@ -41,113 +41,11 @@
/** Flag to indicate if the USART is currently in Tx or Rx mode. */
volatile bool IsSending ;
# if !defined(XPROG_VIA_HARDWARE_USART)
/** Software USART raw frame bits for transmission/reception. */
volatile uint16_t SoftUSART_Data ;
/** Bits remaining to be sent or received via the software USART - set as a GPIOR for speed. */
# define SoftUSART_BitCount GPIOR2
/** ISR to manage the PDI software USART when bit-banged PDI USART mode is selected. */
ISR ( TIMER1_COMPA_vect , ISR_BLOCK )
{
/* Toggle CLOCK pin in a single cycle (see AVR datasheet) */
BITBANG_PDICLOCK_PIN = BITBANG_PDICLOCK_MASK ;
/* If not sending or receiving, just exit */
if ( ! ( SoftUSART_BitCount ) )
return ;
/* Check to see if we are at a rising or falling edge of the clock */
if ( BITBANG_PDICLOCK_PORT & BITBANG_PDICLOCK_MASK )
{
/* If at rising clock edge and we are in send mode, abort */
if ( IsSending )
return ;
/* Wait for the start bit when receiving */
if ( ( SoftUSART_BitCount = = BITS_IN_USART_FRAME ) & & ( BITBANG_PDIDATA_PIN & BITBANG_PDIDATA_MASK ) )
return ;
/* Shift in the bit one less than the frame size in position, so that the start bit will eventually
* be discarded leaving the data to be byte - aligned for quick access ( subtract 9 as we are ORing to the MSB ) */
if ( BITBANG_PDIDATA_PIN & BITBANG_PDIDATA_MASK )
( ( uint8_t * ) & SoftUSART_Data ) [ 1 ] | = ( 1 < < ( BITS_IN_USART_FRAME - 9 ) ) ;
SoftUSART_Data > > = 1 ;
SoftUSART_BitCount - - ;
}
else
{
/* If at falling clock edge and we are in receive mode, abort */
if ( ! IsSending )
return ;
/* Set the data line to the next bit value */
if ( ( ( uint8_t * ) & SoftUSART_Data ) [ 0 ] & 0x01 )
BITBANG_PDIDATA_PORT | = BITBANG_PDIDATA_MASK ;
else
BITBANG_PDIDATA_PORT & = ~ BITBANG_PDIDATA_MASK ;
SoftUSART_Data > > = 1 ;
SoftUSART_BitCount - - ;
}
}
/** ISR to manage the TPI software USART when bit-banged TPI USART mode is selected. */
ISR ( TIMER1_CAPT_vect , ISR_BLOCK )
{
/* Toggle CLOCK pin in a single cycle (see AVR datasheet) */
BITBANG_TPICLOCK_PIN = BITBANG_TPICLOCK_MASK ;
/* If not sending or receiving, just exit */
if ( ! ( SoftUSART_BitCount ) )
return ;
/* Check to see if we are at a rising or falling edge of the clock */
if ( BITBANG_TPICLOCK_PORT & BITBANG_TPICLOCK_MASK )
{
/* If at rising clock edge and we are in send mode, abort */
if ( IsSending )
return ;
/* Wait for the start bit when receiving */
if ( ( SoftUSART_BitCount = = BITS_IN_USART_FRAME ) & & ( BITBANG_TPIDATA_PIN & BITBANG_TPIDATA_MASK ) )
return ;
/* Shift in the bit one less than the frame size in position, so that the start bit will eventually
* be discarded leaving the data to be byte - aligned for quick access ( subtract 9 as we are ORing to the MSB ) */
if ( BITBANG_TPIDATA_PIN & BITBANG_TPIDATA_MASK )
( ( uint8_t * ) & SoftUSART_Data ) [ 1 ] | = ( 1 < < ( BITS_IN_USART_FRAME - 9 ) ) ;
SoftUSART_Data > > = 1 ;
SoftUSART_BitCount - - ;
}
else
{
/* If at falling clock edge and we are in receive mode, abort */
if ( ! IsSending )
