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Radio-CC1101.h
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//- -----------------------------------------------------------------------------------------------------------------------
// AskSin driver implementation
// 2013-08-03 <[email protected]> Creative Commons - http://creativecommons.org/licenses/by-nc-sa/3.0/de/
//- -----------------------------------------------------------------------------------------------------------------------
//- AskSin cc1101 functions -----------------------------------------------------------------------------------------------
//- with a lot of copy and paste from culfw firmware
//- -----------------------------------------------------------------------------------------------------------------------
//- -----------------------------------------------------------------------------------------------------------------------
// AskSin++
// 2016-10-31 papa Creative Commons - http://creativecommons.org/licenses/by-nc-sa/3.0/de/
// 2019-03-31 stan23 Creative Commons - http://creativecommons.org/licenses/by-nc-sa/3.0/de/
//- -----------------------------------------------------------------------------------------------------------------------
#ifndef _CC1101_H
#define _CC1101_H
namespace as {
// CC1101 config register // Reset Description
#define CC1101_IOCFG2 0x00 // (0x29) GDO2 Output Pin Configuration
#define CC1101_IOCFG1 0x01 // (0x2E) GDO1 Output Pin Configuration
#define CC1101_IOCFG0 0x02 // (0x3F) GDO0 Output Pin Configuration
#define CC1101_FIFOTHR 0x03 // (0x07) RX FIFO and TX FIFO Thresholds
#define CC1101_SYNC1 0x04 // (0xD3) Sync Word, High Byte
#define CC1101_SYNC0 0x05 // (0x91) Sync Word, Low Byte
#define CC1101_PKTLEN 0x06 // (0xFF) Packet Length
#define CC1101_PKTCTRL1 0x07 // (0x04) Packet Automation Control
#define CC1101_PKTCTRL0 0x08 // (0x45) Packet Automation Control
#define CC1101_ADDR 0x09 // (0x00) Device Address
#define CC1101_CHANNR 0x0A // (0x00) Channel Number
#define CC1101_FSCTRL1 0x0B // (0x0F) Frequency Synthesizer Control
#define CC1101_FSCTRL0 0x0C // (0x00) Frequency Synthesizer Control
#define CC1101_FREQ2 0x0D // (0x1E) Frequency Control Word, High Byte
#define CC1101_FREQ1 0x0E // (0xC4) Frequency Control Word, Middle Byte
#define CC1101_FREQ0 0x0F // (0xEC) Frequency Control Word, Low Byte
#define CC1101_MDMCFG4 0x10 // (0x8C) Modem Configuration
#define CC1101_MDMCFG3 0x11 // (0x22) Modem Configuration
#define CC1101_MDMCFG2 0x12 // (0x02) Modem Configuration
#define CC1101_MDMCFG1 0x13 // (0x22) Modem Configuration
#define CC1101_MDMCFG0 0x14 // (0xF8) Modem Configuration
#define CC1101_DEVIATN 0x15 // (0x47) Modem Deviation Setting
#define CC1101_MCSM2 0x16 // (0x07) Main Radio Control State Machine Configuration
#define CC1101_MCSM1 0x17 // (0x30) Main Radio Control State Machine Configuration
#define CC1101_MCSM0 0x18 // (0x04) Main Radio Control State Machine Configuration
#define CC1101_FOCCFG 0x19 // (0x36) Frequency Offset Compensation Configuration
#define CC1101_BSCFG 0x1A // (0x6C) Bit Synchronization Configuration
#define CC1101_AGCCTRL2 0x1B // (0x03) AGC Control
#define CC1101_AGCCTRL1 0x1C // (0x40) AGC Control
#define CC1101_AGCCTRL0 0x1D // (0x91) AGC Control
