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-rw-r--r--quantum/audio/driver_chibios_dac_basic.c245
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diff --git a/quantum/audio/driver_chibios_dac_basic.c b/quantum/audio/driver_chibios_dac_basic.c
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--- a/quantum/audio/driver_chibios_dac_basic.c
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-/* Copyright 2016-2020 Jack Humbert
- * Copyright 2020 JohSchneider
- *
- * This program is free software: you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation, either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program. If not, see <http://www.gnu.org/licenses/>.
- */
-
-#include "audio.h"
-#include "ch.h"
-#include "hal.h"
-
-/*
- Audio Driver: DAC
-
- which utilizes both channels of the DAC unit many STM32 are equipped with to output a modulated square-wave, from precomputed samples stored in a buffer, which is passed to the hardware through DMA
-
- this driver can either be used to drive to separate speakers, wired to A4+Gnd and A5+Gnd, which allows two tones to be played simultaneously
- OR
- one speaker wired to A4+A5 with the AUDIO_PIN_ALT_AS_NEGATIVE define set - see docs/feature_audio
-
-*/
-
-#if !defined(AUDIO_PIN)
-# pragma message "Audio feature enabled, but no suitable pin selected as AUDIO_PIN - see docs/feature_audio under 'ARM (DAC basic)' for available options."
-// TODO: make this an 'error' instead; go through a breaking change, and add AUDIO_PIN A5 to all keyboards currently using AUDIO on STM32 based boards? - for now: set the define here
-# define AUDIO_PIN A5
-#endif
-// check configuration for ONE speaker, connected to both DAC pins
-#if defined(AUDIO_PIN_ALT_AS_NEGATIVE) && !defined(AUDIO_PIN_ALT)
-# error "Audio feature: AUDIO_PIN_ALT_AS_NEGATIVE set, but no pin configured as AUDIO_PIN_ALT"
-#endif
-
-#ifndef AUDIO_PIN_ALT
-// no ALT pin defined is valid, but the c-ifs below need some value set
-# define AUDIO_PIN_ALT -1
-#endif
-
-#if !defined(AUDIO_STATE_TIMER)
-# define AUDIO_STATE_TIMER GPTD8
-#endif
-
-// square-wave
-static const dacsample_t dac_buffer_1[AUDIO_DAC_BUFFER_SIZE] = {
- // First half is max, second half is 0
- [0 ... AUDIO_DAC_BUFFER_SIZE / 2 - 1] = AUDIO_DAC_SAMPLE_MAX,
- [AUDIO_DAC_BUFFER_SIZE / 2 ... AUDIO_DAC_BUFFER_SIZE - 1] = 0,
-};
-
-// square-wave
-static const dacsample_t dac_buffer_2[AUDIO_DAC_BUFFER_SIZE] = {
- // opposite of dac_buffer above
- [0 ... AUDIO_DAC_BUFFER_SIZE / 2 - 1] = 0,
- [AUDIO_DAC_BUFFER_SIZE / 2 ... AUDIO_DAC_BUFFER_SIZE - 1] = AUDIO_DAC_SAMPLE_MAX,
-};
-
-GPTConfig gpt6cfg1 = {.frequency = AUDIO_DAC_SAMPLE_RATE,
- .callback = NULL,
- .cr2 = TIM_CR2_MMS_1, /* MMS = 010 = TRGO on Update Event. */
- .dier = 0U};
-GPTConfig gpt7cfg1 = {.frequency = AUDIO_DAC_SAMPLE_RATE,
- .callback = NULL,
- .cr2 = TIM_CR2_MMS_1, /* MMS = 010 = TRGO on Update Event. */
- .dier = 0U};
-
-static void gpt_audio_state_cb(GPTDriver *gptp);
-GPTConfig gptStateUpdateCfg = {.frequency = 10,
- .callback = gpt_audio_state_cb,
- .cr2 = TIM_CR2_MMS_1, /* MMS = 010 = TRGO on Update Event. */
- .dier = 0U};
-
-static const DACConfig dac_conf_ch1 = {.init = AUDIO_DAC_OFF_VALUE, .datamode = DAC_DHRM_12BIT_RIGHT};
-static const DACConfig dac_conf_ch2 = {.init = AUDIO_DAC_OFF_VALUE, .datamode = DAC_DHRM_12BIT_RIGHT};
-
-/**
- * @note The DAC_TRG(0) here selects the Timer 6 TRGO event, which is triggered
- * on the rising edge after 3 APB1 clock cycles, causing our gpt6cfg1.frequency
- * to be a third of what we expect.
