/*
* Setup the timer 0 to generate the tick interrupts at the required frequency.
*/
static void prvSetupTimerInterrupt( void )
{
unsigned long ulCompareMatch;
/* Calculate the match value required for our wanted tick rate. */
ulCompareMatch = 1000000 / configTICK_RATE_HZ;
/* Protect against divide by zero. Using an if() statement still results
in a warning - hence the #if. */
#if portPRESCALE_VALUE != 0
{
ulCompareMatch /= ( portPRESCALE_VALUE + 1 );
}
#endif
irqBlock();
pRegs->CTL = 0x003E0000;
pRegs->LOD = 1000 - 1;
pRegs->RLD = 1000 - 1;
pRegs->DIV = portTIMER_PRESCALE;
pRegs->CLI = 0;
pRegs->CTL = 0x003E00A2;
irqRegister(64, vTickISR, NULL);
irqEnable(64);
irqUnblock();
}
// Initialize touch input
void touchInit(uint32_t channelMask)
{
int i;
// Turn on clock gating for TSI and configure touch input
clkEnable(CLK_TSI);
TSI0_GENCS |= ( TSI_GENCS_ESOR_MASK // Enable end of scan interrupt
| TSI_GENCS_MODE(0) // Capacitive sensing
| TSI_GENCS_REFCHRG(4) // Reference charge 4 uA
| TSI_GENCS_DVOLT(0) // Voltage rails
| TSI_GENCS_EXTCHRG(7) // External osc charge
| TSI_GENCS_PS(4) // Pre-scalar divide by 4
| TSI_GENCS_NSCN(11) // Scans per electrode
| TSI_GENCS_TSIIEN_MASK // Input interrupt enable
| TSI_GENCS_STPE_MASK // Enable in STOP mode
);
TSI0_GENCS |= TSI_GENCS_TSIEN_MASK;
// Read initial (baseline) values for each enabled channel
sEnableMask = channelMask;
for (i = (NUM_CHANNELS - 1); i >= 0; i--)
{
if ((1 << i) & sEnableMask)
{
scanStart(i);
while (!(TSI0_GENCS & TSI_GENCS_EOSF_MASK)) // Wait until done
;
sBaseCounts[i] = scanData();
}
}
// Enable TSI interrupts and start the scan timer
irqRegister(INT_TSI0, tsiIrqHandler, 0);
irqEnable(INT_TSI0);
{
osTimerDef_t tDef;
tDef.ptimer = startTimerCb;
tDef.millisec = TOUCH_SCAN_TIME;
tDef.name = "touch";
sStartTimer = osTimerCreate(&tDef, osTimerPeriodic, 0);
osTimerStart(sStartTimer, TOUCH_SCAN_TIME);
}
}