esp-idf-si4432

SI4432 ISM Transceiver driver for esp-idf.

I refered this.

• 2.54mm pitch 433MHz
  

• 1.27mm pitch 433MHz
  Pinout is here
  

Software requirements

ESP-IDF V4.4/V5.x.
ESP-IDF V5.0 is required when using ESP32-C2.
ESP-IDF V5.1 is required when using ESP32-C6.

Installation

git clone https://github.com/nopnop2002/esp-idf-si4432
cd esp-idf-si4432
idf.py set-target {esp32/esp32s2/esp32s3/esp32c2/esp32c3/esp32c6}
idf.py menuconfig
idf.py flash

Note for ESP32C3
For some reason, there are development boards that cannot use GPIO06, GPIO08, GPIO09, GPIO19 for SPI clock pins.
According to the ESP32C3 specifications, these pins can also be used as SPI clocks.
I used a raw ESP-C3-13 to verify that these pins could be used as SPI clocks.

Configuration for Transceiver

SPI BUS selection

The ESP32 series has three SPI BUSs.
SPI1_HOST is used for communication with Flash memory.
You can use SPI2_HOST and SPI3_HOST freely.
When you use SDSPI(SD Card via SPI), SDSPI uses SPI2_HOST BUS.
When using this module at the same time as SDSPI or other SPI device using SPI2_HOST, it needs to be changed to SPI3_HOST.
When you don't use SDSPI, both SPI2_HOST and SPI3_HOST will work.
It was called HSPI_HOST / VSPI_HOST, but it is not defined in SoCs other than ESP32.

Configuration for Application

• Enable Ping-Pong
  Send data from TX to RX.
  In the RX, the characters are converted and sent back to TX.
  TX waits for a response from RX.

Wirering

SI4432		ESP32	ESP32-S2/S3	ESP32-C2/C3/C6
MISO	--	GPIO19	GPIO37	GPIO4
SCK	--	GPIO18	GPIO36	GPIO3
MOSI	--	GPIO23	GPIO35	GPIO2
SEL	--	GPIO5	GPIO34	GPIO1
SDN	--	GPIO15	GPIO40	GPIO5
IRQ	--	GPIO16	GPIO41	GPIO6
GND	--	GND	GND	GND
VCC	--	3.3V	3.3V	3.3V

You can change it to any pin using menuconfig.

Screen Shot

Comparison of nRF905, cc1101 and si4432

	nRF905	cc1101	si4432
Manufacturer	Nordic Semiconductor	Texas Instrument	Silicon Labs
Frequency	433/868/915MHz	315/433/868/915MHz	315/433/868/915MHz
Maximum Payload	32Byte	64Byte	64Byte
FiFo for reception	32Byte*1	64Byte*1	64Byte*1
FiFo for transmission	32Byte*1	64Byte*1	64Byte*1
CRC Length	8/16bits	16bits	8/16bits
Acknowledgement Payload	No	No	No
Modulation format	GFSK	2-FSK/4-FSK/GFSK/ASK/OOK/MSK	FSK/GFSK/OOK

• GFSK : Gaussian shaped Frequency Shift Keying
• FSK : Frequency Shift Keying
• 2-FSK : Binary Frequency Shift Keying
• 4-FSK : Quaternary Frequency Shift Keying
• ASK : Amplitude Shift Keying
• OSK : On-Off Keying
• MSI : Minimum Shift Keying