flywithu/Toyota-AVC-LAN
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Update to use attiny1616 AC2 and TCB1

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- Change AVC output enable/disable to only change input/output of pin 7;
  only one pin should need to be used to send (i.e. actual differential
  signaling isn't being used, therefore, we can achieve the necessary
  (single-ended) differential voltage using only one pin, leaving the
  other outputting low)
- Use virtual ports to enable setting output status with single
  instruction
This commit is contained in:
Allen Hill 2023-08-03 11:01:45 -04:00
parent 0a9bd4d988
commit feccda9e69
3 changed files with 67 additions and 95 deletions
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13
GlobalDef.h
View File

@ -18,14 +18,11 @@
#define FALSE 0
#define TRUE (!FALSE)
// AVC LAN bus directly connected to internal analog comparator (PD6/7)
// PD6 AIN0 +
// PD7 AIN1 -
#define DATAIN_PIN ACSR
#define DATAIN ACO
#define INPUT_IS_SET ( bit_is_set( DATAIN_PIN, DATAIN ) )
#define INPUT_IS_CLEAR ( bit_is_clear( DATAIN_PIN, DATAIN ) )
// AVC LAN bus on AC2 (PA6/7)
// PA6 AINP0 +
// PA7 AINN1 -
#define INPUT_IS_SET ( bit_is_set( AC2_STATUS, AC_STATE_bp ) )
#define INPUT_IS_CLEAR ( bit_is_clear( AC2_STATUS, AC_STATE_bp ) )
#define LED_DDR DDRB
#define LED_PORT PORTB

