diff --git a/bootloader/sansa_as3525.c b/bootloader/sansa_as3525.c index b9975a9722..6f230c2628 100644 --- a/bootloader/sansa_as3525.c +++ b/bootloader/sansa_as3525.c @@ -28,10 +28,14 @@ #include "lcd.h" #include "common.h" #include "config.h" +#include "as3525-codec.h" int show_logo(void); void main(void) { + int i; + unsigned char buf[8]; + lcd_init_device(); lcd_clear_display(); @@ -43,6 +47,13 @@ void main(void) show_logo(); + /* show player id to demonstrate communication with codec part */ + as3525_codec_init(); + for (i = 0; i < 8; i++) { + buf[i] = as3525_codec_read(0x38 + i); + } + printf("ID: %02X%02X%02X%02X%02X%02X%02X%02X", buf[7], buf[6], buf[5], buf[4], buf[3], buf[2], buf[1], buf[0]); + #ifdef SANSA_CLIP /* Use hardware scrolling */ diff --git a/firmware/SOURCES b/firmware/SOURCES index 4407b0e8b9..7a93d058b4 100644 --- a/firmware/SOURCES +++ b/firmware/SOURCES @@ -1038,6 +1038,7 @@ target/arm/pcm-telechips.c #ifndef SIMULATOR target/arm/as3525/sansa-clip/lcd-ssd1303.c target/arm/as3525/sansa-clip/button-clip.c +target/arm/as3525/as3525-codec.c #endif /* !SIMULATOR */ #endif /* SANSA_CLIP */ @@ -1045,6 +1046,7 @@ target/arm/as3525/sansa-clip/button-clip.c #ifndef SIMULATOR target/arm/as3525/sansa-e200v2/lcd-e200v2.c target/arm/as3525/sansa-e200v2/button-e200v2.c +target/arm/as3525/as3525-codec.c #endif /* !SIMULATOR */ #endif /* SANSA_E200V2 */ @@ -1052,6 +1054,7 @@ target/arm/as3525/sansa-e200v2/button-e200v2.c #ifndef SIMULATOR target/arm/lcd-ssd1815.c target/arm/as3525/sansa-m200v2/button-m200v2.c +target/arm/as3525/as3525-codec.c #endif /* !SIMULATOR */ #endif /* SANSA_M200V2 */ diff --git a/firmware/target/arm/as3525/as3525-codec.c b/firmware/target/arm/as3525/as3525-codec.c new file mode 100644 index 0000000000..1de2f49e1a --- /dev/null +++ b/firmware/target/arm/as3525/as3525-codec.c @@ -0,0 +1,132 @@ +/*************************************************************************** + * __________ __ ___. + * Open \______ \ ____ ____ | | _\_ |__ _______ ___ + * Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ / + * Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < < + * Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \ + * \/ \/ \/ \/ \/ + * $Id: $ + * + * Copyright (C) 2008 by Bertrik Sikken + * + * This program 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. + * + * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY + * KIND, either express or implied. + * + ****************************************************************************/ + +/* + Provides access to the codec/charger/rtc/adc part of the as3525. + This part is on address 0x46 of the internal i2c bus in the as3525. + Registers in the codec part seem to be nearly identical to the registers + in the AS3514 (used in the "v1" versions of the sansa c200 and e200). + + I2C register description: + * I2C2_CNTRL needs to be set to 0x51 for transfers to work at all. + bit 1 indicates direction of transfer (0 = write, 1 = read) + * I2C2_SR (status register) indicates in bit 0 if a transfer is busy. + * I2C2_SLAD0 contains the i2c slave address to read from / write to. + * I2C2_CPSR0/1 is the divider from the peripheral clock to the i2c clock. + * I2C2_DACNT sets the number of bytes to transfer and actually starts it. + + When a transfer is attempted to a non-existing i2c slave address, + interrupt bit 7 is raised