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13 Update firmware
13.1 Update firmware trough TTL UART by protocol YMODEM 1K
•
Connect the jumper to pins 2 and 3 (TxD and RxD) of the PROG connector (JP8)
and turn the clock on or reset by pressing the RESET button. Remove the jumper
from the PROG connector
•
Remove the jumper from the PROG connector
•
Connect the clock to the computer using the USB to TTL UART (3V3) adapter. On
the clock side, connect the adapter to the PROG connector.
•
On a computer, run a terminal supporting file transfer using the YMODEM 1K
protocol (eg ExtraPuTTY) with parameters 57600 bps, 8 databits, 1 stop, no parity,
no control.
•
In the terminal, open a valid COM port corresponding to the connected USB to TTL
UART adapter.
•
Connect the jumper to the ISPE header (JP9). The terminal will then display the
initial information about the firmware update.
Pin description
1=GND
2=TXD
3=RXD
4=RESET
5=3V3
