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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/***************************************************************************
* i2stest.c
*
* Mon Sep 1 20:25:48 CEST 2014
* Copyright 2014 Bent Bisballe Nyeng
* deva@aasimon.org
****************************************************************************/
/*
* This file is part of Pedal2Metal.
*
* Pedal2Metal 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.
*
* Pedal2Metal 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 Pedal2Metal; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
*/
#include <i2s.h>
#include <led.h>
#include <LPC17xx.h>
#include <cli.h>
#include "../test.h"
#include "../../src/sample.h"
unsigned int size = sizeof(samples) / sizeof(short);
static uint32_t cnt = 0;
static int num = 0;
#if 1
void I2S_IRQHandler (void)
{
num = 8 - i2s_get_state_tx_level();
for(int i = 0; i < num; i++) {
i2s_write_pcm_16_stereo(samples[cnt % size] * 10,
samples[cnt % size] * 10);
//if((cnt % 24000) == 0) led_toggle();
//i2s_write_pcm_16_stereo(cnt, cnt);
// if(cnt > (1<<16)) cnt = 0;
cnt++;
}
/*
uint32_t RxCount = 0;
if ( LPC_I2S->I2SSTATE & 0x01 )
{
RxCount = (LPC_I2S->I2SSTATE >> 8) & 0xFF;
if ( (RxCount != RXFIFO_EMPTY) && !I2SRXDone )
{
while ( RxCount > 0 )
{
if ( I2SReadLength == BUFSIZE )
{
LPC_I2S->I2SDAI |= ((0x01 << 3) | (0x01 << 4));
LPC_I2S->I2SIRQ &= ~(0x01 << 0); // Disable RX
I2SRXDone = 1;
break;
}
else
{
I2SRXBuffer[I2SReadLength++] = LPC_I2S->I2SRXFIFO;
}
RxCount--;
}
}
}
return;
*/
}
#endif
int main (void)
{
led_init();
cli_init();
/*
// From: tools/clkcalc 48000 16 2
int pclkdiv = 8;
int bitrate = 3;
int x = 57;
int y = 59;
// err = 16.949153 bits/second
int bitwidth = 16;
int channels = 2;
int res = i2s_init(pclkdiv, bitrate, x, y, bitwidth, channels);
*/
int res = i2s_clkcalc_init(48000, 16, 2);
if(res) error();
// BUG? 4pin mode = 0 works for some reason...?
i2s_set_tx_mode_control(CLK_TX_SRC, 0, 1);
// i2s_tx_reset_fifo();
/*
// Set up IRQ
uint32_t *i2sirq = (uint32_t*)0x400A801C;
// *i2sirq &= ~(0b1111 << 16); // Reset tx irq depth
int depth = 4;
*i2sirq |= ((depth & 0b1111) << 16); // Set tx irq depth
*i2sirq |= 0b1 << 1; // Enable IRQ, pg. 479 table 412
NVIC_EnableIRQ(I2S_IRQn); // I2S_IRQn = 27;
*/
i2s_tx_start();
cli_printf("loop...\n");
// int32_t *fifo = (int32_t*)0x400A8008;
while(1) {
while(i2s_get_state_tx_level() > 7) {}
// i2s_write_pcm_16_stereo(cnt, cnt);
// *fifo = cnt;
// *fifo = (cnt / 40) | (cnt / 40) << 16;
if(cnt < size) {
i2s_write_pcm_16_stereo((samples[cnt] - 485) * 10,
(samples[cnt] - 485) * 10);
} else {
// repeat last sample
i2s_write_pcm_16_stereo(0, 0);
}
if(cnt > size * 10) cnt = 0;
// if(cnt > 64000) cnt = 0;
cnt++;
}
}
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