low_level_RF.cpp

00001 /* this file needs customization 
00002    according the target hardware
00003 */
00004 
00005 
00006 #include "mbed.h"
00007 
00008 extern "C" void rf_if_interrupt_handler(void);
00009 
00010 #if defined(TARGET_K64F)
00011 SPI spi(PTD2, PTD3, PTD1);
00012 #elif defined(TARGET_NUCLEO_F401RE)
00013 SPI spi(SPI_MOSI, SPI_MISO, SPI_SCK);
00014 #elif defined(TARGET_NUCLEO_F411RE)
00015 SPI spi(SPI_MOSI, SPI_MISO, SPI_SCK);
00016 #else
00017 /*  "SPI not defined for this platform" */
00018 SPI spi(D11, D12, D13);
00019 #endif
00020 
00021 DigitalOut RF_CS(D10);
00022 DigitalOut RF_RST(D5);
00023 DigitalOut RF_SLP_TR(D7);
00024 InterruptIn RF_IRQ(D9);
00025 
00026      
00027 extern "C" void RF_IRQ_Init(void) {
00028     
00029     RF_IRQ.rise(&rf_if_interrupt_handler);
00030 }
00031 
00032 extern "C" void RF_RST_Set(int state) {
00033     RF_RST = state;
00034 }
00035 
00036 extern "C" void RF_SLP_TR_Set(int state) {
00037     RF_SLP_TR = state;
00038 }
00039 
00040 extern "C" void RF_CS_while_active(void) {
00041     
00042     while(!RF_CS);
00043 }
00044 
00045 
00046 extern "C" int spi_read(char addr) {
00047     
00048   // Select the device by seting chip select low
00049   RF_CS = 0;
00050   // Write the reg. address
00051   spi.write(addr);
00052   // write a dummy value to read the reg. value
00053   int val = spi.write(0x00);
00054   // Deselect the device
00055   RF_CS = 1;
00056   return val;
00057 } 
00058 
00059 extern "C" void spi_write(char addr, char val) {
00060     
00061   // Select the device by seting chip select low
00062   RF_CS = 0;
00063   // Write the reg. address
00064   spi.write(addr);
00065   // write the value to the addresses register
00066   spi.write(val);
00067   // Deselect the device
00068   RF_CS = 1;
00069 }
00070 
00071 extern "C" void RF_CS_Set(int state) {
00072     RF_CS = state;
00073 }
00074 
00075 extern "C" int spi_exchange(char value) {
00076     
00077   // write the value
00078   int val = spi.write(value);
00079     return val;
00080 }