118 lines
2.6 KiB
C
118 lines
2.6 KiB
C
/*
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* This file is subject to the terms of the GFX License. If a copy of
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* the license was not distributed with this file, you can obtain one at:
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*
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* http://ugfx.org/license.html
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*/
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#include "gfx.h"
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#if GFX_USE_GAUDIO && GAUDIO_NEED_PLAY
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/* Include the driver defines */
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#include "src/gaudio/gaudio_driver_play.h"
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/* Forward definition */
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static void gaudio_play_pwm_timer_callbackI(void);
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/* Include the board interface */
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#include "gaudio_play_board.h"
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static GDataBuffer *pplay;
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static ArrayDataFormat playfmt;
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static size_t playlen;
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static uint8_t *pdata;
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static void gaudio_play_pwm_timer_callbackI(void) {
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if (pplay) {
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// Get the next value from the current data buffer
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if (gfxSampleFormatBits(playfmt) > 8) {
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gaudio_play_pwm_setI(*(uint16_t *)pdata);
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pdata += 2;
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} else {
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gaudio_play_pwm_setI(*pdata);
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pdata++;
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}
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// Are we done yet
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if (--playlen)
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return;
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gaudioPlayReleaseDataBlockI(pplay);
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// Get a new data buffer
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if (!(pplay = gaudioPlayGetDataBlockI())) {
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// All is done
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gaudioPlayDoneI();
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return;
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}
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} else {
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// Get a new data buffer
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if (!(pplay = gaudioPlayGetDataBlockI()))
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return;
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}
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// Set up ready for the new buffer
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playlen = pplay->len;
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if (gfxSampleFormatBits(playfmt) > 8)
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playlen >>= 1;
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pdata = (uint8_t *)(pplay+1);
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}
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/*===========================================================================*/
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/* External declarations. */
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/*===========================================================================*/
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bool_t gaudio_play_lld_init(uint16_t channel, uint32_t frequency, ArrayDataFormat format) {
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(void) channel;
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if (format != ARRAY_DATA_8BITUNSIGNED && format != ARRAY_DATA_10BITUNSIGNED)
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return FALSE;
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playfmt = format;
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return gaudio_play_pwm_setup(frequency, format);
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}
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bool_t gaudio_play_lld_set_volume(uint8_t vol) {
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(void) vol;
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return FALSE;
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}
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void gaudio_play_lld_start(void) {
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gfxSystemLock();
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// Get a new data buffer
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if (pplay || !(pplay = gaudioPlayGetDataBlockI())) {
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gfxSystemUnlock(); // Nothing to do
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return;
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}
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// Set up ready for the new buffer
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playlen = pplay->len;
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if (gfxSampleFormatBits(playfmt) > 8)
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playlen >>= 1;
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pdata = (uint8_t *)(pplay+1);
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gfxSystemUnlock();
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// Start the playing
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gaudio_play_pwm_start();
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}
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void gaudio_play_lld_stop(void) {
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// Stop everything
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gaudio_play_pwm_stop();
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// We may need to clean up the remaining buffer.
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gfxSystemLock();
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if (pplay) {
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gaudioPlayReleaseDataBlockI(pplay);
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pplay = 0;
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gaudioPlayDoneI();
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}
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gfxSystemUnlock();
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}
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#endif /* GFX_USE_GAUDIO && GAUDIO_NEED_PLAY */
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