i2s.h
资源名称:SMDK2440.rar [点击查看]
上传用户:qiulin1960
上传日期:2013-10-16
资源大小:2844k
文件大小:5k
源码类别:
Windows CE
开发平台:
Windows_Unix
- //
- // Copyright (c) Microsoft Corporation. All rights reserved.
- //
- //
- // Use of this source code is subject to the terms of the Microsoft end-user
- // license agreement (EULA) under which you licensed this SOFTWARE PRODUCT.
- // If you did not accept the terms of the EULA, you are not authorized to use
- // this source code. For a copy of the EULA, please see the LICENSE.RTF on your
- // install media.
- //
- /*++
- THIS CODE AND INFORMATION IS PROVIDED "AS IS" WITHOUT WARRANTY OF
- ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING BUT NOT LIMITED TO
- THE IMPLIED WARRANTIES OF MERCHANTABILITY AND/OR FITNESS FOR A
- PARTICULAR PURPOSE.
- Module Name: I2S.CPP
- Abstract: I2S Interface Routines for Samsung SC2410 CPU
- Environment: Samsung SC2410 CPU and Windows 3.0 (or later)
- -*/
- #include <windows.h>
- #include "s2440.h"
- //===================== Register Configuration Constants ======================
- #define IIS_INTERNAL_CLOCK_ENABLE (1<<17) // Enable CPU clock to IIS controller
- //----- GPIO Configuration Masks -----
- #define ENABLE_I2SSDO 0x00000200
- #define ENABLE_I2SSDI 0x00000080
- #define ENABLE_I2SCDCLK 0x00000020
- #define ENABLE_I2SSCLK 0x00000008
- #define ENABLE_I2SLRCLK 0x00000002
- #define DISABLE_I2S_PULLUPS 0x0000001F
- //----- Register definitions for IISCON control register (global config register) -----
- #define LR_CHANNEL_INDEX 0x00000100 // Left/right channel index (read-only)
- #define TRANSMIT_FIFO_READY 0x00000080 // Indicates transmit FIFO is ready (read-only)
- #define RECEIVE_FIFO_READY 0x00000040 // Indicates receive FIFO is ready (read-only)
- #define TRANSMIT_DMA_REQUEST_ENABLE 0x00000020 // Enables transmit DMA request
- #define RECEIVE_DMA_REQUEST_ENABLE 0x00000010 // Enables receive DMA request
- #define TRANSMIT_IDLE_CMD 0x00000008 // Pauses transmit
- #define RECEIVE_IDLE_CMD 0x00000004 // Pauses receive
- #define IIS_PRESCALER_ENABLE 0x00000002 // Enables clock prescaler
- #define IIS_INTERFACE_ENABLE 0x00000001 // Enables IIS controller
- //----- Register definitions for IISMOD status register (global status register) -----
- #define IIS_MASTER_MODE 0x00000000 // Selects master/slave mode
- #define IIS_SLAVE_MODE 0x00000100
- #define IIS_NOTRANSFER_MODE 0x00000000 // Selects transfer mode
- #define IIS_RECEIVE_MODE 0x00000040
- #define IIS_TRANSMIT_MODE 0x00000080
- #define IIS_TRANSMIT_RECEIVE_MODE 0x000000C0
- #define ACTIVE_CHANNEL_LEFT 0x00000000 // Selects active channel
- #define ACTIVE_CHANNEL_RIGHT 0x00000020
- #define SERIAL_INTERFACE_IIS_COMPAT 0x00000000 // Selects serial interface format
- #define SERIAL_INTERFACE_MSBL_COMPAT 0x00000010
- #define DATA_8_BITS_PER_CHANNEL 0x00000000 // Selects # of data bits per channel
- #define DATA_16_BITS_PER_CHANNEL 0x00000008
- #define MASTER_CLOCK_FREQ_256fs 0x00000000 // Selects master clock frequency
- #define MASTER_CLOCK_FREQ_384fs 0x00000004
- #define SERIAL_BIT_CLOCK_FREQ_16fs 0x00000000 // Selects serial data bit clock frequency
- #define SERIAL_BIT_CLOCK_FREQ_32fs 0x00000001
- #define SERIAL_BIT_CLOCK_FREQ_48fs 0x00000002
- //----- Register definitions for IISPSR control register (global config register) -----
- // FORMAT: bits[9:5] - Prescaler Control A
- // bits[4:0] - Prescaler Control B
- //
- // Range: 0-31 and the division factor is N+1 (a.k.a. 1-32)
- //
- // The I2SLRCLK frequency is determined as follows:
- //
- // I2SLRCLK = CODECLK / I2SCDCLK and (prescaler+1) = PCLK / CODECLK
- //
- // Thus, rearranging the equations a bit we can see that:
- //
- // prescaler = (PCLK / CODECLK) - 1
- // or
- // prescaler = ((PCLK / (IS2LRCLK * IS2CDCLK)) - 1
- //
- // Here are some popular values for IS2LRCLK:
- //
- #define IS2LRCLK_800 800
- #define IS2LRCLK_11025 11025
- #define IS2LRCLK_16000 16000
- #define IS2LRCLK_22050 22050
- #define IS2LRCLK_32000 32000
- #define IS2LRCLK_44100 44100
- #define IS2LRCLK_48000 48000
- #define IS2LRCLK_64000 64000
- #define IS2LRCLK_88200 88200
- #define IS2LRCLK_96000 96000
- //----- Register definitions for IISFCON control register (global config register) -----
- #define TRANSMIT_FIFO_ACCESS_NORMAL 0x00000000 // Selects the transmit FIFO access mode
- #define TRANSMIT_FIFO_ACCESS_DMA 0x00008000
- #define RECEIVE_FIFO_ACCESS_NORMAL 0x00000000 // Selects the receive FIFO access mode
- #define RECEIVE_FIFO_ACCESS_DMA 0x00004000
- #define TRANSMIT_FIFO_ENABLE 0x00002000 // Enables transmit FIFO
- #define RECEIVE_FIFO_ENABLE 0x00001000 // Enables receive FIFO
- //
- // READ-ONLY Fields: bits[11:6] - Transmit FIFO datacount
- // bits[5:0] - Receive FIFO datacount
- //----- Register definitions for IISFIFO control register (global config register) -----
- // NOTE: This register is used to access the transmit/receive FIFO
- #define MAX_TRANSMIT_FIFO_ENTRIES 24
- #define MAX_RECEIVE_FIFO_ENTRIES 24
- //=============================================================================
- //-------------------------- Public Interface ------------------------------
- BOOL I2S_Init();
- BOOL I2S_Deinit();
- BOOL I2S_WriteData(LPWORD lpBuff, DWORD dwLen);
- //-------------------- Private Interface (Helper routines) ------------------
- VOID StartI2SClock(VOID);
- VOID StopI2SClock(VOID);
- VOID SetI2SClockRate(DWORD ClockRate);