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Changed AVRISP-MKII project to use the Watchdog interrupt for command timeouts, to reduce CPU usage and free timer 0 for other uses in the future.

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This commit is contained in:
Dean Camera 2011-01-22 17:48:06 +00:00
parent ef44b8c036
commit 26017b68b0
10 changed files with 37 additions and 35 deletions
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22
Projects/AVRISP-MKII/Lib/V2Protocol.c
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@ -44,10 +44,10 @@ bool MustLoadExtendedAddress;
/** ISR to manage timeouts whilst processing a V2Protocol command */
ISR(TIMER0_COMPA_vect, ISR_NOBLOCK)
ISR(WDT_vect, ISR_BLOCK)
{
if (TimeoutTicksRemaining)
TimeoutTicksRemaining--;
TimeoutExpired = true;
wdt_disable();
}
/** Initialises the hardware and software associated with the V2 protocol command handling. */
@ -60,11 +60,6 @@ void V2Protocol_Init(void)
ADC_StartReading(ADC_REFERENCE_AVCC | ADC_RIGHT_ADJUSTED | VTARGET_ADC_CHANNEL_MASK);
#endif
/* Timeout timer initialization (10ms period) */
OCR0A = (((F_CPU / 1024) / 100) - 1);
TCCR0A = (1 << WGM01);
TIMSK0 = (1 << OCIE0A);
V2Params_LoadNonVolatileParamValues();
#if defined(ENABLE_ISP_PROTOCOL)
@ -80,9 +75,10 @@ void V2Protocol_ProcessCommand(void)
{
uint8_t V2Command = Endpoint_Read_Byte();
/* Start the timeout management timer */
TimeoutTicksRemaining = COMMAND_TIMEOUT_TICKS;
TCCR0B = ((1 << CS02) | (1 << CS00));
/* Start the watchdog with timeout interrupt enabled to manage the timeout */
TimeoutExpired = false;
wdt_enable(WDTO_1S);
WDTCSR |= (1 << WDIE);
switch (V2Command)
{
@ -144,8 +140,8 @@ void V2Protocol_ProcessCommand(void)
break;
}
/* Disable the timeout management timer */
TCCR0B = 0;
/* Disable the timeout management watchdog timer */
wdt_disable();
Endpoint_WaitUntilReady();
Endpoint_SelectEndpoint(AVRISP_DATA_OUT_EPNUM);