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davey
Joined: 04 May 2006
Posts: 17
Location: Sweden
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| i2c...arrgghh....help!!! |
 Posted: Mon May 08, 2006 6:51 am |
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Hi can someone please take a look at my code before I totally lose it over here:
What I want to is: send two bytes of data from a master-PIC to a slave-PIC. Nothing more. I�ve tried looking at some examples but it just doesn�t work.
Hopefully you can see what belongs to i2c and not. The master uses send_to_slave() to send the two bytes, The slave uses an interrupt-routine to receive them. What am I doing wrong?
MASTER-code:
================
| Code: | #include <puls.H>
#fuses NOWDT
#use i2c(master,sda=PIN_C4,scl=PIN_C3)
int16 freq=20; //aktuell frekvens f�r mastern
int8 step=1; //Vald steg-niv� (1-4)
int8 channel=1; //Vald kanal (1-3)
byte pressed=0; //nedtryckt tangent
byte tmp4; //anv av lcd_write_as_hex
byte tmp3; //anv av timer1_isr()
byte tmp2; //anv av lcd_info()
byte tmp1;
int16 temp;
int16 temp2=0;
int16 temp3=0;
boolean write_zero=false;
struct lcd_map
{
int data:8;
boolean rs;
boolean enable;
boolean rw;
int unused:5;
}
lcd;
#byte lcd = 0x08
//CPU1 - Timer 1
int16 t1sv=3035; //Start-v�rde (65535-3035=62500) f�r Timer1 (ger 20Hz)
int16 t1svmod;
//F�r de andra processorerna
int16 freq2=20; //frekvens - CPU2
int8 step2=4; //stegniv� - CPU2
int16 freq3=20; //frekvens - CPU3
int8 step3=1; //stegniv� - CPU3
//(((((((((((((((((((((((( INTERRUPTS ))))))))))))))))))))))))))))
#int_timer1 //KANAL 1
timer1_isr()
{
tmp3=TIMER1_CTRL;
TIMER1_CTRL=0x00;
t1svmod=t1sv;
TIMER_1_LOW=t1svmod&0x00FF; //laddar med den f�rsta byten av t1sv
t1svmod >>= 8; //shiftar 8 bitar till h�ger
TIMER_1_HIGH=t1svmod&0x00FF;//laddar med den andra byten av t1sv
port_c ^= 1; //0->1 el. 1->0
TIMER1_CTRL=tmp3;
}
//%%%%%%%%%%%%%%%%%%%%%%%% FUNKTIONER %%%%%%%%%%%%%%%%%%%%%%%%%%%%
byte keyboard_in() //en funktion som kollar vilken knapp som �r intryckt och returnerar motsvarande v�rde
{
set_tris_b(0xF0); //v�ljer de f�rsta �tta benen p� port_b som ing�ngar, vilket g�r att de interna pull_up-most�nden kopplas hit
port_b_pullups(true); //drar upp pull_up-motst�nden till ettor
port_b = 0x0E; //aktiverar f�rsta kolumnen f�r att sedan f�rs�ka hitta den knapp som �r nedtryckt genom bit-testing...
