230 lines
7.5 KiB
C
230 lines
7.5 KiB
C
/*
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Copyright 2005, Freie Universitaet Berlin. All rights reserved.
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These sources were developed at the Freie Universität Berlin, Computer
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Systems and Telematics group.
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Redistribution and use in source and binary forms, with or without
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modification, are permitted provided that the following conditions are
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met:
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- Redistributions of source code must retain the above copyright
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notice, this list of conditions and the following disclaimer.
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- Redistributions in binary form must reproduce the above copyright
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notice, this list of conditions and the following disclaimer in the
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documentation and/or other materials provided with the distribution.
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- Neither the name of Freie Universitaet Berlin (FUB) nor the names of its
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contributors may be used to endorse or promote products derived from
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this software without specific prior written permission.
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This software is provided by FUB and the contributors on an "as is"
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basis, without any representations or warranties of any kind, express
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or implied including, but not limited to, representations or
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warranties of non-infringement, merchantability or fitness for a
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particular purpose. In no event shall FUB or contributors be liable
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for any direct, indirect, incidental, special, exemplary, or
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consequential damages (including, but not limited to, procurement of
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substitute goods or services; loss of use, data, or profits; or
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business interruption) however caused and on any theory of liability,
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whether in contract, strict liability, or tort (including negligence
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or otherwise) arising in any way out of the use of this software, even
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if advised of the possibility of such damage.
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This implementation was developed by the CST group at the FUB.
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For documentation and questions please use the web site
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http://scatterweb.mi.fu-berlin.de and the mailinglist
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scatterweb@lists.spline.inf.fu-berlin.de (subscription via the Website).
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Berlin, 2005
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*/
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/**
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* Part of the source code from ScatterWeb 2.2 (ScatterWeb.{Data,System}.c)
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* released by Freie Universitaet Berlin has been reworked and
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* reformatted to fit the Contiki ESB port.
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*/
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#include "contiki-conf.h"
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#include "dev/ds1629.h"
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#include <io.h>
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#define SDA_HIGH (P5OUT |= 0x01) /* RTC data line high */
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#define SDA_LOW (P5OUT &= 0xFE) /* RTC data line low */
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#define SCL_HIGH (P5OUT |= 0x02) /* RTC clock line high */
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#define SCL_LOW (P5OUT &= 0xFD) /* RTC clock line low */
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#define BUS_READ 0x9F
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#define BUS_WRITE 0x9E
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#define ACC_CSR 0xAC /* Access Configuration/Control Register */
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#define ACC_CLOCK 0xC0 /* Access Clock Register */
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#define ACC_CLOCK_ALARM 0xC7 /* Access Clock Alarm Register */
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#define ACC_TH 0xA1 /* Access Thermostat Setpoint High */
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#define ACC_TL 0xA2 /* Access Thermostat Setpoint Low */
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#define ACC_CSRAM 0x17 /* Access Clock 32 byte SRAM */
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#define ACC_RT 0xAA /* Access Read Temperatur Register */
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#define CSR_OS1 (0x80)
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#define CSR_OS0 (0x40)
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#define CSR_A1 (0x20)
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#define CSR_A0 (0x10)
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#define CSR_CNV (0x04)
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#define CSR_POL (0x02)
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#define CSR_1SH (0x01)
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#define CSR_DEFAULT (CSR_OS1 + CSR_OS0 + CSR_A1 + CSR_CNV + CSR_1SH + CSR_POL)
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/**
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* Temperature type (built on a signed int). It's a signed (twos complement)
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* fixed point value with 8 bits before comma and 7 bits after. So Bit 15 is
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* sign, Bit14-7 is before comma and Bit 6-0 after comma.