#define CC1101_WOREVT1 0x1E // (0x87) High Byte Event0 Timeout
#define CC1101_WOREVT0 0x1F // (0x6B) Low Byte Event0 Timeout
#define CC1101_WORCTRL 0x20 // (0xF8) Wake On Radio Control
#define CC1101_FREND1 0x21 // (0x56) Front End RX Configuration
#define CC1101_FREND0 0x22 // (0x10) Front End RX Configuration
#define CC1101_FSCAL3 0x23 // (0xA9) Frequency Synthesizer Calibration
#define CC1101_FSCAL2 0x24 // (0x0A) Frequency Synthesizer Calibration
#define CC1101_FSCAL1 0x25 // (0x20) Frequency Synthesizer Calibration
#define CC1101_FSCAL0 0x26 // (0x0D) Frequency Synthesizer Calibration
#define CC1101_RCCTRL1 0x27 // (0x41) RC Oscillator Configuration
#define CC1101_RCCTRL2 0x28 // (0x00) RC Oscillator Configuration
#define CC1101_FSTEST 0x29 // (0x59) Frequency Synthesizer Calibration Control
#define CC1101_PTEST 0x2A // (0x7F) Production Test
#define CC1101_AGCTEST 0x2B // (0x3F) AGC Test
#define CC1101_TEST2 0x2C // (0x88) Various Test Settings
#define CC1101_TEST1 0x2D // (0x31) Various Test Settings
#define CC1101_TEST0 0x2E // (0x0B) Various Test Settings
#define CC1101_PARTNUM 0x30 // (0x00) Readonly: Chip ID
#define CC1101_VERSION 0x31 // (0x04) Readonly: Chip ID
#define CC1101_FREQEST 0x32 // (0x00) Readonly: Frequency Offset Estimate from Demodulator
#define CC1101_LQI 0x33 // (0x00) Readonly: Demodulator Estimate for Link Quality
#define CC1101_RSSI 0x34 // (0x00) Readonly: Received Signal Strength Indication
#define CC1101_MARCSTATE 0x35 // (0x00) Readonly: Main Radio Control State Machine State
#define CC1101_WORTIME1 0x36 // (0x00) Readonly: High Byte of WOR Time
#define CC1101_WORTIME0 0x37 // (0x00) Readonly: Low Byte of WOR Time
#define CC1101_PKTSTATUS 0x38 // (0x00) Readonly: Current GDOx Status and Packet Status
#define CC1101_VCO_VC_DAC 0x39 // (0x00) Readonly: Current Setting from PLL Calibration Module
#define CC1101_TXBYTES 0x3A // (0x00) Readonly: Underflow and Number of Bytes
#define CC1101_RXBYTES 0x3B // (0x00) Readonly: Overflow and Number of Bytes
#define CC1101_RCCTRL1_STATUS 0x3C // (0x00) Readonly: Last RC Oscillator Calibration Result
#define CC1101_RCCTRL0_STATUS 0x3D // (0x00) Readonly: Last RC Oscillator Calibration Result
#define CC1101_PATABLE 0x3E // PATABLE address
#define CC1101_TXFIFO 0x3F // TX FIFO address
#define CC1101_RXFIFO 0x3F // RX FIFO address
#define CC1101_PA_TABLE0 0x40 // (0x00) PA table, entry 0
#define CC1101_PA_TABLE1 0x41 // (0x00) PA table, entry 1
#define CC1101_PA_TABLE2 0x42 // (0x00) PA table, entry 2
#define CC1101_PA_TABLE3 0x43 // (0x00) PA table, entry 3
#define CC1101_PA_TABLE4 0x44 // (0x00) PA table, entry 4
#define CC1101_PA_TABLE5 0x45 // (0x00) PA table, entry 5
#define CC1101_PA_TABLE6 0x46 // (0x00) PA table, entry 6
#define CC1101_PA_TABLE7 0x47 // (0x00) PA table, entry 7
// some register definitions for TRX868 communication
#define READ_SINGLE 0x80 // type of transfers
#define READ_BURST 0xC0
#define WRITE_BURST 0x40
#define CC1101_CONFIG 0x80 // type of register
#define CC1101_STATUS 0xC0
#define CC1101_SRES 0x30 // reset CC1101 chip
#define CC1101_SFSTXON 0x31 // enable and calibrate frequency synthesizer (if MCSM0.FS_AUTOCAL=1). if in RX (with CCA): Go to a wait state where only the synthesizer is running (for quick RX / TX turnaround).
