Spi interface problem

RE: Spi interface problem

Simonr — Mon, 23 Sep 2019 07:51:07 GMT

Did you implement the bug fixes hmolesworth suggested? Have you remembered to set the correct frequency, etc. according to the MX25L64? Do you have a logic analyzer available so you can check that you're sending the correct info to the external memory?

Best regards,

Simon

RE: Spi interface problem

SAIF — Fri, 20 Sep 2019 07:45:08 GMT

Hi,i have tried what u said ,but still i got the same problem.

i have commented

FLASH_IO_CS_High();

FLASH_IO_CS_low();

and checked it

i will send the log statements

Spi...Init....

SPI example started.  = 0 

Byte = 159 and SPI_WRITE_READ  = 0 == 194 === 0 ==== 0 err_code = 0

Byte = 0 and SPI_WRITE_READ  = 0 == 0 === 0 ==== 0 err_code = 0

Byte = 0 and SPI_WRITE_READ  = 0 == 0 === 0 ==== 0 err_code = 0

Byte = 0 and SPI_WRITE_READ  = 0 == 0 === 0 ==== 0 err_code = 0
Temp = 0 Temp0 = 0 Temp1 =0 Temp2 = 0
Id = 0 

byte write done beginning 

Byte = 6 and SPI_WRITE_READ  = 0 == 0 === 3 ==== 0 err_code = 0

Byte = 2 and SPI_WRITE_READ  = 0 == 0 === 3 ==== 0 err_code = 0

Byte = 0 and SPI_WRITE_READ  = 0 == 0 === 3 ==== 0 err_code = 0

Byte = 0 and SPI_WRITE_READ  = 0 == 0 === 3 ==== 0 err_code = 0

Byte = 1 and SPI_WRITE_READ  = 0 == 0 === 3 ==== 0 err_code = 0

Byte = 5 and SPI_WRITE_READ  = 0 == 0 === 3 ==== 0 err_code = 0

byte write done end

Byte = 3 and SPI_WRITE_READ  = 0 == 0 === 0 ==== 0 err_code = 0

Byte = 0 and SPI_WRITE_READ  = 0 == 0 === 0 ==== 0 err_code = 0

Byte = 0 and SPI_WRITE_READ  = 0 == 0 === 0 ==== 0 err_code = 0

Byte = 1 and SPI_WRITE_READ  = 0 == 0 === 0 ==== 0 err_code = 0

 0 4 0 32
Mx25L64_BYTE_Read = 0 

/*here i am getting some different values in the receiving  buffer while reading*/

RE: Spi interface problem

hmolesworth — Thu, 19 Sep 2019 22:09:20 GMT

Manually controlling the CS pin requires that you change .ss_pin to stop the Nordic library code also controlling the pin from this

spi_config.ss_pin   = SPI_SS_PIN;

to this:

spi_config.ss_pin = NRF_DRV_SPI_PIN_NOT_USED;

There is also a bug here, as if more than 1 byte is transmitted a pointer to an array of bytes must be used, not the address of a single byte

err_code = nrf_drv_spi_transfer(&spi, &Byte, 2, pData, 2);
// if only 1 byte change to this:
err_code = nrf_drv_spi_transfer(&spi, &Byte, 1, pData, 2);

Same problem here and in other places, spi_transfer requires a pointer to an array or the address of a byte if only sending 1 byte

uint8_t* FLASH_IO_WriteReadByte(uint8_t data,uint8_t len)
{
    ret_code_t err_code;
    err_code = nrf_drv_spi_transfer(&spi, &data, len, Rxbuff, len);
    APP_ERROR_CHECK(err_code);
	  return Rxbuff;
}

change to something like this:

uint8_t* FLASH_IO_WriteReadByte(uint8_t * p_data,uint8_t len)
{
    ret_code_t err_code;
    err_code = nrf_drv_spi_transfer(&spi, p_data, len, Rxbuff, len);
    APP_ERROR_CHECK(err_code);
	  return Rxbuff;
}

That's all I can help with, too busy fixing my own projects ..