rx example
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aanper
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@ -2,37 +2,11 @@
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#include "cc1101-workaround/cc1101.h"
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#define MIN_DBM -120
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#define STEP_DBM 10
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#define RSSI_DELAY 600 //rssi delay in micro second
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#define RSSI_THRESHOLD -60
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#define START_SUB_BAND 3
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#define STOP_SUB_BAND 3
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#define RSSI_DELAY 5000 //rssi delay in micro second
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#define NUM_OF_SUB_BANDS 7
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#define CAL_INT 20 // cal every 10 channels(every 1MHz)
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// variables used to calculate rssi
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uint8_t rssi_dec;
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int16_t rssi_dBm;
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uint8_t rssi_offset[NUM_OF_SUB_BANDS] = {74, 74, 74, 74, 74, 74, 74};
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#define CHAN_SPA 0.05 // channel spacing
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// no change in TEST0 WHERE (>430.5MHz) one should change from TEST0=0x0B to 0x09
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uint16_t limitTest0Reg[NUM_OF_SUB_BANDS] = {256, 256, 256, 103, 0, 0, 0};
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/* setting to use 50khz channel spacing whole band*****************************************/
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int16_t rssiTable[256];
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uint16_t channelNumber[256];
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// counter used to keep track on how many CS has been asserted
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uint8_t carrierSenseCounter = 0;
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int16_t calRSSI(uint8_t rssi_dec, uint8_t rssiOffset) {
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int16_t rssi_to_dbm(uint8_t rssi_dec, uint8_t rssiOffset) {
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int16_t rssi;
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if(rssi_dec >= 128) {
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@ -44,131 +18,12 @@ int16_t calRSSI(uint8_t rssi_dec, uint8_t rssiOffset) {
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return rssi;
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}
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/*
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void scanFreq(CC1101* cc1101) {
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uint8_t calCounter; // to determine when to calibrate
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uint8_t subBand;
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uint16_t channel;
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uint16_t i;
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float freq;
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cc1101->SpiWriteReg(CC1101_MCSM0, 0x08); // disalbe FS_AUTOCAL
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cc1101->SpiWriteReg(CC1101_AGCCTRL2, 0x43 | 0x0C); // MAX_DVGA_GAIN to 11 for fast rssi
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cc1101->SpiWriteReg(CC1101_AGCCTRL0, 0xB0); // max AGC WAIT_TIME; 0 filter_length
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cc1101->SetMod(GFSK); // set to GFSK for fast rssi measurement | +8 is dcfilter off
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// 1) loop through all sub bands
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for(subBand = START_SUB_BAND; subBand < STOP_SUB_BAND + 1; subBand++) {
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// 1.1) set subBands freq by FREQ2, FREQ1, FREQ0
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cc1101->SetFreq(
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freqSettings[subBand][0], freqSettings[subBand][1], freqSettings[subBand][2]);
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// 1.2) set TEST0--maybe!
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// 1.3) reset calibration counter
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calCounter = 0;
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// 1.4) loop throuhg all channels
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for(channel = firstChannel[subBand]; channel <= lastChannel[subBand]; channel++) {
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uint8_t pktStatus;
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// 1.4.1) set channel register
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cc1101->SetChannel(channel);
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// 1.4.2) set TEST0
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if(channel == limitTest0Reg[subBand]) {
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//set test0 to 0x09
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cc1101->SpiWriteReg(CC1101_TEST0, 0x09);
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//set FSCAL2 to 0x2A to force VCO HIGH
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cc1101->SpiWriteReg(CC1101_FSCAL2, 0x2A);
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//clear calCounter to invoke mannual calibration
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calCounter = 0;
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}
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// 1.4.3) calibrate every 1MHz
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if(calCounter++ == 0) {
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// perform a manual calibration by issuing SCAL command
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cc1101->SpiStrobe(CC1101_SCAL);
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}
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// 1.4.4) reset calCounter when 1MHz reached
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if(calCounter == CAL_INT) {
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calCounter = 0;
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}
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// 1.4.5-6 enter rx mode
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cc1101->SetReceive();
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// 1.4.7 wait for RSSI to be valid: less than 1.5ms
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delayMicroseconds(RSSI_DELAY);
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// 1.4.8) read PKTSTATUS register while the radio is in RX state
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pktStatus = cc1101->SpiReadStatus(CC1101_PKTSTATUS);
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// 1.4.9) enter IDLE state by issuing a SIDLE command
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cc1101->SpiStrobe(CC1101_SIDLE);
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// 1.4.10) check if CS is assearted
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// //read rssi value and converto to dBm form
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rssi_dec = (uint8_t)cc1101->SpiReadStatus(CC1101_RSSI);
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rssi_dBm = calRSSI(rssi_dec, rssi_offset[subBand]);
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// rssiData[subBand][channel]=rssi_dBm;
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if(pktStatus & 0x40) { //CS assearted
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// store rssi value and corresponding channel number
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rssiTable[carrierSenseCounter] = rssi_dBm;
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channelNumber[carrierSenseCounter] = channel;
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carrierSenseCounter++;
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}
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#ifdef CC1101_DEBUG
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printf("rssi_dBm: %d\n", rssi_dBm);
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#endif
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} // end channel lop