if(!bit_test (port_b,7))
return 3; //betyder att knapp 3 �r nedtryckt -> avsluta intruktionen och returnera v�rdet 3
if(!bit_test (port_b,4))
return 0;
if(!bit_test (port_b,5))
return 1;
if(!bit_test (port_b,6))
return 2;
port_b = 0x0D; //se ovan
if(!bit_test (port_b,7))
return 7;
if(!bit_test (port_b,4))
return 4;
if(!bit_test (port_b,5))
return 5;
if(!bit_test (port_b,6))
return 6;
port_b = 0x0B; //se ovan
if(!bit_test (port_b,7))
return 11;
if(!bit_test (port_b,4))
return 8;
if(!bit_test (port_b,5))
return 9;
if(!bit_test (port_b,6))
return 10;
port_b = 0x07; //se ovan
if(!bit_test (port_b,7))
return 15;
if(!bit_test (port_b,4))
return 12;
if(!bit_test (port_b,5))
return 13;
if(!bit_test (port_b,6))
return 14;
}
void lcd_waitbusy()
{
set_tris_d(0xFF);
lcd.rw = true;
while(1)
{
delay_us(50);
if(bit_test(lcd.data,7)==0)
{
set_tris_d(0x00);
lcd.rw = false;
return;
}
}
}
void lcd_control(byte ctrl_in)
{
lcd_waitbusy();
lcd.rs=false;
lcd.rw=false;
lcd.data = ctrl_in;
lcd.enable=true;
delay_cycles(4);
lcd.enable=false;
delay_ms(2);
lcd.data = 0x00;
}
void lcd_data(byte data_in)
{
lcd_waitbusy();
lcd.rs=true;
lcd_waitbusy();
lcd.data=data_in;
lcd.enable=true;
delay_cycles(4);
lcd.enable=false;
delay_ms(2);
lcd.data = 0x00;
}
void lcd_write_as_hex(byte b) //funktion som skriver ut en byte i hex-form
{
tmp4=b>>4;
if(tmp4>9)
lcd_data(tmp4+0x37);
else
lcd_data(tmp4+0x30);
tmp4=b&0xF;
if(tmp4>9)
lcd_data(tmp4+0x37);
else
lcd_data(tmp4+0x30);
}
void calc_write_freq() //skriver ut frekvens p� LCD:n
{
switch(channel)
{
case 1:
temp2=freq;
break;
case 2:
temp2=freq2;
break;
case 3:
temp2=freq3;
break;
}
temp3=temp2/1000;
if(temp3>0)
{
write_zero=true;
lcd_data(temp3+0x30);
temp3=temp3*1000;
temp2=temp2-temp3;
}
temp3=temp2/100;
if(temp3>0 || write_zero)
{
lcd_data(temp3+0x30);
write_zero=true;
temp3=temp3*100;
temp2=temp2-temp3;
}
temp3=temp2/10;
if(temp3>0 || write_zero)
{
lcd_data(temp3+0x30);
temp3=temp3*10;
temp3=temp2-temp3;
}
write_zero=false;
lcd_data(temp3+0x30);
lcd_data(' ');
lcd_data('H');
lcd_data('z');
}
void info_lcd() //Skriver ut vald kanal, stegniv� och frekvens till LCD:n
{
lcd_control(0x01);
lcd_data('K');
lcd_data('a');
lcd_data('n');
lcd_data('a');
lcd_data('l');
lcd_data(':');
lcd_write_as_hex(channel);
lcd_data(' ');
lcd_data('S');
lcd_data('t');
lcd_data('e');
lcd_data('g');
lcd_data(':');
switch(channel)
{
case 1:
lcd_write_as_hex(step);
break;
case 2:
lcd_write_as_hex(step2);
break;
case 3:
lcd_write_as_hex(step3);
break;
}
lcd_control(0x41 + 0x80);
lcd_data('F');
lcd_data('r');
lcd_data('e');
lcd_data('k');
lcd_data('v');
lcd_data('e');
lcd_data('n');
lcd_data('s');
lcd_data(':');
calc_write_freq();
}
void send_to_slave() //I2C-funktion
{
switch(channel)
{
case 2: //skicka till slav-1
i2c_start();
i2c_write(0xa0); //adress
i2c_write(freq2>>8); //data
i2c_write(freq2&0x00FF);
i2c_stop();
break;
case 3: //skicka till slav-2
i2c_start();
i2c_write(0x50); //adress
i2c_write(freq3>>8); //data
i2c_write(freq3&0x00FF);
i2c_stop();
break;
default:
break;
}
}
//������������������������������������������������������������������������������
//������������������������������������ MAIN ������������������������������������
//������������������������������������������������������������������������������
main()
{
setup_counters(RTCC_INTERNAL,RTCC_DIV_2);
setup_port_a(NO_ANALOGS);
setup_adc(ADC_CLOCK_INTERNAL);
setup_psp(PSP_DISABLED);
setup_ccp1(CCP_OFF);
setup_ccp2(CCP_OFF);
setup_spi(spi_master | SPI_L_TO_H | spi_clk_div_4);
//====================== I/O ============================
set_tris_e(0x00); // PORT-E: alla utg�ngar
set_tris_d(0x00); // PORT-D: alla utg�ngar
set_tris_c(0x00); // PORT-C: alla utg�ngar
//=======================================================
//================== SETUP - Timer1 =====================
enable_interrupts(INT_TIMER1);
enable_interrupts(GLOBAL);
TIMER1_CTRL=0x11;
//=======================================================
//=================== SETUP - LCD =======================
lcd_control(0x38);
lcd_control(0x06);
lcd_control(0x0C);
lcd_control(0x01);
info_lcd();
//=======================================================
while(1)
{
pressed=keyboard_in();
//UPP
if(pressed==1)
{
pressed=0;
switch(channel)
{
case 1:
if(step==4 || freq>7000) freq=freq+200;
else if(step==3 || freq>6000) freq=freq+100;
else if(step==2 || freq>5000) freq=freq+50;
else freq=freq+5;
if(freq>13000) freq=13000;
//................................