#define CC1101_SXOFF 0x32 // turn off crystal oscillator
#define CC1101_SCAL 0x33 // calibrate frequency synthesizer and turn it off. SCAL can be strobed from IDLE mode without setting manual calibration mode (MCSM0.FS_AUTOCAL=0)
#define CC1101_SRX 0x34 // enable RX. perform calibration first if coming from IDLE and MCSM0.FS_AUTOCAL=1
#define CC1101_STX 0x35 // in IDLE state: enable TX. perform calibration first if MCSM0.FS_AUTOCAL=1. if in RX state and CCA is enabled: only go to TX if channel is clear
#define CC1101_SIDLE 0x36 // exit RX / TX, turn off frequency synthesizer and exit Wake-On-Radio mode if applicable
#define CC1101_SWOR 0x38 // start automatic RX polling sequence (Wake-on-Radio) as described in Section 19.5 if WORCTRL.RC_PD=0
#define CC1101_SPWD 0x39 // enter power down mode when CSn goes high
#define CC1101_SFRX 0x3A // flush the RX FIFO buffer. only issue SFRX in IDLE or RXFIFO_OVERFLOW states
#define CC1101_SFTX 0x3B // flush the TX FIFO buffer. only issue SFTX in IDLE or TXFIFO_UNDERFLOW states
#define CC1101_SWORRST 0x3C // reset real time clock to Event1 value
#define CC1101_SNOP 0x3D // no operation. may be used to get access to the chip status byte
#define MARCSTATE_SLEEP 0x00
#define MARCSTATE_IDLE 0x01
#define MARCSTATE_XOFF 0x02
#define MARCSTATE_VCOON_MC 0x03
#define MARCSTATE_REGON_MC 0x04
#define MARCSTATE_MANCAL 0x05
#define MARCSTATE_VCOON 0x06
#define MARCSTATE_REGON 0x07
#define MARCSTATE_STARTCAL 0x08
#define MARCSTATE_BWBOOST 0x09
#define MARCSTATE_FS_LOCK 0x0A
#define MARCSTATE_IFADCON 0x0B
#define MARCSTATE_ENDCAL 0x0C
#define MARCSTATE_RX 0x0D
#define MARCSTATE_RX_END 0x0E
#define MARCSTATE_RX_RST 0x0F
#define MARCSTATE_TXRX_SWITCH 0x10
#define MARCSTATE_RXFIFO_OFLOW 0x11
#define MARCSTATE_FSTXON 0x12
#define MARCSTATE_TX 0x13
#define MARCSTATE_TX_END 0x14
#define MARCSTATE_RXTX_SWITCH 0x15
#define MARCSTATE_TXFIFO_UFLOW 0x16
#define PA_LowPower 0x03 // PATABLE values
#define PA_Normal 0x50 // PATABLE values
#define PA_MaxPower 0xC0
template <class SPIType, uint8_t PWRPIN>
class CC1101 {
protected:
SPIType spi;
uint8_t rss; // signal strength
#ifdef USE_OTA_BOOTLOADER_FREQUENCY
uint8_t f1,f0; // storage for frequency values from boot loader
#endif
public:
CC1101() : rss(0)
#ifdef USE_OTA_BOOTLOADER_FREQUENCY
, f1(0x65), f0(0x6A) // set to defaults
#endif
{}
uint8_t interruptMode() {
return 0; // FALLING
};
void setIdle () {
//DPRINTLN("CC enter powerdown");
uint8_t cnt = 0xff;
while(cnt-- && (spi.strobe(CC1101_SIDLE) & 0x70) != 0) {
_delay_us(10);
}
spi.strobe(CC1101_SFRX);
#ifdef USE_WOR
// init
spi.writeReg(CC1101_PKTCTRL1, 0x4C); // preamble quality estimator threshold=2
spi.writeReg(CC1101_MCSM2, 0x1c); // RX_TIME_RSSI=1, RX_TIME_QUAL=1, RX_TIME=4
//start
spi.strobe(CC1101_SWORRST);
spi.strobe(CC1101_SWOR);
#else
spi.strobe(CC1101_SPWD); // enter power down state
#endif
if (PWRPIN < 0xff) {
spi.shutdown();
digitalWrite(PWRPIN, HIGH);
}
}
void wakeup (bool flush) {
if (PWRPIN < 0xff) {
init();
}
spi.ping();
if( flush==true ) {
flushrx();
}
#ifdef USE_WOR
// ToDo: is this the right position?
spi.writeReg(CC1101_PKTCTRL1, 0x0C); // preamble quality estimator threshold=0
spi.writeReg(CC1101_MCSM2, 0x07); // RX_TIME_RSSI=0, RX_TIME_QUAL=0, RX_TIME=7
#endif
spi.strobe(CC1101_SRX);
}
uint8_t reset() {
// Strobe CSn low / high
spi.select();
// Automatic POR
// If the chip has had sufficient time for the crystal oscillator to stabilize after the power-on-reset the SO pin
// will go low immediately after taking CSn low. If CSn is taken low before reset is completed the
// SO pin will first go high, indicating that the crystal oscillator is not stabilized, before going low
spi.waitMiso();
spi.deselect();
// Hold CSn high for at least 40μs relative to pulling CSn low
_delay_us(50);
// Pull CSn low and wait for SO to go low (CHIP_RDYn).