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// 1.5)before moving to next sub band,
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// scan through rssiTable to find highest rssi value
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for(i = 0; i < carrierSenseCounter; i++) {
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if(rssiTable[i] > highRSSI[subBand]) {
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highRSSI[subBand] = rssiTable[i];
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selectedChannel[subBand] = channelNumber[i];
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}
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}
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// printf("subBand:------------------>");
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// Serial.println(subBand);
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// Serial.print("selectedChannel:");
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// Serial.println(selectedChannel[subBand]);
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// Serial.print("highRSSI:");
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// Serial.println(highRSSI[subBand]);
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// 1.6) reset carrierSenseCounter
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carrierSenseCounter = 0;
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} // end band loop
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// 2) when all sub bands has been scanned , find best subband and channel
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int16_t tempRssi = MIN_DBM;
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for(subBand = 0; subBand < NUM_OF_SUB_BANDS; subBand++) {
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if(highRSSI[subBand] > tempRssi) {
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tempRssi = highRSSI[subBand];
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activeChannel = selectedChannel[subBand];
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activeBand = subBand;
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}
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}
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// printf("activeBand:**********> %d, activeChannel %d,\n", activeBand, activeChannel);
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cc1101->SpiWriteReg(CC1101_MCSM0, 0x18); //enable FS_AUTOCAL
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cc1101->SpiWriteReg(CC1101_AGCCTRL2, 0x43); //back to recommended config
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cc1101->SpiWriteReg(CC1101_AGCCTRL0, 0x91); //back to recommended config
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}
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void tx(CC1101* cc1101, uint8_t band, uint16_t channel, uint16_t miniSec) {
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cc1101->SetFreq(freqSettings[band][0], freqSettings[band][1], freqSettings[band][2]);
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cc1101->SetChannel(channel);
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// digitalWrite(19,0);
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cc1101->SetTransmit();
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delay(miniSec);
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cc1101->SpiStrobe(CC1101_SIDLE);
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}
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*/
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typedef struct {
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float base_freq;
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uint8_t settings[3]; // FREQ2, FREQ1, FREQ0
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uint8_t reg[3]; // FREQ2, FREQ1, FREQ0
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uint8_t first_channel;
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uint8_t last_channel;
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uint8_t rssi_offset;
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} Band;
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typedef struct {
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@ -176,14 +31,65 @@ typedef struct {
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uint16_t channel;
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} FreqConfig;
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void setup_freq(CC1101* cc1101, FreqConfig* config) {
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cc1101->SpiWriteReg(CC1101_MCSM0, 0x08); // disalbe FS_AUTOCAL
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cc1101->SpiWriteReg(CC1101_AGCCTRL2, 0x43 | 0x0C); // MAX_DVGA_GAIN to 11 for fast rssi
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cc1101->SpiWriteReg(CC1101_AGCCTRL0, 0xB0); // max AGC WAIT_TIME; 0 filter_length
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cc1101->SetMod(GFSK); // set to GFSK for fast rssi measurement | +8 is dcfilter off
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cc1101->SetFreq(config->band->reg[0], config->band->reg[1], config->band->reg[2]);
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cc1101->SetChannel(config->channel);
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//set test0 to 0x09
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cc1101->SpiWriteReg(CC1101_TEST0, 0x09);
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//set FSCAL2 to 0x2A to force VCO HIGH
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cc1101->SpiWriteReg(CC1101_FSCAL2, 0x2A);
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// perform a manual calibration by issuing SCAL command
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cc1101->SpiStrobe(CC1101_SCAL);
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/*
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// Cleanup:
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cc1101->SpiWriteReg(CC1101_MCSM0, 0x18); //enable FS_AUTOCAL
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cc1101->SpiWriteReg(CC1101_AGCCTRL2, 0x43); //back to recommended config
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cc1101->SpiWriteReg(CC1101_AGCCTRL0, 0x91); //back to recommended config
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*/
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}
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int16_t rx_rssi(CC1101* cc1101, FreqConfig* config) {
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cc1101->SetReceive();
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delayMicroseconds(RSSI_DELAY);
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// 1.4.8) read PKTSTATUS register while the radio is in RX state
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uint8_t _pkt_status = cc1101->SpiReadStatus(CC1101_PKTSTATUS);
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// 1.4.9) enter IDLE state by issuing a SIDLE command
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cc1101->SpiStrobe(CC1101_SIDLE);
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// //read rssi value and converto to dBm form
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uint8_t rssi_dec = (uint8_t)cc1101->SpiReadStatus(CC1101_RSSI);
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int16_t rssi_dBm = rssi_to_dbm(rssi_dec, config->band->rssi_offset);
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return rssi_dBm;
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}
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void tx(CC1101* cc1101) {
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cc1101->SetTransmit();
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}
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void idle(CC1101* cc1101) {
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cc1101->SpiStrobe(CC1101_SIDLE);
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}
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Band bands[NUM_OF_SUB_BANDS] = {
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{387, {0x0E, 0xE2, 0x76}, 0, 255},
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{399.8, {0x0F, 0x60, 0x76}, 0, 255},
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{412.6, {0x0F, 0xDE, 0x76}, 0, 255},
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{425.4, {0x10, 0x5C, 0x76}, 160, 180},
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{438.2, {0x10, 0xDA, 0x76}, 0, 255},
