// read various radio status and information registers
void radio_debug(void)
{
radio_get_int_status(0, 0, 0);
radio_get_chip_status(0);
radio_get_modem_status(0);
radio_part_info();
radio_func_info();
radio_request_device_state();
}
int main(void)
{
// configure WDT
WDTCTL = WDTPW | WDTHOLD; // stop watch dog timer
_25mhz();
#ifdef TEST
// when compiled in test mode, use different main
// disconnect radio when testing to avoid damage!
test_main();
#endif
// configure LED1 and turn it off, we'll use that for error and other stuff
P1DIR |= LED1;
LED1_OFF;
P4DIR |= LED2;
LED2_ON;
// setup uart
uart_init();
#ifdef DEBUG_MESSAGES
uart_send_string("Hola mundo!\r\n");
#endif
// setup packet handler
ph_setup();
// setup an configure radio
radio_setup();
radio_configure();
// self-calibrate image rejection
radio_calibrate_ir();
// verify that radio configuration was successful
radio_get_chip_status(0);
if (radio_buffer.chip_status.chip_status & RADIO_CMD_ERROR) { // check for command error
uart_send_string("Error inicializando radio!!!\r\n");
while (1) {
LED1_TOGGLE;
_delay_cycles(8000000); // blink LED if there was an error
}
}
// start packet receiving
ph_start();
#ifdef DEBUG_MESSAGES
uart_send_string("dAISy 0.2 started\r\n");
LED2_OFF;
#endif
while (1) {
LPM0; // deep sleep until something worthwhile happens
__no_operation();
ph_loop(); // packet handler house-keeping, e.g. channel hopping
#ifdef DEBUG_MESSAGES
uint8_t channel;
int16_t rssi;
// debug code to monitor signal strength (RSSI)
if (ph_get_state() == PH_STATE_PREFETCH) { // found preamble and start flag
// record current channel and signal strength
channel = ph_get_radio_channel(); // read current channel
rssi = ph_get_radio_rssi(); // read current RSSI
}
#endif
// retrieve last packet handler error
uint8_t error = ph_get_last_error();
#ifdef DEBUG_MESSAGES
// report error if packet handler failed
if (error != PH_ERROR_NONE) {
dec_to_str(str_output_buffer, 3, rssi); // convert to decimal string (reuse radio buffer)
str_output_buffer[4] = 0; // terminate string
uart_send_string("sync "); // send debug message to UART
uart_send_byte(channel + 'A');
uart_send_string(" RSSI=");
uart_send_string(str_output_buffer);
uart_send_string("dBm\r\n");
uart_send_string("error: ");
switch (error) {
case PH_ERROR_NOEND:
uart_send_string("no end flag");
break;
case PH_ERROR_STUFFBIT:
uart_send_string("invalid stuff bit");
break;
case PH_ERROR_CRC:
uart_send_string("CRC error");
break;
case PH_ERROR_RSSI_DROP:
uart_send_string("RSSI drop");
break;
}
uart_send_string("\r\n");
ph_loop(); // house keeping, sending over UART takes time
}
#else
// toggle LED if packet handler failed after finding preamble and start flag
if (error == PH_ERROR_NOEND || error == PH_ERROR_STUFFBIT || error == PH_ERROR_CRC)
LED1_TOGGLE;
#endif
// check if a new valid packet arrived
uint16_t size = fifo_get_packet();
if (size > 0) { // if so, process packet
#ifdef DEBUG_MESSAGES
dec_to_str(str_output_buffer, 3, rssi); // convert to decimal string (reuse radio buffer)
str_output_buffer[4] = 0; // terminate string
uart_send_string("sync "); // send debug message to UART
uart_send_byte(channel + 'A');
uart_send_string(" RSSI=");
uart_send_string(str_output_buffer);
uart_send_string("dBm\r\n");
#endif
LED2_ON;
nmea_process_packet(); // process packet (NMEA message will be sent over UART)
fifo_remove_packet(); // remove processed packet from FIFO
LED2_OFF;
}
// enter low power mode LPM0 (everything off)
// TODO: wait for UART to complete transmission
// TODO: suspend UART
}
}
