mirror of
https://github.com/oliverschmidt/contiki.git
synced 2024-12-23 01:29:33 +00:00
Moved to core/dev.
This commit is contained in:
nvt-se
parent
14f1b81e10
commit
0c9db3caa3
@ -1,345 +0,0 @@
|
||||
/*
|
||||
* Copyright (c) 2007, Swedish Institute of Computer Science
|
||||
* All rights reserved.
|
||||
*
|
||||
* Redistribution and use in source and binary forms, with or without
|
||||
* modification, are permitted provided that the following conditions
|
||||
* are met:
|
||||
* 1. Redistributions of source code must retain the above copyright
|
||||
* notice, this list of conditions and the following disclaimer.
|
||||
* 2. Redistributions in binary form must reproduce the above copyright
|
||||
* notice, this list of conditions and the following disclaimer in the
|
||||
* documentation and/or other materials provided with the distribution.
|
||||
* 3. Neither the name of the Institute nor the names of its contributors
|
||||
* may be used to endorse or promote products derived from this software
|
||||
* without specific prior written permission.
|
||||
*
|
||||
* THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
|
||||
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
||||
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
||||
* ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
|
||||
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
|
||||
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
|
||||
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
|
||||
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
||||
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
|
||||
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
|
||||
* SUCH DAMAGE.
|
||||
*
|
||||
* @(#)$Id: sht11.c,v 1.2 2007/05/28 16:25:29 bg- Exp $
|
||||
*/
|
||||
|
||||
/*
|
||||
* Device driver for the Sensirion SHT1x/SHT7x family of humidity and
|
||||
* temperature sensors.
|
||||
*/
|
||||
|
||||
#include <stdio.h>
|
||||
|
||||
#include <io.h>
|
||||
|
||||
#include <dev/sht11.h>
|
||||
|
||||
/*
|
||||
* SHT11_SDA P1.5
|
||||
* SHT11_SCL P1.6
|
||||
* SHT11_PWR P1.7
|
||||
*/
|
||||
|
||||
#define SDA 5
|
||||
#define SCL 6
|
||||
#define PWR 7
|
||||
|
||||
/* Confusingly similar to I2C but not quite :-( */
|
||||
#define I2C_PxDIR P1DIR
|
||||
#define I2C_PxIN P1IN
|
||||
#define I2C_PxOUT P1OUT
|
||||
#define I2C_PxSEL P1SEL
|
||||
|
||||
#define SDA_0() (I2C_PxDIR |= BV(SDA)) /* SDA Output=0 */
|
||||
#define SDA_1() (I2C_PxDIR &= ~BV(SDA)) /* SDA Input */
|
||||
#define SDA_IS_1 (I2C_PxIN & BV(SDA))
|
||||
|
||||
#define SCL_0() (I2C_PxOUT &= ~BV(SCL)) /* SCL Output=0 */
|
||||
#define SCL_1() (I2C_PxOUT |= BV(SCL)) /* SCL Output=1 */
|
||||
|
||||
/* adr command r/w */
|
||||
#define STATUS_REG_W 0x06 /* 000 0011 0 */
|
||||
#define STATUS_REG_R 0x07 /* 000 0011 1 */
|
||||
#define MEASURE_TEMP 0x03 /* 000 0001 1 */
|
||||
#define MEASURE_HUMI 0x05 /* 000 0010 1 */
|
||||
#define RESET 0x1e /* 000 1111 0 */
|
||||
|
||||
/* This can probably be reduced to 250ns according to data sheet. */
|
||||
#define delay_400ns() _NOP()
|
||||
|
||||
static void
|
||||
sstart(void)
|
||||
{
|
||||
SDA_1(); SCL_0();
|
||||
delay_400ns();
|
||||
SCL_1();
|
||||
delay_400ns();
|
||||
SDA_0();
|
||||
delay_400ns();
|
||||
SCL_0();
|
||||
delay_400ns();
|
||||
SCL_1();
|
||||
delay_400ns();
|
||||
SDA_1();
|
||||
delay_400ns();
|
||||
SCL_0();
|
||||
}
|
||||
|
||||
static void
|
||||
sreset(void)
|
||||
{
|
||||
int i;
|
||||
SDA_1(); SCL_0();
|
||||
for (i = 0; i < 9 ; i++) {
|
||||
SCL_1();
|
||||
delay_400ns();
|
||||
SCL_0();
|
||||
}
|
||||
sstart(); /* Start transmission, why??? */
|
||||
}
|
||||
|
||||
/*
|
||||
* Return true if we received an ACK.