spi.select();
spi.waitMiso();
// Issue the SRES strobe on the SI line
uint8_t ret = spi.send(CC1101_SRES);
// When SO goes low again, reset is complete and the chip is in the IDLE state.
spi.waitMiso();
spi.deselect();
return ret;
}
bool init () {
if (PWRPIN < 0xff) {
pinMode(PWRPIN, OUTPUT);
digitalWrite(PWRPIN, LOW);
_delay_ms(5);
}
spi.init(); // init the hardware to get access to the RF modul
#ifdef USE_OTA_BOOTLOADER_FREQUENCY
// before we reset the CC1101 - store frequency settings from bootloader
f1 = spi.readReg(CC1101_FREQ1, CC1101_CONFIG);
f0 = spi.readReg(CC1101_FREQ0, CC1101_CONFIG);
DPRINT(F("Boot Loader Freq: 0x21"));DHEX(f1);DHEXLN(f0);
#endif
reset();
#ifdef SIMPLE_CC1101_INIT
static const uint8_t initVal[] PROGMEM = {
/* register value reset explanation of delta to reset value */
/* CC1101_IOCFG2 */ 0x2E, // 0x29 high impedance tri state (pin not used)
/* CC1101_IOCFG1 */ 0x2E, // 0x2E high impedance tri state (pin not used)
/* CC1101_IOCFG0,*/ 0x06, // 0x3F Asserts when sync word has been sent / received, and de-asserts at the end of the packet. In RX, the pin will also deassert when a packet is discarded due to address or maximum length filtering or when the radio enters RXFIFO_OVERFLOW state. In TX the pin will de-assert if the TX FIFO underflows.
/* CC1101_FIFOTHR,*/ 0x0D, // 0x07 TX FIFO = 9, RX FIFO = 56 byte
/* CC1101_SYNC1, */ 0xE9, // 0xD3 Sync word MSB
/* CC1101_SYNC0, */ 0xCA, // 0x91 Sync word LSB
/* CC1101_PKTLEN,*/ 0xFF, // 0xFF
/* CC1101_PKTCTRL1,*/0x0C, // 0x04 CRC auto flush = 1, append status = 1,
/* CC1101_PKTCTRL0,*/0x45, // 0x45
/* CC1101_ADDR, */ 0x00, // 0x00
/* CC1101_CHANNR,*/ 0x00, // 0x00
/* CC1101_FSCTRL1,*/ 0x06, // 0x0F frequency synthesizer control
/* CC1101_FSCTRL0,*/ 0x00, // 0x00
/* CC1101_FREQ2, */ 0x21, // 0x1E
/* CC1101_FREQ1, */ 0x65, // 0xC4
/* CC1101_FREQ0, */ 0x6A, // 0xEC
/* CC1101_MDMCFG4,*/ 0xC8, // 0x8C channel bandwidth
/* CC1101_MDMCFG3,*/ 0x93, // 0x22 symbol data rate
/* CC1101_MDMCFG2,*/ 0x03, // 0x02 30 of 32 bits of sync word need to match
/* CC1101_MDMCFG1,*/ 0x22, // 0x22
/* CC1101_MDMCFG0,*/ 0xF8, // 0xF8
/* CC1101_DEVIATN,*/ 0x34, // 0x47 deviation = 19.042969 kHz
/* CC1101_MCSM2, */ 0x07, // 0x07
#ifdef USE_CCA
/* CC1101_MCSM1,*/ 0x33, // 0x30 CCA, RX after TX
#else
/* CC1101_MCSM1,*/ 0x03, // 0x30 always clear channel indication, RX after TX
#endif
/* CC1101_MCSM0,*/ 0x18, // 0x04 auto cal when going from IDLE to RX/TX, XOSC stable count = 64
/* CC1101_FOCCFG,*/ 0x16, // 0x36 don't freeze freq offset compensation
/* CC1101_BSCFG,*/ 0x6C, // 0x6C
/* CC1101_AGCCTRL2,*/0x43, // 0x03 forbid highest gain setting for DVGA
/* CC1101_AGCCTRL1,*/0x40, // 0x40
/* CC1101_AGCCTRL0,*/0x91, // 0x91
/* CC1101_WOREVT1,*/ 0x2f, // 0x87 see next line
/* CC1101_WOREVT0,*/ 0x65, // 0x6B t_Event0 = 350ms
/* CC1101_WORCTRL,*/ 0x78, // 0xF8 RC_PD=0
/* CC1101_FREND1,*/ 0x56, // 0x56
/* CC1101_FREND0,*/ 0x10, // 0x10
