extern void nRF24L01_interrupt ()
{
uint8_t status;
// If still in transmitting mode then finish transmission
PORTD ^= 1<<0; //toggle bit
if (PTX) {
// Read nRF24L01 status
nRF24L01_CSN_lo; // Pull down chip select
status = spi_transmit_byte(NOP); // Read status register
nRF24L01_CSN_hi; // Pull up chip select
nRF24L01_CSN_lo; // Pull down chip select
spi_transmit_byte( FLUSH_TX ); // Write cmd to flush tx fifo
nRF24L01_CSN_hi; // Pull up chip select
nRF24L01_CE_lo; // Deactivate transreceiver
RX_POWERUP; // Power up in receiving mode
nRF24L01_CE_hi; // Listening for pakets
PTX = 0; // Set to receiving mode
// Reset status register for further interaction
nRF24L01_config_register(STATUS,(1<<TX_DS)|(1<<MAX_RT)); // Reset status register
}
}
void nRF24L01_config_register(uint8_t reg, uint8_t value)
// Clocks only one byte into the given nRF24L01 register
{
nRF24L01_CSN_lo;
spi_transmit_byte(W_REGISTER | (REGISTER_MASK & reg));
spi_transmit_byte(value);
nRF24L01_CSN_hi;
}
//============================================================
void write_buffer(uint16_t BufferOffset,uint8_t data)
{
CLR_SS_AT45DB();
spi_transmit_byte(0x84);//84
spi_transmit_byte(0xff);
spi_transmit_byte((uint8_t)(BufferOffset>>8));
spi_transmit_byte((uint8_t)BufferOffset);
spi_transmit_byte(data);
SET_SS_AT45DB();
}
//================================================================
uint8_t read_buffer(uint16_t BufferOffset)
{
uint8_t temp;
CLR_SS_AT45DB();
spi_transmit_byte(0xD4);//54
spi_transmit_byte(0xff);
spi_transmit_byte((uint8_t)(BufferOffset>>8));
spi_transmit_byte((uint8_t)BufferOffset);
spi_transmit_byte(0xff);
spi_transmit_byte(0xff);
temp=SPDR;
SET_SS_AT45DB();
return temp;
}
extern void nRF24L01_interrupt ()
{
// Read nRF24L01 status
uint8_t status;
nRF24L01_CSN_lo; // Pull down chip select
status = spi_transmit_byte(NOP); // Read status register
nRF24L01_CSN_hi; // Pull up chip select
//based upon the status register decide what to do
//if TX sucess
if ( status & (1<<TX_DS) )
{
nRF24L01_powerdown(); // Return to low power state
}
//maximum retrys reached
else if ( status & (1<<MAX_RT) )
{
//set some flag
nRF24L01_powerdown(); // Return to low power state
}
//recieved a packet
else if ( status & (1<<RX_DR) )
{
nRF24L01_get_data(buffer);
nRF24L01_powerdown();
}
// Reset status register for further interaction
nRF24L01_config_register(STATUS,( (1<<RX_DR) | (1<<TX_DS) | (1<<MAX_RT) ) ); // Reset status register
}
void nRF24L01_write_register(uint8_t reg, uint8_t * value, uint8_t len)
// Writes an array of bytes into inte the nRF24L01 registers.
{
nRF24L01_CSN_lo;
spi_transmit_byte(W_REGISTER | (REGISTER_MASK & reg));
spi_transmit_array(value,len);
nRF24L01_CSN_hi;
}
void nRF24L01_read_register(uint8_t reg, uint8_t * value, uint8_t len)
// Reads an array of bytes from the given start position in the nRF24L01 registers.
{
nRF24L01_CSN_lo;
spi_transmit_byte(R_REGISTER | (REGISTER_MASK & reg));
spi_transfer_array(value,value,len);
nRF24L01_CSN_hi;
}
extern void nRF24L01_get_data(uint8_t * data)
// Reads nRF24L01_PAYLOAD bytes into data array
{
nRF24L01_CSN_lo; // Pull down chip select
nRF24L01_CE_lo;
spi_transmit_byte( R_RX_PAYLOAD ); // Send cmd to read rx payload
spi_transfer_array(data,data,nRF24L01_PAYLOAD); // Read payload
nRF24L01_CSN_hi; // Pull up chip select
nRF24L01_config_register(STATUS,(1<<RX_DR)); // Reset status register
nRF24L01_CE_hi;
//Clear the TX FIFO
nRF24L01_CSN_lo; // Pull down chip select
spi_transmit_byte( FLUSH_TX ); // Write cmd to flush tx fifo
nRF24L01_CSN_hi; // Pull up chip select
}
extern uint8_t nRF24L01_data_ready()
// Checks if data is available for reading
{
// Read nRF24L01 status
uint8_t status;
nRF24L01_CSN_lo; // Pull down chip select
status = spi_transmit_byte(NOP); // Read status register
nRF24L01_CSN_hi; // Pull up chip select
return status & (1<<RX_DR);
}
extern void nRF24L01_powerdown()
//place nRF24L01 in powerdown mode
{
//empty the TX FIFO
nRF24L01_CSN_lo; // Pull down chip select
spi_transmit_byte( FLUSH_TX ); // Write cmd to flush tx fifo
nRF24L01_CSN_hi; // Pull up chip select
nRF24L01_CE_lo; // Deactivate transceiver
PWR_DOWN; // power down transceiver
nRF24L01_CE_hi; //
}
void nRF24L01_send(uint8_t * value, uint8_t len)
// Sends a data package to the default address. Be sure to send the correct
// amount of bytes as configured as payload on the receiver.
{
while (PTX) {} // Wait until last paket is send
nRF24L01_CE_lo;
PTX = 1; // Set to transmitter mode
TX_POWERUP; // Power up
nRF24L01_CSN_lo; // Pull down chip select
spi_transmit_byte( FLUSH_TX ); // Write cmd to flush tx fifo
nRF24L01_CSN_hi; // Pull up chip select
nRF24L01_CSN_lo; // Pull down chip select
spi_transmit_byte( W_TX_PAYLOAD ); // Write cmd to write payload
spi_transmit_array(value,len); // Write payload
nRF24L01_CSN_hi; // Pull up chip select
nRF24L01_CE_hi; // Start transmission
}
