SI4432 ISM Transceiver driver for esp-idf

esp-idf-si4432

SI4432 ISM Transceiver driver for esp-idf.

SI4432-433MHz-2 54mm

I refered this.

Software requirements

esp-idf v4.4 or later.
This is because this version supports ESP32-C3.

Installation

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

config-si4432-1 config-si4432-2

SPI BUS selection

config-si4432-3

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

config-top config-app

  • 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-C3
MISO -- GPIO19 GPIO37 GPIO18
SCK -- GPIO18 GPIO36 GPIO10
MOSI -- GPIO23 GPIO35 GPIO19
SEL -- GPIO5 GPIO34 GPIO7
SDN -- GPIO15 GPIO40 GPIO8
IRQ -- GPIO16 GPIO41 GPIO9
GND -- GND GND GND
VCC -- 3.3V 3.3V 3.3V

You can change it to any pin using menuconfig.

Screen Shot

ScrrenShot-1 ScrrenShot-2

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
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