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139 lines
3.5 KiB
C++
139 lines
3.5 KiB
C++
/*
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* Copyright (c) 2012 by Cristian Maglie <c.maglie@bug.st>
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* DAC library for Arduino Due.
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*
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* This file is free software; you can redistribute it and/or modify
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* it under the terms of either the GNU General Public License version 2
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* or the GNU Lesser General Public License version 2.1, both as
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* published by the Free Software Foundation.
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*/
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#include <DAC.h>
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void DACClass::begin(uint32_t period) {
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// Enable clock for DAC
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pmc_enable_periph_clk(dacId);
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dacc_reset(dac);
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// Set transfer mode to double word
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dacc_set_transfer_mode(dac, 1);
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// Power save:
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// sleep mode - 0 (disabled)
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// fast wakeup - 0 (disabled)
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dacc_set_power_save(dac, 0, 0);
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// DAC refresh/startup timings:
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// refresh - 0x08 (1024*8 dacc clocks)
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// max speed mode - 0 (disabled)
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// startup time - 0x10 (1024 dacc clocks)
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dacc_set_timing(dac, 0x08, 0, DACC_MR_STARTUP_1024);
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// Flexible channel selection with tags
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dacc_enable_flexible_selection(dac);
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// Set up analog current
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dacc_set_analog_control(dac,
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DACC_ACR_IBCTLCH0(0x02) |
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DACC_ACR_IBCTLCH1(0x02) |
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DACC_ACR_IBCTLDACCORE(0x01));
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// Enable output channels
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dacc_enable_channel(dac, 0);
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dacc_enable_channel(dac, 1);
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// Configure Timer Counter to trigger DAC
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// --------------------------------------
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pmc_enable_periph_clk(ID_TC1);
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TC_Configure(TC0, 1,
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TC_CMR_TCCLKS_TIMER_CLOCK2 | // Clock at MCR/8
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TC_CMR_WAVE | // Waveform mode
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TC_CMR_WAVSEL_UP_RC | // Counter running up and reset when equals to RC
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TC_CMR_ACPA_SET | TC_CMR_ACPC_CLEAR);
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const uint32_t TC = period / 8;
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TC_SetRA(TC0, 1, TC / 2);
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TC_SetRC(TC0, 1, TC);
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TC_Start(TC0, 1);
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// Configure clock source for DAC (2 = TC0 Output Chan. 1)
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dacc_set_trigger(dac, 2);
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// Configure pins
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PIO_Configure(g_APinDescription[DAC0].pPort,
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g_APinDescription[DAC0].ulPinType,
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g_APinDescription[DAC0].ulPin,
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g_APinDescription[DAC0].ulPinConfiguration);
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PIO_Configure(g_APinDescription[DAC1].pPort,
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g_APinDescription[DAC1].ulPinType,
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g_APinDescription[DAC1].ulPin,
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g_APinDescription[DAC1].ulPinConfiguration);
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// Enable interrupt controller for DAC
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dacc_disable_interrupt(dac, 0xFFFFFFFF);
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NVIC_DisableIRQ(isrId);
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NVIC_ClearPendingIRQ(isrId);
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NVIC_SetPriority(isrId, 0);
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NVIC_EnableIRQ(isrId);
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}
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void DACClass::end() {
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TC_Stop(TC0, 1);
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NVIC_DisableIRQ(isrId);
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dacc_disable_channel(dac, 0);
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dacc_disable_channel(dac, 1);
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}
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bool DACClass::canQueue() {
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return (dac->DACC_TNCR == 0);
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}
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size_t DACClass::queueBuffer(const uint32_t *buffer, size_t size) {
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// Try the first PDC buffer
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if ((dac->DACC_TCR == 0) && (dac->DACC_TNCR == 0)) {
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dac->DACC_TPR = (uint32_t) buffer;
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dac->DACC_TCR = size;
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dac->DACC_PTCR = DACC_PTCR_TXTEN;
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if (cb)
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dacc_enable_interrupt(dac, DACC_IER_ENDTX);
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return size;
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}
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// Try the second PDC buffer
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if (dac->DACC_TNCR == 0) {
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dac->DACC_TNPR = (uint32_t) buffer;
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dac->DACC_TNCR = size;
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dac->DACC_PTCR = DACC_PTCR_TXTEN;
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if (cb)
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dacc_enable_interrupt(dac, DACC_IER_ENDTX);
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return size;
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}
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// PDC buffers full, try again later...
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return 0;
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}
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void DACClass::setOnTransmitEnd_CB(OnTransmitEnd_CB _cb, void *_data) {
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cb = _cb;
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cbData = _data;
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if (!cb)
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dacc_disable_interrupt(dac, DACC_IDR_ENDTX);
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}
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void DACClass::onService() {
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uint32_t sr = dac->DACC_ISR;
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if (sr & DACC_ISR_ENDTX) {
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// There is a free slot, enqueue data
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dacc_disable_interrupt(dac, DACC_IDR_ENDTX);
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if (cb)
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cb(cbData);
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}
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}
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DACClass DAC(DACC_INTERFACE, DACC_INTERFACE_ID, DACC_ISR_ID);
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void DACC_ISR_HANDLER(void) {
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DAC.onService();
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}
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