if(freq>40 && TIMER1_CTRL==0x11) TIMER1_CTRL=0x01;
temp=2*freq;
if(TIMER1_CTRL==0x11) temp=2495000/temp;
else temp=4990000/temp;
t1sv=65535-temp;
break;
case 2:
if(step2==4 || freq2>7000) freq2=freq2+200;
else if(step2==3 || freq2>6000) freq2=freq2+100;
else if(step2==2 || freq2>5000) freq2=freq2+50;
else freq2=freq2+5;
if(freq2>13000) freq2=13000;
send_to_slave();
break;
case 3:
if(step3==4 || freq3>7000) freq3=freq3+200;
else if(step3==3 || freq3>6000) freq3=freq3+100;
else if(step3==2 || freq3>5000) freq3=freq3+50;
else freq3=freq3+5;
if(freq3>13000) freq3=13000;
send_to_slave();
break;
}
info_lcd();
delay_ms(500);
}
//NER
if(pressed==2)
{
pressed=0;
switch(channel)
{
case 1:
if(step==4 || freq>7000) freq=freq-200;
else if(step==3 || freq>6000) freq=freq-100;
else if(step==2 || freq>5000) freq=freq-50;
else freq=freq-5;
if(freq<20) freq=20;
//.....................................
if(freq<=40 && TIMER1_CTRL==0x01) TIMER1_CTRL=0x11;
temp=2*freq;
if(TIMER1_CTRL==0x11) temp=2495000/temp;
else temp=4990000/temp;
t1sv=65535-temp;
break;
case 2:
if(step2==4 || freq2>7000) freq2=freq2-200;
else if(step2==3 || freq2>6000) freq2=freq2-100;
else if(step2==2 || freq2>5000) freq2=freq2-50;
else freq2=freq2-5;
if(freq2<20) freq2=20;
send_to_slave();
break;
case 3:
if(step3==4 || freq3>7000) freq3=freq3-200;
else if(step3==3 || freq3>6000) freq3=freq3-100;
else if(step3==2 || freq3>5000) freq3=freq3-50;
else freq3=freq3-5;
if(freq3<20) freq3=20;
send_to_slave();
break;
}
info_lcd();
delay_ms(500);
}
//STEP
if(pressed==5)
{
switch(channel)
{
case 1:
step++;
if(step>4) step=1;
break;
case 2:
step2++;
if(step2>4) step2=1;
break;
case 3:
step3++;
if(step3>4) step3=1;
break;
}
info_lcd();
delay_ms(500);
}
//KANAL
if(pressed==4)
{
channel++;
if(channel>3) channel=1;
info_lcd();
delay_ms(500);
}
}
}
//������������������������������������������������������������������������������ |
SLAVE-code:
============
| Code: | #include <puls.H>
#fuses HS,NOWDT,NOPROTECT
#use i2c(slave,sda=PIN_C4,scl=PIN_C3,address=0xa0)
int16 freq=20; //aktuell frekvens f�r denna slav
int16 freq_tmp=20;
int16 temp;
byte tmp3; //anv av timer1_isr()
byte received;
typedef enum {FIRST_READ, LAST_READ} I2C_STATE;
I2C_STATE i2c_status=FIRST_READ;
//Timer 1
int16 t1sv=3035; //Start-v�rde (65535-3035=62500) f�r Timer1 (ger 20Hz)
int16 t1svmod;
//(((((((((((((((((((((((( INTERRUPTS ))))))))))))))))))))))))))))
#int_timer1 //KANAL 1
timer1_isr()
{
tmp3=TIMER1_CTRL;
TIMER1_CTRL=0x00;
t1svmod=t1sv;
TIMER_1_LOW=t1svmod&0x00FF; //laddar med den f�rsta byten av t1sv
t1svmod >>= 8; //shiftar 8 bitar till h�ger
TIMER_1_HIGH=t1svmod&0x00FF;//laddar med den andra byten av t1sv
port_c ^= 1; //0->1 el. 1->0
TIMER1_CTRL=tmp3;
}
#int_ssp
receive_isr()
{
//ladda freq med mottaget v�rde
if(i2c_poll())
{
if(i2c_status==FIRST_READ)
{
received=i2c_read();
freq_tmp=received;
i2c_status=LAST_READ;
}
else if(i2c_status==LAST_READ)
{
received=i2c_read();
freq_tmp=(freq_tmp<<8)&0xFF00;
freq_tmp=freq_tmp+received;
i2c_status=FIRST_READ;
freq=freq_tmp;
if(freq>40) TIMER1_CTRL=0x01;
else TIMER1_CTRL=0x11;
temp=2*freq;
if(TIMER1_CTRL==0x11) temp=2495000/temp;
else temp=4990000/temp;
