Specs
- TI CC1110 - 26Mhz 8051 32kB Flash / 4kB RAM
- 2.6 x 1.10 in ePaper display (BWR or BWY) 296x128px
- 128Kbyte SPI flash
- 2 x CR2450 button cell
- SubGhz (868 Mhz / 915 Mhz) Radio
- FCC ID: VC7120-0112
Status
The firmware images are available here,
For Chroma 29s with serial numbers ending in "B" try the chroma29_full_xxxx image, for tags with serial numbers ending in "C" try the chroma29_8151_full_xxxx image.
It is possible that the firmware will work with versions not listed in the chart below, if you test the beta on another board issue please report your finding if it works or not.
Other versions of the Chroma29 MAY be supported in the future.
Programming
See Flashing CC1110 Based Chroma tags for information on how to flash custom firmware onto the Chroma29.
Chroma29 Programming Jigs
Discord user mindstormer7 designed a handy programming jig for the Chroma29 rev 'B' which is particularly helpful if you have more than one that you want to flash.
The 'C' version of this tag has test points accessible from the battery compartment w/o disassembling the tag!
Discord user T0b! designed a programming jig for the Chroma29 rev 'C'
History
The were several versions of the Chroma29 which are/were manufactured, unfortunately they are not all compatible.
If you have version of the Chroma29 not listed before we PLEASE add details you can provide in the following table.
| Supported | SN Format | Board Rev | Controller | EPD Panel | Notes |
|---|---|---|---|---|---|
| Y | JA000xxxxxB | edk286 Issue 8 220-0067-08 2014 |
similar to UC8154 | WF0290T1PBZ01 | Display is always enabled (nEnable is ignored) |
| Y | JA001xxxxxB or JA003xxxxxB or JA004xxxxxB or JA1xxxxxxxB |
edk286 Issue 9 220-0067-09 2015 |
similar to UC8154 | WF0290T1PBZ01 | 1. EPD pin 4&5 (VGL,VGH) are n/c 2. Q2 & Q3 added for nEnable |
| N | JFxxxxxxxxB | edk286 Issue 12 220-0067-12 2015 |
? | WF0290T1DBZ010E42 cable |
Note: Some Issue 9 tags also start with JF these may be BWY rather than BWR models. |
| Y | JA1xxxxxxxC | edk296 Issue 1 220-0094-01 2018 |
similar to UC8151C | WFD0290BF33 | Rev supported by Dmitry's original firmware |
| Not yet, a port has been started |
MExxxxxxxxC | edk505 Issue4 220-0095-004 2019 |
? | DEPG0290RWU51011HPB1E | Processor is a CC1310 FCC ID: VC7120-0200 |
Battery Current
The expected battery current while the tag is sleeping between updates is about 1.2 microamps for a JA1xxxxxxxB tag and about 1.7 microamps for a JA000xxxxxB tag.
Later versions of the tag include a FET that disconnects the power to the EPD while it isn't being accessed. The JA000xxxxxB version does not have this FET which is why the sleep current is a little higher.
General Chroma 29 Info
Known EPD controllers are either similar to the UC8151 or the UC8154 depending on version.
The SPI flash chip is the 128k byte MX25V1006E.
The flash is organized as 32 4k sectors or 2 65k blocks. Sectors, blocks, or the entire chip can be erased at a time.
CC Debugger Connections
| Test point | Signal | CC debugger pin |
|---|---|---|
| TP8 | J3, GND | 1 |
| TP5 | DC | 3 |
| TP4 | J2, +VBAT | 2 (and 9 to power board from debugger) |
| TP3 | DD | 4 |
| TP2 | Reset_n | 7 |
Debug Serial port Connections
Connecting a serial port to the Chroma is very handy for development but it is not needed if you just want to flash custom firmware.
| Test point | Signal | FTDI |
|---|---|---|
| J3 | GND | Black |
| TP7 | Serial out | Yellow |
| TP9 | Serial in | Orange |
Chroma 29 Test Points
| Test point | Signal |
|---|---|
| TP2 | Reset_n |
| TP3 | DD |
| TP4 | J2, +VBAT |
| TP5 | DC |
| TP6 | P0_1 |
| TP7 | P1.6 (Serial out) |
| TP8 | J3, GND |
| TP9 | P1_7 (Serial in) |
| TP10 | J1.23 PREVGL ? |
| TP11 | J1.21 PREVGH ? |
UC8154 LUTs
The following tables were captured from the EPD SPI bus while sending an image using atc1441's Custom PriceTag Access Point to a tag running stock firmware.
| Table | Values |
|---|---|
| Vcom1 LUT (Cmd 0x20) |
0x01 0x01 0x01 0x03 0x04 0x09 0x06 0x06 0x0A 0x04 0x04 0x19 0x03 0x04 0x09 |
| White LUT (Cmd 0x21) |
0x01 0x01 0x01 0x03 0x84 0x09 0x86 0x46 0x0A 0x84 0x44 0x19 0x03 0x44 0x09 |
| Black LUT (Cmd 0x22) |
0x01 0x01 0x01 0x43 0x04 0x09 0x86 0x46 0x0A 0x84 0x44 0x19 0x83 0x04 0x09 |
| Gray1 LUT (Cmd 0x23) |
|
| Gray2 LUT (Cmd 0x24) |
|
| Vcom2 LUT (Cmd 0x25) |
0x0A 0x0A 0x01 0x02 0x14 0x0D 0x14 0x14 0x01 0x00 0x00 0x00 0x00 0x00 0x00 |
| Red0 LUT (Cmd 0x26) |
0x4A 0x4A 0x01 0x82 0x54 0x0D 0x54 0x54 0x01 0x00 0x00 0x00 0x00 0x00 0x00 |
| Red1 LUT (Cmd 0x27) |
0x0A 0x0A 0x01 0x02 0x14 0x0D 0x14 0x14 0x01 0x00 0x00 0x00 0x00 0x00 0x00 |
3D Printable Stand
Discord user MaZZly has created a 3d printable stand for the Chroma 29
The STL file can be downloaded from here.
3D Printable Holder
Discord user MaZZly also created a 3d printable holder for the Chroma 29
- Stand works fine without supports, but could be enabled
- Holder should be printed standing, might need brim if you don't have good plate adhesion
The STL file can be downloaded from here.