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