Custom Frequency Modulation (CFM) / Analog FM
CC112X supports a simple scheme to do custom frequency modulation/analog FM (e.g. communication
with analog legacy voice devices, N-FSK systems)
Arduino Uno
CCRF3 Click https://www.mikroe.com/ccrf-3-click
* Generating tone beep with CFM mode
* GDO0 connected to Arduino Uno pin 2
#include <SPI.h>
#include "cc1120.h"
#define PRINT_INFO 1
#define portOfPin(P)\
(((P)>=0&&(P)<8)?&PORTD:(((P)>7&&(P)<14)?&PORTB:&PORTC))
#define ddrOfPin(P)\
(((P)>=0&&(P)<8)?&DDRD:(((P)>7&&(P)<14)?&DDRB:&DDRC))
#define pinOfPin(P)\
(((P)>=0&&(P)<8)?&PIND:(((P)>7&&(P)<14)?&PINB:&PINC))
#define pinIndex(P)((uint8_t)(P>13?P-14:P&7))
#define pinMask(P)((uint8_t)(1<<pinIndex(P)))
#define pinAsInput(P) *(ddrOfPin(P))&=~pinMask(P)
#define pinAsInputPullUp(P) *(ddrOfPin(P))&=~pinMask(P);digitalHigh(P)
#define pinAsOutput(P) *(ddrOfPin(P))|=pinMask(P)
#define digitalLow(P) *(portOfPin(P))&=~pinMask(P)
#define digitalHigh(P) *(portOfPin(P))|=pinMask(P)
#define isHigh(P)((*(pinOfPin(P))& pinMask(P))>0)
#define isLow(P)((*(pinOfPin(P))& pinMask(P))==0)
#define digitalState(P)((uint8_t)isHigh(P))
uint8_t chipStatus = 0;
volatile int8_t t = 0;
void setup() {
Serial.begin(9600);
pinMode(RESET_PIN, OUTPUT);
pinMode(SS_PIN, OUTPUT);
pinMode(CFM_TX_DATA_CLK_PIN, INPUT);
digitalWrite(SS_PIN, HIGH);
digitalWrite(RESET_PIN, HIGH);
SPI.begin();
strobeSPI(SNOP);
// Preamble off
uint8_t v = readSPI(PREAMBLE_CFG0);
bitClear(v, 5);
writeSPI(PREAMBLE_CFG0, v);
// Sync off
v = readSPI(SYNC_CFG0);
v &= B11100011;
writeSPI(SYNC_CFG0, v);
// CRC off
v = readSPI(PKT_CFG1);
v &= B11110011;
writeSPI(PKT_CFG1, v);
writeSPI(IOCFG0, CFM_TX_DATA_CLK);
writeSPI(SYNC_CFG1, SMARTRF_SETTING_SYNC_CFG1);
writeSPI(DEVIATION_M, SMARTRF_SETTING_DEVIATION_M);
writeSPI(MODCFG_DEV_E, SMARTRF_SETTING_MODCFG_DEV_E);
writeSPI(DCFILT_CFG, SMARTRF_SETTING_DCFILT_CFG);
writeSPI(PREAMBLE_CFG1, SMARTRF_SETTING_PREAMBLE_CFG1);
writeSPI(IQIC, SMARTRF_SETTING_IQIC);
writeSPI(CHAN_BW, SMARTRF_SETTING_CHAN_BW);
writeSPI(MDMCFG0, SMARTRF_SETTING_MDMCFG0);
writeSPI(SYMBOL_RATE2, SMARTRF_SETTING_SYMBOL_RATE2);
writeSPI(SYMBOL_RATE1, SMARTRF_SETTING_SYMBOL_RATE1);
writeSPI(SYMBOL_RATE0, SMARTRF_SETTING_SYMBOL_RATE0);
writeSPI(AGC_REF, SMARTRF_SETTING_AGC_REF);
writeSPI(AGC_CS_THR, SMARTRF_SETTING_AGC_CS_THR);
writeSPI(AGC_CFG1, SMARTRF_SETTING_AGC_CFG1);
writeSPI(AGC_CFG0, SMARTRF_SETTING_AGC_CFG0);
writeSPI(FIFO_CFG, SMARTRF_SETTING_FIFO_CFG);
writeSPI(FS_CFG, SMARTRF_SETTING_FS_CFG);
writeSPI(PA_CFG2, SMARTRF_SETTING_PA_CFG2);
writeSPI(PA_CFG0, SMARTRF_SETTING_PA_CFG0);
