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# card10 Firmware Readme
## Toolchain
The card10 is based on an ARM Cortex-M4F CPU. To compile the firmware, you need a working cross compiler. To flash the firmware, you either need to use the bootloader or an SWD adapter and OpenOCD.
### GCC
Please install `arm-none-eabi-gcc` on your system. Most distributions have it packaged (might be named `gcc-arm-none-eabi`). You can also download a precompiled toolchain from [ARM](https://developer.arm.com/tools-and-software/open-source-software/developer-tools/gnu-toolchain/gnu-rm/downloads).
### GDB
If you want to debug code or replace the bootloader, you need OpenOCD and GDB.
Use `arm-none-eabi-gdb` (might be packaged as `gdb-arm-none-eabi` or get it from the binary distribution above).
Add the following line to your `~/.gdbinit` file:
```
add-auto-load-safe-path <PATH TO THIS REPOSITORY>
```
This allows gdb to use our .gdbinit files without specifying them on the command line.
### OpenOCD
If you want to debug code or replace the bootloader, you need OpenOCD and GDB.
Get OpenOCD from [Maxim](https://github.com/maximmbed/openocd) and checkout the `max32xxx` branch. Build using `./configure` and 'make'. Make sure that the `CMSIS-DAP Compliant Debugger` is set to `yes(auto)` after running `./configure` (you might need to install libusb and other USB related libaries).
Please run `make install` after removing any already installed OpenOCD version. Otherwise please always specify the full path to openocd (the binary is under `src/openocd`, when calling `openocd`.
Run OpenOCD from the root `openocd/scripts` directory in this repository like this: `openocd -f interface/cmsis-dap.cfg -f target/max32665.cfg`. It should display something similar to:
```
Info : CMSIS-DAP: SWD Supported
Info : CMSIS-DAP: FW Version = 1.0
Info : CMSIS-DAP: Interface Initialised (SWD)
Info : SWCLK/TCK = 0 SWDIO/TMS = 1 TDI = 0 TDO = 0 nTRST = 0 nRESET = 1
Info : CMSIS-DAP: Interface ready
Info : clock speed 2000 kHz
Info : SWD DPIDR 0x2ba01477
Info : max32xxx.cpu: hardware has 6 breakpoints, 4 watchpoints
Info : Listening on port 3333 for gdb connections
```
## Debugger Connection
If you have the debugger provided with the `card10`, connect it as follows:
- `HDK`: This connection provides debugging (SWD) and UART
- `DEV`: This connection provides power (battery charger) and the native USB connection (bootloader)
- `USB-C`: Connect the proved USB-C cable with the side which has the blue dot, so the blue dots have the same side
Now connect the USB-C cable, so the name of the cable manufacturer facing downwards (i.e. is not visible when looking at the display).
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## Compiling
Simply go to an example and run `make`. If you used the `./build_image` command before (see section "Bootloader"), run a `make clean` before. TODO: Unify the two build options.
## Flashing
Run `arm-none-eabi-gdb` in the applications folder. It should connect to OpenOCD and say something like:
```
TMR_Delay (tmr=tmr@entry=0x40010000, us=us@entry=10000, sys_cfg=sys_cfg@entry=0x0) at Source/tmr_utils.c:59
59 while (TMR_TO_Check(tmr) != E_TIME_OUT) {}
(gdb)
```
Enter `load`. It should say something like:
```
(gdb) load
Loading section .text, size 0x12514 lma 0x10010000
Loading section .ARM.exidx, size 0x8 lma 0x10022514
Loading section .data, size 0x8d8 lma 0x1002251c
Start address 0x10012160, load size 77300
Transfer rate: 19 KB/sec, 11042 bytes/write.
(gdb)
```
To run the program, type: `mon mww 0x40000004 0x80000000`. This is a quirk as the prototypes to not have a reset line exposed to the debugger. Will be solved with production hardware.
TODO: Provide a make command to flash card10.
## Debugging
After flashing and the initial reset using `mon mww 0x40000004 0x80000000`, you can say `mon reset halt` and then `continue`. You can now debug as usual.
## Serial Console
card10 outputs debug information on the serial console. Baudrate is 115200. The provided USB adapter creates a CDC device (under Linux /dev/ttyACM0). You can use screen to open and view it: `screen /dev/ttyACM0 115200`.
## Bootloader
The bootloader is used to flash card10 without an external debugger. It exposes the file system via USB and accepts a `card10.bin` file as firmware image.
To flash the bootloader, go to the `bootloader` directory and follow the steps above.
To execute the bootloader, turn off card10, press the lower right button and turn on. Connect card10 via a USB cable to a computer and mount the file system. You can now copy your card10.bin file to the file system. Eject the drive (IMPORTANT!) via your operating system. Turn card10 off and back on again. It will try to boot the image.
IMPORTANT: The prototypes have the USB data lines reversed. Use the provided USB adapter to connect card10.
### Building card10.bin
Run `./build_image`. TODO: Add to makefile
The tool uses Python to generate a CRC. Make sure to have `python-crc16` installed.
## Examples
### Hello World
Turns on the display, enumerates I2C, prints debug information on the console.