Make a new general RingBuffer.h misc library driver, instead of the per-application...

[pub/USBasp.git] / Projects / AVRISP-MKII / Lib / ISP / ISPTarget.c

diff --git a/Projects/AVRISP-MKII/Lib/ISP/ISPTarget.c b/Projects/AVRISP-MKII/Lib/ISP/ISPTarget.c
index 657c2c9..811e777 100644 (file)
--- a/Projects/AVRISP-MKII/Lib/ISP/ISPTarget.c
+++ b/Projects/AVRISP-MKII/Lib/ISP/ISPTarget.c
@@ -117,6 +117,7 @@ volatile uint8_t SoftSPI_BitsRemaining;
 /** ISR to handle software SPI transmission and reception */
 ISR(TIMER1_COMPA_vect, ISR_BLOCK)
 {
+       /* Check if rising edge (output next bit) or falling edge (read in next bit) */
        if (!(PINB & (1 << 1)))
        {
                if (SoftSPI_Data & (1 << 7))
@@ -178,6 +179,8 @@ void ISPTarget_DisableTargetISP(void)
                DDRB  &= ~((1 << 1) | (1 << 2));
                PORTB &= ~((1 << 0) | (1 << 3));
                
+               /* Must re-enable rescue clock once software ISP has exited, as the timer for the rescue clock is
+                * re-purposed for software SPI */
                ISPTarget_ConfigureRescueClock();
        }
 }