76 lines
1.9 KiB
C
76 lines
1.9 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.io/license.html
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*/
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#ifndef GAUDIO_PLAY_BOARD_H
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#define GAUDIO_PLAY_BOARD_H
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/* Our timer callback */
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static void gptcallback(GPTDriver *gptp) {
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(void) gptp;
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gaudio_play_pwm_timer_callbackI();
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}
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/* PWM configuration structure. The speaker is on PWM0/PB19 ie PWM1/PIN1 in ChibiOS speak */
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static PWMConfig pwmcfg = {
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1000000, /* 1 MHz PWM clock frequency. Ignored as we are using PWM_MCK_DIV_n */
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1024, /* PWM period is 1024 cycles (10 bits). */
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0,
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{
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{PWM_MCK_DIV_1 | PWM_OUTPUT_CENTER | PWM_OUTPUT_ACTIVE_HIGH | PWM_OUTPUT_PIN1 | PWM_DISABLEPULLUP_PIN1, 0},
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},
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};
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/* Timer configuration structure. We use Timer 2 (TC1) */
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static GPTConfig gptcfg = {
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8192, // frequency
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gptcallback, // callback
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GPT_CLOCK_FREQUENCY, // clocksource
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GPT_GATE_NONE, // clockgate
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GPT_TRIGGER_NONE, // trigger
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};
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static gU16 lastvalue;
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static gBool gaudio_play_pwm_setup(gU32 frequency, ArrayDataFormat format) {
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if (format == ARRAY_DATA_10BITUNSIGNED)
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pwmcfg.period = 1024;
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else if (format == ARRAY_DATA_8BITUNSIGNED)
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pwmcfg.period = 256;
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else
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return gFalse;
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gptcfg.frequency = frequency;
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return gTrue;
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}
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static void gaudio_play_pwm_start(void) {
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/* Start the PWM */
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pwmStart(&PWMD1, &pwmcfg);
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lastvalue = pwmcfg.period>>1;
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pwmEnableChannelI(&PWMD1, 0, lastvalue);
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/* Start the timer interrupt */
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gptStart(&GPTD2, &gptcfg);
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gptStartContinuous(&GPTD2, 0);
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}
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static void gaudio_play_pwm_stop(void) {
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/* Stop the timer interrupt */
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gptStopTimer(&GPTD2);
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/* Stop the PWM */
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pwmStop(&PWMD1);
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}
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static void gaudio_play_pwm_setI(gU16 value) {
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if (value != lastvalue) {
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lastvalue = value;
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pwmEnableChannelI(&PWMD1, 0, value);
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}
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}
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#endif /* GAUDIO_PLAY_BOARD_H */
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