[ARM] Integrating External flash W25Q64FV with EFR32MG21 micro-controller

hrishie89

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Hello everyone. I've been trying to use external flash W25Q64FV integrating with EFR32MG21 micro-controller.
I am using this driver https://github.com/nimaltd/spif and below is the example code

SPIF_Init(&spif, &hspi1, SPI_CS_GPIO_Port, SPI_CS_Pin);
for(int i=0; i<256;i++){
testwrite=i+45;
}
SPIF_EraseSector(&spif, 0);
SPIF_WritePage(&spif, 0, testwrite, 256, 0);
SPIF_ReadPage(&spif, 0, testRead, 256, 0);

so in this example, I can see that i'm able to read the data which is already there on the flash at address 0;
i can erase that data too using eraseSector but when i try to write the data using WritePage , it is not writing anything, In readPage the values i get are 0xff;

same example with stm32 micro-controller is working fine can write ,read and erase.
 

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Your code example should at least show the declaration of involved variables, I'm unable to see if testwrite is correctly pointing to a page buffer and if the buffer is filled with data before calling SPIF_WritePage(). The shown code suggests it's not.
 

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#include "spif.h"
uint8_t testwrite[256]={0};
uint8_t testRead[256]={0};
SPIF_HandleTypeDef spif;

They are globally declared.
 

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FvM said:
O.k.. How should we help if you are not posting your actual code?
Click to expand...
Actually that issue got solved; I removed unnecessary things from the driver.
but now I see if I write 2kb of data i can read that data but if im writing 4kb of data; im not able to read that data it is showing 0 or 0xff.
Below is the code , driver link i already mentioned.

Code C - [expand]
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#include "spif.h"
uint8_t testwrite[2096]={0};
uint8_t testRead[2096]={0};
SPIF_HandleTypeDef spif;
void
app_init (void)
{
  mstimer_init ();
  volatile int a = 100000;
  while (a--)
    ;
  SPIF_Init (NULL, 0);
  for (int i = 0; i < 2096; i++)
    {
      testwrite[I] = i + 16;
    }
 // SPIF_EraseSector (&spif, 0);
//  SPIF_EraseChip(&spif);
//  a = millis();
 // while (millis()-a < 5000);
//
 // SPIF_WritePage (&spif, 0, testwrite, 256, 0);
 // a = millis();
 // while (millis()-a < 500);
//
//  while (1)
//    ;
  //SPIF_ReadPage (&spif, 0, testRead, 256, 0);
}
 
/*****************************************************************************
 * App ticking function.
 ******************************************************************************/
void
app_process_action (void)
{
  SPIF_EraseBlock(&spif, 0);
  SPIF_WriteBlock(&spif, 0, testwrite, 2096, 0);
  SPIF_ReadBlock(&spif, 0, testRead, 2096, 0);
}
 
Last edited by a moderator:

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Hi,

did you read the FLASH datasheet?

It says that ERASE takes time, also a WRITE takes time. During this time you usually can not read data (except status) and for sure you can not initiate another WRITE cycle.
I see nothing in your code to care for this timing.
Are you sure the used library takes care for this?

Klaus
 

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