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kenvinh
Joined: 13 Jun 2012
Posts: 12
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 Posted: Thu Jun 14, 2012 10:35 am |
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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? |
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Eduardo__
Joined: 23 Nov 2011
Posts: 197
Location: Brazil
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| Posted: Thu Jun 14, 2012 5:12 pm |
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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 |
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kenvinh
Joined: 13 Jun 2012
Posts: 12
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| Posted: Fri Jun 15, 2012 4:22 am |
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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);
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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 |
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Eduardo__
Joined: 23 Nov 2011
Posts: 197
Location: Brazil
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| Posted: Fri Jun 15, 2012 8:32 am |
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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 |
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kenvinh
Joined: 13 Jun 2012
Posts: 12
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| Posted: Sat Jun 16, 2012 4:55 am |
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Hi Eduardo,
I'm trying to check back my spi connection on forum.
I'll post back when I solve it. Thanks |
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mrdongus
Joined: 18 Jun 2012
Posts: 2
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| version of CCS and nRF24L01 |
| Posted: Mon Jun 18, 2012 2:27 pm |
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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 ! |
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Eduardo__
Joined: 23 Nov 2011
Posts: 197
Location: Brazil
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| Posted: Mon Jun 18, 2012 2:58 pm |
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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 |
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kenvinh
Joined: 13 Jun 2012
Posts: 12
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| Posted: Tue Jun 19, 2012 6:40 pm |
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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? |
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Eduardo__
Joined: 23 Nov 2011
Posts: 197
Location: Brazil
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| Posted: Wed Jun 20, 2012 7:51 am |
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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! 
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Eduardo Guilherme Brandt |
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Eduardo__
Joined: 23 Nov 2011
Posts: 197
Location: Brazil
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| Posted: Wed Jun 20, 2012 7:53 am |
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Kevinh.
I think you mean you module is also nRF24L01+(plus), not nRF24L01, isn´t it?
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Eduardo Guilherme Brandt |
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kenvinh
Joined: 13 Jun 2012
Posts: 12
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| Posted: Wed Jun 20, 2012 10:05 am |
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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 
Here's the link to nRF24L01.
http://www.nordicsemi.com/eng/Products/2.4GHz-RF/nRF24L01 |
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Eduardo__
Joined: 23 Nov 2011
Posts: 197
Location: Brazil
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| Posted: Wed Jun 20, 2012 10:30 am |
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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
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--------------------
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 |
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kenvinh
Joined: 13 Jun 2012
Posts: 12
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| Posted: Wed Jun 20, 2012 10:35 am |
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| Ok, I got it, thanks |
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kenvinh
Joined: 13 Jun 2012
Posts: 12
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| Posted: Fri Jun 22, 2012 9:09 am |
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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);
}
}
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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);
}
}
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.
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 |
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UenX
Joined: 16 Aug 2012
Posts: 6
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| Posted: Thu Aug 16, 2012 8:41 am |
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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"  |
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