From 9dc67828a9906498a16fd4ad55ae5319cc934dd1 Mon Sep 17 00:00:00 2001 From: Robert Kukla Date: Sun, 3 Feb 2008 18:15:39 +0000 Subject: mrobe 100: real time clock (if anybody recognises the RTC chip let me know) git-svn-id: svn://svn.rockbox.org/rockbox/trunk@16208 a1c6a512-1295-4272-9138-f99709370657 --- firmware/target/coldfire/iriver/h100/sw_i2c-h100.c | 269 --------------------- 1 file changed, 269 deletions(-) delete mode 100644 firmware/target/coldfire/iriver/h100/sw_i2c-h100.c (limited to 'firmware/target/coldfire') diff --git a/firmware/target/coldfire/iriver/h100/sw_i2c-h100.c b/firmware/target/coldfire/iriver/h100/sw_i2c-h100.c deleted file mode 100644 index 3b2cdc4042..0000000000 --- a/firmware/target/coldfire/iriver/h100/sw_i2c-h100.c +++ /dev/null @@ -1,269 +0,0 @@ -/*************************************************************************** - * __________ __ ___. - * Open \______ \ ____ ____ | | _\_ |__ _______ ___ - * Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ / - * Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < < - * Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \ - * \/ \/ \/ \/ \/ - * $Id$ - * - * Copyright (C) 2006 by Miika Pekkarinen - * - * All files in this archive are subject to the GNU General Public License. - * See the file COPYING in the source tree root for full license agreement. - * - * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY - * KIND, either express or implied. - * - ****************************************************************************/ -#include "system.h" -#include "logf.h" -#include "inttypes.h" - -#include "sw_i2c.h" - -/** - * I2C-functions are copied and ported from fmradio.c. - * later fixed, adapted and moved to a seperate file so they can be re-used by the rtc-ds1339c code by Robert Kukla - */ - -/* cute little functions, atomic read-modify-write */ - -/* SCL is GPIO, 12 */ -#define SCL ( 0x00001000 & GPIO_READ) -#define SCL_OUT_LO and_l(~0x00001000, &GPIO_OUT) -#define SCL_LO or_l( 0x00001000, &GPIO_ENABLE) -#define SCL_HI and_l(~0x00001000, &GPIO_ENABLE) - -/* SDA is GPIO1, 13 */ -#define SDA ( 0x00002000 & GPIO1_READ) -#define SDA_OUT_LO and_l(~0x00002000, &GPIO1_OUT) -#define SDA_LO or_l( 0x00002000, &GPIO1_ENABLE) -#define SDA_HI and_l(~0x00002000, &GPIO1_ENABLE) - -/* delay loop to achieve 400kHz at 120MHz CPU frequency */ -#define DELAY \ - ({ \ - int _x_; \ - asm volatile ( \ - "move.l #21, %[_x_] \r\n" \ - "1: \r\n" \ - "subq.l #1, %[_x_] \r\n" \ - "bhi.b 1b \r\n" \ - : [_x_]"=&d"(_x_) \ - ); \ - }) - -void sw_i2c_init(void) -{ - or_l(0x00001000, &GPIO_FUNCTION); - or_l(0x00002000, &GPIO1_FUNCTION); - SDA_HI; - SCL_HI; - SDA_OUT_LO; - SCL_OUT_LO; -} - -/* in: C=? D=? - * out: C=L D=L - */ -static void sw_i2c_start(void) -{ - SCL_LO; - DELAY; - SDA_HI; - DELAY; - SCL_HI; - DELAY; - SDA_LO; - DELAY; - SCL_LO; -} - -/* in: C=L D=? - * out: C=H D=H - */ -static void sw_i2c_stop(void) -{ - SDA_LO; - DELAY; - SCL_HI; - DELAY; - SDA_HI; -} - -/* in: C=L D=H - * out: C=L D=L - */ -static void sw_i2c_ack(void) -{ - SDA_LO; - DELAY; - - SCL_HI; - DELAY; - SCL_LO; -} - -/* in: C=L D=H - * out: C=L D=H - */ -static void sw_i2c_nack(void) -{ - SDA_HI; /* redundant */ - DELAY; - - SCL_HI; - DELAY; - SCL_LO; -} - -/* in: C=L D=? - * out: C=L D=H - */ -static bool sw_i2c_getack(void) -{ - bool ret = true; -/* int count = 10; */ - - SDA_HI; /* sets to input */ - DELAY; - SCL_HI; - DELAY; - -/* while (SDA && count--) */ -/* DELAY; */ - - if (SDA) - /* ack failed */ - ret = false; - - SCL_LO; - - return ret; -} - -/* in: C=L D=? - * out: C=L D=? - */ -static void sw_i2c_outb(unsigned char byte) -{ - int i; - - /* clock out each bit, MSB first */ - for ( i=0x80; i; i>>=1 ) - { - if ( i & byte ) - SDA_HI; - else - SDA_LO; - DELAY; - - SCL_HI; - DELAY; - SCL_LO; - } -} - -/* in: C=L D=? - * out: C=L D=H - */ -static unsigned char sw_i2c_inb(void) -{ - int i; - unsigned char byte = 0; - - SDA_HI; /* sets to input */ - - /* clock in each bit, MSB first */ - for ( i=0x80; i; i>>=1 ) - { - DELAY; - do { - SCL_HI; - DELAY; - } - while(SCL==0); /* wait for any SCL clock stretching */ - if ( SDA ) - byte |= i; - SCL_LO; - } - - return byte; -} - -int sw_i2c_write(unsigned char chip, unsigned char location, const unsigned char* buf, int count) -{ - int i; - - sw_i2c_start(); - sw_i2c_outb((chip & 0xfe) | SW_I2C_WRITE); - if (!sw_i2c_getack()) - { - sw_i2c_stop(); - return -1; - } - - sw_i2c_outb(location); - if (!sw_i2c_getack()) - { - sw_i2c_stop(); - return -2; - } - - for (i=0; i