Arduino Due Timers Help

hello, own arduino uno , i'm considering arduino due. i'm going use many timers drive dot-matrix printer head in order make music, mididesaster has made, simpler hardware. problem is: in datasheet of sam3x8e, 6 channels of timer counters mapped physical pins of processor. read in other topic due's timers using code, address unmapped timers, i'm not sure.

quote from: sebastian vik on nov 05, 2012, 09:48 pm

using code, can set timer of isrs tc0_handler through tc8_handler, see table of parameters below. possible use timers without physically mapped pin, such tc1 channel 0 (tc3_handler) shown here:

code: [select]


volatile boolean l;

//tc1 ch 0
void tc3_handler()
{
        tc_getstatus(tc1, 0);
        digitalwrite(13, l = !l);
}

void starttimer(tc *tc, uint32_t channel, irqn_type irq, uint32_t frequency) {
        pmc_set_writeprotect(false);
        pmc_enable_periph_clk((uint32_t)irq);
        tc_configure(tc, channel, tc_cmr_wave | tc_cmr_wavsel_up_rc | tc_cmr_tcclks_timer_clock4);
        uint32_t rc = variant_mck/128/frequency; //128 because selected timer_clock4 above
        tc_setra(tc, channel, rc/2); //50% high, 50% low
        tc_setrc(tc, channel, rc);
        tc_start(tc, channel);
        tc->tc_channel[channel].tc_ier=tc_ier_cpcs;
        tc->tc_channel[channel].tc_idr=~tc_ier_cpcs;
        nvic_enableirq(irq);
}

void setup(){
        pinmode(13,output);
        starttimer(tc1, 0, tc3_irqn, 4); //tc1 channel 0, irq channel , desired frequency
}

void loop(){
}


here table of parameters:

isr/irq	tc	channel	due pins
tc0	tc0	0	2, 13
tc1	tc0	1	60, 61
tc2	tc0	2	58
tc3	tc1	0	none  <- line in example above
tc4	tc1	1	none
tc5	tc1	2	none
tc6	tc2	0	4, 5
tc7	tc2	1	3, 10
tc8	tc2	2	11, 12

i need generate independent frequencies (5hz - 2khz) , duty cycles @ least 8 channels sam3x8e in order drive printer's pins , need sure if processor able this.

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