76 lines
1.9 KiB
C
76 lines
1.9 KiB
C
/*
|
|
* This file is subject to the terms of the GFX License. If a copy of
|
|
* the license was not distributed with this file, you can obtain one at:
|
|
*
|
|
* http://ugfx.org/license.html
|
|
*/
|
|
|
|
#ifndef GAUDIO_PLAY_BOARD_H
|
|
#define GAUDIO_PLAY_BOARD_H
|
|
|
|
/* Our timer callback */
|
|
static void gptcallback(GPTDriver *gptp) {
|
|
(void) gptp;
|
|
gaudio_play_pwm_timer_callbackI();
|
|
}
|
|
|
|
/* PWM configuration structure. The speaker is on PWM0/PB19 ie PWM1/PIN1 in ChibiOS speak */
|
|
static PWMConfig pwmcfg = {
|
|
1000000, /* 1 MHz PWM clock frequency. Ignored as we are using PWM_MCK_DIV_n */
|
|
1024, /* PWM period is 1024 cycles (10 bits). */
|
|
0,
|
|
{
|
|
{PWM_MCK_DIV_1 | PWM_OUTPUT_CENTER | PWM_OUTPUT_ACTIVE_HIGH | PWM_OUTPUT_PIN1 | PWM_DISABLEPULLUP_PIN1, 0},
|
|
},
|
|
};
|
|
|
|
/* Timer configuration structure. We use Timer 2 (TC1) */
|
|
static GPTConfig gptcfg = {
|
|
8192, // frequency
|
|
gptcallback, // callback
|
|
GPT_CLOCK_FREQUENCY, // clocksource
|
|
GPT_GATE_NONE, // clockgate
|
|
GPT_TRIGGER_NONE, // trigger
|
|
};
|
|
|
|
static uint16_t lastvalue;
|
|
|
|
static gBool gaudio_play_pwm_setup(uint32_t frequency, ArrayDataFormat format) {
|
|
if (format == ARRAY_DATA_10BITUNSIGNED)
|
|
pwmcfg.period = 1024;
|
|
else if (format == ARRAY_DATA_8BITUNSIGNED)
|
|
pwmcfg.period = 256;
|
|
else
|
|
return gFalse;
|
|
gptcfg.frequency = frequency;
|
|
return gTrue;
|
|
}
|
|
|
|
static void gaudio_play_pwm_start(void) {
|
|
/* Start the PWM */
|
|
pwmStart(&PWMD1, &pwmcfg);
|
|
lastvalue = pwmcfg.period>>1;
|
|
pwmEnableChannelI(&PWMD1, 0, lastvalue);
|
|
|
|
/* Start the timer interrupt */
|
|
gptStart(&GPTD2, &gptcfg);
|
|
gptStartContinuous(&GPTD2, 0);
|
|
}
|
|
|
|
static void gaudio_play_pwm_stop(void) {
|
|
/* Stop the timer interrupt */
|
|
gptStopTimer(&GPTD2);
|
|
|
|
/* Stop the PWM */
|
|
pwmStop(&PWMD1);
|
|
}
|
|
|
|
static void gaudio_play_pwm_setI(uint16_t value) {
|
|
if (value != lastvalue) {
|
|
lastvalue = value;
|
|
pwmEnableChannelI(&PWMD1, 0, value);
|
|
}
|
|
}
|
|
|
|
#endif /* GAUDIO_PLAY_BOARD_H */
|