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@ -71,7 +71,7 @@ ISR(TIMER1_COMPA_vect, ISR_BLOCK)
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return;
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/* Shift in the bit one less than the frame size in position, so that the start bit will eventually
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* be discarded leaving the data to be byte-aligned for quick access */
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* be discarded leaving the data to be byte-aligned for quick access (subtract 9 as we are ORing to the MSB) */
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if (BITBANG_PDIDATA_PIN & BITBANG_PDIDATA_MASK)
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((uint8_t*)&SoftUSART_Data)[1] |= (1 << (BITS_IN_USART_FRAME - 9));
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@ -117,7 +117,7 @@ ISR(TIMER1_COMPB_vect, ISR_BLOCK)
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return;
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/* Shift in the bit one less than the frame size in position, so that the start bit will eventually
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* be discarded leaving the data to be byte-aligned for quick access */
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* be discarded leaving the data to be byte-aligned for quick access (subtract 9 as we are ORing to the MSB) */
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if (BITBANG_TPIDATA_PIN & BITBANG_TPIDATA_MASK)
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((uint8_t*)&SoftUSART_Data)[1] |= (1 << (BITS_IN_USART_FRAME - 9));
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@ -154,8 +154,7 @@ void XPROGTarget_EnableTargetPDI(void)
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/* Set DATA line high for at least 90ns to disable /RESET functionality */
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PORTD |= (1 << 3);
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asm volatile ("NOP"::);
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asm volatile ("NOP"::);
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_delay_ms(1);
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/* Set up the synchronous USART for XMEGA communications -
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8 data bits, even parity, 2 stop bits */
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@ -169,8 +168,7 @@ void XPROGTarget_EnableTargetPDI(void)
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/* Set DATA line high for at least 90ns to disable /RESET functionality */
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BITBANG_PDIDATA_PORT |= BITBANG_PDIDATA_MASK;
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asm volatile ("NOP"::);
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asm volatile ("NOP"::);
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_delay_ms(1);
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/* Fire timer compare channel A ISR to manage the software USART */
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OCR1A = BITS_BETWEEN_USART_CLOCKS;
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@ -188,11 +186,10 @@ void XPROGTarget_EnableTargetTPI(void)
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{
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IsSending = false;
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/* Set /RESET line low for at least 90ns to enable TPI functionality */
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/* Set /RESET line low for at least 400ns to enable TPI functionality */
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AUX_LINE_DDR |= AUX_LINE_MASK;
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AUX_LINE_PORT &= ~AUX_LINE_MASK;
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asm volatile ("NOP"::);
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asm volatile ("NOP"::);
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_delay_ms(1);
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#if defined(XPROG_VIA_HARDWARE_USART)
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/* Set Tx and XCK as outputs, Rx as input */
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@ -307,7 +304,7 @@ void XPROGTarget_SendByte(const uint8_t Byte)
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uint16_t NewUSARTData = ((1 << 11) | (1 << 10) | (0 << 9) | ((uint16_t)Byte << 1) | (0 << 0));
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/* Compute Even parity - while a bit is still set, chop off lowest bit and toggle parity bit */
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uint8_t ParityData = Byte;
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uint8_t ParityData = Byte;
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while (ParityData)
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{
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NewUSARTData ^= (1 << 9);
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