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Ensure TPI enable timing requirements are met in AVRISP-MKII programmer. Remove invalid code in the TPI read/write functions.

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This commit is contained in:
Dean Camera 2010-01-27 03:45:15 +00:00
parent 2059fd8b1a
commit 1aeb5056d6
3 changed files with 13 additions and 21 deletions
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17
Projects/AVRISP-MKII/Lib/XPROG/XPROGTarget.c
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@ -71,7 +71,7 @@ ISR(TIMER1_COMPA_vect, ISR_BLOCK)
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 */
* 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));
@ -117,7 +117,7 @@ ISR(TIMER1_COMPB_vect, ISR_BLOCK)
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 */
* 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));
@ -154,8 +154,7 @@ void XPROGTarget_EnableTargetPDI(void)
/* Set DATA line high for at least 90ns to disable /RESET functionality */
PORTD |= (1 << 3);
asm volatile ("NOP"::);
asm volatile ("NOP"::);
_delay_ms(1);
/* Set up the synchronous USART for XMEGA communications -
8 data bits, even parity, 2 stop bits */
@ -169,8 +168,7 @@ void XPROGTarget_EnableTargetPDI(void)
/* Set DATA line high for at least 90ns to disable /RESET functionality */
BITBANG_PDIDATA_PORT |= BITBANG_PDIDATA_MASK;
asm volatile ("NOP"::);
asm volatile ("NOP"::);
_delay_ms(1);
/* Fire timer compare channel A ISR to manage the software USART */
OCR1A = BITS_BETWEEN_USART_CLOCKS;
@ -188,11 +186,10 @@ void XPROGTarget_EnableTargetTPI(void)
{
IsSending = false;
/* Set /RESET line low for at least 90ns to enable TPI functionality */
/* Set /RESET line low for at least 400ns to enable TPI functionality */
AUX_LINE_DDR |= AUX_LINE_MASK;
AUX_LINE_PORT &= ~AUX_LINE_MASK;
asm volatile ("NOP"::);
asm volatile ("NOP"::);
_delay_ms(1);
#if defined(XPROG_VIA_HARDWARE_USART)
/* Set Tx and XCK as outputs, Rx as input */
@ -307,7 +304,7 @@ void XPROGTarget_SendByte(const uint8_t Byte)
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;
uint8_t ParityData = Byte;
while (ParityData)
{
NewUSARTData ^= (1 << 9);