/* CC1101_FSCAL3,*/ 0xE9, // 0xA9 charge pump calib stage
/* CC1101_FSCAL2,*/ 0x2A, // 0x0A high VCO
/* CC1101_FSCAL1,*/ 0x1F, // 0x20 freq synthesizer calib result
/* CC1101_FSCAL0,*/ 0x11, // 0x0D freq synthesizer calib control
//CC1101_RCCTRL1, 0x41, // 0x41
//CC1101_RCCTRL0, 0x00, // 0x00
//CC1101_FSTEST, 0x59, // 0x59
//CC1101_PTEST, 0x7f, // 0x7f
//CC1101_AGCTEST, 0x3f, // 0x3f
//CC1101_TEST2, 0x88, // 0x88
//CC1101_TEST1, 0x31, // 0x31
//CC1101_TEST0, 0x0b, // 0x0b
// CC1101_PATABLE, 0x03, // NA
};
bool initOK = true;
for (uint8_t i=0; i<sizeof(initVal); ++i) { // write init value to TRX868
bool initres = initReg(i, pgm_read_byte(&initVal[i]));
//if any initReg fails, initOK has to be false
if (initres == false) initOK = false;
}
#else
// define init settings for CC1101
static const uint8_t initVal[] PROGMEM = {
/*register value reset explanation of delta to reset value */
CC1101_IOCFG2, 0x2E, // 0x29 high impedance tri state (pin not used)
//CC1101_IOCFG2, 0x24, // 0x29 Debug: WOR_EVT0
//CC1101_IOCFG1, 0x2E, // 0x2E high impedance tri state (pin not used)
//CC1101_IOCFG1, 0x25, // 0x2E Debug: WOR_EVT1
//CC1101_IOCFG1, 0x0E, // 0x2E Debug: Carrier sense
//CC1101_IOCFG1, 0x0F, // 0x2E Debug: CRC_OK
CC1101_IOCFG0, 0x06, // 0x3F Asserts when sync word has been sent / received, and de-asserts at the end of the packet. In RX, the pin will also deassert when a packet is discarded due to address or maximum length filtering or when the radio enters RXFIFO_OVERFLOW state. In TX the pin will de-assert if the TX FIFO underflows.
CC1101_FIFOTHR, 0x0D, // 0x07 TX FIFO = 9, RX FIFO = 56 byte
CC1101_SYNC1, 0xE9, // 0xD3 Sync word MSB
CC1101_SYNC0, 0xCA, // 0x91 Sync word LSB
//CC1101_PKTLEN, 0xFF, // 0xFF
CC1101_PKTCTRL1, 0x0C, // 0x04 CRC auto flush = 1, append status = 1,
//CC1101_PKTCTRL0, 0x45, // 0x45
//CC1101_ADDR, 0x00, // 0x00
//CC1101_CHANNR, 0x00, // 0x00
CC1101_FSCTRL1, 0x06, // 0x0F frequency synthesizer control
//CC1101_FSCTRL0, 0x00, // 0x00
#ifndef USE_OTA_BOOTLOADER_FREQUENCY
// 868.299866 MHz - if other values are found in EEPROM, these are overwritten later
CC1101_FREQ2, 0x21, // 0x1E
CC1101_FREQ1, 0x65, // 0xC4
CC1101_FREQ0, 0x6A, // 0xEC
#endif
CC1101_MDMCFG4, 0xC8, // 0x8C channel bandwidth
CC1101_MDMCFG3, 0x93, // 0x22 symbol data rate
CC1101_MDMCFG2, 0x03, // 0x02 30 of 32 bits of sync word need to match
//CC1101_MDMCFG1, 0x22, // 0x22
//CC1101_MDMCFG0, 0xF8, // 0xF8
CC1101_DEVIATN, 0x34, // 0x47 deviation = 19.042969 kHz
//CC1101_MCSM2, 0x07, // 0x07
#ifdef USE_CCA
CC1101_MCSM1, 0x33, // 0x30 CCA, RX after TX
#else
CC1101_MCSM1, 0x03, // 0x30 always clear channel indication, RX after TX
#endif
CC1101_MCSM0, 0x18, // 0x04 auto cal when going from IDLE to RX/TX, XOSC stable count = 64
CC1101_FOCCFG, 0x16, // 0x36 don't freeze freq offset compensation
//CC1101_BSCFG, 0x6C, // 0x6C
CC1101_AGCCTRL2, 0x43, // 0x03 forbid highest gain setting for DVGA
