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artohautala
Joined: 17 Nov 2011
Posts: 187
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| what's wrong with my code using hope RFM12B |
 Posted: Sat Sep 12, 2015 6:16 am |
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Hello friends,
I'm trying to get two PICs to communicate together using HOPE RFM12B
modules...
And this simple test program ...
But no success ... nothing happens .. so I 'll be happy if you can help me solve this problem
here's my code for RX:
I have check all hardware +3.3 V for RFM12 and +5 V for PIC.
| Code: |
#include <16F73.h>
#fuses HS,NOWDT,PUT
#use delay(clock = 10000000)
//use spi_xfer!!
#use SPI(MASTER, BAUD = 4800,DI = PIN_B5, DO = PIN_B4, CLK = PIN_B3, ENABLE = PIN_B2, BITS = 16)
#define nIRQ PIN_B1
#define LED PIN_A0
void Init_RF12_RX(void);
int16 RX_RFBUF[19];
//************************************************************
void main(void){
int16 CheckSum = 0;
int16 result = 0;
int1 k = TRUE;
int8 i = 0;
Init_RF12_RX();
while(k){ //k to avoid compiler warning!
while(input(nIRQ) == 0){
CheckSum = 0;
for(i = 0; i < 5; ++i){ //ignore sync. words 3 x 0xAA,0x2D, 0xD4 (16 bits)
result = spi_xfer();
}
for(i = 0; i < 16; ++i){ //datawords 16 x 16 bits to memory buffer
RX_RFBUF[i] = spi_xfer();
CheckSum = CheckSum + RX_RFBUF[i];
}
RX_RFBUF[16] = spi_xfer(); //checksum to memory
//CheckSum = RX_RFBUF[16];
if( CheckSum == RX_RFBUF[16]){
output_high(LED);
}
delay_us(1);
output_low(LED);
}
}
}
//************************************************************void Init_RF12_RX(void){ //init RX
output_low(LED);
spi_xfer(0x80E8); //868 Mhz band
spi_xfer(0x82D8); //enable receive !PA
spi_xfer(0xA640);
spi_xfer(0xC647); //bitrate 4800
spi_xfer(0x94A0); //VDI, FAST, 134 kHZ,0dBm -103 dBm (receiver control command ?)
spi_xfer(0xC2AC); //data filter command
//spi_xfer(0xCC77); //10 Mhz clock
spi_xfer(0xCC67); //10 Mhz clock both tried no success
spi_xfer(0xCA80); //FIFO and reset mode command
spi_xfer(0xCA83); //FIFO8, SYNC
spi_xfer(0xC49B);
spi_xfer(0x9850); //!mp,9810 = 30 kHz, MAX OUT WRONG!
spi_xfer(0xE000); //WAKEUP TIMER , NOT USED
spi_xfer(0xC800); //low duty command , NOT USED
spi_xfer(0xC000); //1.0 Mhz, 2,2 V
}
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and here's my code for TX:
| Code: |
#include <16F73.h>
#fuses HS,NOWDT,PUT
#use delay(clock = 10000000)
#define LED PIN_A0
#define nIRQ PIN_B1
//use spi_xfer!!
#use SPI(MASTER, BAUD = 4800,DI = PIN_B5, DO = PIN_B4, CLK = PIN_B3, ENABLE = PIN_B2, BITS = 16)
void Init_RF12(void); //init tx
//************************************************************
void main(void){
int16 ChkSum;
int8 i = TRUE; //to avoid warning while(1)...
delay_ms(100); //0.1s delay for startup
for( i = 0; i < 5; ++i){ //blink led 5 times for test
output_high(LED);
delay_ms(100);
output_low(LED);
delay_ms(100);
}
Init_RF12();
i = TRUE;
while(i){
ChkSum = 0;
spi_xfer(0x8228); //open PA (TX)
delay_us(4);
spi_xfer(0x8238); //synthesizer enabled
spi_xfer(0xAA); //syncronise
spi_xfer(0xAA);
spi_xfer(0xAA);
spi_xfer(0x2D);
spi_xfer(0xD4);
spi_xfer(0x30); //data 0
ChkSum += 0x30;
spi_xfer(0x31); //data 1
ChkSum += 0x31;
spi_xfer(0x32);
ChkSum += 0x32;
spi_xfer(0x33);
ChkSum += 0x33;
spi_xfer(0x34);
ChkSum += 0x34;
spi_xfer(0x35);
ChkSum += 0x35;
spi_xfer(0x36);
ChkSum += 0x36;
spi_xfer(0x37);
ChkSum += 0x37;
spi_xfer(0x38);
ChkSum += 0x38;
spi_xfer(0x39);
ChkSum += 0x39;
spi_xfer(0x3A);
ChkSum += 0x3A;
spi_xfer(0x3B);
ChkSum += 0x3B;
spi_xfer(0x3C);
ChkSum += 0x3C;
spi_xfer(0x3D);
ChkSum += 0x3D;
spi_xfer(0x3E);
ChkSum += 0x3E;
spi_xfer(0x3F); //data 15
ChkSum += 0x3F;
//ChkSum &= 0x0FF;
spi_xfer(ChkSum);
spi_xfer(0xAA);
spi_xfer(0x8208); //close PA (TX)
spi_xfer(0x8200); // ?