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{451, {0x11, 0x58, 0x8F}, 0, 255},
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{463.8, {0x11, 0xD6, 0x8F}, 0, 4},
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{387, {0x0E, 0xE2, 0x76}, 0, 255, 74},
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{399.8, {0x0F, 0x60, 0x76}, 0, 255, 74},
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{412.6, {0x0F, 0xDE, 0x76}, 0, 255, 74},
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{425.4, {0x10, 0x5C, 0x76}, 160, 180, 74},
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{438.2, {0x10, 0xDA, 0x76}, 0, 255, 74},
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{451, {0x11, 0x58, 0x8F}, 0, 255, 74},
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{463.8, {0x11, 0xD6, 0x8F}, 0, 4, 74},
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};
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FreqConfig FREQ_LIST[] = {
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@ -237,6 +143,8 @@ typedef enum {
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typedef struct {
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Mode mode;
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size_t active_freq;
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int16_t last_rssi;
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bool need_cc1101_conf;
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} State;
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static void render_callback(CanvasApi* canvas, void* ctx) {
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@ -257,6 +165,30 @@ static void render_callback(CanvasApi* canvas, void* ctx) {
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canvas->draw_str(canvas, 2, 25, buf);
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}
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{
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canvas->set_font(canvas, FontSecondary);
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if(state->need_cc1101_conf) {
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canvas->draw_str(canvas, 2, 36, "mode: configuring...");
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} else if(state->mode == ModeRx) {
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canvas->draw_str(canvas, 2, 36, "mode: RX");
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} else if(state->mode == ModeTx) {
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canvas->draw_str(canvas, 2, 36, "mode: TX");
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} else {
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canvas->draw_str(canvas, 2, 36, "mode: unknown");
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}
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}
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{
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if(!state->need_cc1101_conf && state->mode == ModeRx) {
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char buf[24];
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sprintf(buf, "RSSI: %d dBm", state->last_rssi);
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canvas->set_font(canvas, FontSecondary);
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canvas->draw_str(canvas, 2, 48, buf);
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}
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}
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release_mutex((ValueMutex*)ctx, state);
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}
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@ -277,6 +209,8 @@ extern "C" void cc1101_workaround(void* p) {
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State _state;
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_state.mode = ModeRx;
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_state.active_freq = 0;
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_state.need_cc1101_conf = true;
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_state.last_rssi = 0;
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ValueMutex state_mutex;
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if(!init_mutex(&state_mutex, &_state, sizeof(State))) {
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@ -318,9 +252,17 @@ extern "C" void cc1101_workaround(void* p) {
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// 50khz channel spacing
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cc1101.SpiWriteReg(CC1101_MDMCFG0, 0xF8);
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// create pin
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GpioPin led = {GPIOA, GPIO_PIN_8};
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// configure pin
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pinMode(led, GpioModeOpenDrain);
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const int16_t RSSI_THRESHOLD = -89;
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Event event;
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while(1) {
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if(osMessageQueueGet(event_queue, &event, NULL, osWaitForever) == osOK) {
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if(osMessageQueueGet(event_queue, &event, NULL, 150) == osOK) {
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State* state = (State*)acquire_mutex_block(&state_mutex);
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if(event.type == EventTypeKey) {
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@ -334,16 +276,43 @@ extern "C" void cc1101_workaround(void* p) {
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if(event.value.input.state && event.value.input.input == InputUp) {
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if(state->active_freq > 0) {
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state->active_freq--;
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state->need_cc1101_conf = true;
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}
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}
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if(event.value.input.state && event.value.input.input == InputDown) {
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if(state->active_freq < (sizeof(FREQ_LIST)/sizeof(FREQ_LIST[0]) - 1)) {
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state->active_freq++;
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state->need_cc1101_conf = true;
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}
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}
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}
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if(state->need_cc1101_conf) {
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setup_freq(&cc1101, &FREQ_LIST[state->active_freq]);
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if(state->mode == ModeRx) {
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state->last_rssi = rx_rssi(&cc1101, &FREQ_LIST[state->active_freq]);
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} else if(state->mode == ModeTx) {
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tx(&cc1101);
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}
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state->need_cc1101_conf = false;
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}
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digitalWrite(led, state->last_rssi > RSSI_THRESHOLD ? LOW : HIGH);
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release_mutex(&state_mutex, state);
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widget_update(widget);
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} else {
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State* state = (State*)acquire_mutex_block(&state_mutex);
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if(!state->need_cc1101_conf && state->mode == ModeRx) {
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state->last_rssi = rx_rssi(&cc1101, &FREQ_LIST[state->active_freq]);
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}
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digitalWrite(led, state->last_rssi > RSSI_THRESHOLD ? LOW : HIGH);
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release_mutex(&state_mutex, state);
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widget_update(widget);
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}
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