src/main/rx/cc2500_common.c

   1 /*
   2  * This file is part of Cleanflight and Betaflight.
   3  *
   4  * Cleanflight and Betaflight are free software. You can redistribute
   5  * this software and/or modify this software under the terms of the
   6  * GNU General Public License as published by the Free Software
   7  * Foundation, either version 3 of the License, or (at your option)
   8  * any later version.
   9  *
  10  * Cleanflight and Betaflight are distributed in the hope that they
  11  * will be useful, but WITHOUT ANY WARRANTY; without even the implied
  12  * warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
  13  * See the GNU General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU General Public License
  16  * along with this software.
  17  *
  18  * If not, see <http://www.gnu.org/licenses/>.
  19  */
  20
  21 #include <stdbool.h>
  22
  23 #include "platform.h"
  24
  25 #if defined(USE_RX_FRSKY_SPI) || defined(USE_RX_SFHSS_SPI)
  26
  27 #include "common/maths.h"
  28
  29 #include "drivers/io.h"
  30 #include "drivers/rx/rx_cc2500.h"
  31 #include "drivers/rx/rx_spi.h"
  32 #include "drivers/time.h"
  33
  34 #include "config/config.h"
  35
  36 #include "pg/pg.h"
  37 #include "pg/pg_ids.h"
  38 #include "pg/rx.h"
  39 #include "pg/rx_spi.h"
  40 #include "pg/rx_spi_cc2500.h"
  41
  42 #include "rx/rx.h"
  43 #include "rx/rx_spi.h"
  44
  45 #include "cc2500_common.h"
  46
  47 #if defined(USE_RX_CC2500_SPI_PA_LNA)
  48 static IO_t txEnPin;
  49 static IO_t rxLnaEnPin;
  50 #if defined(USE_RX_CC2500_SPI_DIVERSITY)
  51 static IO_t antSelPin;
  52 #endif
  53 #endif
  54
  55 static int16_t rssiDbm;
  56
  57 uint16_t cc2500getRssiDbm(void)
  58 {
  59     return rssiDbm;
  60 }
  61
  62 void cc2500setRssiDbm(uint8_t value)
  63 {
  64     if (value >= 128) {
  65         rssiDbm = ((((uint16_t)value) * 18) >> 5) - 82;
  66     } else {
  67         rssiDbm = ((((uint16_t)value) * 18) >> 5) + 65;
  68     }
  69
  70     setRssi(rssiDbm << 3, RSSI_SOURCE_RX_PROTOCOL);
  71 }
  72
  73 #if defined(USE_RX_CC2500_SPI_PA_LNA) && defined(USE_RX_CC2500_SPI_DIVERSITY)
  74 void cc2500switchAntennae(void)
  75 {
  76     static bool alternativeAntennaSelected = true;
  77
  78     if (antSelPin) {
  79         if (alternativeAntennaSelected) {
  80             IOLo(antSelPin);
  81         } else {
  82             IOHi(antSelPin);
  83         }
  84         alternativeAntennaSelected = !alternativeAntennaSelected;
  85     }
  86 }
  87 #endif
  88 #if defined(USE_RX_CC2500_SPI_PA_LNA)
  89 void cc2500TxEnable(void)
  90 {
  91     if (txEnPin) {
  92         IOHi(txEnPin);
  93     }
  94 }
  95
  96 void cc2500TxDisable(void)
  97 {
  98     if (txEnPin) {
  99         IOLo(txEnPin);
 100     }
 101 }
 102 #endif
 103
 104 static bool cc2500SpiDetect(void)
 105 {
 106     cc2500Reset(); // Reset the chip and give it time to wake up
 107
 108     const uint8_t chipPartNum = cc2500ReadReg(CC2500_30_PARTNUM | CC2500_READ_BURST); //CC2500 read registers chip part num
 109     const uint8_t chipVersion = cc2500ReadReg(CC2500_31_VERSION | CC2500_READ_BURST); //CC2500 read registers chip version
 110
 111     if (chipPartNum == 0x80 && chipVersion == 0x03) {
 112         return true;
 113     }
 114
 115     return false;
 116 }
 117
 118 bool cc2500SpiInit(void)
 119 {
 120     if (rxCc2500SpiConfig()->chipDetectEnabled && !cc2500SpiDetect()) {
 121         return false;
 122     }
 123
 124     if (!rxSpiExtiConfigured()) {
 125         return false;
 126     }
 127
 128 #if defined(USE_RX_CC2500_SPI_PA_LNA)
 129     if (rxCc2500SpiConfig()->lnaEnIoTag) {
 130         rxLnaEnPin = IOGetByTag(rxCc2500SpiConfig()->lnaEnIoTag);
 131         IOInit(rxLnaEnPin, OWNER_RX_SPI_CC2500_LNA_EN, 0);
 132         IOConfigGPIO(rxLnaEnPin, IOCFG_OUT_PP);
 133
 134         IOHi(rxLnaEnPin); // always on at the moment
 135     }
 136     if (rxCc2500SpiConfig()->txEnIoTag) {
 137         txEnPin = IOGetByTag(rxCc2500SpiConfig()->txEnIoTag);
 138         IOInit(txEnPin, OWNER_RX_SPI_CC2500_TX_EN, 0);
 139         IOConfigGPIO(txEnPin, IOCFG_OUT_PP);
 140     } else {
 141         txEnPin = IO_NONE;
 142     }
 143 #if defined(USE_RX_CC2500_SPI_DIVERSITY)
 144     if (rxCc2500SpiConfig()->antSelIoTag) {
 145         antSelPin = IOGetByTag(rxCc2500SpiConfig()->antSelIoTag);
 146         IOInit(antSelPin, OWNER_RX_SPI_CC2500_ANT_SEL, 0);
 147         IOConfigGPIO(antSelPin, IOCFG_OUT_PP);
 148
 149         IOHi(antSelPin);
 150     } else {
 151         antSelPin = IO_NONE;
 152     }
 153 #endif
 154 #endif // USE_RX_CC2500_SPI_PA_LNA
 155
 156 #if defined(USE_RX_CC2500_SPI_PA_LNA)
 157     cc2500TxDisable();
 158 #endif // USE_RX_CC2500_SPI_PA_LNA
 159
 160     if (rssiSource == RSSI_SOURCE_NONE) {
 161         rssiSource = RSSI_SOURCE_RX_PROTOCOL;
 162     }
 163
 164     return true;
 165 }
 166
 167 void cc2500ApplyRegisterConfig(const cc2500RegisterConfigElement_t *configArrayPtr, int configSize)
 168 {
 169     const int entryCount = configSize / sizeof(cc2500RegisterConfigElement_t);
 170     for (int i = 0; i < entryCount; i++) {
 171         cc2500WriteReg(configArrayPtr->registerID, configArrayPtr->registerValue);
 172         configArrayPtr++;
 173     }
 174 }
 175 #endif