|
||||
*/
|
||||
static int
|
||||
swrite(unsigned _c)
|
||||
{
|
||||
unsigned char c = _c;
|
||||
int i;
|
||||
int ret;
|
||||
|
||||
for (i = 0; i < 8; i++, c <<= 1) {
|
||||
if (c & 0x80)
|
||||
SDA_1();
|
||||
else
|
||||
SDA_0();
|
||||
SCL_1();
|
||||
delay_400ns();
|
||||
SCL_0();
|
||||
}
|
||||
|
||||
SDA_1();
|
||||
SCL_1();
|
||||
delay_400ns();
|
||||
ret = !SDA_IS_1;
|
||||
|
||||
SCL_0();
|
||||
|
||||
return ret;
|
||||
}
|
||||
|
||||
static unsigned
|
||||
sread(int send_ack)
|
||||
{
|
||||
int i;
|
||||
unsigned char c = 0x00;
|
||||
|
||||
SDA_1();
|
||||
for (i = 0; i < 8; i++) {
|
||||
c <<= 1;
|
||||
SCL_1();
|
||||
delay_400ns();
|
||||
if (SDA_IS_1)
|
||||
c |= 0x1;
|
||||
SCL_0();
|
||||
}
|
||||
|
||||
if (send_ack)
|
||||
SDA_0();
|
||||
SCL_1();
|
||||
delay_400ns();
|
||||
SCL_0();
|
||||
|
||||
SDA_1(); /* Release SDA */
|
||||
|
||||
return c;
|
||||
}
|
||||
|
||||
#define CRC_CHECK
|
||||
#ifdef CRC_CHECK
|
||||
static unsigned char
|
||||
rev8bits(unsigned char v)
|
||||
{
|
||||
unsigned char r = v;
|
||||
int s = 7;
|
||||
|
||||
for (v >>= 1; v; v >>= 1) {
|
||||
r <<= 1;
|
||||
r |= v & 1;
|
||||
s--;
|
||||
}
|
||||
r <<= s; /* Shift when v's highest bits are zero */
|
||||
return r;
|
||||
}
|
||||
|
||||
/* BEWARE: Bit reversed CRC8 using polynomial ^8 + ^5 + ^4 + 1 */
|
||||
static unsigned
|
||||
crc8_add(unsigned acc, unsigned byte)
|
||||
{
|
||||
int i;
|
||||
acc ^= byte;
|
||||
for (i = 0; i < 8; i++)
|
||||
if (acc & 0x80)
|
||||
acc = (acc << 1) ^ 0x31;
|
||||
else
|
||||
acc <<= 1;
|
||||
|
||||
return acc & 0xff;
|
||||
}
|
||||
#endif /* CRC_CHECK */
|
||||
|
||||
/*
|
||||
* Power up the device. The device can be used after an additional
|
||||
* 11ms waiting time.
|
||||
*/
|
||||
void
|
||||
sht11_init(void)
|
||||
{
|
||||
/*
|
||||
* SCL Output={0,1}
|
||||
* SDA 0: Output=0
|
||||
* 1: Input and pull-up (Output=0)
|
||||
*/
|
||||
P1OUT |= BV(PWR);
|
||||
P1OUT &= ~(BV(SDA) | BV(SCL));
|
||||
P1DIR |= BV(PWR) | BV(SCL);
|
||||
}
|
||||
|
||||
/*
|
||||
* Power of device.