writeSPI(PKT_LEN, SMARTRF_SETTING_PKT_LEN);
// Burst address increment disable
// writeExtAddrSPI(EXT_CTRL, EXT_CTRL_SETTTING);
// Custom frequency modulation enable
writeExtAddrSPI(CFM_DATA_CFG, CFM_DATA_CFG_SETTING);
writeExtAddrSPI(IF_MIX_CFG, SMARTRF_SETTING_IF_MIX_CFG);
writeExtAddrSPI(FREQOFF_CFG, SMARTRF_SETTING_FREQOFF_CFG);
writeExtAddrSPI(FREQ2, SMARTRF_SETTING_FREQ2);
writeExtAddrSPI(FREQ1, SMARTRF_SETTING_FREQ1);
writeExtAddrSPI(FS_DIG1, SMARTRF_SETTING_FS_DIG1);
writeExtAddrSPI(FS_DIG0, SMARTRF_SETTING_FS_DIG0);
writeExtAddrSPI(FS_CAL1, SMARTRF_SETTING_FS_CAL1);
writeExtAddrSPI(FS_CAL0, SMARTRF_SETTING_FS_CAL0);
writeExtAddrSPI(FS_DIVTWO, SMARTRF_SETTING_FS_DIVTWO);
writeExtAddrSPI(FS_DSM0, SMARTRF_SETTING_FS_DSM0);
writeExtAddrSPI(FS_DVC0, SMARTRF_SETTING_FS_DVC0);
writeExtAddrSPI(FS_PFD, SMARTRF_SETTING_FS_PFD);
writeExtAddrSPI(FS_PRE, SMARTRF_SETTING_FS_PRE);
writeExtAddrSPI(FS_REG_DIV_CML, SMARTRF_SETTING_FS_REG_DIV_CML);
writeExtAddrSPI(FS_SPARE, SMARTRF_SETTING_FS_SPARE);
writeExtAddrSPI(FS_VCO0, SMARTRF_SETTING_FS_VCO0);
writeExtAddrSPI(XOSC5, SMARTRF_SETTING_XOSC5);
writeExtAddrSPI(XOSC1, SMARTRF_SETTING_XOSC1);
#ifdef PRINT_INFO
v = readExtAddrSPI(PARTVERSION);
Serial.print(F("PARTVERSION "));
Serial.println(v, HEX);
v = readExtAddrSPI(PARTNUMBER);
Serial.print(F("PARTNUMBER "));
Serial.println(v, HEX);
#endif
strobeSPI(STX);
delay(50);
v = readExtAddrSPI(MARCSTATE);
Serial.print(F("MARCSTATE "));
Serial.println(v, BIN);
attachInterrupt(digitalPinToInterrupt(CFM_TX_DATA_CLK_PIN), isr, RISING);
}
void loop() {
}
void isr() {
// Foffset = (Fdev x value) / 64 [Hz]
digitalLow(SS_PIN);
SPI.transfer(EXT_ADDR);
SPI.transfer(CFM_TX_DATA_IN);
SPI.transfer(t);
digitalHigh(SS_PIN);
t++;
if (t > 39) {
t = 0;
}
}
void printStatus() {
Serial.println();
Serial.print(F("Chip ready: "));
Serial.println((chipStatus & B10000000) >> 7, HEX);
Serial.print(F("State: "));
Serial.println((chipStatus & B01110000) >> 4, HEX);
Serial.print(F("Reserved: "));
Serial.println(chipStatus & B00001111, HEX);
Serial.println();
}
uint8_t readSPI(uint8_t addr) {
digitalWrite(SS_PIN, LOW);
chipStatus = SPI.transfer(R_BIT | addr);
uint8_t v = SPI.transfer(0x00);
digitalWrite(SS_PIN, HIGH);
return v;
}
void writeSPI(uint8_t addr, uint8_t value) {
digitalWrite(SS_PIN, LOW);
chipStatus = SPI.transfer(addr);
chipStatus = SPI.transfer(value);
digitalWrite(SS_PIN, HIGH);
}
void writeSPIburst(uint8_t addr, uint8_t value, bool wAddr) {
digitalWrite(SS_PIN, LOW);
if (wAddr) {
chipStatus = SPI.transfer(W_BURST_BIT | addr);
}
