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

[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.