arduino/esp8266
1
0
Fork 0
mirror of https://github.com/esp8266/Arduino.git synced 2025-06-22 08:22:04 +03:00
Code Activity

Audio library to format 1.5 rev.2

Browse Source
This commit is contained in:
Cristian Maglie
2013-12-27 01:30:54 +01:00
parent d930e22436
commit a80b2b1d53
3 changed files with 8 additions and 10 deletions
Download Patch File Download Diff File Expand all files Collapse all files

138
libraries/Audio/src/DAC.cpp Normal file
View File

@ -0,0 +1,138 @@
/*
* 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();
}