Support RF Control

[TriForMine]

I have successfully flashed this product: https://fr.aliexpress.com/item/1005004558905919.html

Is there any way the RF part would be supported?

Pins

I have the IR Receiver/Transmitter working perfectly with the following pins: P7 - IRSend P8 - IRRecv P9 - WifiLED

Photos

[ataa]

I have similar one with model S11 label, it has BK7231N and SH4 modules. PCB Version S11-SH4-CBU-V2.4 SH4 Module Datasheet

[uzlonewolf]

I traced most of the other pins out:

CBU Pin	BK7231N	Function	Pad
1	P14 (SPI_SCK)	SH4 CLK	SCK
2	P16 (SPI_MOSI)	SH4 SDIO via R9
3	P20	SH4 GPIO1	INT1
4	P22	SH4 GPIO2	INT2
5	ADC	Button (S1) via RC network	ADC
6	RX2
7	TX2
8	P8	IR receiver
9	P7	IR tx
10	P6
11	P26
12	P24
13	GND	GND	GND
14	3V3	3V3	3V3
15	TX1		TXD
16	RX1		RXD
17	P28
18	CEN	CEN
19	P9	Status LED
20	P17 (SPI_MISO)	~~SH4 SDIO via (not populated) R18~~
21	P15 (SPI_CS)		CSN

Tuya's info page on the SH4 says it uses the CMTOV30-EQR chip. While I couldn't find that exact chip, CMOSTEK's CMT2300 has a suspiciously similar part number (CMT2300A-EQR) and the same pinout.

[Marcos-Reckers]

I have the same module. I used GPT help to identifying and configuring the pins for both IR and RF functionalities.

Pin Mapping Table

Here's a consolidated table mapping the IR and RF pins between the CBU (BK7231N) and SH4 modules based on the datasheets:

CBU Pin (BK7231N)	Function	SH4 Pin	Function
P7	IRSend	N/A	IR Transmission
P8	IRRecv	N/A	IR Reception
P14	SPI_SCK	SPI_CLK	SPI Clock Signal
P15	SPI_CS	SPI_CS	SPI Chip Select
P16	SPI_MOSI	SDIO	SPI Data (MOSI)
P17	SPI_MISO	SDIO	SPI Data (MISO)
P20	GPIO/Interrupt	GPIO1/INT1	Digital I/O
P22	GPIO/Interrupt	GPIO2/INT2	Digital I/O
P9	GPIO (Status LED)	N/A	Status LED

Steps to Connect and Configure

1. Identify and Connect Pins on PCB:

   • Verify the corresponding pins on your device's PCB and make connections as per the table above.

2. Configure OpenBK7231T Firmware:

   • After connecting the pins correctly, access the OpenBK7231T web interface to configure the pins. Example YAML configuration:

     pins:
       - pin: P7
         function: IRSend
       - pin: P8
         function: IRRecv
       - pin: P14
         function: SPI_SCK
       - pin: P15
         function: SPI_CS
       - pin: P16
         function: SPI_MOSI
       - pin: P17
         function: SPI_MISO
       - pin: P20
         function: GPIO  # or INT1, as needed
       - pin: P22
         function: GPIO  # or INT2, as needed
       - pin: P9
         function: StatusLED
     

3. Test Functionality:

   • Use the OpenBK7231T web interface or MQTT commands to test IR and RF functionalities. Monitor the logs to verify signals are processed correctly.

Useful Resources and Documentation

For more details on IR and RF configuration support in OpenBK7231T, check out these sources:

• OpenBK7231T on GitHub
• CBU Module Datasheet
• SH4 Module Datasheet