Changes

When [[Ernie_Firmware#JIG_Enable|JIG is enabled]], commands can be sent through an UART interface by an external agent. An UART RX interrupt will flag asynchronous handler <code>0xB</code>. This handler is registered at the start of the Worker Loop to set flag <code>0x32</code> and return. In the Worker Loop, flag <code>0x32</code> can be handled by states 1, 3, 8, 9. In any of these states, the JIG Handler is called.

When [[Ernie_Firmware#JIG_Enable|JIG is enabled]], commands can be sent through an UART interface by an external agent. An UART RX interrupt will flag asynchronous handler <code>0xB</code>. This handler is registered at the start of the Worker Loop to set flag <code>0x32</code> and return. In the Worker Loop, flag <code>0x32</code> can be handled by states 1, 3, 8, 9. In any of these states, the JIG Handler is called.

JIG packets follow the same format as the Command Handler packets (2 byte command id, optional length payload, 1 byte checksum) but the packets are ASCII encoded, so every raw byte is represented by two printable ASCII bytes.

JIG packets are ASCII encoded hex (each raw byte is 2 ASCII bytes) and end in \r\n. Once decoded into raw bytes, the packet is 2 byte command id, 1 byte unknown, 2 byte length*2 (equal to raw packet length - 7), a payload, and 2 byte checksum.

= Kermit Bootrom JIG Mode =

= Kermit Bootrom JIG Mode =