flash which is spi compatible.

so in order to read device id i used spi_master sample source code.

i am able to write data in to Nor flash.

i check with debugging also.

it is giving ack for every byte write.

but i a not able to read data from nor.

i am trying to read device id of nor.

Here is my code

int main(void) { uint32_t *spi_base_address; NRF_GPIO->PIN_CNF[30]=0; NRF_GPIO->OUTCLR=(1<<30); bool lsb_first=0; uint16_t transfer_size1=1; uint8_t data=0x06;//SPI_FLASH_INS_WREN; uint8_t recvbuf[3]={0x00}; uint8_t *tx_data1=&data; uint16_t transfer_size=3; uint8_t SPI_FLASH_INS_RDID[5]={0x9F,0x00,0x00,0x00,0x00}; uint8_t *tx_data=&SPI_FLASH_INS_RDID[0]; uint8_t *rx_data=&recvbuf[0];

spi_base_address=spi_master_init(SPI0,SPI_MODE0,lsb_first);
//spi_master_tx_rx(spi_base_address,transfer_size1,tx_data1,rx_data);

spi_master_tx_rx(spi_base_address,transfer_size,tx_data,rx_data);
      while(true)
      {
    }

}

i configured currect gpio pin spi_master_config.h

Kindly suggest me.if anyone have simple spi code for eeprom or some other hardware kindly share with me

Regards Balaji

[syntroniks]

static void halAfe_ConfigSPI(void)
{
  /* UART/SPI Peripheral configuration */
	spi_handle = spi_master_init(SPI0, SPI_MODE0, false);
	if (spi_handle == 0)
		; // uh-oh
}
void HalAfe_HW_Init(void)
{
  /* Initialize AFE IO lines */
  halAfe_ConfigIO();

  /* Initialize SPI */
  halAfe_ConfigSPI();
  HalAfe_HW_Defaults();
}
void HalAfe_HW_EnterReadMode()
{
	uint32_t txdat = 1;
	uint8_t rxdat[] = {0, 0, 0, 1};
	txdat = swap_uint32(txdat);
	if (spi_handle != 0)
		spi_master_tx_rx(spi_handle, 4, (uint8_t*)&txdat, rxdat);
}

spi_master_cfg.h

#define SPI_PSELSCK0              8   
#define SPI_PSELMOSI0             10   
#define SPI_PSELMISO0             9   
#define SPI_PSELSS0               11  

You should buy a logic analyzer if you don't have one. Your variables and names are very confusing.

Post your part number as well. How should I know what flash you have?

[balaji]

HI Syntroniks,

Sorry for my bad variables.

I am using Micron Nor Flash N25Q512.

Kindly some hints.

Regards Balaji

[balaji]

Hi Syntroniks,

Here i am uploading datasheet also.

kindly suggest me.

Regards Balaji

n25q_512mb_1ce_3v_65nm.pdf

[balaji]

Hi

Here Is my configuration,

for Nor flash.

i set DQ0 as MOSI

i set DQ1 as MISO.

i kept clock frequency as 1 Mbps.

i set mode MODE0 means Sample data at rising edge of clock and shift serial data at falling edge

i make wp pin,hold pin and chip select pin as pull up.

then i am able to send data over MOSI which is i saw in CRO.

but there is no data in MISO.

I am trying to read device id as 0X20BA20. by sending read id command 0x9F.

Kndly suggest me

Regards Balaji

n25q_512mb_1ce_3v_65nm.pdf

[syntroniks]

"chip select pin as pull up." Please verify that the microcontroller is pulling this line low when you are executing spi_master_tx_rx. MODE0 is pretty common and I don't see any issues with MOSI/MISO being swapped.