/////////////////////////////////////
// initialize the radio interface
//
// stick with me, this goes on for a while
// "may you live with interesting radios"
//
void init_radio(void) {
init_leds();
// Add Bitlash functions specific to this radio
// addBitlashFunction("degf", (bitlash_function) func_degf);
addBitlashFunction("freq", (bitlash_function) func_setfreq);
addBitlashFunction("rfget", (bitlash_function) func_rfget);
addBitlashFunction("rfset", (bitlash_function) func_rfset);
// Set output mode for outputs
// TODO: Ensure SS is set to output if L01_CSN moves off SS!
L01_PORT_DD |= (1<<L01_CE | 1<<L01_CSN | 1<<MOSI | 1<<L01_SCK);
// Set MISO as an input
L01_PORT_DD &= ~(1<<MISO);
L01_PORT &= ~(1<<MISO); // turn off the internal pullup
rf_end(); // Set -CSN high to deselect radio
// Initialize SPI interface to the radio
#if F_CPU == 8000000
// Enable SPI; be the Master; SPI mode 0; set up for 8/2 prescale for 4 MHz clock
SPCR = 0<<SPIE | 1<<SPE | 1<<MSTR | 0<<CPOL | 0<<CPHA | 0<<SPR1 | 0<<SPR0;
SPSR = 1<<SPI2X; // set 2x mode to make /4 into /2, so 4 MHz
#elif F_CPU == 16000000
//// Enable SPI; be the Master; SPI mode 0; set up for 16/4 prescale for 4 MHz clock
SPCR = 0<<SPIE | 1<<SPE | 1<<MSTR | 0<<CPOL | 0<<CPHA | 0<<SPR1 | 0<<SPR0;
SPSR = 0<<SPI2X; // 16 MHz does _not_ need 2X mode
#else
unsupported F_CPU
#endif
// clear the status and data registers
int junk = SPSR;
junk = SPDR;
// For RFM22: set CE low to enable radio (it's ~STBY)
rf_enable();
// Got radio?
for (;;) {
rf_set_register(REG_OP_MODE_1, 1<<SWRES); // Reset the radio
delay(1000);
// Verify we have a radio, and it is the right type
byte device_type = rf_read_register(REG_DEVICE_TYPE);
byte device_version = rf_read_register(REG_VERSION_CODE);
//printHex(device_type); speol();
//printHex(device_version); speol();
if ((device_type == DEVICE_TYPE_RXTX) &&
((device_version == DEVICE_RFM22_VER_2) || (device_version == DEVICE_RFM22B))) {
sp("RFM22 go!"); speol();
break;
} else {
sp("No radio."); speol();
}
}
//
// Set up radio registers for transmit and receive
//
// Disable ENPOR and ENCHIPRDY interrupt sources
// which are enabled by default
rf_set_register(REG_INTERRUPT_ENABLE_2, 0);
//set_ready_mode();
// Configure GPIO0-1 for tx-rx antenna switching
rf_set_register(REG_GPIO0_CONFIG, (3<<GPIODRV | 1<<PUP | 0x12)); // GPIO0 is TX-State -> TX-Ant control
rf_set_register(REG_GPIO1_CONFIG, (3<<GPIODRV | 1<<PUP | 0x15)); // GPIO1 is RX-State -> RX-Ant control
// Configure GPIO2 for 10MHz system clock output
rf_set_register(REG_MCLK_OUTPUT, MCLK_10MHZ);
// Data Access Control setup
// default for REG_DATA_ACCESS_CONTROL is fine: use the packet engine & crc checks
// rf_set_register(REG_DATA_ACCESS_CONTROL, (1<<ENPACRX | 1<<ENPACTX | 1<<ENCRC | CRC_CRC16);
// Frequency setup
//
// For North America, the default frequency band "fb" is 0x15 or 21
// so 21 * 20 MHz = 420 MHz offset + 480 Mhz base = 900 MHz band
//
// the default carrier frequency setting "fc" is 0xBB80 = 48000
// 48000/64000 = 0.75 * 2 * 10000 = 15000
// giving 900 + 15 = 915 MHz as default frequency
//
// TODO: ignoring frequency offset registers for the moment
//
// This is equivalent to the default setting:
//
// rf_set_register(REG_FREQUENCY_BAND_SELECT, (1<<SBSEL | 1<<HBSEL | 0x15));
// rf_set_register(REG_NOMINAL_CARRIER_FREQUENCY_HI, 0xbb);
// rf_set_register(REG_NOMINAL_CARRIER_FREQUENCY_LO, 0x80);