return ;
/* Set the data line to the next bit value */
if ( ( ( uint8_t * ) & SoftUSART_Data ) [ 0 ] & 0x01 )
BITBANG_TPIDATA_PORT | = BITBANG_TPIDATA_MASK ;
else
BITBANG_TPIDATA_PORT & = ~ BITBANG_TPIDATA_MASK ;
SoftUSART_Data > > = 1 ;
SoftUSART_BitCount - - ;
}
}
# endif
/** Enables the target's PDI interface, holding the target in reset until PDI mode is exited. */
void XPROGTarget_EnableTargetPDI ( void )
{
IsSending = false ;
# if defined(XPROG_VIA_HARDWARE_USART)
/* Set Tx and XCK as outputs, Rx as input */
DDRD | = ( 1 < < 5 ) | ( 1 < < 3 ) ;
DDRD & = ~ ( 1 < < 2 ) ;
@ -160,24 +58,6 @@ void XPROGTarget_EnableTargetPDI(void)
UBRR1 = ( F_CPU / XPROG_HARDWARE_SPEED ) ;
UCSR1B = ( 1 < < TXEN1 ) ;
UCSR1C = ( 1 < < UMSEL10 ) | ( 1 < < UPM11 ) | ( 1 < < USBS1 ) | ( 1 < < UCSZ11 ) | ( 1 < < UCSZ10 ) | ( 1 < < UCPOL1 ) ;
# else
/* Set DATA and CLOCK lines to outputs */
BITBANG_PDIDATA_DDR | = BITBANG_PDIDATA_MASK ;
BITBANG_PDICLOCK_DDR | = BITBANG_PDICLOCK_MASK ;
/* Set DATA line low for at least 1ms to ensure that the device is ready for PDI mode to be entered */
BITBANG_PDIDATA_PORT & = ~ BITBANG_PDIDATA_MASK ;
_delay_ms ( 1 ) ;
/* Set DATA line high for at least 90ns to disable /RESET functionality */
BITBANG_PDIDATA_PORT | = BITBANG_PDIDATA_MASK ;
_delay_us ( 1 ) ;
/* Fire timer compare channel A ISR to manage the software USART */
OCR1A = BITS_BETWEEN_USART_CLOCKS ;
TCCR1B = ( 1 < < WGM12 ) | ( 1 < < CS10 ) ;
TIMSK1 = ( 1 < < OCIE1A ) ;
# endif
/* Send two BREAKs of 12 bits each to enable PDI interface (need at least 16 idle bits) */
XPROGTarget_SendBreak ( ) ;
@ -194,7 +74,6 @@ void XPROGTarget_EnableTargetTPI(void)
AUX_LINE_PORT & = ~ AUX_LINE_MASK ;
_delay_us ( 1 ) ;
# if defined(XPROG_VIA_HARDWARE_USART)
/* Set Tx and XCK as outputs, Rx as input */
DDRD | = ( 1 < < 5 ) | ( 1 < < 3 ) ;
DDRD & = ~ ( 1 < < 2 ) ;
@ -203,19 +82,6 @@ void XPROGTarget_EnableTargetTPI(void)
UBRR1 = ( F_CPU / XPROG_HARDWARE_SPEED ) ;
UCSR1B = ( 1 < < TXEN1 ) ;
UCSR1C = ( 1 < < UMSEL10 ) | ( 1 < < UPM11 ) | ( 1 < < USBS1 ) | ( 1 < < UCSZ11 ) | ( 1 < < UCSZ10 ) | ( 1 < < UCPOL1 ) ;
# else
/* Set DATA and CLOCK lines to outputs */
BITBANG_TPIDATA_DDR | = BITBANG_TPIDATA_MASK ;
BITBANG_TPICLOCK_DDR | = BITBANG_TPICLOCK_MASK ;
/* Set DATA line high for idle state */
BITBANG_TPIDATA_PORT | = BITBANG_TPIDATA_MASK ;
/* Fire timer capture channel ISR to manage the software USART */
ICR1 = BITS_BETWEEN_USART_CLOCKS ;
TCCR1B = ( 1 < < WGM13 ) | ( 1 < < WGM12 ) | ( 1 < < CS10 ) ;
TIMSK1 = ( 1 < < ICIE1 ) ;
# endif
/* Send two BREAKs of 12 bits each to enable TPI interface (need at least 16 idle bits) */
XPROGTarget_SendBreak ( ) ;
@ -228,7 +94,6 @@ void XPROGTarget_DisableTargetPDI(void)
/* Switch to Rx mode to ensure that all pending transmissions are complete */
XPROGTarget_SetRxMode ( ) ;
# if defined(XPROG_VIA_HARDWARE_USART)
/* Turn off receiver and transmitter of the USART, clear settings */
UCSR1A = ( ( 1 < < TXC1 ) | ( 1 < < RXC1 ) ) ;
UCSR1B = 0 ;
@ -237,18 +102,6 @@ void XPROGTarget_DisableTargetPDI(void)