output_high(LED);
delay_ms(100);
output_low(LED);
delay_ms(1000);
//}
}
}
//************************************************************void Init_RF12(void){ //init TX
output_low(LED);
spi_xfer(0x80E8); //freq. band 868 Mhz, 12.5 pF
spi_xfer(0x8208); //turn on crystal !PA power management command
spi_xfer(0xA640); //freg. set, freg = 868 Mhz + 1600 * 0.005 Mhz = 876 Mhz
spi_xfer(0xC647); //bitrate 4800
//spi_xfer(0xCC77); //PLL setting command, default value look at page 7 or 0xCC67
spi_xfer(0xCC67); // 10 Mhz clock
spi_xfer(0x94A0); //VDI, FAST, 134 kHZ,0dBm -103 dBm (receiver control command ?)
spi_xfer(0xC2AC); //data filter command
spi_xfer(0xCA80); //FIFO and reset mode command
spi_xfer(0xCA83); //FIFO8, SYNC
spi_xfer(0xC49B); //AFC command
spi_xfer(0x9850); //!mp,9810 = 90 kHz, MAX OUT WRONG!
spi_xfer(0xE000); //WAKEUP TIMER , NOT USED
spi_xfer(0xC80E); //low duty cycle command, NOT USED
spi_xfer(0xC000); //1,0 Mhz, 2.2 V
}
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I have checked all the hardware with oscilloscope and I believe this is not hardware problem...
RFM12B use 3.3 volts and I have level converters for 3.3 V to 5 V
and 5 v to 3.3 V.
So if you can help me I'll be very pleased.
friendly regards here from Finland
-arto- |
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PCM programmer
Joined: 06 Sep 2003
Posts: 21708
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| Posted: Sun Sep 13, 2015 1:05 am |
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In your RX code, you setup #use spi() as a Master. But then in your code,
you call spi_xfer() without a parameter. If there's no parameter, it means no clock will be sent out the SCLK pin by the master. So, there
will be no communication with the RFM12B spi slave device. Add a
parameter of 0x0000.
I don't know what compiler version you're using, but if I try to compile
your code, which has no parameter for some of the spi_xfer() statements,
I get a few of these error messages:
| Quote: | | *** Error 51 "PCM_Test.c" Line 34(31,32): A numeric expression must appear here |
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artohautala
Joined: 17 Nov 2011
Posts: 187
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| Posted: Sun Sep 13, 2015 7:08 am |
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| PCM programmer wrote: | In your RX code, you setup #use spi() as a Master. But then in your code,
you call spi_xfer() without a parameter. If there's no parameter, it means no clock will be sent out the SCLK pin by the master. So, there
will be no communication with the RFM12B spi slave device. Add a
parameter of 0x0000. |
I don't know what compiler version you're using, but if I try to compile
your code, which has no parameter for some of the spi_xfer() statements,
I get a few of these error messages:
| Quote: | *** Error 51 "PCM_Test.c" Line 34(31,32): A numeric expression must appear here[
|
Thank's for your answer ...
my compiler version is rather old 4.018 ... and it compilers no warning no errors...
It seems to me that spi_xfer and
#use SPI(MODE don' work at all in this version because I can't start TX
to work at all ... (because there's no current from 3.3 V source)
Is it so that master DO must go to slave DI and master DI to slave DO ?
I have tried both but it do not work ...
I'll be happy if you have any idea to test ?
best regards
-arto- |
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PCM programmer
Joined: 06 Sep 2003
Posts: 21708
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| Posted: Mon Sep 14, 2015 5:24 pm |
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| Quote: |
It seems to me that spi_xfer and #use SPI(MODE) don't work at all in this version. |
It works, but needs some more coding.
I don't have a 16F73, so I used a 16F877. I made a test program and
compiled it with vs. 4.018. I looked at SCLK, SDO, and ENABLE with
an oscilloscope. I immediately saw that ENABLE defaults to high true.
That's because you have an older version of the compiler. On vs. 5.048,
ENABLE defaults to low-true, which is far more commonly used for SPI chips.
To fix it for your version, you need to add the parameter shown in bold below:
| Quote: |
#include <16F877.h>
#fuses HS,NOWDT,PUT
#use delay(clock = 10000000)
#use SPI(MASTER, BAUD = 4800, DI = PIN_B5, DO = PIN_B4, CLK = PIN_B3, ENABLE = PIN_B2, BITS = 16, ENABLE_ACTIVE=0)
//=================================
void main()
{
while(TRUE)
{
spi_xfer(0x8C3C);
delay_ms(1);
}
} |
Also, I would recommend that you get an oscilloscope. This type of
problem is quickly found with a scope. |
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