inline void Timer23_Setup(void)
{
OpenTimer23(
T2_OFF &
T2_IDLE_CON &
T2_GATE_OFF &
T2_PS_1_256 &
T2_32BIT_MODE_ON &
T2_SOURCE_INT,
PR23);
ConfigIntTimer23(
T3_INT_PRIOR_2 &
T3_INT_ON
);
return;
}
int main(void)
{
int dmaChn=0; // the DMA channel to use
// first let us set the LED I/O ports as digital outputs
mPORTASetPinsDigitalOut(0xff);
mPORTAClearBits(0xff); // start with all LED's turned off
// Open the desired DMA channel.
// We enable the AUTO option, we'll keep repeating the sam transfer over and over.
DmaChnOpen(dmaChn, 0, DMA_OPEN_AUTO);
// set the transfer parameters: source & destination address, source & destination size, number of bytes per event
DmaChnSetTxfer(dmaChn, LED_pattern, (void*)&LATA, sizeof(LED_pattern), 1, 1);
// set the transfer event control: what event is to start the DMA transfer
DmaChnSetEventControl(dmaChn, DMA_EV_START_IRQ(_TIMER_3_IRQ));
// once we configured the DMA channel we can enable it
// now it's ready and waiting for an event to occur...
DmaChnEnable(dmaChn);
// now use the 32 bit timer to generate an interrupt at the desired LED_BLINK_RATE
{
int pbFreq=SYS_FREQ/(1<<mOSCGetPBDIV()); // get the PB frequency the timer is running at
// use 1:1 prescaler for max resolution, the PB clock
OpenTimer23(T2_ON | T2_SOURCE_INT | T2_PS_1_1, (pbFreq/1000)*LED_BLINK_RATE);
}
while(1)
{
// do some other useful work
}
}