/* Tristate all pins */
DDRD & = ~ ( ( 1 < < 5 ) | ( 1 < < 3 ) ) ;
PORTD & = ~ ( ( 1 < < 5 ) | ( 1 < < 3 ) | ( 1 < < 2 ) ) ;
# else
/* Turn off software USART management timer */
TCCR1B = 0 ;
/* Set DATA and CLOCK lines to inputs */
BITBANG_PDIDATA_DDR & = ~ BITBANG_PDIDATA_MASK ;
BITBANG_PDICLOCK_DDR & = ~ BITBANG_PDICLOCK_MASK ;
/* Tristate DATA and CLOCK lines */
BITBANG_PDIDATA_PORT & = ~ BITBANG_PDIDATA_MASK ;
BITBANG_PDICLOCK_PORT & = ~ BITBANG_PDICLOCK_MASK ;
# endif
}
/** Disables the target's TPI interface, exits programming mode and starts the target's application. */
@ -257,7 +110,6 @@ void XPROGTarget_DisableTargetTPI(void)
/* Switch to Rx mode to ensure that all pending transmissions are complete */
XPROGTarget_SetRxMode ( ) ;
# if defined(XPROG_VIA_HARDWARE_USART)
/* Turn off receiver and transmitter of the USART, clear settings */
UCSR1A | = ( 1 < < TXC1 ) | ( 1 < < RXC1 ) ;
UCSR1B = 0 ;
@ -266,18 +118,6 @@ void XPROGTarget_DisableTargetTPI(void)
/* Set all USART lines as input, tristate */
DDRD & = ~ ( ( 1 < < 5 ) | ( 1 < < 3 ) ) ;
PORTD & = ~ ( ( 1 < < 5 ) | ( 1 < < 3 ) | ( 1 < < 2 ) ) ;
# else
/* Turn off software USART management timer */
TCCR1B = 0 ;
/* Set DATA and CLOCK lines to inputs */
BITBANG_TPIDATA_DDR & = ~ BITBANG_TPIDATA_MASK ;
BITBANG_TPICLOCK_DDR & = ~ BITBANG_TPICLOCK_MASK ;
/* Tristate DATA and CLOCK lines */
BITBANG_TPIDATA_PORT & = ~ BITBANG_TPIDATA_MASK ;
BITBANG_TPICLOCK_PORT & = ~ BITBANG_TPICLOCK_MASK ;
# endif
/* Tristate target /RESET line */
AUX_LINE_DDR & = ~ AUX_LINE_MASK ;
@ -294,30 +134,10 @@ void XPROGTarget_SendByte(const uint8_t Byte)
if ( ! ( IsSending ) )
XPROGTarget_SetTxMode ( ) ;
# if defined(XPROG_VIA_HARDWARE_USART)
/* Wait until there is space in the hardware Tx buffer before writing */
while ( ! ( UCSR1A & ( 1 < < UDRE1 ) ) ) ;
UCSR1A | = ( 1 < < TXC1 ) ;
UDR1 = Byte ;
# else
/* Calculate the new USART frame data here while while we wait for a previous byte (if any) to finish sending */
uint16_t NewUSARTData = ( ( 1 < < 11 ) | ( 1 < < 10 ) | ( 0 < < 9 ) | ( ( uint16_t ) Byte < < 1 ) | ( 0 < < 0 ) ) ;
/* Compute Even parity - while a bit is still set, chop off lowest bit and toggle parity bit */
uint8_t ParityData = Byte ;
while ( ParityData )
{
NewUSARTData ^ = ( 1 < < 9 ) ;
ParityData & = ( ParityData - 1 ) ;
}
/* Wait until transmitter is idle before writing new data */
while ( SoftUSART_BitCount ) ;
/* Data shifted out LSB first, START DATA PARITY STOP STOP */
SoftUSART_Data = NewUSARTData ;
SoftUSART_BitCount = BITS_IN_USART_FRAME ;
# endif
if ( TimeoutMSRemaining )
TimeoutMSRemaining = COMMAND_TIMEOUT_MS ;
@ -333,7 +153,6 @@ uint8_t XPROGTarget_ReceiveByte(void)
if ( IsSending )
XPROGTarget_SetRxMode ( ) ;
# if defined(XPROG_VIA_HARDWARE_USART)
/* Wait until a byte has been received before reading */
while ( ! ( UCSR1A & ( 1 < < RXC1 ) ) & & TimeoutMSRemaining ) ;
@ -341,17 +160,6 @@ uint8_t XPROGTarget_ReceiveByte(void)
TimeoutMSRemaining = COMMAND_TIMEOUT_MS ;
return UDR1 ;