// or: rfset(0x75,0x75); rfset(0x76,0xbb); rfset(0x77,0x80)
//
// Decoding the example from the sample transmit/receive code for 434 MHz
// band select low band with offset of 19
// 240 + 19*10 = 430
//
// the remaining 4 mhz is to be found in the r76/77 carrier center freq
// 0x6400 = 25600
// 25600/64000 = 0.4
// 0.4 * 10000 = 4000
//
// This is the equivalent code to set 434 MHz using our defines:
//rf_set_register(REG_FREQUENCY_BAND_SELECT, (1<<SBSEL | 0<<HBSEL | 0x13));
//rf_set_register(REG_NOMINAL_CARRIER_FREQUENCY_HI, 0x64);
//rf_set_register(REG_NOMINAL_CARRIER_FREQUENCY_LO, 0x00);
// or from the console: rfset(0x75,0x53); rfset(0x76,0x64); rfset(0x77,0x00)
// TX Data Rate Setup
//
// this fragment from the example sets up for 4800 bps:
// spi_write(0x6e, 0x27); // Tx data rate 1
// spi_write(0x6f, 0x52); // Tx data rate 0
//
// for HBSEL=1, TX_DR = 1000 * txdr / 2^16
// for HBSEL=0, TX_DR = 1000 * txdr / 2^21
//
// the default on this sample part is 0x0a3d => 39.9938 kbps, call it 40kbps
//
// inverting the formula:
// value = (baud/1000)*(2^21)/1000 for baud < 30000
// value = (baud/1000)*(2^16)/1000 for baud >= 30000
//
// these values are copied from the file doc/rfm-22-calculations.ods:
//
// baud divisor divisor, hex
// 1200 2516 09D4
// 2400 5033 13A9
// 4800 10066 2752
// 9600 20132 4EA4
//
// 40000 2621 0A3D <-- this is the default 6e/6f setting
// 57600 3774 0EBE
// 64000 4194 1062
// 96000 6291 1893
// 100000 6553 1999
// 128000 8388 20C4
//
// Configure the data rate
//
#define TX_DATA_RATE 40000
//#define TX_DATA_RATE 100000
#if TX_DATA_RATE == 40000
// 40kbps is the factory setting;
// take all the defaults but turn on FIFO and FSK
rf_set_register(REG_MODULATION_MODE_CONTROL_2,
(0<<TRCLK | MOD_FIFO<<DTMOD | 0<<ENINV | 0<<FD_8 | MOD_FSK<<MODTYP));
#elif TX_DATA_RATE == 100000
// Set data rate to 100000 bps
// NOTE: don't forget to double check the TXDTRTSCALE bit in 0x70 if you set below 30k
rf_set_register(REG_TX_DATA_RATE_HI, 0x19);
rf_set_register(REG_TX_DATA_RATE_LO, 0x99);
// Frequency Deviation setup
//
// value in increments of 625 Hz
// default of 0x20 gives 0x20 = 32 * 625 Hz = 20 KHz
// example uses 45k/625 = 72
//
#define TX_DEVIATION 50000
#if TX_DEVIATION == 50000
// for 100kbps, with deviation at 50 kHz = 50000/625 = 80 = 0x050
// NOTE: high bit goes in REG_MODULATION_CONTROL_2 as FD_8
rf_set_register(REG_FREQUENCY_DEVIATION, 0x50);
// Set up for FIFO io and FSK modulation
// NOTE: high bit of deviation is here!
rf_set_register(REG_MODULATION_MODE_CONTROL_2,
(0<<TRCLK | MOD_FIFO<<DTMOD | 0<<ENINV | 0<<FD_8 | MOD_FSK<<MODTYP));
// Set up RX Modem Configuration per Table 16
//
// For 100kbps/100kHz settings:
rf_set_register(REG_IF_FILTER_BANDWIDTH, (1<<DWN3_BYPASS | 0<<NDEC_EXP | 0xf<<FILSET));
rf_set_register(REG_CLOCK_RECOVERY_OVERSAMPLING_RATE, 0x78);
rf_set_register(REG_CLOCK_RECOVERY_OFFSET_2, (0<<RXOSR_8_10 | 0<<STALLCTRL | 1<<NCOFF_16_19));
rf_set_register(REG_CLOCK_RECOVERY_OFFSET_1,(0x11));
rf_set_register(REG_CLOCK_RECOVERY_OFFSET_0,(0x11));
rf_set_register(REG_CLOCK_RECOVERY_GAIN_1,(0x04));
rf_set_register(REG_CLOCK_RECOVERY_GAIN_0,(0x46));
#elif TX_DEVIATION == 300000
// for 100kbps, set deviation at 300 kHz = 300000/625 = 480 = 0x1e0
// NOTE: high bit goes in REG_MODULATION_CONTROL_2 as FD_8
rf_set_register(REG_FREQUENCY_DEVIATION, 0xe0);
// Set up for FIFO io and FSK modulation
// NOTE: high bit of deviation is here!
