void mrf_init(void)
{
mrf_gpio_init(); // Set up p14 and p21
mrf_spi_init(8, 0, 500000); // 8-bit transfers, CPOL=0/CPHA=0, sclk = 500kHz
mrf_reset(); // Hard and soft reset, configure for Tx/Rx
// Only enable interrupts after the radio is configured
mrf_gpioint_init();
}
/******************************************************************************
mrf_init433
*******************************************************************************
Initializes the RFM12/SI4420 with the default parameters for 433MHz operation.
Note: the transceiver is deactivated. Selection of transmit or receive mode
must be done after initialization with mrf_setradiotx or mrf_setradiorx;
Input:
bitrate: data transmission speed in bits per second
******************************************************************************/
void mrf_init433(unsigned long bitrate)
{
// Init the SPI interface
mrf_spi_init();
// Set FFS# high.
mrf_setffs(1);
// Setup the radio configuration
mrf_command(CSCREG|0xD7); // el ef 433MHz 12pF
//PMCREG|0xD9, // er ebb es ex dc (initial)
mrf_command(FSCREG|0x640); // 434MHz
mrf_setdatarate(bitrate);
_shadow_PSCREG = 0x4A0; // nINT/VDI is VDI, fast, BW 134KHz, LNA 0dB, RSSI -103dBm
mrf_command(PSCREG|_shadow_PSCREG);
mrf_command(DFCREG|0xAC); // clock recovery auto lock, clock recovery slow, DQD=4
mrf_command(FRMCREG|0x81); // FIFO interrupt level 8, FIFO fill start condition synchron pattern, !ff, disable sensitive reset
//AFCCREG|0x83, // keep offset during receiving, no range restriction, !st, not fine mode, not enable frequency offset register, not enable calculation of offset (initial)
mrf_command(AFCCREG|0x00); // disable all AFC options
_shadow_TXCCCREG = 0x50; // !mp, 90KHz, 0dB
mrf_command(TXCCCREG|_shadow_TXCCCREG);
mrf_command(WUTCREG|0x00); // Wake-up timer unused
mrf_command(LDCCREG|0x00); // Low duty-cycle not enabled
//AFCCREG|0x00,
//FRMCREG|0x81
mrf_setradioidle();
mrf_command(0x0000); // Reads the status register. This clears any possible interrupts.
}
