dpwe/rdspi

Si4703 based RDS scanner for Raspberry Pi

RdSpi

Si4703 based RDS scanner for Raspberry Pi using Si4703S-B16 breakout board PL102RT-S V1.5

Installation

Connect PL102RT-S V1.5 breakout to Rpi:

RPi	PL102RT-S
SDA	SDIO
SCL	SCLK
#23 (GP4)	RST
GND	GND
3.3V	Vd

To make communication more stable connect RST pin to a pullup resistor.

If in addition to RDS scanning you want to listen to radio audio then connect whatever amplifier you have to LOUT/ROUT. Adafruit MAX98306 works just fine.

Make RdSpi. It accepts one command at a time:

• cmd - run in interactive command mode
• reset - resets and powers up Si4703, dumps register map while resetting
• power on|down - powers Si4703 up or down
• dump - dumps Si4703 register
• spacing kHz - sets 200, 100, or 50 kHz spacing
• scan (mode) - scans for radio stations, mode can be specified 1-5, see AN230, Table 23. Summary of Seek Settings
• spectrum - scans full FM band and prints RSSI
• seek up|down - seeks to the next/prev station
• tune freq - tunes to specified FM frequency, for example rdspi tune 9500 or rdspi tune 95.00 or rdspi tune 95. to tune to 95.00 MHz
• rds on|off|verbose - sets RDS mode, on/off for RDSPRF, verbose for RDSM
• rds [gt G] [time T] [log] - scan for RDS messages. Use to gt specify RDS Group Type to scan for, for example 0 for basic tuning and switching information. Use time to specify timeout T in seconds. T = 0 turns off timeout. Use log to scroll output instead on using one-liners.
• rds - scan for complete RDS PS and Radiotext messages with default 15 seconds timeout
• volume 0-30 - set audio volume, 0 to mute
• set register=value - set specified register

It is better to start with reset :) Note that reset requires sudo to write to reset pin, other commands can be used without sudo.

$sudo rdspi reset
$rdspi tune 95.00
$rdspi volume 10
$rdspi set volext=1
$rdspi dump

To disable output use --silent as the last command line parameter:

$sudo rdspi reset --silent
$rdspi tune 9500  --silent

Screenshots

• rdspi dump
• rdspi scan
• rdspi spectrum
• rdspi rds log

Links

• Si4702/03 FM Radio Receiver ICs
• Si4703S-C19 Data Sheet
• Si4703S-B16 Data Sheet: Not on SiLabs site anymore, google for it
• Si4700/01/02/03 Firmware Change List, AN281: Not on SiLabs site anymore, google for it
• Using RDS/RBDS with the Si4701/03
• Si4700/01/02/03 Programming Guide
• RBDS Standard: ftp://ftp.rds.org.uk/pub/acrobat/rbds1998.pdf