The example flexnvm code is not working on our processor : MK50DX256CLL10

shridharrao — Thu, 06 Aug 2015 12:44:10 GMT

Actually the example section in MQX 4.2 doesn't have support for this processor but we modified the code accordingly to our processor - when we run the code, the very first fopen("flashx:flexram0", NULL);. fails. And we are unable to do anything after that. So we tried writing our own code.

The data written to FlexNVM is disappearing after a power reset if we try our own code (just a simple sequence of commands to partition the FlexNVM and enable EEE and use direct read/writes to FlexRAM memory). I have tried opening Service requests but I only got answers that work on barebones but don't work with MQX.

Our need is to use FlexRAM to back some critical data inside E-Flash (FlexNVM) with MQX on MK50DX256CLL10. I suspect that MQX is erasing the Flash during boot. Because with our code, we are able to read and write to FlexNVM portion (through FlexRAM/EEE) when the power is retained. But after the processor boots after a power cycle, the data written to FlexNVM is lost. Our code is pasted below:

#include "derivative.h" /* include peripheral declarations */

#define LONGWORD_COUNTER_ADDR 0x14000000

#define WORD_COUNTER_ADDR 0x14000004

#define BYTE_COUNTER_ADDR 0x14000006

#define REG_READ(address) ((unsigned char)(*(volatile unsigned char*)(address)))

#define WRITE8(address,value) (*(volatile unsigned char*)(address) = (value))

#define READ8(address) ((unsigned char)(*(volatile unsigned char*)(address)))

int partition_flash(int eeprom_size, int dflash_size)

{

if ((SIM_FCFG1 & SIM_FCFG1_DEPART(0xF)) != 0x00000F00)

{

return 0;

}

/* clear RDCOLERR & ACCERR & FPVIOL flag in flash status register */

FTFL_FSTAT = (0x40|0x20|0x10);

/* Write the FCCOB registers */

FTFL_FCCOB0 = FTFL_FCCOB0_CCOBn(0x80);

FTFL_FCCOB1 = 0x00;

FTFL_FCCOB2 = 0x00;

FTFL_FCCOB3 = 0x00;

FTFL_FCCOB4 = eeprom_size;

FTFL_FCCOB5 = dflash_size;

FTFL_FSTAT = FTFL_FSTAT_CCIF_MASK;

while(!(FTFL_FSTAT & FTFL_FSTAT_CCIF_MASK));

return 1;

}

void EEEWrite(unsigned long destination,unsigned long size,unsigned long source)

{

if((FTFL_FCNFG & 0x01)==0x01)

{

while(size > 0)

{

while(0 == (FTFL_FCNFG & 0x01))

{

//delay

}

WRITE8(destination,READ8(source));

if(REG_READ(FTFL_FSTAT & 0x10))

{

}

destination += 1;

size -= 1;

source += 1;

}

void EEE_read_data(char *buffer, int length,int offset) {

uint32_t receive_byte = 0;

for (receive_byte = 0; receive_byte < length; receive_byte++) {

buffer[receive_byte] = *((uint8_t *)(offset + receive_byte));

}

uint32_t temp_val_long_word = 0;

uint16_t temp_val_word = 0;

uint8_t temp_val_byte = 0;

int main(void)

{

unsigned long source;

unsigned long address;

unsigned long size;

unsigned char buffer[0x20] = {0x33,0x44,0x55,0x66,0x77,0x88};

unsigned char dataread[0x20] = {0};

//address = 0x14000000;

//EEE_read_data(dataread,6,address);

SCB_SHCSR|=SCB_SHCSR_BUSFAULTENA_MASK|SCB_SHCSR_MEMFAULTENA_MASK|SCB_SHCSR_USGFAULTENA_MASK;

if (partition_flash( 0x38, 0x5))

{

*((uint32_t *)(LONGWORD_COUNTER_ADDR)) = 0x0;

while(!(FTFL_FCNFG & FTFL_FCNFG_EEERDY_MASK));

*((uint16_t *)(WORD_COUNTER_ADDR)) = 0x0;

while(!(FTFL_FCNFG & FTFL_FCNFG_EEERDY_MASK));

*((uint8_t *)(BYTE_COUNTER_ADDR)) = 0x0;

while(!(FTFL_FCNFG & FTFL_FCNFG_EEERDY_MASK));

}

address = 0x14000000;

size = 0x06;

source = (unsigned int)buffer;

EEEWrite(address, size, source);

// EEE_read_data(dataread,6,address);

return 0;

}

Re: The example flexnvm code is not working on our processor : MK50DX256CLL10

danielchen — Fri, 07 Aug 2015 06:03:13 GMT

For full EEPROM, MQX has an example for Kinetis FTFL flash (for example twrk20d72 BSP).

The flexNVM example for this hardware is

c:\Freescale\Freescale_MQX_4_0\mqx\examples\flexnvm\flexnvm_demo.c

The low level Kinetis MQX FTFE driver:

c:\Freescale\Freescale_MQX_4_0\mqx\source\io\flashx\freescale\flash_ftfe.c

will need to be customized for flexnvm (add flexnvm_ ioctl commands as in flash_ftfl.c).

I think you can port it to your BSP, you can refer to the following link

MQX FlashX driver – how to write FlexNVM?

Have a nice day,
Daniel

MQX Software Solutions中的主题 The example flexnvm code is not working on our processor : MK50DX256CLL10

The example flexnvm code is not working on our processor : MK50DX256CLL10

Re: The example flexnvm code is not working on our processor : MK50DX256CLL10