From 331e8dece66e632ef3f91b052674948fd74e62a1 Mon Sep 17 00:00:00 2001 From: Dean Camera Date: Sun, 31 Jan 2010 12:33:04 +0000 Subject: Use _delay_us() function in the XPROGTarget.c file to ensure timing requirements are met, rather than a fixed number of NOPs. --- Projects/AVRISP-MKII/Lib/XPROG/XPROGTarget.c | 14 +++++--------- 1 file changed, 5 insertions(+), 9 deletions(-) (limited to 'Projects/AVRISP-MKII/Lib/XPROG/XPROGTarget.c') diff --git a/Projects/AVRISP-MKII/Lib/XPROG/XPROGTarget.c b/Projects/AVRISP-MKII/Lib/XPROG/XPROGTarget.c index 843bf5a7d..e77d77bd5 100644 --- a/Projects/AVRISP-MKII/Lib/XPROG/XPROGTarget.c +++ b/Projects/AVRISP-MKII/Lib/XPROG/XPROGTarget.c @@ -152,11 +152,9 @@ void XPROGTarget_EnableTargetPDI(void) DDRD |= (1 << 5) | (1 << 3); DDRD &= ~(1 << 2); - /* 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 */ + /* Set DATA line high for at least 90ns to disable /RESET functionality */ PORTD |= (1 << 3); - asm volatile ("NOP"::); - asm volatile ("NOP"::); + _delay_us(1); /* Set up the synchronous USART for XMEGA communications - 8 data bits, even parity, 2 stop bits */ @@ -168,11 +166,9 @@ void XPROGTarget_EnableTargetPDI(void) BITBANG_PDIDATA_DDR |= BITBANG_PDIDATA_MASK; BITBANG_PDICLOCK_DDR |= BITBANG_PDICLOCK_MASK; - /* 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 */ + /* 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_us(1); /* Fire timer compare channel A ISR to manage the software USART */ OCR1A = BITS_BETWEEN_USART_CLOCKS; @@ -193,7 +189,7 @@ void XPROGTarget_EnableTargetTPI(void) /* Set /RESET line low for at least 400ns to enable TPI functionality */ AUX_LINE_DDR |= AUX_LINE_MASK; AUX_LINE_PORT &= ~AUX_LINE_MASK; - _delay_ms(1); + _delay_us(1); #if defined(XPROG_VIA_HARDWARE_USART) /* Set Tx and XCK as outputs, Rx as input */ -- cgit v1.2.3