//CC1101_AGCCTRL1, 0x40, // 0x40
//CC1101_AGCCTRL0, 0x91, // 0x91
CC1101_WOREVT1, 0x2f, // 0x87 see next line
CC1101_WOREVT0, 0x65, // 0x6B t_Event0 = 350ms
CC1101_WORCTRL, 0x78, // 0xF8 RC_PD=0
//CC1101_FREND1, 0x56, // 0x56
//CC1101_FREND0, 0x10, // 0x10
CC1101_FSCAL3, 0xE9, // 0xA9 charge pump calib stage
CC1101_FSCAL2, 0x2A, // 0x0A high VCO
CC1101_FSCAL1, 0x1F, // 0x20 freq synthesizer calib result
CC1101_FSCAL0, 0x11, // 0x0D freq synthesizer calib control
//CC1101_RCCTRL1, 0x41, // 0x41
//CC1101_RCCTRL0, 0x00, // 0x00
//CC1101_FSTEST, 0x59, // 0x59
//CC1101_PTEST, 0x7f, // 0x7f
//CC1101_AGCTEST, 0x3f, // 0x3f
//CC1101_TEST2, 0x88, // 0x88
//CC1101_TEST1, 0x31, // 0x31
//CC1101_TEST0, 0x0b, // 0x0b
CC1101_PATABLE, 0x03, // NA
};
bool initOK = true;
for (uint8_t i=0; i<sizeof(initVal); i+=2) { // write init value to TRX868
bool initres = initReg(pgm_read_byte(&initVal[i]), pgm_read_byte(&initVal[i+1]));
//if any initReg fails, initOK has to be false
if (initres == false) initOK = false;
}
#endif
#ifdef USE_OTA_BOOTLOADER_FREQUENCY
// set frequency from bootloader again
initReg(CC1101_FREQ2, 0x21);
initReg(CC1101_FREQ1, f1);
initReg(CC1101_FREQ0, f0);
#endif
// Settings that ELV sets
DPRINT(F("CC Version: ")); DHEXLN(spi.readReg(CC1101_VERSION, CC1101_STATUS));
spi.strobe(CC1101_SCAL); // calibrate frequency synthesizer and turn it off
_delay_ms(23);
initReg(CC1101_PATABLE, PA_MaxPower); // configure PATABLE
DPRINTLN(F(" - ready"));
return initOK;
}
#ifdef SIMPLE_CC1101_INIT
bool initReg (uint8_t regAddr, uint8_t val) {
spi.writeReg(regAddr, val);
return true;
}
#else
bool initReg (uint8_t regAddr, uint8_t val, uint8_t retries=3) {
spi.writeReg(regAddr, val);
uint8_t val_read = spi.readReg(regAddr, CC1101_CONFIG);
bool initResult = true;
if( val_read != val ) {
if( retries > 0 ) {
initResult = initReg(regAddr, val, --retries);
_delay_ms(1);
}
else {
DPRINT(F("Error at ")); DHEX(regAddr);
DPRINT(F(" expected: ")); DHEX(val); DPRINT(F(" read: ")); DHEXLN(val_read);
return false;
}
}
return initResult;
}
#endif
void tuneFreq(uint8_t freq2, uint8_t freq1, uint8_t freq0) {
initReg(CC1101_FREQ2, freq2);
initReg(CC1101_FREQ1, freq1);
initReg(CC1101_FREQ0, freq0);
}
uint8_t rssi () const {
return rss;
}
void flushrx () {
spi.strobe(CC1101_SIDLE);
spi.strobe(CC1101_SNOP);
spi.strobe(CC1101_SFRX);
}
bool detectBurst () {
uint8_t state = spi.readReg(CC1101_PKTSTATUS, CC1101_STATUS);
// DHEXLN(state);
return (state & 0x01<<6) == (0x01<<6);
}
void pollRSSI() {
calculateRSSI(spi.readReg(CC1101_RSSI, CC1101_STATUS)); // read RSSI from STATUS register
}
protected:
void calculateRSSI(uint8_t rsshex) {
rss = -1 * ((((int16_t)rsshex-((int16_t)rsshex >= 128 ? 256 : 0))/2)-74);
}
uint8_t sndData(uint8_t *buf, uint8_t size, uint8_t burst) {
// Going from RX to TX does not work if there was a reception less than 0.5
// sec ago. Due to CCA? Using IDLE helps to shorten this period(?)