and DACNT is not decremented after the transfer. + */ + +#include "as3525-codec.h" +#include "as3525.h" + +#define AUDIO_I2C_ADDR 0x46 + +#define I2C2_DATA *((volatile unsigned int *)(I2C_AUDIO_BASE + 0x00)) +#define I2C2_SLAD0 *((volatile unsigned int *)(I2C_AUDIO_BASE + 0x04)) +#define I2C2_CNTRL *((volatile unsigned int *)(I2C_AUDIO_BASE + 0x0C)) +#define I2C2_DACNT *((volatile unsigned int *)(I2C_AUDIO_BASE + 0x10)) +#define I2C2_CPSR0 *((volatile unsigned int *)(I2C_AUDIO_BASE + 0x1C)) +#define I2C2_CPSR1 *((volatile unsigned int *)(I2C_AUDIO_BASE + 0x20)) +#define I2C2_IMR *((volatile unsigned int *)(I2C_AUDIO_BASE + 0x24)) +#define I2C2_RIS *((volatile unsigned int *)(I2C_AUDIO_BASE + 0x28)) +#define I2C2_MIS *((volatile unsigned int *)(I2C_AUDIO_BASE + 0x2C)) +#define I2C2_SR *((volatile unsigned int *)(I2C_AUDIO_BASE + 0x30)) +#define I2C2_INT_CLR *((volatile unsigned int *)(I2C_AUDIO_BASE + 0x40)) +#define I2C2_SADDR *((volatile unsigned int *)(I2C_AUDIO_BASE + 0x44)) + + +/* initialises the internal i2c bus and prepares for transfers to the codec */ +void as3525_codec_init(void) +{ + /* reset device */ + CCU_SRC = CCU_SRC_I2C_AUDIO_EN; + CCU_SRL = CCU_SRL_MAGIC_NUMBER; + CCU_SRL = 0; + + /* enable clock */ + CGU_PERI |= CGU_I2C_AUDIO_MASTER_CLOCK_ENABLE; + + /* prescaler for i2c clock */ + I2C2_CPSR0 = 60; /* 24 MHz / 400 kHz */ + I2C2_CPSR1 = 0; /* MSB */ + + /* set i2c slave address of codec part */ + I2C2_SLAD0 = AUDIO_I2C_ADDR << 1; + + I2C2_CNTRL = 0x51; +} + + +/* returns != 0 when busy */ +static int i2c_busy(void) +{ + return (I2C2_SR & 1); +} + + +/* returns 0 on success, <0 otherwise */ +int as3525_codec_write(int index, int value) +{ + if (index == 0x21) { + /* prevent setting of the LREG_CP_not bit */ + value &= ~(1 << 5); + } + + /* check if still busy */ + if (i2c_busy()) { + return -1; + } + + /* start transfer */ + I2C2_SADDR = index; + I2C2_CNTRL &= ~(1 << 1); + I2C2_DATA = value; + I2C2_DACNT = 1; + + /* wait for transfer*/ + while (i2c_busy()); + + return 0; +} + + +/* returns value read on success, <0 otherwise */ +int as3525_codec_read(int index) +{ + /* check if still busy */ + if (i2c_busy()) { + return -1; + } + + /* start transfer */ + I2C2_SADDR = index; + I2C2_CNTRL |= (1 << 1); + I2C2_DACNT = 1; + + /* wait for transfer*/ + while (i2c_busy()); + + return I2C2_DATA; +} + diff --git a/firmware/target/arm/as3525/as3525-codec.h b/firmware/target/arm/as3525/as3525-codec.h new file mode 100644 index 0000000000..9d694554c6 --- /dev/null +++ b/firmware/target/arm/as3525/as3525-codec.h @@ -0,0 +1,27 @@ +/*************************************************************************** + * __________ __ ___. + * Open \______ \ ____ ____ | | _\_ |__ _______ ___ + * Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ / + * Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < < + * Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \ + * \/ \/ \/ \/ \/ + * $Id: $ + * + * Copyright (C) 2008 by Bertrik Sikken + * + * This program 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. + * + * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY + * KIND, either express or implied. + * + ****************************************************************************/ + +void as3525_codec_init(void); + +int as3525_codec_write(int index, int value); +int as3525_codec_read(int index); + +