document flashing procedure for sysmoOCTSIM
the sysmoOCTSIM board does not have an onboard EDBG adapter such as the SAM E54 Xplained Pro board. instead SWD is used directly. Change-Id: I85aa4db62464d0a1b558968d0423e2adbe491a4f
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README.md
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README.md
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This is an implementation of the DFU mode of the [USB DFU Device Class Specification](https://usb.org/document-library/device-firmware-upgrade-11-new-version-31-aug-2004) for the Microchip SAM D5x/E5x micro-controller.
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It is meant to be used as bootloader to allow flashing the main application over USB.
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The code has been developed for the Microchip [SAM E54 Xplained Pro](https://www.microchip.com/DevelopmentTools/ProductDetails/PartNo/ATSAME54-XPRO) development board using a [SAM E54](https://www.microchip.com/wwwproducts/en/ATSAME54P20A) micro-controller.
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It should work on any chip of the SAM D5x/E5x device family by replacing the corresponding device-specific definitions (usually including the chip name in the file name).
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This branch is specific to the proprietary sysmocom sysmoOCTSIM hardware.
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The code uses the [Atmel START](https://start.atmel.com/) ASFv4 library.
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Flashing
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========
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To flash the bootloader you can either use the [edbg tool](https://github.com/ataradov/edbg) over the EDBG interface of the SAM E54 Xplained Pro development board, or OpenICD with any SWJ adapter.
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To flash the bootloader you can use OpenOCD with any SWJ adapter.
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The USB DFU bootloader should be flashed in a protected area of the flash memory to prevent for erasing it, as specified in data sheet section 25.6.2 Memory Organization.
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The bootloader size is configured in the NVM user configuration BOOTPROT field, as specified in data sheet section 25.6.9 NVM User Configuration.
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This setting will also tell the bootloader where to flash the application firmware to (e.g. after the bootloader reserved space).
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The LED will blink once per second if this size is not set.
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EDBG
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----
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ST-LINK/V2
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----------
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To flash the USB DFU bootloader, perform the following actions:
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* remove reserved bootloader space so we can erase it: `edbg --target atmel_cm4v2 --fuse wv,29:26,15`
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* erase the whole flash: `edbg --target atmel_cm4v2 --fuse v,29:26,15 --erase`
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* program the bootloader: `edbg --target atmel_cm4v2 --fuse v,29:26,15 --program --verify --file AtmelStart.bin`
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* reserve bootloader space: `edbg --target atmel_cm4v2 --fuse wv,29:26,13`
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To flash the USB DFU bootloader, we will use OpenOCD (with the [SAM E54 patch](http://openocd.zylin.com/#/c/4272/) and a ST-LINK/V2 SWD adapter.
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The command will perform the following actions:
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* remove reserved bootloader space so we can erase it (and reset MCU for change to be effective)
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* erase the whole flash
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* program the bootloader
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* reserve bootloader space
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`openocd --file interface/stlink.cfg --command "transport select hla_swd" --command "set CHIPNAME same54" --command "set CPUTAPID 0x2ba01477" --file target/atsame5x.cfg --command "init" --command "reset halt" --command "atsame5 bootloader 0" --command "flash erase_sector 0 0 last" --command "reset halt" --command "program ./AtmelStart.bin" --command "atsame5 bootloader 16384" --command "reset run" --command "shutdown"`
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