Im currently working on a project and long story short im stuck on getting the nRF24l01 to communicate. I believe I have the Tx side of things working, however as I do not have a serial monitor and am relying on an Agilent Scope to measure my SPI transmissions which fluctuates based off what buttons I press.
Here is the code from my Tx side
SPI_Start();
spiData[0] = W_REGISTER | CONFIG;
spiData[1] = 0x4E;
SPI_SpiUartPutArray(spiData, 2); // reflect TX_DS and MAX_RT interrupts as IRQ active low, enable 2-byte CRC, power-up, TX mode
spiData[0] = W_REGISTER | SETUP_AW;
spiData[1] = 0x03;
SPI_SpiUartPutArray(spiData, 2); // 5 byte address
spiData[0] = W_REGISTER | RX_PW_P0;
spiData[1] = 0x01;
SPI_SpiUartPutArray(spiData, 2); // 1 byte of payload
CE_Write(0); // stand-by
for(;;)
{
spiData[0] = W_TX_PAYLOAD;
spiData[1] = SW1_Read();
SPI_SpiUartPutArray(spiData, 2); // send state of the switch to the TX FIFO
CE_Write(1); // enable chip - start sending data
CyDelayUs(10); // wait 10 microseconds
if ( IRQ_Read() == 0 ){ // check if there's an interrupt
SPI_SpiUartWriteTxData(NOP); // send no-operation to receive STATUS register and check kind of the interrupt
status = SPI_SpiUartReadRxData(); // read status register into a variable
if ((status & TX_DS) == 1){ // if data sent (or received when using enhanced shockburst mode) we're ok, so:
CE_Write(0); // stop sending
LED_Write(!LED_Read()); // toggle LED state
spiData[0]=STATUS;
spiData[1]=TX_DS;
SPI_SpiUartPutArray(spiData, 2); // clear interrupt
} else if ((status & MAX_RT) == 1) { // if max retries achieved, we basically forget that packet
CE_Write(0); // stop sending
spiData[0]=STATUS;
spiData[1]=MAX_RT;
SPI_SpiUartPutArray(spiData, 2); // clear interrupt
}
}
}
}
Again i think all the above works as intended per the data sheet. Here is the reciver side which I got from a dated CyPress forum post.
CyGlobalIntEnable;
SPI_Start();
spiData[0] = W_REGISTER | CONFIG;
spiData[1] = 0x3F;
SPI_SpiUartPutArray(spiData, 2); // reflect RX_DR interrupt as IRQ pin active low, enable 2-byte CRC, power-up, RX mode
spiData[0] = W_REGISTER | SETUP_AW;
spiData[1] = 0x03;
SPI_SpiUartPutArray(spiData, 2); // 5 byte address
spiData[0] = W_REGISTER | RX_PW_P0;
spiData[1] = 0x01;
SPI_SpiUartPutArray(spiData, 2); // 1 byte of payload
CE_Write(1); // enable chip = start listening
for(;;){
if (IRQ_Read()==1)
{LED_Write(1);
}else{
LED_Write(0);}
if (IRQ_Read() == 0) { // if there's an RX_DR interrupt, meaning data is received
CE_Write(0); // stop listening
dataSize=0;
do {
spiData[0] = R_RX_PAYLOAD;
spiData[1] = DUMMYDATA;
SPI_SpiUartPutArray(spiData, 2); // read payload
data[dataSize]=SPI_SpiUartReadRxData(); // throw payload into array
dataSize++;
spiData[0] = R_REGISTER | FIFO_STATUS;
spiData[1] = DUMMYDATA;
SPI_SpiUartPutArray(spiData, 2);
fifoStatus = SPI_SpiUartReadRxData();
} while ((fifoStatus & RX_EMPTY) == 0 && (dataSize < 3)); // do until RX FIFO empty
spiData[0] = STATUS;
spiData[1] = RX_DR;
SPI_SpiUartPutArray(spiData, 2); // clear interrupt
for (i=0; i<dataSize; i++) { // process received data
LED_Write(data[i]);
}
CE_Write(1); // start listening again
}
}
}
On the oscilloscope when im reading the MISO and MOSI on the tx i notice what appears to be a transmission however on the RX only the MOSI as a high wave and no lows. I have very basic coding skills and do not understand much about buffers and array sizes and the like. I did have to manuallly convert some PSoC 1 syntax to PSoC 3/4/5 and it appears to work however Im stuck. Any advice would be greatly apreciated and if anyone has done this and gotten it to work could you either post your solution or walk me thorugh my error?
Thanks to anyone who can help or point me in the right dirrection thanks.
