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main.c
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main.c
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/*
* VanStalk.c
*
* Created: 25.10.2015 20:23:05
* Author: George Lazarov
* email: lazarov.g@gmail.com
*/
#define F_CPU 16000000L
#include <avr/io.h>
#include <util/delay.h>
#include <avr/interrupt.h>
#define ROKE (1)
#define RNOKE (0)
#define MOTOROLA_MODE 0x00
#define WRITE 0xE0
#define READ 0x60
#define ADDR_ANSW 0xAA
#define CMD_ANSW 0x55
#define LINECONTROL 0x00 // r/w - 0x00
#define TRANSMITCTR 0x01 // r/w - 0x02
#define DIAGNCTRL 0x02 // r/w - 0x00
#define COMMANDREG 0x03 // w - 0x00
#define LINESTAT 0x04 // r - 0bx01xxx00
#define TRANSTAT 0x05 // r - 0x00
#define LASTMSGSTAT 0x06 // r - 0x00
#define LASTERRSTAT 0x07 // r - 0x00
#define INTSTATUS 0x09 // r - 0x80
#define INTENABLE 0x0A // r/w - 0x80
#define INTRESET 0x0B // w
// Channels
#define CHANNEL_ADDR( x) ( 0x10 + ( 0x08 * x))
#define CHANNELS 14
// Mailbox - data register
#define GETMAIL( x) ( 0x80 + x)
// Buttons
/* 7 6 5 4 3 2 1 0 */
/* su sd wu wd vu vd sr ? */
#define SRC 1
#define VDWN 2
#define VUP 3
#define WDWN 4
#define WUP 5
#define SDWN 6
#define SUP 7
#define CMD_WAIT_MS (50)
typedef unsigned char byte;
// Resistance references for MCP4100
const byte source = 0xfd; // 1.20 k
const byte att = 0xf8; // 3.50 k
const byte displ = 0xf1; // 5.75 k
const byte tup = 0xeb; // 8.00 k
const byte tdwn = 0xe2; // 11.25 k
const byte volup = 0xd5; // 16.00 k
const byte voldwn = 0xbe; // 24.00 k
const byte band = 0x4d; // 62.75 k
const byte nocmd = 0x00; // max
// Global variables
volatile int error = 0x00; // TSS463C out of sync error
volatile byte interr = 0x00;
// Button states
volatile byte oldwheel = 0x80;
volatile byte wheel = 0x80;
volatile byte button = 0x00;
volatile byte wuloop = 0x00;
volatile byte wdwnloop = 0x00;
// Functions declaration
byte spi_transfer( volatile byte data);
void tss_init();
void execCmd( const byte cmd);
void register_set( byte address, byte value);
byte register_get( byte address);
void motorolla_mode();
void setup()
{
TIMSK0 = 0;
DDRB |= (1 << DDB3) | (1 << DDB5) | (1 << DDB2) | (1 << DDB1) | ( 1 << DDB0);
PORTB |= ( 0 << PINB0);
PORTB |= ( 1 << PINB2);
SPCR = (1 << SPE) | (1 << MSTR) | (1 << CPOL) | (1 << CPHA);
byte clr = SPSR;
clr = SPDR;
(void)clr;
//_delay_ms( 10);
// Enable ATMega Interrupts on INT0
EICRA |= (1 << ISC01); // The falling edge of INT0 generates an interrupt request
EIMSK |= (1 << INT0); // Enable INT0
tss_init();
};
void tss_init()
{
motorolla_mode();
_delay_ms( 10);
// disable all channels
for ( int i = 0 ; i < CHANNELS ; i++)
{
register_set( CHANNEL_ADDR( i) + 3, 0x0F);
_delay_ms( 10);
}
// set Channel 0 to receive messages from ID 9C4
// and receive data in address 0x80
/*
ID_MASK 0x07 ID_M [3:0] x x x x
ID_MASK 0x06 ID_M [11:4]
(No register) 0x05 x x x x x x x x
(No register) 0x04 x x x x x x x x
MESS_L/STA 0x03 M_L [4:0] CHER CHTx CHRx
MESS_PTR 0x02 DRACK M_P [6:0]
ID_TAG/CMD 0x01 ID_T [3: 0] EXT RAK RNW RTR
ID_TAG 0x00 ID_T [11:4]
*/
register_set( CHANNEL_ADDR( 0) + 0, 0x9C); // ID_TAG 9C4 - Radio Control
register_set( CHANNEL_ADDR( 0) + 1, 0x41); // ID_TAG, RNW = 0, RTR = 1
