diff options
Diffstat (limited to 'quantum/audio/driver_chibios_dac_basic.c')
| -rw-r--r-- | quantum/audio/driver_chibios_dac_basic.c | 245 | 
1 files changed, 0 insertions, 245 deletions
| diff --git a/quantum/audio/driver_chibios_dac_basic.c b/quantum/audio/driver_chibios_dac_basic.c deleted file mode 100644 index fac6513506..0000000000 --- a/quantum/audio/driver_chibios_dac_basic.c +++ /dev/null @@ -1,245 +0,0 @@ -/* 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); -} | 
