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nRF24L01+ full driver by Eduardo Guilherme Brandt
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kenvinh



Joined: 13 Jun 2012
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PostPosted: Thu Jun 14, 2012 10:35 am     Reply with quote

Yeah, thanks, I will try to use software spi and disable every line of spi_read() like you said.
By the way, I don't have my own debugger, so I use printf function there only to check the spi_xfer() get stuck or not, because I think after writing command to nRF24L01 successfully it will inform me on rs232. Is this the right way?
Eduardo__



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PostPosted: Thu Jun 14, 2012 5:12 pm     Reply with quote

driver not sends anything automaticaly through RS232.

Yes, you can use printf and a serial output to "see" some data value.

I´ve already programed pic without debugger. I may say you that you will expend more than twice time to found an error without debugger. I strongly recomend you buy one. This is not expensive fo PIC. Just U$89,00 the U64 from CCS.

See http://www.ccsinfo.com/product_info.php?products_id=icd_u64

Good luck
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Eduardo Guilherme Brandt
kenvinh



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PostPosted: Fri Jun 15, 2012 4:22 am     Reply with quote

Thanks for your suggestion, now I can get rid of the stucking position by using software spi and disable all the line with spi_read2() and it's really exciting to see it can get through:
Code:
 #USE SPI(DI=PIN_C4, DO=PIN_C5, CLK=PIN_C3,ENABLE=PIN_C0, MASTER, BAUD=5000000, MODE=0, BITS=8, MSB_FIRST, STREAM=RF24_SPI)

After that, I run the function RF24_check_config() (after the RF24_default_config())to make sure the value in the register is what i expected to see. And as usual, I insert some line in header file to see what's it real value by using rs232 to display the bbuf value.
Code:

void RF24_check_config() {      //Check actual configuration(only for debugging purposes, stop in each delay)
   int bbuf[40];
   
   RF24_comm_in(R_REGISTER|CONFIGURATION, bbuf, 1);//EN_CRC|CRC16|PWR_UP);   //RF_packet CRC and nRF24L01+ configuration and initialization
   printf("%u",bbuf); // It display 67
   bbuf = 0;
   delay_ms(5000);
     
   RF24_comm_in(R_REGISTER|EN_AUTOACK, bbuf, 1);         //0b00011111);   //autoack in pipe 0,1,2,3,4 and 5
   printf("%u",bbuf);
   bbuf = 0;
   delay_ms(5000);

   RF24_comm_in(R_REGISTER|EN_RXPIPES, bbuf, 1);         //0b00000011);   //****enable only pipes 0 and 1(pipes 2 to 5 are not used)
   printf("%u",bbuf);   
   bbuf = 0;
   delay_ms(5000);

And all the value I receive is 67, I have no idea what this value come from? But it the same for every register value.
I don't know if there's still any problem with SPI communication. I'm trying to figure out
Eduardo__



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PostPosted: Fri Jun 15, 2012 8:32 am     Reply with quote

You should printf the value bbuf[0] and not the value of the pointer bbuf, that could be 67 or any other memory address).

See RF24_default_config() values to see what is expected to see when you check configuration.

Another thing: Use directive FORCE_SW in SPI.
Software spi can not manage more than 1MHz(you programmed 5MHz)... it is very difficult to achieve.
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Eduardo Guilherme Brandt
kenvinh



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PostPosted: Sat Jun 16, 2012 4:55 am     Reply with quote

Hi Eduardo,
I'm trying to check back my spi connection on forum.
I'll post back when I solve it. Thanks
mrdongus



Joined: 18 Jun 2012
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version of CCS and nRF24L01
PostPosted: Mon Jun 18, 2012 2:27 pm     Reply with quote

Hi Eduardo.
Can I use your code with module nRF24L01 (not nRF24L01+). My CCS C is version 4.120 Can I use this to write code with your library ?
Thank you !
Eduardo__



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PostPosted: Mon Jun 18, 2012 2:58 pm     Reply with quote

Of course yes.
The unique difference between nRF24L01 and nRF24L01+ is that nRF24L01 will not be able to support 2Mbps RF data transfers(only 256kbps or 1Mbps).

So change datarate configuration to less than 2Mbps. You may change default_config() function directly, also.

Best Wishes
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Eduardo Guilherme Brandt
kenvinh



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PostPosted: Tue Jun 19, 2012 6:40 pm     Reply with quote

My module is also nRF24L01, and as the specification I read, it can also reach the 2mbps rate, only the nRF2401 is limited at 1mbps.
As far as I know when reading the datasheet, the reason nRF24L01 not "recommended for new design" is its commands and registers arrangement.
For example, when I use Eduardo code, before I can use R_RX_PL_WID, W_ACK_PAYLOAD or W_TX_PAYLOAD_NOACK, I have to issue the command ACTIVATE followed by data 0x73 but in nRF24L01+, you can use those 3 commands directly
The different working mode is still frustrating me. Is the transmitter search for a "suitable" receiver before trasmitting? The FIFO is used for every mode?
Eduardo__



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PostPosted: Wed Jun 20, 2012 7:51 am     Reply with quote

Thanks Kevinh!

