topic Re: How can I write data to external Flash using FLEXSPI APIs? in i.MX RT Crossover MCUs

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

yongjin2712_cho — Wed, 08 Aug 2018 07:44:22 GMT

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

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

igorpadykov — Thu, 09 Aug 2018 09:55:42 GMT

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

yongjin2712_cho — Fri, 10 Aug 2018 00:43:12 GMT

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?

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

igorpadykov — Fri, 10 Aug 2018 04:56:31 GMT

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

with nxp EVK reference board

Welcome | MCUXpresso SDK Builder

Best regards
igor

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

yongjin2712_cho — Tue, 14 Aug 2018 00:47:36 GMT

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);

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

igorpadykov — Tue, 14 Aug 2018 06:18:57 GMT

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.