chipStatus = SPI.transfer(value);
digitalWrite(SS_PIN, HIGH);
}
void strobeSPI(uint8_t cmd)
{
digitalWrite(SS_PIN, LOW);
chipStatus = SPI.transfer(R_BIT | cmd);
digitalWrite(SS_PIN, HIGH);
}
uint8_t readExtAddrSPI(uint8_t addr) {
uint8_t v;
digitalWrite(SS_PIN, LOW);
chipStatus = SPI.transfer(R_BIT | EXT_ADDR);
SPI.transfer(addr);
v = SPI.transfer(0xff);
digitalWrite(SS_PIN, HIGH);
return v;
}
void writeExtAddrSPI(uint8_t addr, uint8_t value) {
digitalWrite(SS_PIN, LOW);
chipStatus = SPI.transfer(EXT_ADDR);
chipStatus = SPI.transfer(addr);
chipStatus = SPI.transfer(value);
digitalWrite(SS_PIN, HIGH);
}
*** cc1120.h ***
/* Address Config = No address check */
/* Bit Rate = 0.0999995 */
/* Carrier Frequency = 437.000000 */
/* Deviation = 2.998352 */
/* Device Address = 0 */
/* Manchester Enable = false */
/* Modulation Format = 2-FSK */
/* PA Ramping = false */
/* Packet Bit Length = 0 */
/* Packet Length = 33 */
/* Packet Length Mode = Fixed */
/* Performance Mode = High Performance */
/* RX Filter BW = 25.000000 */
/* TX Power = 5 */
/* Whitening = false */
#ifndef SMARTRF_CC1120_H
#define SMARTRF_CC1120_H
#define SMARTRF_RADIO_CC1120
#define SMARTRF_SETTING_SYNC_CFG1 0x0B
#define SMARTRF_SETTING_DEVIATION_M 0x89
#define SMARTRF_SETTING_MODCFG_DEV_E 0x02
#define SMARTRF_SETTING_DCFILT_CFG 0x1C
#define SMARTRF_SETTING_PREAMBLE_CFG1 0x18
#define SMARTRF_SETTING_IQIC 0xC6
#define SMARTRF_SETTING_CHAN_BW 0x08
#define SMARTRF_SETTING_MDMCFG0 0x05
#define SMARTRF_SETTING_SYMBOL_RATE2 0x0D
#define SMARTRF_SETTING_SYMBOL_RATE1 0x1B
#define SMARTRF_SETTING_SYMBOL_RATE0 0x71
#define SMARTRF_SETTING_AGC_REF 0x20
#define SMARTRF_SETTING_AGC_CS_THR 0x19
#define SMARTRF_SETTING_AGC_CFG1 0xA9
#define SMARTRF_SETTING_AGC_CFG0 0xCF
#define SMARTRF_SETTING_FIFO_CFG 0x00
#define SMARTRF_SETTING_FS_CFG 0x14
#define SMARTRF_SETTING_PA_CFG2 0x29
#define SMARTRF_SETTING_PA_CFG0 0x7E
#define SMARTRF_SETTING_PKT_LEN 0x21
#define SMARTRF_SETTING_IF_MIX_CFG 0x00
#define SMARTRF_SETTING_FREQOFF_CFG 0x22
#define SMARTRF_SETTING_FREQ2 0x6D
#define SMARTRF_SETTING_FREQ1 0x40
#define SMARTRF_SETTING_FS_DIG1 0x00
#define SMARTRF_SETTING_FS_DIG0 0x5F
#define SMARTRF_SETTING_FS_CAL1 0x40
#define SMARTRF_SETTING_FS_CAL0 0x0E
#define SMARTRF_SETTING_FS_DIVTWO 0x03
#define SMARTRF_SETTING_FS_DSM0 0x33
#define SMARTRF_SETTING_FS_DVC0 0x17
#define SMARTRF_SETTING_FS_PFD 0x50
#define SMARTRF_SETTING_FS_PRE 0x6E
#define SMARTRF_SETTING_FS_REG_DIV_CML 0x14
#define SMARTRF_SETTING_FS_SPARE 0xAC
#define SMARTRF_SETTING_FS_VCO0 0xB4
#define SMARTRF_SETTING_XOSC5 0x0E
