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AVRISP programmer project now has a more robust timeout system, allowing for a doubling of the software USART speed for PDI and TPI programming.

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This commit is contained in:
Dean Camera 2010-02-19 05:17:41 +00:00
parent 04d40897cf
commit ce8d0424b1
8 changed files with 122 additions and 66 deletions
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118
Projects/AVRISP-MKII/Lib/XPROG/XPROGTarget.c
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@ -49,50 +49,59 @@ volatile uint16_t SoftUSART_Data;
#define SoftUSART_BitCount GPIOR2
/** ISR to manage the PDI software USART when bit-banged PDI USART mode is selected. */
/** ISR to manage the rising edge of the PDI/TPI software USART when bit-banged 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;
TIFR1 |= (1 << OCF1B);
TIMSK1 = (1 << OCIE1B);
/* 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));
/* 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;
SoftUSART_Data >>= 1;
SoftUSART_BitCount--;
}
/* 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--;
}
/** ISR to manage the falling edge of the PDI/TPI software USART when bit-banged USART mode is selected. */
ISR(TIMER1_COMPB_vect, ISR_BLOCK)
{
/* Toggle CLOCK pin in a single cycle (see AVR datasheet) */
BITBANG_PDICLOCK_PIN |= BITBANG_PDICLOCK_MASK;
TIFR1 |= (1 << OCF1A);
TIMSK1 = (1 << OCIE1A);
/* If not sending or receiving, just exit */
if (!(SoftUSART_BitCount))
return;
/* 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
{
/* If at falling clock edge and we are in receive mode, abort */
if (!IsSending)
return;
BITBANG_PDIDATA_PORT &= ~BITBANG_PDIDATA_MASK;
/* 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--;
}
SoftUSART_Data >>= 1;
SoftUSART_BitCount--;
}
/** ISR to manage the TPI software USART when bit-banged TPI USART mode is selected. */
@ -172,7 +181,9 @@ void XPROGTarget_EnableTargetPDI(void)
/* Fire timer compare channel A ISR to manage the software USART */
OCR1A = BITS_BETWEEN_USART_CLOCKS;
OCR1B = BITS_BETWEEN_USART_CLOCKS;
TCCR1B = (1 << WGM12) | (1 << CS10);
TCCR1C = (1 << FOC1B);
TIMSK1 = (1 << OCIE1A);
#endif
@ -240,6 +251,10 @@ void XPROGTarget_DisableTargetPDI(void)
DDRD &= ~((1 << 5) | (1 << 3));
PORTD &= ~((1 << 5) | (1 << 3) | (1 << 2));
#else
/* Turn off software USART management timer */
TCCR1B = 0;
TCCR1C = 0;
/* Set /RESET high for a one millisecond to ensure target device is restarted */
BITBANG_PDICLOCK_PORT |= BITBANG_PDICLOCK_MASK;
_delay_ms(1);
@ -250,7 +265,7 @@ void XPROGTarget_DisableTargetPDI(void)
/* Tristate DATA and CLOCK lines */
BITBANG_PDIDATA_PORT &= ~BITBANG_PDIDATA_MASK;
BITBANG_PDICLOCK_PORT &= ~BITBANG_PDICLOCK_MASK;
BITBANG_PDICLOCK_PORT &= ~BITBANG_PDICLOCK_MASK;
#endif
}
@ -270,6 +285,9 @@ void XPROGTarget_DisableTargetTPI(void)
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;
@ -332,12 +350,31 @@ uint8_t XPROGTarget_ReceiveByte(void)
#if defined(XPROG_VIA_HARDWARE_USART)
/* Wait until a byte has been received before reading */
while (!(UCSR1A & (1 << RXC1)) && TimeoutMSRemaining);
uint8_t TimeoutMSRemaining = 100;
while (!(UCSR1A & (1 << RXC1)) && TimeoutMSRemaining)
{
/* Manage software timeout */
if (TIFR0 & (1 << OCF0A))
{
TIFR0 |= (1 << OCF0A);
TimeoutMSRemaining--;
}
}
return UDR1;
#else
/* Wait until a byte has been received before reading */
SoftUSART_BitCount = BITS_IN_USART_FRAME;
while (SoftUSART_BitCount && TimeoutMSRemaining);
uint8_t TimeoutMSRemaining = 100;
while (SoftUSART_BitCount && TimeoutMSRemaining)
{
/* Manage software timeout */
if (TIFR0 & (1 << OCF0A))
{
TIFR0 |= (1 << OCF0A);
TimeoutMSRemaining--;
}
}
/* Throw away the parity and stop bits to leave only the data (start bit is already discarded) */
return (uint8_t)SoftUSART_Data;
@ -431,7 +468,16 @@ static void XPROGTarget_SetRxMode(void)
}
/* Wait until DATA line has been pulled up to idle by the target */
while (!(BITBANG_PDIDATA_PIN & BITBANG_PDIDATA_MASK) && TimeoutMSRemaining);
uint8_t TimeoutMSRemaining = 100;
while (!(BITBANG_PDIDATA_PIN & BITBANG_PDIDATA_MASK) && TimeoutMSRemaining)
{
/* Manage software timeout */
if (TIFR0 & (1 << OCF0A))
{
TIFR0 |= (1 << OCF0A);
TimeoutMSRemaining--;
}
}
#endif
IsSending = false;