register_set( CHANNEL_ADDR( 0) + 2, 0x00); // MESS_PTR 0 ( 0x80 + 0) - MAILBOX ADDRESS
register_set( CHANNEL_ADDR( 0) + 3, 0xf8); // M_L [4:0] = 0x1F Frame with 30 DATA bytes , CHER = 0, CHTx = 0, CHRx = 0
register_set( CHANNEL_ADDR( 0) + 6, 0x9C); // ID_MASK 9C4
register_set( CHANNEL_ADDR( 0) + 7, 0x40); // ID_MASK
register_set( LINECONTROL, 0x20); // Clock Divider 0010 - 0x02 ( TSCLK = XTAL1 / n * 16) or ( TSCLK = 16000000 / 2 * 16) or 500000
_delay_ms( 10);
register_set( TRANSMITCTR, 0x32); // MT: 0011 ( Maximum Retries = 0x03) VER 001 fixed
_delay_ms( 10);
// Enable TSS Interrupts
byte intEnable = 0x80; // Default value reset: 1xx0 0000
intEnable |= ( 1 << ROKE) | ( 1 << ROKE);
register_set( INTENABLE, intEnable);
_delay_ms( 10);
register_set( COMMANDREG, 0x10); // ACTI - activate line
_delay_ms( 10);
error = 0;
};
void execCmd( const byte cmd)
{
PORTB &= ~( 1 << PINB1);
spi_transfer( 0x11);
spi_transfer( cmd);
PORTB |= ( 1 << PINB1);
_delay_ms( CMD_WAIT_MS);
PORTB &= ~( 1 << PINB1);
spi_transfer( 0x11);
spi_transfer( nocmd);
PORTB |= ( 1 << PINB1);
};
void register_set( byte address, byte value)
{
byte res = 0;
PORTB &= ~( 1 << PINB2);
_delay_ms( 4);
res = spi_transfer( address);
if ( res != ADDR_ANSW)
error++;
_delay_ms( 8);
res = spi_transfer( WRITE);
if ( res != CMD_ANSW)
error++;
_delay_ms( 15);
spi_transfer( value);
_delay_ms( 12);
PORTB |= ( 1 << PINB2);
};
byte register_get( byte address)
{
byte value = 0;
PORTB &= ~( 1 << PINB2);
_delay_ms( 4);
value = spi_transfer( address);
if ( value != ADDR_ANSW)
error++;
_delay_ms( 8);
value = spi_transfer( READ);
if ( value != CMD_ANSW)
error++;
_delay_ms( 15);
value = spi_transfer( 0xff);
_delay_ms( 12);
PORTB |= ( 1 << PINB2);
return value;
};
void motorolla_mode()
{
byte value;
PORTB &= ~( 1 << PINB2);
_delay_ms( 4);
value = spi_transfer( MOTOROLA_MODE);
if ( value != ADDR_ANSW)
error++;
_delay_ms( 8);
value = spi_transfer( MOTOROLA_MODE);
if ( value != CMD_ANSW)
error++;
_delay_ms( 12);
PORTB |= ( 1 << PINB2);
};
byte spi_transfer( volatile byte data)
{
byte res;
SPDR = data;
while (!(SPSR & (1 << SPIF))) {};
res = SPDR;
return res;
};
int main(void)
{
setup();
sei();
while (1)
{
if( !error) {
button = register_get( GETMAIL( 1));
wheel = register_get( GETMAIL( 2));
if( wheel > oldwheel || wuloop != ( button & ( 1 << WUP))) {
wuloop = ( button & ( 1 << WUP));
oldwheel = wheel;
PORTB |= ( 1 << PINB0);
execCmd( tup);
PORTB &= ~( 1 << PINB0);
}
else if( wheel < oldwheel || wdwnloop != ( button & ( 1 << WDWN))) {
wdwnloop = ( button & ( 1 << WDWN));
oldwheel = wheel;
PORTB |= ( 1 << PINB0);
execCmd( tdwn);
PORTB &= ~( 1 << PINB0);
}
else if ( button & ( 1 << SRC)) {
execCmd( source);
}
else if ( ( button & ( 1 << VUP)) && ( button & ( 1 << VDWN))) {
execCmd( att);
}
else if ( button & ( 1 << VDWN)) {
execCmd( voldwn);
}
else if ( button & ( 1 << VUP)) {
execCmd( volup);
}
else if ( button & ( 1 << SDWN)) {
execCmd( tdwn);
}
else if ( button & ( 1 << SUP)) {
execCmd( tup);
}
register_set( CHANNEL_ADDR( 0) + 3, 0xf8);
}
else {
tss_init();
}
_delay_ms(10);
}
};
ISR(INT0_vect)
{
//interr = register_get( INTSTATUS);
//if( interr & ( 1 << ROKR) && interr & ( 1 << RNOKR))
//register_set( INTRESET, 0x83);
//inter |= ( 1 << 1) | (1 << 0);
//register_set( INTRESET, 0x00);
};