145
avclandrv.c
View File

@ -38,10 +38,12 @@
//------------------------------------------------------------------------------
#define AVC_OUT_EN() sbi(PORTD, 6); sbi(DDRD, 6); sbi(DDRD, 7); sbi(ACSR, ACD); // Write mode
#define AVC_OUT_DIS() cbi(PORTD, 6); cbi(DDRD, 6); cbi(DDRD, 7); cbi(ACSR, ACD); // Read mpde
#define AVC_SET_1() sbi(PORTD, 6);
#define AVC_SET_0() cbi(PORTD, 6);
#define AVC_OUT_EN() cbi(AC2_CTRLA, AC_ENABLE_bp); sbi(VPORTA_DIR, 6); // Write mode
#define AVC_OUT_DIS() cbi(VPORTA_DIR, 6); sbi(AC2_CTRLA, AC_ENABLE_bp); // Read mode
#define AVC_SET_LOGICAL_1() \
__asm__ __volatile__ ("sbi VPORTA_OUT, 6;");
#define AVC_SET_LOGICAL_0() \
__asm__ __volatile__ ("cbi VPORTA_OUT, 6;");
byte CD_ID_1;
@ -147,20 +149,20 @@ void AVC_HoldLine()
// wait for free line
byte line_busy = 1;
TCNT0 = 0;
TCB1.CNT = 0;
do {
while (INPUT_IS_CLEAR) {
/* The comparison value was originally 25 with CK64 (tick period of 4.34 us)
at a clock frequency 14.7456MHz.
For a more accurate tick period of .5 us at 16MHz, the value should be approximately 225*/
if (TCNT0 >= 225) break;
if (TCB1.CNT >= 900) break;
}
if (TCNT0 > 216) line_busy=0;
if (TCB1.CNT > 864) line_busy=0;
} while (line_busy);
// switch to out mode
AVC_OUT_EN();
AVC_SET_1();
AVC_SET_LOGICAL_1();
STARTEvent;
}
@ -169,7 +171,7 @@ void AVC_HoldLine()
//------------------------------------------------------------------------------
void AVC_ReleaseLine()
{
AVC_SET_0();
AVC_SET_LOGICAL_0();
AVC_OUT_DIS();
}
//------------------------------------------------------------------------------
@ -179,31 +181,21 @@ void AVC_ReleaseLine()
//------------------------------------------------------------------------------
void AVCLan_Init()
{
// OUTPUT ( set as input for comparator )
cbi(PORTD, 6);
cbi(DDRD, 6);
PORTA.PIN6CTRL = PORT_ISC_INPUT_DISABLE_gc; // Disable input buffer; recommended when using AC
PORTA.PIN7CTRL = PORT_ISC_INPUT_DISABLE_gc;
// Pull-ups are disabled by default
VPORTA.DIR &= ~(PIN6_bm | PIN7_bm); // Zero pin 6 and 7 to set as input
// INPUT
cbi(PORTD, 7);
cbi(DDRD, 7);
// Analog comparator
AC2.CTRLA = AC_OUTEN_bm | AC_HYSMODE_25mV_gc | AC_ENABLE_bm;
cbi(ADCSRB, ACME); // Analog Comparator Multiplexer Enable - NO
//cbi(ADCSRA, ADEN);
/*
cbi(ACSR, ACBG); // Analog Comparator Bandgap Select
// ACI: Analog Comparator Interrupt Flag
cbi(ACSR, ACIE); // Analog Comparator Interrupt Enable - NO
cbi(ACSR, ACIC); // Analog Comparator Input Capture Enable - NO
*/
cbi(ACSR, ACIS1); // Analog Comparator Interrupt Mode Select
cbi(ACSR, ACIS0); // Comparator Interrupt on Output Toggle
cbi(ACSR, ACD); // Analog Comparator Disable - NO
TCCR0B = _BV(CS01); // Timer 0 prescaler = 8 ( 2 count / us )
TCB1.CTRLB = TCB_ASYNC_bm | TCB_CNTMODE_SINGLE_gc;
TCB1.EVCTRL = TCB_CAPTEI_bm;
TCB1.INTCTRL = TCB_CAPT_bm;
EVSYS.ASYNCUSER0 = EVSYS_ASYNCUSER0_ASYNCCH0_gc;
TCB1.CTRLA = TCB_CLKSEL_CLKDIV2_gc | TCB_ENABLE_bm;
message_len = 0;
answerReq = cmNull;
@ -228,9 +220,9 @@ byte AVCLan_Read_Byte(byte length)
while (1) {
while (INPUT_IS_CLEAR);
TCNT0 = 0;
while (INPUT_IS_SET); // If input was set for less than a
if ( TCNT0 < 52 ) { // generous half period, bit was a 1
TCB1.CNT = 0;
while (INPUT_IS_SET); // If input was set for less than 26 us
if ( TCB1.CNT < 208 ) { // (a generous half period), bit was a 1
bite++;
parity_bit++;
}
@ -240,19 +232,24 @@ byte AVCLan_Read_Byte(byte length)
}
}
void set_AVC_logic_for(uint8_t val, uint16_t period) {
if (val == 1) {
AVC_SET_LOGICAL_1();
} else {
AVC_SET_LOGICAL_0();
}
TCB1.CCMP = period;
EVSYS.ASYNCSTROBE = EVSYS_ASYNCCH00_bm;
loop_until_bit_is_set(TCB1_INTFLAGS, 0);
TCB1_INTFLAGS = 1;
}
// DONE: Timing adjusted
