audio_dma.c

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/************************************************************************//**
 * \file heivs/audio_dma.c
 * \brief ARMEBS4 audio
 * \author marc dot pignat at hevs dot ch & Pascal Sartoretti (sap at hevs dot ch)
 *
 * This file has been split from audio.c so the buffer is not linked in when the
 * functions are unused
 ***************************************************************************/

#include "heivs/audio.h"
#include "heivs/audio_stm32.h"
#include <string.h>

static uint32_t buffer[2][512/sizeof(uint32_t)];

struct tx_t
{
    void (*done_handler)(const void *);
    const void *data;
    volatile uint32_t len;
};

static struct tx_t tx;

static void l_done_handler(const void *data)
{
    size_t len = min(tx.len, sizeof(buffer[0]));
    tx.len -= len;

    if (len == 0)
    {
        Audio_Stream_Play_Stop();
        if (tx.done_handler)
        {
            tx.done_handler(tx.data);
        }
    }
    else
    {
        AudioSTM32_Stream_Play(tx.data);
        tx.data += len;
    }
}

status_e Audio_DMA_Play(const void *data, uint32_t length, void (*done)(const void *))
{
    status_e status;
    tx.done_handler = done;
    tx.len = length;
    tx.data = data;
    status = Audio_Stream_Play_Init(sizeof(buffer[0]), &buffer[0], &buffer[1], l_done_handler);
    if (status != NO_ERROR)
    {
        return status;
    }

    return NO_ERROR;
}

status_e Audio_DMA_Play_Status(void)
{
    if (tx.len > 0)
    {
        return ERROR_AGAIN;
    }

    return NO_ERROR;
}