sd_flash_page_erase.

[Mike_Learning]

I am trying to save data to the flash memory.  My starting file is the ble_app_uart_pca10040 (s132). I am using the sd_flash_write address is 0x007ffd0 and a value of 0; I then use uint16_t value1 = *(uint16_t *)ADDRESS_ADR which is set to 0x7ffdo. I have verified that the write and read work! Now I need to erase the flash so I can use it again! I have tried page numbers (1 through 3) and it has not work! I would really like to just erase one 32 bit area od the flash! (And have the code as simple as possible!

Thanks!

Mike

[Jørgen Holmefjord]

Hi,

Pages 1-3 are in the softdevice region in flash. You will not be able to erase these pages, as they are protected. Address 0x0007ffd0 should be on page 127, see figure 1 in Memory documentation in PS.

Best regards,
Jørgen

[Mike_Learning]

At first did not appear to work!

This is in the Routine that is called when I send my value to trigger the erase:

 printf("\r Before Flash \r\n");
                      printf("%#08x\n",value );
                      printf("\r   Done \r\n");  

         sd_flash_page_erase(127);
                   /**  flash_write(ADDRESS_ADR,Val1);  */       /** This works but writes from 0x007ffd0 to 0X007ffd3 */
                                                                 /** OR 0X007ffd4 to 0X007ffd7   It writes to Four Locations */

                uint16_t value1 = *(uint16_t *)ADDRESS_ADR;              /** Display what is stored at memory location STORAGE_Add */
                printf("\r After Flash Value \r\n");
                printf("%#08x\n",value1 );
                printf("\r   Done \r\n"); 

This is what is viewed when the Erase is activated:

 Before Flash
0x000000
   Done
 After Flash Value
0x000000
   Done

When I run the program again this is what displayed:

 Before Flash
0x00ffff
   Done
 After Flash Value
0x00ffff
   Done

So there must be a delay for it to finish the erase! Is there a command or something simple to delay until it has finished

[Jørgen Holmefjord]

Please see the documentation of the sd_flash_page_erase() function. You will get one of the following event following the function call:

• NRF_EVT_FLASH_OPERATION_SUCCESS - The command was successfully completed.
• NRF_EVT_FLASH_OPERATION_ERROR - The command could not be started.

[Mike_Learning]

Thank You! I will research into how to use them!