I did not know about that. There is some more difference? Only that?
But, despite of that command, nRF24L01 is RF compatible untill 1Mbps with nRF24L01+, isn´t it?

thanks a lot! Smile
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Eduardo Guilherme Brandt
Eduardo__



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PostPosted: Wed Jun 20, 2012 7:53 am     Reply with quote

Kevinh.
I think you mean you module is also nRF24L01+(plus), not nRF24L01, isn´t it?
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Eduardo Guilherme Brandt
kenvinh



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PostPosted: Wed Jun 20, 2012 10:05 am     Reply with quote

Yes, Eduardo, your code is mostly compatible with my nRF24L01.
The differences at the command is like I said.
About the register, there's also some differences:
1. At RF_SETUP (0x06): nRF24L01+ has CONT_WAVE and it can set 250kpbs, 1 or 2Mbps; but the older don't have CONT_WAVE and can set 1 or 2Mbps only. Can you explain me the CONT_WAVE usage, I see you disable it in your code.
2. At RPD (0x09): nRF24L01 has that register with the name CD (Carrier detect), its functionality isn't mentioned well as thats in nRF24L01+

That's all the differences I know between these two modules, I'm still trying to understand well the operation of this RF module. It's really interesting though Very Happy

Here's the link to nRF24L01.
http://www.nordicsemi.com/eng/Products/2.4GHz-RF/nRF24L01
Eduardo__



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PostPosted: Wed Jun 20, 2012 10:30 am     Reply with quote

In continuous wave mode, the RF transmitter is transmitting continuously, without any data.

You can use it just to check signal strength(with a spectrum analyzer) or any other tests you want to check transmitter circuit operation.

for that, use the command:

Code:
RF24_waveout_testing(int channel) ;    //TX is always on transmitting sinc signal


--------------------
RPD? Yes, you can check it. it will tell you whether there is RF signal(over -65dB) on-air in the current selected channel.
use the command:

Code:
RF24_RX_power_detector()        //Returns 1 if power is over -65dbm  (RPD bit)

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Eduardo Guilherme Brandt
kenvinh



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PostPosted: Wed Jun 20, 2012 10:35 am     Reply with quote

Ok, I got it, thanks
kenvinh



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PostPosted: Fri Jun 22, 2012 9:09 am     Reply with quote

Hi, Eduaro.
After spending some time checking back my spi connections. I found out some mistakes and now I'm sure my spi connection is ok now (I made communication with 25LC256 eeprom)
I backed on my nRF24L01 modules, I checked all the configuration by some LEDs, and it's showing the correct default configurations.
So I made a simple test, one 18F4550 as receiver and one 18F4550 as a transmitter sending repeatedly 1 byte data.

Transmitter code: (I used leds to indicate the progress)
Code:

   int bbuf[40];
   //Initialization
   RF24_initPorts();
   output_d(0xAA);
   delay_ms(500);
   output_d(0);
   delay_ms(100);
   
   //Write configuration
   RF24_default_config();
   output_d(0xAA);
   delay_ms(500);
   output_d(0);
   delay_ms(100);
   
   //Set TX mode
   RF24_TX_SET();
   output_d(0xAA);
   delay_ms(500);
   output_d(0);
   delay_ms(100);     
   while(true)
   {
      output_d(0b11000011); // Indicating it's transmitting
      delay_ms(500);
      output_d(0);
      delay_ms(100);     
      bbuf[0] = 0b00110011;
      RF24_TX_putbuffer(true,1,bbuf[0]);
      delay_ms(100);
   }
}


Receiver code: (Again the leds were used to indicating waiting)
Code:

   int RXbuffer[40];
   int RXdatasize, RXpipe;
   
   //Initialization
   RF24_initPorts();
   output_d(0xAA);
   delay_ms(500);
   output_d(0);
   delay_ms(100);

   //Write configuration
   RF24_default_config();
   output_d(0xAA);
   delay_ms(500);
   output_d(0);
   delay_ms(100);
   
   //Set RX mode
   RF24_RX_SET();
   output_d(0xAA);
   delay_ms(500);
   output_d(0);
   delay_ms(100);
   while(true)
   {
      while(RF24_RX_getbuffer(&RXpipe,&RXdatasize,RXbuffer)!=true)
      {
          output_d(255);
          delay_ms(100);
          output_d(0);
          delay_ms(100);
      } //All leds blinking while waiting
      output_d(RXbuffer[0]); //If data received, it will display 0b00110011
      delay_ms(50);
   }
}
.
As both leds on transmitter and receiver were blinking, I did assume that transmitter was doing his job and receiver just keep waiting, I don't know why it can't receive any data.
Where did I make mistake? My SPI is running at 3MHz, and both is working at MODE=0
UenX



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PostPosted: Thu Aug 16, 2012 8:41 am     Reply with quote

Hi Eduardo.
(First, sorry for my bad English)
I'm working on a nRF24L01 project and I am so happy I found your CCS driver.

I'm testing transmitting on a PIC18F4550 ( using a 16x2 charracter LCD for debugging ) and receiving on a PIC18F2550 ( using a LED for debugging );

Transmitting seems OK, cause there was some changes on interrupt pin (IRQ) ( 0 --> 1) after sending data.

But receiver couldn't catch any thing in the air. It stucks in the "while(read buffer )"

I had done some check on transmitter 's config using your check_config() function

I tried to output bbuf[0] :
Code:
// convert int8 to binary and output to LCD
void outputAsBin(int8 val)
{
   int8 mask=128;
   while (mask)
   {
      if (mask & val) lcd_putc('1');
      else lcd_putc('0');
      mask /= 2;
   }
}


void RF24_check_config() {
///.....

  RF24_comm_in(R_REGISTER|CONFIGURATION, bbuf, 1);      //EN_CRC|CRC16|PWR_UP) --> which is 0000 1110;   //RF_packet CRC and nRF24L01+ configuration and initialization
// output  result of reading config register and delay 5 seconds for viewing
  lcd_putc("\fConf=");   outputAsBin(bbuf [ 0 ]); delay_ms(5000);


----> the LCD displays "Conf = 0000 0100" and the same for AUTO_ACK, ADDRESS_WITDTH......


Can you help me out of this? Thank you.

UPDATE:
The code runs fine after I made some changes in your nRF24L01P.c :
replace all "spi_read2" calls by "spi_read" Confused
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