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/**
* @file i2s.c
* @brief Inter-Integrated Sound (I2S) driver implementation.
*/
/* ****************************************************************************
* Copyright (C) 2017 Maxim Integrated Products, Inc., All Rights Reserved.
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the "Software"),
* to deal in the Software without restriction, including without limitation
* the rights to use, copy, modify, merge, publish, distribute, sublicense,
* and/or sell copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included
* in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
* OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
* IN NO EVENT SHALL MAXIM INTEGRATED BE LIABLE FOR ANY CLAIM, DAMAGES
* OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
* ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
* OTHER DEALINGS IN THE SOFTWARE.
*
* Except as contained in this notice, the name of Maxim Integrated
* Products, Inc. shall not be used except as stated in the Maxim Integrated
* Products, Inc. Branding Policy.
*
* The mere transfer of this software does not imply any licenses
* of trade secrets, proprietary technology, copyrights, patents,
* trademarks, maskwork rights, or any other form of intellectual
* property whatsoever. Maxim Integrated Products, Inc. retains all
* ownership rights.
*
* $Date: 2018-12-18 15:37:22 -0600 (Tue, 18 Dec 2018) $
* $Revision: 40072 $
*
*************************************************************************** */
#include <stddef.h>
#include <stdint.h>
#include "mxc_config.h"
#include "mxc_assert.h"
#include "mxc_lock.h"
#include "mxc_sys.h"
#include "dma.h"
#include "i2s.h"
#define I2S_CHANNELS 2
#define I2S_WIDTH 16
int dma_channel = -1;
int I2S_Init(const i2s_cfg_t *cfg, void (*dma_ctz_cb)(int, int), const sys_cfg_i2s_t* sys_cfg_i2s)
{
unsigned int i2s_clk, baud;
uint16_t clocks;
uint8_t ctz_en;
int err;
SYS_I2S_Init(sys_cfg_i2s);
/* Setup SPI_MSS as master, mode 0, 16 bit transfers as I2S Requires */
MXC_SPIMSS->ctrl = MXC_F_SPIMSS_CTRL_MMEN;
MXC_SPIMSS->mod = MXC_V_SPIMSS_MOD_NUMBITS_BITS16 | MXC_F_SPIMSS_MOD_SSIO;
MXC_SPIMSS->dma = MXC_S_SPIMSS_DMA_TX_FIFO_LEVEL_ENTRIES8;
/* Setup I2S register from i2s_cfg_t */
MXC_SPIMSS->i2s_ctrl = cfg->left_justify << MXC_F_SPIMSS_I2S_CTRL_I2S_LJ_POS |
cfg->mono_audio << MXC_F_SPIMSS_I2S_CTRL_I2S_MONO_POS;
/* Determine divisor for baud rate generator */
baud = cfg->sample_rate*I2S_CHANNELS*I2S_WIDTH;
i2s_clk = SYS_I2S_GetFreq(MXC_SPIMSS);
if (i2s_clk/4 < baud) {
return E_BAD_PARAM;
}
clocks = i2s_clk / (2*baud);
MXC_SPIMSS->brg = clocks;
/* Prepare SPIMSS DMA register for DMA setup */
if (dma_ctz_cb == NULL) {
ctz_en = 0;