rf_set_register(REG_MODULATION_MODE_CONTROL_2,
(0<<TRCLK | MOD_FIFO<<DTMOD | 0<<ENINV | 1<<FD_8 | MOD_FSK<<MODTYP));
// Set up RX Modem Configuration per Table 16
//
// For 100kbps/300kHz settings:
rf_set_register(REG_IF_FILTER_BANDWIDTH, (1<<DWN3_BYPASS | 0<<NDEC_EXP | 0xe<<FILSET));
rf_set_register(REG_CLOCK_RECOVERY_OVERSAMPLING_RATE, 0x78);
rf_set_register(REG_CLOCK_RECOVERY_OFFSET_2, (0<<RXOSR_8_10 | 0<<STALLCTRL | 1<<NCOFF_16_19));
rf_set_register(REG_CLOCK_RECOVERY_OFFSET_1,(0x11));
rf_set_register(REG_CLOCK_RECOVERY_OFFSET_0,(0x11));
rf_set_register(REG_CLOCK_RECOVERY_GAIN_1,(0x00));
rf_set_register(REG_CLOCK_RECOVERY_GAIN_0,(0xb8));
#else
unsupported TX_DEVIATION
#endif
#else
unsupported TX_DATA_RATE
#endif
// Header Configuration
//
// Enable header checking and broadcast matching on all address bytes
rf_set_register(REG_HEADER_CONTROL_1, (0xf<<BCEN | 0xf<<HDCH));
// Set up for 4 byte header, variable packet length, 2 byte sync, 0 for MSB Preamble Length
// (default is 0x22: HDLEN 010 Header 3 and 2; Sync Word 3 and 2)
//
rf_set_register(REG_HEADER_CONTROL_2, (4<<HDLEN | 0<<FIXPKLEN | 1<<SYNCLEN | 0<<PREALEN8));
// Preamble Length
// the default preamble length is 8 nibbles / 32 bits
// the sample transmit / receive code provided by HopeRF uses 64 nibbles instead(!)
// the table on page 43 recommends 40 bits (10 nibbles), so we use that here
//
// TODO: test with shorter preamble for performance
//
rf_set_register(REG_PREAMBLE_LENGTH, (40/4));
// Preamble Detect Threshold
//
// DOCBUG: possible doc issue regarding preamble threshold:
// rfget(0x35) is 0x20 at bootup; this is 4<<3, not 5<<3 per doc p.106
// (not to mention register 0x35 is missing from the summary table)
// 4 nibbles is 16 bits, but on page 42 it is recommended to use 20 bits
// so we set PREATH to 20 bits here; that's 5 nibbles
//
rf_set_register(REG_PREAMBLE_DETECTION_CONTROL_1, (20/4)<<PREATH);
// Sync Pattern and Length
// we use the default sync pattern of 2dd4 with 2 byte check
// Enable the radio so rf_set_rx_address is a pass-thru below
radio_go = 1; // mark the radio as UP
// Receive address setup: listen on NOOB, and the broadcast address,
// until setid() is called to provide an updated address.
// If setid() was called before now, use the cached value.
// (Tx address is set up per packet)
//
rf_set_rx_address((*nodeid) ? nodeid : (char *) DEFAULT_RX_ADDRESS);
set_rx_mode(); // engage the receiver and off we go
}
int main (void)
{
SystemInit();
#if ACMP_TEST == TRUE
// --------------------------------------------
// analog comparator
// --------------------------------------------
acmp_io_config();
#if CONFIG_ENABLE_DRIVER_ACMP0==TRUE
analog_pin_enable(AIN0, MASK_ENABLE);
analog_pin_enable(AIN1, MASK_ENABLE);
acmp0_done = 0;
// comparator0 test
//comparator_init(ACMP0, VDD_1, ACMPO_0_GEN_INT, acmp0_test_cb);
//comparator_init(ACMP0, VDD_8, ACMPO_1_GEN_INT, acmp0_test_cb);
//comparator_init(ACMP0, VDD_15, ACMPO_0_GEN_INT, acmp0_test_cb);
comparator_init(ACMP0, EXT_REF, ACMPO_1_GEN_INT, acmp0_test_cb);
while (acmp0_done == 0);
#endif
#if CONFIG_ENABLE_DRIVER_ACMP1==TRUE
analog_pin_enable(AIN2, MASK_ENABLE);
analog_pin_enable(AIN3, MASK_ENABLE);
acmp1_done = 0;
// comparator1 test
//comparator_init(ACMP1, VDD_1, ACMPO_0_GEN_INT, acmp1_test_cb);
comparator_init(ACMP1, VDD_8, ACMPO_0_GEN_INT, acmp1_test_cb);
//comparator_init(ACMP1, VDD_15, ACMPO_0_GEN_INT, acmp1_test_cb);
while (acmp1_done == 0);
#endif
#endif
#if RF_SWEEP_TEST == TRUE
// --------------------------------------------
// analog RF
// --------------------------------------------
int mask = SYSCON_MASK_DIS_REF_PLL
| SYSCON_MASK_DIS_LO_VCO
| SYSCON_MASK_DIS_LO_PLL
| SYSCON_MASK_DIS_PA;
syscon_SetPGCR1WithMask(QN_SYSCON, mask, MASK_DISABLE);
rf_enable(RF_TX, MASK_ENABLE, MASK_ENABLE, 0x1F);
rf_tx_power_level_set(TX_GAIN_LEVLE10);
for (int i = 0; i < 40; i++) {
rf_set_freq(RF_TX, i);
delay(10000);
}
#endif
while (1) /* Loop forever */
{
}
}