spi.strobe(CC1101_SIDLE); // go to idle mode
spi.strobe(CC1101_SFTX ); // flush TX buffer
// switch to TX and wait till status has changed, will take approx 1ms
spi.strobe(CC1101_STX);
uint8_t i = 200;
while ((spi.readReg(CC1101_MARCSTATE, CC1101_STATUS) != MARCSTATE_TX) && (--i != 0)) {
_delay_us(100);
}
// if switch to TX mode timed out - reset fifo and back to RX mode
if (i == 0) {
spi.strobe(CC1101_SIDLE);
spi.strobe(CC1101_SFTX);
spi.strobe(CC1101_SNOP);
spi.strobe(CC1101_SRX);
waitRX();
return false;
}
// send burst signal for sleeping devices if necessary
_delay_ms(10);
if (burst) { // BURST-bit set?
_delay_ms(350); // according to ELV, devices get activated every 300ms, so send burst for 360ms
}
// write bytes into cc1101 TX queue
spi.writeReg(CC1101_TXFIFO, size);
spi.writeBurst(CC1101_TXFIFO | WRITE_BURST, buf, size); // write in TX FIFO
// after sending out all bytes the chip should go automatically in RX mode, we wait for RX mode to ensure a proper handling
return waitRX();
}
uint8_t waitRX() {
uint8_t i = 200;
while ((spi.readReg(CC1101_MARCSTATE, CC1101_STATUS) != MARCSTATE_RX) && (--i != 0)) {
_delay_us(200);
}
return i ? true : false;
}
uint8_t rcvData(uint8_t *buf, uint8_t size) {
//DPRINTLN(" rcvData");
uint8_t rxBytes = 0;
uint8_t fifoBytes = spi.readReg(CC1101_RXBYTES, CC1101_STATUS); // how many bytes are in the buffer
//DPRINT(" RX FIFO: ");DHEXLN(fifoBytes);
// overflow detected - flush the FIFO
if( fifoBytes > 0 && (fifoBytes & 0x80) != 0x80 ) {
uint8_t packetBytes = spi.readReg(CC1101_RXFIFO, CC1101_CONFIG); // read packet length
//DPRINT(" Start Packet: ");DHEXLN(packetBytes);
// check that packet fits into the buffer
if (packetBytes <= size) {
spi.readBurst(buf, CC1101_RXFIFO | READ_BURST, packetBytes); // read data packet
calculateRSSI(spi.readReg(CC1101_RXFIFO, CC1101_CONFIG)); // read RSSI from RXFIFO
uint8_t val = spi.readReg(CC1101_RXFIFO, CC1101_CONFIG); // read LQI and CRC_OK
// lqi = val & 0x7F;
if( (val & 0x80) == 0x80 ) { // check crc_ok
// DPRINTLN("CRC OK");
rxBytes = packetBytes;
}
else {
DPRINTLN(F("CRC Failed"));
}
}
else {
DPRINT(F("Packet too big: ")); DDECLN(packetBytes);
}
}
//DPRINT(F("-> ")); DHEXLN(buf,rxBytes);
// cc1101 is configured to enter idle mode after receiving a message; go back in receive mode
flushrx();
spi.strobe(CC1101_SRX);
//DHEXLN(spi.readReg(CC1101_MARCSTATE, CC1101_STATUS));
return rxBytes; // return number of byte in buffer
}
void recalibrate() {
uint8_t fscal1val = spi.readReg(CC1101_FSCAL1, CC1101_CONFIG);
if (fscal1val == 0x3F) {
DPRINT(F("\nforce calibration - ")); DPRINTLN(millis()); DPRINT('\n');
spi.strobe(CC1101_SIDLE);
spi.strobe(CC1101_SCAL);
spi.strobe(CC1101_SRX);
}
}
};
}
#endif