Basic Internal Flash 1.4

Purpose

This basic demonstrates the features of the Embedded Flash Controller (EFC) present on Atmel AT91 microcontrollers. The EFC enables in-application programming of the internal flash, as well as protecting memory regions or the whole chip.

Description

The program performs the following set of commands:

• First, it unlocks the whole flash
• It writes a pattern in the last page of the flash, and checks it back
• It locks the last region of the flash, and verifies that the status is updated accordingly
• It unlocks the last region and verifies that it the status is updated accordingly
• Lastly, GPNVM #1 is cleared and set, the status being checked for update between the operations (the original state of the GPNVM is restored after this step)

Usage

1. Build the program and download it inside the evaluation board. Please refer to the SAM-BA User Guide, the GNU-Based Software Development application note or to the IAR EWARM User Guide, depending on your chosen solution.
2. On the computer, open the DBGU port with a terminal application (e.g. HyperTerminal on Microsoft Windows).
• Settings: 115200 bauds, 8 bits, 1 stop bit, no parity, no flow control.
3. Start the application.
4. The application will display the various tests it is executing and the results (example shown for the SAM9XE256):

   -- Basic Internal Flash Project 1.4 --
-I- Unlocking the whole flash
-D- Actual lock range is 0x200000 - 0x240000
-I- Writing last page with walking bit pattern
-I- Checking page contents .....................................................
........................................................................... ok
-I- Locking last page
-D- Actual lock range is 0x23C000 - 0x240000
-I- Checking lock status ... ok
-I- Unlocking last page
-D- Actual lock range is 0x23C000 - 0x240000
-I- Checking lock status ... ok
-I- GPNVM #1 is cleared
-I- Setting GPNVM #1
-I- Clearing GPNVM #1
-I- All tests ok


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