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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/***************************************************************************
* wm8523.c
*
* Tue Jun 4 20:47:15 CEST 2013
* Copyright 2013 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 "wm8523.h"
#include <string.h>
#include <cli.h>
#include "spi.h"
#define WM8523_WRITE 0
#define WM8523_READ 1
typedef union {
struct __attribute__ ((packed)) {
uint8_t rw:1; ///< See WM8523_WRITE and WM8523_READ
uint8_t reg:7; ///< See page 35 in the WM8523 manual.
uint16_t data;
} val;
uint8_t data[3];
} WM8523_transfer_t;
void WM8523_init()
{
cli_write("sizeof: %d", sizeof(WM8523_transfer_t));
spi_init();
}
void WM8523_deinit()
{
spi_deinit();
}
void WM8523_write(uint8_t reg, uint16_t data)
{
WM8523_transfer_t t;
t.val.rw = WM8523_WRITE;
t.val.reg = reg;
t.val.data = data;
WM8523_transfer_t r;
r.val.data = 0xffff;
spi_read_write(t.data, r.data, 3);
}
uint16_t WM8523_read(uint8_t reg)
{
WM8523_transfer_t t;
t.val.rw = WM8523_READ;
t.val.reg = reg;
t.val.data = 0xffff;
WM8523_transfer_t r;
spi_read_write(t.data, r.data, 3);
return r.data[0] | (r.data[1] << 8);//r.val.data;
}
/**
Volume update registers R06h and R07h are unavailable in SPI control mode.
To use volume update in software control mode, I2C mode must be used.
*/
void WM8523_configure()
{
spi_configure();
uint16_t id = WM8523_read(0); // Read chip id from reg0.
cli_write("=%d=", id); // should be 34595 (0x8523)
}
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