How can I write data to external Flash using FLEXSPI APIs?

[yongjin2712_cho]

Hello,

I'am trying to write data to external Flash.

First, the code below works well to write code to flash

void NVDATA_Write() {

memset(wr_buf, 0xFF, 512*sizeof(uint8_t));

FLASH_page_program(FLEXSPI, (uint32_t)0x100000, (void *)wr_buf, 512));

}

However, in case of getting parameter of function, I does not work well.

void NVDATA_Write(uint8_t* data) {

   memset(wr_buf, 0xFF, 512*sizeof(uint8_t));

   memset(wr_buf, data, 16*sizeof(uint8_t));

   FLASH_page_program(FLEXSPI, (uint32_t)0x100000, (void *)wr_buf, 512));

}

Please let me know why it doesn't work well

[igorpadykov]

Hi YongJin

probably there is confusion as function void NVDATA_Write(uint8_t* data) implies passing

pointer to data, so if you are expecting to pass data it should be as (uint8_t data) .

You can inspect data value in more details using debugging.

Best regards
igor
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[yongjin2712_cho]

Thank you for your reply

Hmmmm,

in first case, I sets wr_buf as {0x5A, 0x5A, 0xFF, 0xFF,.... }

uint8_t wr_buf[512];

void NVDATA_Write() {

memset(wr_buf, 0xFF, 512*sizeof(uint8_t));

memset(wr_buf, 0x5A, 2*sizeof(uint8_t))

flexspi_nor_flash_page_program(FLEXSPI, (uint32_t)0x100000, (void *)wr_buf, 512));

FLEXSPI_SoftwareReset(EXAMPLE_FLEXSPI);

}

and after writing it to flash I saw that it had a value of 0xFFFF5A5A when the address 0x60100000 was dumped

It does work well.

However, in second case, I make a code as below

uint8_t wr_buf[512];

void NVDATA_Write(uint8_t* data) {

memset(wr_buf, 0xFF, 512*sizeof(uint8_t));

memset(wr_buf, data, 2*sizeof(uint8_t))

flexspi_nor_flash_page_program(FLEXSPI, (uint32_t)0x100000, (void *)wr_buf, 512));

FLEXSPI_SoftwareReset(EXAMPLE_FLEXSPI);

}

and I call NVDATA_Write() function as below

uint8_t buffer[2] = {0x5A, 0x5A}

NVDATA_Write(buffer);

And with mcuxpresso debugger, I saw that wr_buf was set to {0x5A, 0x5A, 0xFF, 0xFF,.... }

But after writing it to flash I saw that it had a value of 0xFFFF5E7A when the address 0x60100000 was dumped

It doesn't work well

I don't know what difference is.

Could you tell me why it is different?

[igorpadykov]

what board used in the case, could you try latest MCUXpresso SDK

with nxp EVK reference board

Welcome | MCUXpresso SDK Builder

Best regards
igor

[yongjin2712_cho]

I used RT1050 EVKB board with hyperflash and latest SDK

And I used external flash as below. I'm trying to write data into EXT_FLASH_NV section.

In linkerscript

MEMORY
{
  /* Define each memory region */
  EXT_FLASH (rx) : ORIGIN = 0x60000000, LENGTH = 0x100000 /* 1M bytes (alias Flash) */ 
  EXT_FLASH_NV (rw) : ORIGIN = 0x60100000, LENGTH = 0x80000 /* 512K bytes (alias Flash2) */ 
  EX_FLASH_RES (r) : ORIGIN = 0x60180000, LENGTH = 0x3e80000 /* 64000K bytes (alias Flash3) */ 

In board.c

    MPU->RBAR = ARM_MPU_RBAR(region_idx++, 0x60000000U);
    MPU->RASR = ARM_MPU_RASR(0, ARM_MPU_AP_FULL, 1, 0, 1, 1, 0, ARM_MPU_REGION_SIZE_1MB);

    MPU->RBAR = ARM_MPU_RBAR(region_idx++, 0x60100000U);
    MPU->RASR = ARM_MPU_RASR(1, ARM_MPU_AP_FULL, 0, 0, 1, 1, 0, ARM_MPU_REGION_SIZE_512KB);

    MPU->RBAR = ARM_MPU_RBAR(region_idx++, 0x60180000U);
    MPU->RASR = ARM_MPU_RASR(1, ARM_MPU_AP_FULL, 1, 1, 0, 0, 0, ARM_MPU_REGION_SIZE_64MB);

[igorpadykov]

please check hyperflash timings with logic analyzer or oscilloscope both

good and not good cases and check if issue is caused by flash wrong timings or

MCUXpresso sends wrong data.