pblprog-sifli
pblprog-sifli is the Pebble programmer for the SiFli SF32LB52 boards. It
is a USB to serial adapter that connects to the watch’s B2B
(board-to-board) connector through a flex cable, and gives the host the
watch’s debug UART, a reset line and, optionally, power to charge it.
- Boards:
- Host interface:
USB-C: serial port (WCH CH343P)
- Target interfaces:
Debug UART, reset, VBUS
- Runners:
sftool- Design files:
pblprog-sifli-board
pblprog-sifli-flex
Features
USB-C connector, with an overcurrent fuse and ESD protection
WCH CH343P USB to UART converter. Its I/O is powered by the watch (
VIO), so the UART always runs at the watch’s logic level.Reset: the
RSTbutton, or the serial port’s RTS line, resets the watch. RTS reaches the reset line through theJP1solder jumper, bridged by default; cut it to keep the host from resetting the watch.Charge switch: with
CHGon, the USB 5 V feeds the watch’sVBUSand charges it while connected.Molex SlimStack 505004-0812 B2B receptacle, for the flex cable
Connector
Pin |
Signal |
Description |
|---|---|---|
1 |
Not connected |
|
2 |
|
Watch reset, active low |
3 |
|
Programmer transmit, to the watch |
4 |
|
Ground |
5 |
Not connected |
|
6 |
|
Watch I/O voltage, powers the UART |
7 |
|
5 V to the watch, through the |
8 |
|
Programmer receive, from the watch |
Flex cable
pblprog-sifli-flex has a Molex SlimStack 505006-0812 plug on each end and
connects the programmer to the watch. Its pins are reversed end to end
(1–4, 2–3, 5–8, 6–7), matching the orientation of the two connectors.