} else {
ctz_en = 1;
}
/* Initialize DMA */
if (cfg->audio_direction % 2) {
MXC_SPIMSS->dma |= MXC_F_SPIMSS_DMA_TX_DMA_EN | MXC_F_SPIMSS_DMA_TX_FIFO_CLEAR;
if ((err = DMA_Init()) != E_NO_ERROR) {
if (err != E_BAD_STATE) {
return err;
}
}
if ((err = DMA_AcquireChannel()) < 0) {
return err;
}
dma_channel = err;
DMA_ConfigChannel(dma_channel, DMA_PRIO_MEDHIGH,
sys_cfg_i2s->dma_reqsel_tx, 1, DMA_TIMEOUT_512_CLK,
DMA_PRESCALE_DIV64K, DMA_WIDTH_HALFWORD, 1,
DMA_WIDTH_HALFWORD, 0, 16, 0, ctz_en);
if (ctz_en) {
DMA_SetCallback(dma_channel, dma_ctz_cb);
DMA_EnableInterrupt(dma_channel);
}
}
if (cfg->audio_direction / 2) {
MXC_SPIMSS->dma = MXC_F_SPIMSS_DMA_RX_DMA_EN | MXC_F_SPIMSS_DMA_RX_FIFO_CLEAR;
if ((err = DMA_Init()) != E_NO_ERROR) {
if (err != E_BAD_STATE) { //DMA already initialized
return err;
}
}
if ((err = DMA_AcquireChannel()) < 0) {
return err;
}
dma_channel = err;
DMA_ConfigChannel(dma_channel, DMA_PRIO_MEDHIGH,
sys_cfg_i2s->dma_reqsel_rx, 1, DMA_TIMEOUT_512_CLK,
DMA_PRESCALE_DIV64K, DMA_WIDTH_HALFWORD, 0,
DMA_WIDTH_HALFWORD, 1, 8, 0, ctz_en);
if (ctz_en) {
DMA_SetCallback(dma_channel, dma_ctz_cb);
DMA_EnableInterrupt(dma_channel);
}
}
I2S_DMA_SetAddrCnt(cfg->dma_src_addr, cfg->dma_dst_addr, cfg->dma_cnt);
if (cfg->dma_reload_en) {
I2S_DMA_SetReload(cfg->dma_src_addr, cfg->dma_dst_addr, cfg->dma_cnt);
}
if (cfg->start_immediately) {
return I2S_Start();
}
return E_NO_ERROR;
}
int I2S_Shutdown(void)
{
MXC_SPIMSS->ctrl = 0;
MXC_SPIMSS->i2s_ctrl = 0;
MXC_SPIMSS->brg = 0;
MXC_SPIMSS->mod = 0;
MXC_SPIMSS->dma = 0;
SYS_I2S_Shutdown();
return DMA_ReleaseChannel(dma_channel);
}
int I2S_Mute(void)
{
MXC_SPIMSS->i2s_ctrl |= MXC_F_SPIMSS_I2S_CTRL_I2S_MUTE;
return E_NO_ERROR;
}
int I2S_Unmute(void)
{
MXC_SPIMSS->i2s_ctrl &= ~MXC_F_SPIMSS_I2S_CTRL_I2S_MUTE;
return E_NO_ERROR;
}
int I2S_Pause(void)
{
MXC_SPIMSS->i2s_ctrl |= MXC_F_SPIMSS_I2S_CTRL_I2S_PAUSE;
return E_NO_ERROR;
}
int I2S_Unpause(void)
{
MXC_SPIMSS->i2s_ctrl &= ~MXC_F_SPIMSS_I2S_CTRL_I2S_PAUSE;
return E_NO_ERROR;
}
int I2S_Stop(void)
{
MXC_SPIMSS->ctrl &= ~MXC_F_SPIMSS_CTRL_SPIEN;
MXC_SPIMSS->i2s_ctrl &= ~MXC_F_SPIMSS_I2S_CTRL_I2S_EN;
return DMA_Stop(dma_channel);
}
int I2S_Start(void)
{
MXC_SPIMSS->ctrl |= MXC_F_SPIMSS_CTRL_SPIEN;
MXC_SPIMSS->i2s_ctrl |= MXC_F_SPIMSS_I2S_CTRL_I2S_EN;
return DMA_Start(dma_channel);
}
int I2S_DMA_ClearFlags(void)
{
return DMA_ClearFlags(dma_channel);
}
int I2S_DMA_SetAddrCnt(void *src_addr, void *dst_addr, unsigned int count)
{
return DMA_SetSrcDstCnt(dma_channel, src_addr, dst_addr, count);
}
int I2S_DMA_SetReload(void *src_addr, void *dst_addr, unsigned int count)
{
return DMA_SetReload(dma_channel, src_addr, dst_addr, count);
}
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