#define SMARTRF_SETTING_XOSC1 0x03
// Pins
#define CFM_TX_DATA_CLK_PIN 2
#define RESET_PIN 7
#define SS_PIN 10
#define CFM_TX_DATA_CLK 30
#define EXT_CTRL_SETTTING 0x00
#define CFM_DATA_CFG_SETTING 0x01
#define R_BIT 0x80
#define W_BURST_BIT 0x40
// CC1120 registers
#define IOCFG3 0x00
#define IOCFG2 0x01
#define IOCFG1 0x02
#define IOCFG0 0x03
#define SYNC3 0x04
#define SYNC2 0x05
#define SYNC1 0x06
#define SYNC0 0x07
#define SYNC_CFG1 0x08
#define SYNC_CFG0 0x09
#define DEVIATION_M 0x0A
#define MODCFG_DEV_E 0x0B
#define DCFILT_CFG 0x0C
#define PREAMBLE_CFG1 0x0D
#define PREAMBLE_CFG0 0x0E
#define FREQ_IF_CFG 0x0F
#define IQIC 0x10
#define CHAN_BW 0x11
#define MDMCFG1 0x12
#define MDMCFG0 0x13
#define SYMBOL_RATE2 0x02
#define SYMBOL_RATE1 0x9F
#define SYMBOL_RATE0 0x14
#define AGC_REF 0x17
#define AGC_CS_THR 0x18
#define AGC_GAIN_ADJUST 0x19
#define AGC_CFG3 0x1A
#define AGC_CFG2 0x1B
#define AGC_CFG1 0x1C
#define AGC_CFG0 0x1D
#define FIFO_CFG 0x1E
#define DEV_ADDR 0x1F
#define SETTLING_CFG 0x20
#define FS_CFG 0x21
#define WOR_CFG1 0x22
#define WOR_CFG0 0x23
#define WOR_EVENT0_MSB 0x24
#define WOR_EVENT0_LSB 0x25
#define PKT_CFG2 0x26
#define PKT_CFG1 0x27
#define PKT_CFG0 0x28
#define RFEND_CFG1 0x29
#define RFEND_CFG2 0x2A
#define PA_CFG2 0x2B
#define PA_CFG1 0x2C
#define PA_CFG0 0x2D
#define PKT_LEN 0x2E
#define EXT_ADDR 0x2F
#define FIFO 0x3F
// Extended register space
#define IF_MIX_CFG 0x00
#define FREQOFF_CFG 0x01
#define CFM_DATA_CFG 0x05
#define EXT_CTRL 0x06
#define FREQ2 0x0C
#define FREQ1 0x0D
#define FREQ0 0x0E
#define FS_DIG1 0x12
#define FS_DIG0 0x13
#define FS_CAL1 0x16
#define FS_CAL0 0x17
#define FS_DIVTWO 0x19
#define FS_DSM0 0x1B
#define FS_DVC0 0x1D
#define FS_PFD 0x1F
#define FS_PRE 0x20
#define FS_REG_DIV_CML 0x21
#define FS_SPARE 0x22
#define FS_VCO0 0x27
#define XOSC5 0x32
#define XOSC1 0x36
#define RSSI1 0x71
#define RSSI0 0x72
#define MARCSTATE 0x73
#define CFM_RX_DATA_OUT 0x7D
#define CFM_TX_DATA_IN 0x7E
#define PARTNUMBER 0x8F
#define PARTVERSION 0x90
#define SERIAL_STATUS 0x91
#define MODEM_STATUS1 0x92
#define MODEM_STATUS0 0x93
#define MARC_STATUS1 0x94
#define MARC_STATUS0 0x95
#define NUM_RXBYTES 0xD7
#define FIFO_NUM_RXBYTES 0xD9
// CC1120 command strobes
#define SRES 0x30
#define SFSTXON 0x31
#define SXOFF 0x32
#define SCAL 0x33
#define SRX 0x34
#define STX 0x35
#define SIDLE 0x36
#define SAFC 0x37
#define SWOR 0x38
#define SPWD 0x39
#define SFRX 0x3A
#define SFTX 0x3B
#define SWORRST 0x3C
#define SNOP 0x3D
#endif // CC1120_H
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