spi_flash_erase

Functions
sint8	spi_flash_erase (uint32 u32Offset, uint32 u32Sz)
	Erase a specified portion of SPI Flash. . More...

sint8 spi_flash_erase	(	uint32	u32Offset,
		uint32	u32Sz
	)

Erase a specified portion of SPI Flash.
.

Parameters

[in]	u32Offset	Address (Offset) to erase from the SPI flash.
[in]	u32Sz	Total number of bytes required to be erased.

Note

It is blocking function

Warning

• Address (offset) plus size of data must not exceed flash size.
  
• No firmware is required for writing to SPI flash.
  
• In case of there is a running firmware, it is required to pause your firmware first before any trial to access SPI flash to avoid any racing between host and running firmware on bus using m2m_wifi_download_mode

See Also

m2m_wifi_download_mode, spi_flash_get_size

Returns

The function returns M2M_SUCCESS for successful operations and a negative value otherwise.

Example

*                  #include "spi_flash.h"
*
*                  #define DATA_TO_REPLACE "THIS IS A NEW SECTOR IN FLASH"
*
*                  int main()
*                  {
*                      uint8   au8FlashContent[FLASH_SECTOR_SZ] = {0};
*                      uint32  u32FlashTotalSize = 0;
*                      uint32  u32FlashOffset = 0;
*
*                      ret = m2m_wifi_download_mode();
*                      if(M2M_SUCCESS != ret)
*                      {
*                          printf("Unable to enter download mode\r\n");
*                      }
*                      else
*                      {
*                          u32FlashTotalSize = spi_flash_get_size();
*                      }
*
*                      while((u32FlashTotalSize > u32FlashOffset) && (M2M_SUCCESS == ret))
*                      {
*                          ret = spi_flash_read(au8FlashContent, u32FlashOffset, FLASH_SECTOR_SZ);
*                          if(M2M_SUCCESS != ret)
*                          {
*                              printf("Unable to read SPI sector\r\n");
*                              break;
*                          }
*                          memcpy(au8FlashContent, DATA_TO_REPLACE, strlen(DATA_TO_REPLACE));
*
*                          ret = spi_flash_erase(u32FlashOffset, FLASH_SECTOR_SZ);
*                          if(M2M_SUCCESS != ret)
*                          {
*                              printf("Unable to erase SPI sector\r\n");
*                              break;
*                          }
*
*                          ret = spi_flash_write(au8FlashContent, u32FlashOffset, FLASH_SECTOR_SZ);
*                          if(M2M_SUCCESS != ret)
*                          {
*                              printf("Unable to write SPI sector\r\n");
*                              break;
*                          }
*                          u32FlashOffset += FLASH_SECTOR_SZ;
*                      }
*
*                      if(M2M_SUCCESS == ret)
*                      {
*                          printf("Successful operations\r\n");
*                      }
*                      else
*                      {
*                          printf("Failed operations\r\n");
*                      }
*
*                      while(1);
*                      return M2M_SUCCESS;
*                  }
* 

Parameters

[in]	u32Offset	Address (Offset) to erase from the SPI flash.
[in]	u32Sz	Size of SPI flash required to be erased.

Note

It is blocking function

Warning

• Address (offset) plus size of data must not exceed flash size.
  
• No firmware is required for writing to SPI flash.
  
  • In case of there is a running firmware, it is required to pause your firmware first before any trial to access SPI flash to avoid any racing between host and running firmware on bus using m2m_wifi_download_mode
  • It is blocking function
    

See Also

m2m_wifi_download_mode, spi_flash_get_size

Returns

The function returns M2M_SUCCESS for successful operations and a negative value otherwise.

References FLASH_PAGE_SZ, i, j, M2M_DBG, M2M_ERR_FAIL, M2M_PRINT, M2M_SUCCESS, MAX_ATTEMPT_STATUS_READ, MAX_PROG_CNT, MAX_RETRY, ret, spi_flash_read_status_reg(), spi_flash_sector_erase(), and spi_flash_write_enable().

Referenced by m2m_flash_erase_sector(), and update_control_structure().