mirror of
https://github.com/Spritetm/minimacplus.git
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69 lines
1.5 KiB
C
69 lines
1.5 KiB
C
#include <stdio.h>
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#include <stdint.h>
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#include <unistd.h>
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#include "freertos/FreeRTOS.h"
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#include "freertos/task.h"
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#include "freertos/queue.h"
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#include "freertos/semphr.h"
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#include <driver/i2s.h>
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static QueueHandle_t soundQueue;
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int sndDone() {
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return uxQueueSpacesAvailable(soundQueue)<2;
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}
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#define SND_CHUNKSZ 32
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int sndPush(uint8_t *data, int volume) {
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uint32_t tmpb[SND_CHUNKSZ];
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int i=0;
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int len=370;
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while (i<len) {
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int plen=len-i;
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if (plen>SND_CHUNKSZ) plen=SND_CHUNKSZ;
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for (int j=0; j<plen; j++) {
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int s=*data;
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s=((s-128)>>(7-volume));
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// s=s/16;
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tmpb[j]=((s+128)<<8)+((s+128)<<24);
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data+=2;
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}
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i2s_write_bytes(0, (char*)tmpb, plen*4, portMAX_DELAY);
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i+=plen;
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}
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return 1;
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}
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void sndInit() {
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i2s_config_t cfg={
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.mode=I2S_MODE_DAC_BUILT_IN|I2S_MODE_TX|I2S_MODE_MASTER,
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.sample_rate=22000,
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.bits_per_sample=16,
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.channel_format=I2S_CHANNEL_FMT_RIGHT_LEFT,
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.communication_format=I2S_COMM_FORMAT_I2S_MSB,
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.intr_alloc_flags=0,
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.dma_buf_count=4,
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.dma_buf_len=1024/4
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};
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i2s_driver_install(0, &cfg, 4, &soundQueue);
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i2s_set_pin(0, NULL);
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i2s_set_dac_mode(I2S_DAC_CHANNEL_LEFT_EN);
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i2s_set_sample_rates(0, cfg.sample_rate);
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#if 1
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//I2S enables *both* DAC channels; we only need DAC2. DAC1 is connected to the select button.
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CLEAR_PERI_REG_MASK(RTC_IO_PAD_DAC1_REG, RTC_IO_PDAC1_DAC_XPD_FORCE_M);
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CLEAR_PERI_REG_MASK(RTC_IO_PAD_DAC1_REG, RTC_IO_PDAC1_XPD_DAC_M);
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gpio_config_t io_conf={
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.intr_type=GPIO_INTR_DISABLE,
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.mode=GPIO_MODE_INPUT,
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.pull_up_en=1,
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.pin_bit_mask=(1<<25)
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};
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gpio_config(&io_conf);
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#endif
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}
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