void mirf_send(uint8_t *value, uint8_t len) {
PMODE = TXMODE; // Set to transmitter mode
TX_POWERUP; // Power up
_delay_ms(5); // wait for transmitter to come up
mirf_CSN_lo; // Pull down chip select
SPI.transfer(FLUSH_TX); // Write cmd to flush tx fifo
mirf_CSN_hi; // Pull up chip select
mirf_CSN_lo; // Pull down chip select
SPI.transfer(W_TX_PAYLOAD); // Write cmd to write payload
spi_write_data(value, len); // Write payload
mirf_CSN_hi; // Pull up chip select
mirf_CE_hi; // Start transmission
_delay_us(15);
mirf_CE_lo;
}
// Send data and wait for an ACK
uint8_t mirf_transmit_data(void) {
TX_POWERUP; // Power up to transmitter mode
mirf_CSN_lo; // Pull down chip select
spi_transfer(FLUSH_TX); // Write cmd to flush tx fifo
mirf_CSN_hi; // Pull up chip select
mirf_CSN_lo; // Pull down chip select
spi_transfer(W_TX_PAYLOAD); // Write cmd to write payload
spi_write_data(data_out, mirf_PAYLOAD); // Write payload
mirf_CSN_hi; // Pull up chip select
mirf_CE_hi; // Start transmission
_delay_us(15);
mirf_CE_lo;
int waitcount = 0;
while (!(mirf_status() & (1<<TX_DS))) { // Wait until we receive an ACK back
_delay_us(500); // Wait the auto retransmit time
if (mirf_status() & (1<<MAX_RT)) { // If maximum retries reached
mirf_config_register(STATUS, 1<<MAX_RT); // Reset maximum retries to be able to transmit again next time
mirf_CE_hi;
_delay_us(15);
mirf_CE_lo;
}
waitcount++;
if (waitcount >= 10) { // If we haven't heard back in 5ms, exit
mirf_config_register(STATUS, 1<<MAX_RT); // Reset maximum retries to be able to transmit again next time
return 0;
}
}
mirf_config_register(STATUS,(1<<TX_DS)); // Reset status register
return 1;
}
// Writes an array of bytes into the MiRF register
void mirf_write_register(uint8_t reg, uint8_t *value, uint8_t len) {
mirf_CSN_lo;
spi_transfer(W_REGISTER | (REGISTER_MASK & reg));
spi_write_data(value, len);
mirf_CSN_hi;
}