Looking at the code it shows `am_bsp_pins.c` to have
- `am_bsp_pins.h` sets `AM_BSP_GPIO_LED_BLUE` to `37`
- `am_bsp_pins.c` sets `g_AM_BSP_GPIO_LED_BLUE.uFuncSel`to `AM_HAL_PIN_37_GPIO`
Looking at the Nano schematics we see pad 19 maps to GPIO 19 which is assigned to LED and printed next to the LED. This makes me think 37 is incorrect the above values should be `19` and `AM_HAL_PIN_19_GPIO` respectively but this does not work either.
It seems the Thing Plus is set up this way (assuming it can run blinky...). Looking its schematics we see pas 26 maps to GPIO 18 which is assigned to the LED and also printed on the PCB next to the LED. In its respective files it has `AM_BSP_GPIO_LED_BLUE` set to 26 and `g_AM_BSP_GPIO_LED_BLUE.uFuncSel` set to `AM_HAL_PIN_26_GPIO`.