# else
/* Wait until a byte has been received before reading */
SoftUSART_BitCount = BITS_IN_USART_FRAME ;
while ( SoftUSART_BitCount & & TimeoutMSRemaining ) ;
if ( TimeoutMSRemaining )
TimeoutMSRemaining = COMMAND_TIMEOUT_MS ;
/* Throw away the parity and stop bits to leave only the data (start bit is already discarded) */
return ( uint8_t ) SoftUSART_Data ;
# endif
}
/** Sends a BREAK via the USART to the attached target, consisting of a full frame of idle bits. */
@ -361,7 +169,6 @@ void XPROGTarget_SendBreak(void)
if ( ! ( IsSending ) )
XPROGTarget_SetTxMode ( ) ;
# if defined(XPROG_VIA_HARDWARE_USART)
/* Need to do nothing for a full frame to send a BREAK */
for ( uint8_t i = 0 ; i < BITS_IN_USART_FRAME ; i + + )
{
@ -369,13 +176,6 @@ void XPROGTarget_SendBreak(void)
while ( PIND & ( 1 < < 5 ) ) ;
while ( ! ( PIND & ( 1 < < 5 ) ) ) ;
}
# else
while ( SoftUSART_BitCount ) ;
/* Need to do nothing for a full frame to send a BREAK */
SoftUSART_Data = 0x0FFF ;
SoftUSART_BitCount = BITS_IN_USART_FRAME ;
# endif
if ( TimeoutMSRemaining )
TimeoutMSRemaining = COMMAND_TIMEOUT_MS ;
@ -383,7 +183,6 @@ void XPROGTarget_SendBreak(void)
static void XPROGTarget_SetTxMode ( void )
{
# if defined(XPROG_VIA_HARDWARE_USART)
/* Wait for a full cycle of the clock */
while ( PIND & ( 1 < < 5 ) ) ;
while ( ! ( PIND & ( 1 < < 5 ) ) ) ;
@ -395,25 +194,6 @@ static void XPROGTarget_SetTxMode(void)
UCSR1B | = ( 1 < < TXEN1 ) ;
IsSending = true ;
# else
while ( SoftUSART_BitCount & & TimeoutMSRemaining ) ;
/* Wait for a full cycle of the clock */
SoftUSART_Data = 0x0001 ;
SoftUSART_BitCount = 1 ;
while ( SoftUSART_BitCount ) ;
if ( XPROG_SelectedProtocol = = XPRG_PROTOCOL_PDI )
{
BITBANG_PDIDATA_PORT | = BITBANG_PDIDATA_MASK ;
BITBANG_PDIDATA_DDR | = BITBANG_PDIDATA_MASK ;
}
else
{
BITBANG_TPIDATA_PORT | = BITBANG_TPIDATA_MASK ;
BITBANG_TPIDATA_DDR | = BITBANG_TPIDATA_MASK ;
}
# endif
if ( TimeoutMSRemaining )
TimeoutMSRemaining = COMMAND_TIMEOUT_MS ;
@ -423,7 +203,6 @@ static void XPROGTarget_SetTxMode(void)
static void XPROGTarget_SetRxMode ( void )
{
# if defined(XPROG_VIA_HARDWARE_USART)
while ( ! ( UCSR1A & ( 1 < < TXC1 ) ) ) ;
UCSR1A | = ( 1 < < TXC1 ) ;
@ -432,26 +211,6 @@ static void XPROGTarget_SetRxMode(void)
DDRD & = ~ ( 1 < < 3 ) ;
PORTD & = ~ ( 1 < < 3 ) ;
# else
while ( SoftUSART_BitCount & & TimeoutMSRemaining ) ;
if ( XPROG_SelectedProtocol = = XPRG_PROTOCOL_PDI )
{
BITBANG_PDIDATA_DDR & = ~ BITBANG_PDIDATA_MASK ;
BITBANG_PDIDATA_PORT & = ~ BITBANG_PDIDATA_MASK ;
/* Wait until DATA line has been pulled up to idle by the target */
while ( ! ( BITBANG_PDIDATA_PIN & BITBANG_PDIDATA_MASK ) & & TimeoutMSRemaining ) ;
}
else
{
BITBANG_TPIDATA_DDR & = ~ BITBANG_TPIDATA_MASK ;
BITBANG_TPIDATA_PORT & = ~ BITBANG_TPIDATA_MASK ;
/* Wait until DATA line has been pulled up to idle by the target */
while ( ! ( BITBANG_TPIDATA_PIN & BITBANG_TPIDATA_MASK ) & & TimeoutMSRemaining ) ;
}
# endif
if ( TimeoutMSRemaining )
TimeoutMSRemaining = COMMAND_TIMEOUT_MS ;
Dean Camera
15 years ago