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*
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* @since 2.0
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*/
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typedef union { unsigned int u; signed int s; } temp_t;
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/*--------------------------------------------------------------------------*/
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/* Puts the start condition on bus. */
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static void
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cl_start(void)
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{
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P5DIR |= 0x03; /* ensure: P50(SDA), P51(SCL) output */
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SCL_LOW; _NOP(); _NOP();
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SDA_HIGH; _NOP(); _NOP();
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SCL_HIGH; _NOP(); _NOP();
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SDA_LOW; _NOP(); _NOP();
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SCL_LOW; _NOP(); _NOP();
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}
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/*--------------------------------------------------------------------------*/
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/* Puts the stop condition on bus. */
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static void
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cl_stop()
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{
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SCL_LOW; _NOP(); _NOP();
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SDA_LOW; _NOP(); _NOP();
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SCL_HIGH; _NOP(); _NOP();
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SDA_HIGH; _NOP(); _NOP();
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SCL_LOW; _NOP(); _NOP();
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P5DIR &= ~0x03;
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}
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/*--------------------------------------------------------------------------*/
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/* Writes a byte on the bus, returns the acknowledge bit. */
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static u16_t
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cl_writeOnBus(u8_t byte)
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{
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u16_t i, ack;
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for(i=0;i<8;i++) {
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if(byte & 0x80) SDA_HIGH; else SDA_LOW;
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SCL_HIGH;
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byte = byte << 1; _NOP();
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SCL_LOW; _NOP();
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}
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/* check ack */
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P5DIR &= 0xFE; /* P50(SDA) input */
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SCL_HIGH;
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if(P5IN & 0x01) ack = 0; else ack = 1; /* test if ack=0, else error */
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_NOP();
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SCL_LOW;
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P5DIR |= 0x01; /* P50(SDA) output */
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return ack;
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}
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/*--------------------------------------------------------------------------*/
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static u8_t
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cl_readFromBus(u16_t ack)
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{
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u16_t i;
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u8_t byte = 0;
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P5DIR &= 0xFE; /* P50(SDA) input */
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for(i=0;i<8;i++) {
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byte = byte << 1;
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SCL_HIGH;
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if(P5IN & 0x01) byte |= 0x01; else byte &= 0xFE;
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SCL_LOW;
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}
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P5DIR |= 0x01; /* P50(SDA) output */
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if(ack) SDA_LOW; else SDA_HIGH;
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SCL_HIGH;
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SCL_LOW;
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return byte;
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}
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/*--------------------------------------------------------------------------*/
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static u16_t
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getReg16bit(u8_t acc, u16_t bitmask)
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{
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u16_t config = 0;
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do cl_start();
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while(!cl_writeOnBus(BUS_WRITE));
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cl_writeOnBus(acc);
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cl_start();
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cl_writeOnBus(BUS_READ);
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config = cl_readFromBus(1);
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config = config << 8;
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config += cl_readFromBus(0);
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cl_stop();
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config &= bitmask;
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_NOP();
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_NOP();
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return config;
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}
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/*--------------------------------------------------------------------------*/
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/* Only first 8 bit of Configuration Status Register can be set */
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static void
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setCSReg(u8_t setting)
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{
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do cl_start();
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while(!cl_writeOnBus(BUS_WRITE));
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cl_writeOnBus(ACC_CSR);
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cl_writeOnBus(setting);
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cl_stop();
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_NOP();
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_NOP();
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_NOP();
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_NOP();
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}
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/*--------------------------------------------------------------------------*/
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static void
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System_startConversion(void)
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{
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do cl_start(); /* do start until BUS_WRITE is acked */
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while(!cl_writeOnBus(BUS_WRITE)); /* control byte */
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cl_writeOnBus(0xEE); /* start conversion */
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cl_stop();
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}
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/*--------------------------------------------------------------------------*/
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/* RTC initialization. Initializes RTC with ::CSR_DEFAULT. */
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static void
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initClock(void)
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{
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u8_t csr = getReg16bit(ACC_CSR,0xFF00) >> 8;
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if(csr!=CSR_DEFAULT) setCSReg(CSR_DEFAULT); /* if desired config isnt in clock => set it */
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/* IMPORTANT: Ensure quartz is generating 32768 Hz */
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/* (sometimes CH bit gets set when clock is read while reset) */
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do cl_start(); /* Do start until BUS_WRITE is acked. */
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while(!cl_writeOnBus(BUS_WRITE)); /* Send control byte */
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cl_writeOnBus(ACC_CLOCK); /* Send command byte ::ACC_CLOCK. */
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cl_writeOnBus(0x00); /* Send starting address 0x00. */
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cl_writeOnBus(0x00); /* Set CH to 0, tseconds and seconds will also be reset! */
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cl_stop(); /* Stop condition. */
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}
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/*--------------------------------------------------------------------------*/
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void
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ds1629_init()
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{
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initClock();
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}
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/*--------------------------------------------------------------------------*/
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void
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ds1629_start()
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{
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System_startConversion();
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}
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/*--------------------------------------------------------------------------*/
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signed int
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ds1629_temperature()
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{
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temp_t temperature;
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ds1629_start();
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temperature.u = getReg16bit(ACC_RT,0xFFFF);
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return temperature.s;
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}
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