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Oops - PDI handshake delay was too long, causing the device's /RESET functionality to be re-enabled.

This commit is contained in:
Dean Camera 2010-01-31 12:25:53 +00:00
parent 97f7cd947b
commit 75d27f8ef0
1 changed files with 8 additions and 4 deletions
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12
Projects/AVRISP-MKII/Lib/XPROG/XPROGTarget.c
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@ -152,9 +152,11 @@ void XPROGTarget_EnableTargetPDI(void)
DDRD |= (1 << 5) | (1 << 3); DDRD |= (1 << 5) | (1 << 3);
DDRD &= ~(1 << 2); DDRD &= ~(1 << 2);
/* Set DATA line high for at least 90ns to disable /RESET functionality */ /* Set DATA line high for at least 90ns to disable /RESET functionality (note: too long will enable it again,
* so a fixed number of NOPs are used here */
PORTD |= (1 << 3); PORTD |= (1 << 3);
_delay_ms(1); asm volatile ("NOP"::);
asm volatile ("NOP"::);
/* Set up the synchronous USART for XMEGA communications - /* Set up the synchronous USART for XMEGA communications -
8 data bits, even parity, 2 stop bits */ 8 data bits, even parity, 2 stop bits */
@ -166,9 +168,11 @@ void XPROGTarget_EnableTargetPDI(void)
BITBANG_PDIDATA_DDR |= BITBANG_PDIDATA_MASK; BITBANG_PDIDATA_DDR |= BITBANG_PDIDATA_MASK;
BITBANG_PDICLOCK_DDR |= BITBANG_PDICLOCK_MASK; BITBANG_PDICLOCK_DDR |= BITBANG_PDICLOCK_MASK;
/* Set DATA line high for at least 90ns to disable /RESET functionality */ /* Set DATA line high for at least 90ns to disable /RESET functionality (note: too long will enable it again,
* so a fixed number of NOPs are used here */
BITBANG_PDIDATA_PORT |= BITBANG_PDIDATA_MASK; BITBANG_PDIDATA_PORT |= BITBANG_PDIDATA_MASK;
_delay_ms(1); asm volatile ("NOP"::);
asm volatile ("NOP"::);
/* Fire timer compare channel A ISR to manage the software USART */ /* Fire timer compare channel A ISR to manage the software USART */
OCR1A = BITS_BETWEEN_USART_CLOCKS; OCR1A = BITS_BETWEEN_USART_CLOCKS;