//------------------------------------------------------------------------------
byte AVCLan_Send_StartBit()
{
AVC_SET_1();
TCNT0 = 0;
while( TCNT0 < 255 );
TCNT0 = 0;
while( TCNT0 < 77 );
AVC_SET_0();
TCNT0 = 0;
while( TCNT0 < 38 );
set_AVC_logic_for(1, 1328); // 166 us @ 125 ns tick (for F_CPU = 16MHz)
set_AVC_logic_for(0, 152); // 19 us @ 125 ns tick (for F_CPU = 16MHz)
return 1;
}
@ -261,69 +258,47 @@ byte AVCLan_Send_StartBit()
//------------------------------------------------------------------------------
void AVCLan_Send_Bit1()
{
AVC_SET_1();
TCNT0 = 0;
while( TCNT0 < 41 );
AVC_SET_0();
TCNT0 = 0;
while( TCNT0 < 38 ); // 12-21 us
set_AVC_logic_for(1, 164); // 20.5 us @ 125 ns tick (for F_CPU = 16MHz)
set_AVC_logic_for(0, 152); // 19 us @ 125 ns tick (for F_CPU = 16MHz)
}
// DONE: Timing adjusted
//------------------------------------------------------------------------------
void AVCLan_Send_Bit0()
{
AVC_SET_1();
TCNT0 = 0;
while( TCNT0 < 68 ); // 28-37 us
AVC_SET_0();
TCNT0 = 0;
while( TCNT0 < 11 ); // 00-09 us
set_AVC_logic_for(1, 272); // 34 us @ 125 ns tick (for F_CPU = 16MHz)
set_AVC_logic_for(0, 44); // 5.5 us @ 125 ns tick (for F_CPU = 16MHz)
}
// DONE: Timing adjusted.
//------------------------------------------------------------------------------
byte AVCLan_Read_ACK()
{
AVC_SET_1();
TCNT0 = 0;
while( TCNT0 < 38 );
AVC_SET_0(); // Replace with AVC_ReleaseLine?
set_AVC_logic_for(1, 152); // 34 us @ 125 ns tick (for F_CPU = 16MHz)
AVC_SET_LOGICAL_0(); // Replace with AVC_ReleaseLine?
AVC_OUT_DIS(); // switch to read mode
TCB1.CNT = 0;
while(1) {
if (INPUT_IS_SET && (TCNT0 > 52 )) break; // Make sure INPUT is not still set from us
if (INPUT_IS_SET && (TCB1.CNT > 208 )) break; // Make sure INPUT is not still set from us
// Line of experimentation: Try changing TCNT0 comparison value or remove check entirely
if (TCNT0 > 75 ) return 1; // Not sure if this fix is intent correct
if (TCB1.CNT > 300 ) return 1; // Not sure if this fix is intent correct
}
while(INPUT_IS_SET);
AVC_OUT_EN(); // back to write mode
return 0;
}
// DONE: Timing adjusted.
//------------------------------------------------------------------------------
byte AVCLan_Send_ACK()
{
TCNT0 = 0;
TCB1.CNT = 0;
while (INPUT_IS_CLEAR) {
if (TCNT0 >= 225) return 0; // max wait time
if (TCB1.CNT >= 900) return 0; // max wait time
}
AVC_OUT_EN();
AVC_SET_1();
TCNT0 = 0;
while( TCNT0 < 68 ); //28-37
AVC_SET_0();
TCNT0 = 0;
while( TCNT0 < 11 ); //00-09
set_AVC_logic_for(1, 272); // 34 us @ 125 ns tick (for F_CPU = 16MHz)
set_AVC_logic_for(0, 44); // 5.5 us @ 125 ns tick (for F_CPU = 16MHz)
AVC_OUT_DIS();
@ -533,12 +508,12 @@ byte AVCLan_SendData()
// wait for free line
byte line_busy = 1;
TCNT0 = 0;
TCB1.CNT = 0;
do {
while (INPUT_IS_CLEAR) {
if ( TCNT0 >= 225 ) break;
if ( TCB1.CNT >= 900 ) break;
}
if ( TCNT0 > 216 ) line_busy=0;
if ( TCB1.CNT > 864 ) line_busy=0;
} while (line_busy);
@ -617,12 +592,12 @@ byte AVCLan_SendDataBroadcast()
// wait for free line
byte line_busy = 1;
TCNT0 = 0;
TCB1.CNT = 0;
do {
while (INPUT_IS_CLEAR) {
if ( TCNT0 >= 225 ) break;
if ( TCB1.CNT >= 900 ) break;
}
if ( TCNT0 > 216 ) line_busy=0;
if ( TCB1.CNT > 864 ) line_busy=0;
} while (line_busy);
@ -1025,10 +1000,10 @@ void ShowOutMessage()
sbi(TCCR1B, CS10);
word n = 60000;
TCNT1 = 0;
AVC_SET_1();
AVC_SET_LOGICAL_1();
while ( TCNT1 < n );
TCNT1 = 0;
AVC_SET_0();
AVC_SET_LOGICAL_0();
while ( TCNT1 < n );
cbi(TCCR1B, CS10);
AVC_OUT_DIS();

4
sniffer.c
View File

@ -119,8 +119,8 @@ int main()
break;
case 'R': RS232_Print_P(PSTR("REGIST:\n"));
AVCLan_Command( cmRegister );
TCNT0 = 0;
while( TCNT0 < 135 );
TCB1.CNT = 0;
while( TCB1.CNT < 540 );
CHECK_AVC_LINE;
break;
case 'r': AVCLan_Register();