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Secersh
Joined: 19 Oct 2009
Posts: 8
Location: Serbia, Belgrade
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| TDA7314 audio processor i2c help |
 Posted: Sun Dec 26, 2010 5:56 am |
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Hi, i used TDA7314 and PIC16F876a width encoder and 4*20 char LCD as volume/tone control for my amp, and am having trouble width TDA(http://www.datasheetcatalog.org/datasheet/stmicroelectronics/1487.pdf), i think that the problem is i2c, here is the code...thanks in advance...
| Code: | #include "C:\Documents and Settings\Cersik\My Documents\Amp\Amp.h"
#define LCD_ENABLE_PIN PIN_B0
#define LCD_RS_PIN PIN_B1
#define LCD_RW_PIN PIN_B2
#include <lcd420.c>
#use I2C(master,slow,sda=PIN_C4,scl=PIN_C3)
signed value1=30;
signed value2=7;
signed value3=7;
int newencoder;
int lastencoder;
signed vol=-63;
signed bastre[15]={-14,-12,-10,-8,-6,-4,-2,0,2,4,6,8,10,12,14};
int bas[15]={96,97,98,99,100,101,102,103,110,109,108,107,106,105,104};
int tre[15]={112,113,114,115,116,117,118,119,126,125,124,123,122,121,120};
int sel=0;
int pos1=8;
int i;
void lcd_load_custom_chars(void);
void main()
{
lcd_init();
lcd_load_custom_chars();
printf(lcd_putc "\f\n Welcome\003");
delay_ms(2000);
while(1){
printf(lcd_putc "\f");
lcd_gotoxy(1,1);
for(i=0;i<20;i++){
lcd_putc(0);}
printf(lcd_putc "\n Volume %ddb",vol);
printf(lcd_putc "\n Bass %ddb",bastre[value2]);
printf(lcd_putc "\n Treble %ddb",bastre[value3]);
delay_ms(150);
if(input(pin_c5)==0){
sel++;
if(sel>2)
sel=0;}
if(sel==0){
lcd_gotoxy(1,2);
lcd_putc(2);
lcd_gotoxy(1,1);
pos1=(63-value1)/3;
if(pos1>19)
pos1=20;
for(i=0;i<pos1;i++){
lcd_putc(1);}
newencoder = (input_c() & 0b00000110);
if(newencoder != lastencoder){
if (bit_test(newencoder,2) == bit_test(lastencoder,1))
value1++; else value1--;
lastencoder = newencoder;
delay_ms(25);}
if(value1<0)
value1=0;
if(value1>63)
value1=63;
vol=-(value1);
}
if(sel==1){
lcd_gotoxy(1,3);
lcd_putc(2);
pos1=value2+3;
lcd_gotoxy(pos1,1);
lcd_putc(1);
lcd_putc(1);
newencoder = (input_c() & 0b00000110);
if(newencoder != lastencoder){
if (bit_test(newencoder,2) == bit_test(lastencoder,1))
value2++; else value2--;
lastencoder = newencoder;
delay_ms(25);}
if(value2<0)
value2=0;
if(value2>14)
value2=14;
}
if(sel==2){
lcd_gotoxy(1,4);
lcd_putc(2);
pos1=value3+3;
lcd_gotoxy(pos1,1);
lcd_putc(1);
lcd_putc(1);
newencoder = (input_c() & 0b00000110);
if(newencoder != lastencoder){
if (bit_test(newencoder,2) == bit_test(lastencoder,1))
value3++; else value3--;
lastencoder = newencoder;
delay_ms(25);}
if(value3<0)
value3=0;
if(value3>14)
value3=14;
}
delay_ms(500);
i2c_start();
i2c_write(0x88);
i2c_write(value1);
i2c_write(bas[value2]);
i2c_write(tre[value3]);
i2c_stop();
delay_ms(10);}
}
const int8 lcd_custom_chars[] ={159,128,128,128,128,128,128,159,159,128,159,159,159,159,128,159,132,134,133,133,132,132,156,156,131,141,139,141,137,139,155,152};
void lcd_load_custom_chars(void)
{
int8 i;
// Set address counter pointing to CGRAM address 0.
lcd_send_byte(0, 0x40);
// Load custom lcd character data into CGRAM.
// It can only hold a maximum of 8 custom characters.
for(i = 0; i < sizeof(lcd_custom_chars); i++)
{
lcd_send_byte(1, lcd_custom_chars[i]);
}
// Set address counter pointing back to the DDRAM.
lcd_send_byte(0, 0x80);
} |
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temtronic
Joined: 01 Jul 2010
Posts: 9241
Location: Greensville,Ontario
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| Posted: Sun Dec 26, 2010 6:16 am |
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hardware ?
do you have the correct pullup resistors on the I2C bus?
do you have the device on the correct pins(and not reversed !)?
software ?
you seem to have a lot of IF statements 'in a row'
Any chance you're skipping over the I2C code section due to a wrongly construced IF -Else section ? I try to indent every nested IF... to better show the 'flow' of the code.
Have you tried a small I2C function just to write and read the I2C device without the encoder code? |
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Secersh
Joined: 19 Oct 2009
Posts: 8
Location: Serbia, Belgrade
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| Posted: Sun Dec 26, 2010 6:26 am |
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| Solved it, i just wrote all 8 data bytes instead of 3 to the TDA...thanks for reply... |
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temtronic
Joined: 01 Jul 2010
Posts: 9241
Location: Greensville,Ontario
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| Posted: Sun Dec 26, 2010 7:07 am |
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Yup, I read the data sheet and while it doesn't SAY that all 8 bytes have to be sent....the 'data train' of start...address..data...stop bits would INDICATE that all 8 need to be sent..
So you'll have to send all 8 bytes, even though you might just want to increase the bass.
Happy you got it to work,looks like a nice project ! |
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Secersh
Joined: 19 Oct 2009
Posts: 8
Location: Serbia, Belgrade
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| Posted: Sun Dec 26, 2010 8:29 am |
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I hope it will be done by tomorrow, maybe some pics...  |
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jruibarroso
Joined: 07 Jan 2006
Posts: 64
Location: Braga
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| Posted: Wed May 18, 2011 2:49 am |
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| can you post your corrected code ? |
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