Spi read is not happening fine,

RE: Spi read is not happening fine,

hassan789 — Tue, 22 Sep 2015 00:47:32 GMT

Had the same issue... Make sure your SPI CLK line has an external pull-DOWN... per the N25Q datasheet

RE: Spi read is not happening fine,

syntroniks — Thu, 31 Oct 2013 16:11:36 GMT

"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.

RE: Spi read is not happening fine,

balaji — Thu, 31 Oct 2013 10:59:09 GMT

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

RE: Spi read is not happening fine,

balaji — Wed, 30 Oct 2013 20:12:21 GMT

Hi Syntroniks,

Here i am uploading datasheet also.

kindly suggest me.

Regards Balaji

n25q_512mb_1ce_3v_65nm.pdf

RE: Spi read is not happening fine,

balaji — Wed, 30 Oct 2013 19:27:33 GMT

HI Syntroniks,

Sorry for my bad variables.

I am using Micron Nor Flash N25Q512.

Kindly some hints.

Regards Balaji

RE: Spi read is not happening fine,

syntroniks — Wed, 30 Oct 2013 18:52:56 GMT

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?