t1sv=65535-temp;
}
port_d ^= 1; //indikator
}
}
//������������������������������������������������������������������������������
//������������������������������������ MAIN ������������������������������������
//������������������������������������������������������������������������������
main()
{
setup_counters(RTCC_INTERNAL,RTCC_DIV_2);
setup_port_a(NO_ANALOGS);
setup_adc(ADC_CLOCK_INTERNAL);
setup_psp(PSP_DISABLED);
setup_ccp1(CCP_OFF);
setup_ccp2(CCP_OFF);
setup_spi(spi_slave | SPI_L_TO_H | SPI_SS_DISABLED);
//====================== I/O ============================
set_tris_d(0x00); // PORT-D: alla utg�ngar
set_tris_c(0xFE); // PORT-C: alla ing�ngar, utom C0(puls)
//=======================================================
//========================I2C============================
enable_interrupts(INT_SSP);
//=======================================================
//================== SETUP - Timer1 =====================
enable_interrupts(INT_TIMER1);
enable_interrupts(GLOBAL);
TIMER1_CTRL=0x11;
//=======================================================
while(1){};
}
//������������������������������������������������������������������������������
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asmallri
Joined: 12 Aug 2004
Posts: 1635
Location: Perth, Australia
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| Posted: Mon May 08, 2006 9:08 am |
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Your more likley to get assisatance is you post the minimal code necessary to demonstrate the problem. Not many have the time to debug someone elses long code listing.
_________________
Regards, Andrew
http://www.brushelectronics.com/software
Home of Ethernet, SD card and Encrypted Serial Bootloaders for PICs!! |
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new2pic
Joined: 02 May 2006
Posts: 16
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| Posted: Mon May 08, 2006 11:18 am |
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i dont know if this helps but this works for me:
SEN = 1;
while(comm_not_finished);
bit comm_not_finished (data passed to function)
while(!SSPIF);
SSPIF = 0;
switch (x)
{
case 0:
SSPBUF = <insert data1>;
x = 1;
break;
case 1:
if (ACKSTAT) {
x = 0;
SEN = 1;
break;
}
SSPBUF = <insert data2>;
x = 2;
break;
case 2:
if (ACKSTAT)
{
x = 0;
SEN = 1;
break;
}
PEN = 1;
x = 3;
break;
case 3:
x = 0;
return 1;
}
return FALSE;
} |
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ckielstra
Joined: 18 Mar 2004
Posts: 3680
Location: The Netherlands
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| Posted: Mon May 08, 2006 12:51 pm |
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A huge listing and not even complete, puls.h is missing.
I can't find some #fuse settings and the #device setting, are these in the missing puls.h file?
| Code: | | setup_spi(spi_slave | SPI_L_TO_H | SPI_SS_DISABLED); |
You are using I2C, not SPI. This line seems tricky to me and I would remove it.
Sorry, I'm too lazy to study the rest of your huge program.
Have a look at ex_slave.c in the examples directory for how CCS sets up an I2C slave. |
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