104 lines
2.2 KiB
C
104 lines
2.2 KiB
C
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#ifndef _PCM_H
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#define _PCM_H
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#include "task/task.h"
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#include "platform.h"
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//#define DEBUG_PIN 2
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#ifdef DEBUG_PIN
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# define dbg_platform_gpio_write(level) platform_gpio_write( DEBUG_PIN, level )
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# define dbg_platform_gpio_mode(mode, pull) platform_gpio_mode( DEBUG_PIN, mode, pull)
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#else
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# define dbg_platform_gpio_write(level)
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# define dbg_platform_gpio_mode(mode, pull)
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#endif
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#define BASE_RATE 1000000
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enum pcm_driver_index {
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PCM_DRIVER_SD = 0,
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PCM_DRIVER_END = 1
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};
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enum pcm_rate_index {
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PCM_RATE_1K = 0,
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PCM_RATE_2K = 1,
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PCM_RATE_4K = 2,
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PCM_RATE_5K = 3,
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PCM_RATE_8K = 4,
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PCM_RATE_10K = 5,
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PCM_RATE_12K = 6,
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PCM_RATE_16K = 7,
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};
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static const uint16_t pcm_rate_def[] = {BASE_RATE / 1000, BASE_RATE / 2000, BASE_RATE / 4000,
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BASE_RATE / 5000, BASE_RATE / 8000, BASE_RATE / 10000,
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BASE_RATE / 12000, BASE_RATE / 16000};
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typedef struct {
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// available bytes in buffer
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size_t len;
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// next read position
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size_t rpos;
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// empty flag
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uint8_t empty;
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// allocated size
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size_t buf_size;
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uint8_t *data;
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} pcm_buf_t;
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typedef struct {
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// selected sample rate
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int rate;
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// ISR throttle control
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// -1 = ISR and data task throttled
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// 1 = ISR throttled
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// 0 = all running
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sint8_t isr_throttled;
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// buffer selectors
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uint8_t rbuf_idx; // read by ISR
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uint8_t fbuf_idx; // fill by data task
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// callback fn refs
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int self_ref;
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int cb_data_ref, cb_drained_ref, cb_paused_ref, cb_stopped_ref, cb_vu_ref;
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// data buffers
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pcm_buf_t bufs[2];
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// vu measuring
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uint8_t vu_freq;
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uint16_t vu_req_samples, vu_samples_tmp;
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uint16_t vu_peak_tmp, vu_peak;
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// sigma-delta: output pin
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int pin;
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} cfg_t;
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typedef uint8_t (*drv_fn_t)(cfg_t *);
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typedef struct {
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drv_fn_t init;
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drv_fn_t close;
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drv_fn_t play;
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drv_fn_t record;
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drv_fn_t stop;
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} drv_t;
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typedef struct {
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cfg_t cfg;
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const drv_t *drv;
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} pud_t;
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void pcm_data_vu( task_param_t param, uint8 prio );
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void pcm_data_play( task_param_t param, uint8 prio );
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// task handles
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extern task_handle_t pcm_data_vu_task, pcm_data_play_task, pcm_start_play_task;
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#endif /* _PCM_H */
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