- *
- * Here are all the values for DAC_TRG (TSEL in the ref manual)
- * TIM15_TRGO 0b011
- * TIM2_TRGO 0b100
- * TIM3_TRGO 0b001
- * TIM6_TRGO 0b000
- * TIM7_TRGO 0b010
- * EXTI9 0b110
- * SWTRIG 0b111
- */
-static const DACConversionGroup dac_conv_grp_ch1 = {.num_channels = 1U, .trigger = DAC_TRG(0b000)};
-static const DACConversionGroup dac_conv_grp_ch2 = {.num_channels = 1U, .trigger = DAC_TRG(0b010)};
-
-void channel_1_start(void) {
- gptStart(&GPTD6, &gpt6cfg1);
- gptStartContinuous(&GPTD6, 2U);
- palSetPadMode(GPIOA, 4, PAL_MODE_INPUT_ANALOG);
-}
-
-void channel_1_stop(void) {
- gptStopTimer(&GPTD6);
- palSetPadMode(GPIOA, 4, PAL_MODE_OUTPUT_PUSHPULL);
- palSetPad(GPIOA, 4);
-}
-
-static float channel_1_frequency = 0.0f;
-void channel_1_set_frequency(float freq) {
- channel_1_frequency = freq;
-
- channel_1_stop();
- if (freq <= 0.0) // a pause/rest has freq=0
- return;
-
- gpt6cfg1.frequency = 2 * freq * AUDIO_DAC_BUFFER_SIZE;
- channel_1_start();
-}
-float channel_1_get_frequency(void) { return channel_1_frequency; }
-
-void channel_2_start(void) {
- gptStart(&GPTD7, &gpt7cfg1);
- gptStartContinuous(&GPTD7, 2U);
- palSetPadMode(GPIOA, 5, PAL_MODE_INPUT_ANALOG);
-}
-
-void channel_2_stop(void) {
- gptStopTimer(&GPTD7);
- palSetPadMode(GPIOA, 5, PAL_MODE_OUTPUT_PUSHPULL);
- palSetPad(GPIOA, 5);
-}
-
-static float channel_2_frequency = 0.0f;
-void channel_2_set_frequency(float freq) {
- channel_2_frequency = freq;
-
- channel_2_stop();
- if (freq <= 0.0) // a pause/rest has freq=0
- return;
-
- gpt7cfg1.frequency = 2 * freq * AUDIO_DAC_BUFFER_SIZE;
- channel_2_start();
-}
-float channel_2_get_frequency(void) { return channel_2_frequency; }
-
-static void gpt_audio_state_cb(GPTDriver *gptp) {
- if (audio_update_state()) {
-#if defined(AUDIO_PIN_ALT_AS_NEGATIVE)
- // one piezo/speaker connected to both audio pins, the generated square-waves are inverted
- channel_1_set_frequency(audio_get_processed_frequency(0));
- channel_2_set_frequency(audio_get_processed_frequency(0));
-
-#else // two separate audio outputs/speakers
- // primary speaker on A4, optional secondary on A5
- if (AUDIO_PIN == A4) {
- channel_1_set_frequency(audio_get_processed_frequency(0));
- if (AUDIO_PIN_ALT == A5) {
- if (audio_get_number_of_active_tones() > 1) {
- channel_2_set_frequency(audio_get_processed_frequency(1));
- } else {
- channel_2_stop();
- }
- }
- }
-
- // primary speaker on A5, optional secondary on A4
- if (AUDIO_PIN == A5) {
- channel_2_set_frequency(audio_get_processed_frequency(0));
- if (AUDIO_PIN_ALT == A4) {
- if (audio_get_number_of_active_tones() > 1) {
- channel_1_set_frequency(audio_get_processed_frequency(1));
- } else {
- channel_1_stop();
- }
- }
- }
-#endif
- }
-}
-
-void audio_driver_initialize() {
- if ((AUDIO_PIN == A4) || (AUDIO_PIN_ALT == A4)) {
- palSetPadMode(GPIOA, 4, PAL_MODE_INPUT_ANALOG);
- dacStart(&DACD1, &dac_conf_ch1);
-
- // initial setup of the dac-triggering timer is still required, even
- // though it gets reconfigured and restarted later on
- gptStart(&GPTD6, &gpt6cfg1);
- }
-
- if ((AUDIO_PIN == A5) || (AUDIO_PIN_ALT == A5)) {
- palSetPadMode(GPIOA, 5, PAL_MODE_INPUT_ANALOG);
- dacStart(&DACD2, &dac_conf_ch2);
-
- gptStart(&GPTD7, &gpt7cfg1);
- }
-
- /* enable the output buffer, to directly drive external loads with no additional circuitry
- *
- * see: AN4566 Application note: Extending the DAC performance of STM32 microcontrollers
- * Note: Buffer-Off bit -> has to be set 0 to enable the output buffer
- * Note: enabling the output buffer imparts an additional dc-offset of a couple mV
- *
- * this is done here, reaching directly into the stm32 registers since chibios has not implemented BOFF handling yet
- * (see: chibios/os/hal/ports/STM32/todo.txt '- BOFF handling in DACv1.'
- */
- DACD1.params->dac->CR &= ~DAC_CR_BOFF1;
- DACD2.params->dac->CR &= ~DAC_CR_BOFF2;
-
- // start state-updater
- gptStart(&AUDIO_STATE_TIMER, &gptStateUpdateCfg);
-}
-
-void audio_driver_stop(void) {
- if ((AUDIO_PIN == A4) || (AUDIO_PIN_ALT == A4)) {
- gptStopTimer(&GPTD6);
-
- // stop the ongoing conversion and put the output in a known state
- dacStopConversion(&DACD1);
- dacPutChannelX(&DACD1, 0, AUDIO_DAC_OFF_VALUE);
- }
-
- if ((AUDIO_PIN == A5) || (AUDIO_PIN_ALT == A5)) {
- gptStopTimer(&GPTD7);
-
- dacStopConversion(&DACD2);
- dacPutChannelX(&DACD2, 0, AUDIO_DAC_OFF_VALUE);
- }
- gptStopTimer(&AUDIO_STATE_TIMER);
-}
-
-void audio_driver_start(void) {
- if ((AUDIO_PIN == A4) || (AUDIO_PIN_ALT == A4)) {
- dacStartConversion(&DACD1, &dac_conv_grp_ch1, (dacsample_t *)dac_buffer_1, AUDIO_DAC_BUFFER_SIZE);
- }
- if ((AUDIO_PIN == A5) || (AUDIO_PIN_ALT == A5)) {
- dacStartConversion(&DACD2, &dac_conv_grp_ch2, (dacsample_t *)dac_buffer_2, AUDIO_DAC_BUFFER_SIZE);
- }
- gptStartContinuous(&AUDIO_STATE_TIMER, 2U);
-}