Use _delay_us() function in the XPROGTarget.c file to ensure timing requirements...

diff --git a/Projects/AVRISP-MKII/Lib/XPROG/XPROGTarget.c b/Projects/AVRISP-MKII/Lib/XPROG/XPROGTarget.c
index 843bf5a..e77d77b 100644 (file)
--- 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);\r
        DDRD &= ~(1 << 2);\r
        \r
        DDRD |=  (1 << 5) | (1 << 3);\r
        DDRD &= ~(1 << 2);\r
        \r

-       /* Set DATA line high for at least 90ns to disable /RESET functionality (note: too long will enable it again,\r
-        * so a fixed number of NOPs are used here */\r
+       /* Set DATA line high for at least 90ns to disable /RESET functionality */\r

        PORTD |= (1 << 3);\r
        PORTD |= (1 << 3);\r

-       asm volatile ("NOP"::);\r
-       asm volatile ("NOP"::);\r
+       _delay_us(1);\r

        \r
        /* Set up the synchronous USART for XMEGA communications - \r
           8 data bits, even parity, 2 stop bits */\r
        \r
        /* Set up the synchronous USART for XMEGA communications - \r
           8 data bits, even parity, 2 stop bits */\r


@@ -168,11 +166,9 @@ void XPROGTarget_EnableTargetPDI(void)
        BITBANG_PDIDATA_DDR  |= BITBANG_PDIDATA_MASK;\r
        BITBANG_PDICLOCK_DDR |= BITBANG_PDICLOCK_MASK;\r
        \r
        BITBANG_PDIDATA_DDR  |= BITBANG_PDIDATA_MASK;\r
        BITBANG_PDICLOCK_DDR |= BITBANG_PDICLOCK_MASK;\r
        \r

-       /* Set DATA line high for at least 90ns to disable /RESET functionality (note: too long will enable it again,\r
-        * so a fixed number of NOPs are used here */\r
+       /* Set DATA line high for at least 90ns to disable /RESET functionality */\r

        BITBANG_PDIDATA_PORT |= BITBANG_PDIDATA_MASK;\r
        BITBANG_PDIDATA_PORT |= BITBANG_PDIDATA_MASK;\r

-       asm volatile ("NOP"::);\r
-       asm volatile ("NOP"::);\r
+       _delay_us(1);\r

 \r
        /* Fire timer compare channel A ISR to manage the software USART */\r
        OCR1A   = BITS_BETWEEN_USART_CLOCKS;\r
 \r
        /* Fire timer compare channel A ISR to manage the software USART */\r
        OCR1A   = BITS_BETWEEN_USART_CLOCKS;\r


@@ -193,7 +189,7 @@ void XPROGTarget_EnableTargetTPI(void)
        /* Set /RESET line low for at least 400ns to enable TPI functionality */\r
        AUX_LINE_DDR  |=  AUX_LINE_MASK;\r
        AUX_LINE_PORT &= ~AUX_LINE_MASK;\r
        /* Set /RESET line low for at least 400ns to enable TPI functionality */\r
        AUX_LINE_DDR  |=  AUX_LINE_MASK;\r
        AUX_LINE_PORT &= ~AUX_LINE_MASK;\r

-       _delay_ms(1);\r
+       _delay_us(1);\r

 \r
 #if defined(XPROG_VIA_HARDWARE_USART)\r
        /* Set Tx and XCK as outputs, Rx as input */\r
 \r
 #if defined(XPROG_VIA_HARDWARE_USART)\r
        /* Set Tx and XCK as outputs, Rx as input */\r