rfm12b.cpp

00001 #include "mbed.h"
00002 #include "rfm12b.h"
00003 #include "rfm.h"
00004 
00005 /*!
00006  * \file       rfm12b.cpp
00007  * \brief      class for rfm2b in rawmode - only receive part implemented
00008  * \author     Karl Zweimüller based on code from WED 6.9.2009
00009  */
00010 
00011 
00012 /** Class rfm12b for RFM12B transceiver module
00013   http://www.hoperf.com/rf_fsk/rfm12b.htm
00014 */
00015 
00016 /** rfm12b object
00017 */
00018 rfm12b::rfm12b(PinName mosi, PinName miso, PinName sclk, PinName nsel, PinName rxdata) {
00019 
00020     rfm12b_spi  = new SPI(mosi, miso, sclk);   // mosi, miso, sclk
00021     cs          = new DigitalOut(nsel);        // nsel for chipselect
00022     m_pinRXData = new InterruptIn(rxdata);     // rxData- generates interrupts
00023 
00024     init_spi();            // init the spi-device
00025 }
00026 
00027 /** init the spi-communication
00028 */
00029 void rfm12b::init_spi() {
00030     // Setup the spi for 16 bit data : 1RW-bit 7 adressbit, 8 databit
00031     // second edge capture, with a 5MHz clock rate
00032     rfm12b_spi->format(16,0);
00033     rfm12b_spi->frequency(5000000);
00034 }
00035 
00036 ///////////////////////////////////////////////////////////////////////////////
00037 //
00038 // Initialise RF module
00039 // This are parameters for ETH Comfort by ELV
00040 ///////////////////////////////////////////////////////////////////////////////
00041 void rfm12b::RFM_init(void) {
00042 
00043     // 0. Init the SPI backend
00044     //RFM_TESTPIN_INIT;
00045 
00046     //RFM_READ_STATUS();
00047 
00048     // 1. Configuration Setting Command
00049     RFM_SPI_16(
00050         //RFM_CONFIG_EL           |
00051         //RFM_CONFIG_EF           |
00052         RFM_CONFIG_BAND_868     |
00053         RFM_CONFIG_X_11_0pf
00054     );
00055 
00056     // 2. Power Management Command
00057     //RFM_SPI_16(
00058     //     RFM_POWER_MANAGEMENT     // switch all off
00059     //     );
00060 
00061     // 3. Frequency Setting Command
00062     RFM_SPI_16(
00063         RFM_FREQUENCY            |
00064         RFM_FREQ_868Band(868.30)
00065     );
00066 
00067     // 4. Data Rate Command
00068     RFM_SPI_16(RFM_DATA_RATE_9600);
00069 
00070     // 5. Receiver Control Command
00071     RFM_SPI_16(
00072         RFM_RX_CONTROL_P20_VDI  |
00073         RFM_RX_CONTROL_VDI_FAST |
00074         //RFM_RX_CONTROL_BW(RFM_BAUD_RATE) |
00075         RFM_RX_CONTROL_BW_134 |
00076         RFM_RX_CONTROL_GAIN_0   |
00077         RFM_RX_CONTROL_RSSI_73
00078     );
00079 
00080     // 6. Data Filter Command
00081     RFM_SPI_16(
00082         //RFM_DATA_FILTER_AL      |
00083         //RFM_DATA_FILTER_ML      |
00084         //RFM_DATA_FILTER_DQD(3)
00085         RFM_DATA_FILTER_ANALOG
00086     );
00087 
00088     // 7. FIFO and Reset Mode Command
00089     RFM_SPI_16(
00090         RFM_FIFO_IT(8) |
00091         RFM_FIFO_DR
00092     );
00093 
00094     // 8. Receiver FIFO Read
00095 
00096     // 9. AFC Command
00097     RFM_SPI_16(
00098         RFM_AFC_AUTO_VDI        |
00099         RFM_AFC_RANGE_LIMIT_7_8 |
00100         RFM_AFC_EN              |
00101         RFM_AFC_OE              |
00102         RFM_AFC_FI
00103     );
00104 
00105     // 10. TX Configuration Control Command
00106     RFM_SPI_16(
00107         RFM_TX_CONTROL_MOD_30 |
00108         RFM_TX_CONTROL_POW_0
00109     );
00110 
00111     // 11. Transmitter Register Write Command
00112 
00113     // 12. Wake-Up Timer Command
00114 
00115     // 13. Low Duty-Cycle Command
00116 
00117     // 14. Low Battery Detector Command
00118 
00119     //RFM_SPI_16(
00120     //     RFM_LOW_BATT_DETECT |
00121     //     3      // 2.2V + v * 0.1V
00122     //     );
00123 
00124     // 15. Status Read Command
00125     //RFM_SPI_16(RFM_TX_ON());
00126     RFM_SPI_16(RFM_RX_ON());
00127 
00128 }
00129 
00130 ///////////////////////////////////////////////////////////////////////////////
00131 
00132 
00133 
00134 /** write and read 16 bit to device
00135 */
00136 uint16_t rfm12b::rfm_spi16(uint16_t outval) {
00137 
00138     uint16_t    readval;
00139     // Select the device by seting chip select low
00140     cs->write(0);
00141     wait_ms(1);               // wait before going on
00142     //write and read
00143     readval = rfm12b_spi->write(outval);
00144     // Deselect the device
00145     cs->write(1);
00146     wait_ms(1);               // wait before going on
00147     return(readval);
00148 }
00149 
00150