|
||||
*/
|
||||
void
|
||||
sht11_off(void)
|
||||
{
|
||||
P1OUT &= ~BV(PWR);
|
||||
P1OUT &= ~(BV(SDA) | BV(SCL));
|
||||
P1DIR |= BV(PWR) | BV(SCL);
|
||||
}
|
||||
|
||||
/*
|
||||
* Only commands MEASURE_HUMI or MEASURE_TEMP!
|
||||
*/
|
||||
static unsigned
|
||||
scmd(unsigned cmd)
|
||||
{
|
||||
unsigned long n;
|
||||
|
||||
if (cmd != MEASURE_HUMI && cmd != MEASURE_TEMP)
|
||||
return -1;
|
||||
|
||||
sstart(); /* Start transmission */
|
||||
if (!swrite(cmd))
|
||||
goto fail;
|
||||
|
||||
for (n = 0; n < 250000; n++)
|
||||
if (!SDA_IS_1) {
|
||||
unsigned t0, t1, rcrc;
|
||||
t0 = sread(1);
|
||||
t1 = sread(1);
|
||||
rcrc = sread(0);
|
||||
#ifdef CRC_CHECK
|
||||
{
|
||||
unsigned crc;
|
||||
crc = crc8_add(0x0, cmd);
|
||||
crc = crc8_add(crc, t0);
|
||||
crc = crc8_add(crc, t1);
|
||||
if (crc != rev8bits(rcrc))
|
||||
goto fail;
|
||||
}
|
||||
#endif
|
||||
return (t0 << 8) | t1;
|
||||
}
|
||||
|
||||
fail:
|
||||
sreset();
|
||||
return -1;
|
||||
}
|
||||
|
||||
/*
|
||||
* Call may take up to 210ms.
|
||||
*/
|
||||
unsigned
|
||||
sht11_temp(void)
|
||||
{
|
||||
return scmd(MEASURE_TEMP);
|
||||
}
|
||||
|
||||
/*
|
||||
* Call may take up to 210ms.
|
||||
*/
|
||||
unsigned
|
||||
sht11_humidity(void)
|
||||
{
|
||||
return scmd(MEASURE_HUMI);
|
||||
}
|
||||
|
||||
#if 0 /* But ok! */
|
||||
unsigned
|
||||
sht11_sreg(void)
|
||||
{
|
||||
unsigned sreg, rcrc;
|
||||
|
||||
sstart(); /* Start transmission */
|
||||
if (!swrite(STATUS_REG_R))
|
||||
goto fail;
|
||||
|
||||
sreg = sread(1);
|
||||
rcrc = sread(0);
|
||||
|
||||
#ifdef CRC_CHECK
|
||||
{
|
||||
unsigned crc;
|
||||
crc = crc8_add(0x0, STATUS_REG_R);
|
||||
crc = crc8_add(crc, sreg);
|
||||
if (crc != rev8bits(rcrc))
|
||||
goto fail;
|
||||
}
|
||||
#endif
|
||||
|
||||
return sreg;
|
||||
|
||||
fail:
|
||||
sreset();
|
||||
return -1;
|
||||
}
|
||||
#endif
|
||||
|
||||
#if 0
|
||||
int
|
||||
sht11_set_sreg(unsigned sreg)
|
||||
{
|
||||
sstart(); /* Start transmission */
|
||||
if (!swrite(STATUS_REG_W))
|
||||
goto fail;
|
||||
if (!swrite(sreg))
|
||||
goto fail;
|
||||
|
||||
return 0;
|
||||
|
||||
fail:
|
||||
sreset();
|
||||
return -1;
|
||||
}
|
||||
#endif
|
||||
|
||||
#if 0
|
||||
int
|
||||
sht11_reset(void)
|
||||
{
|
||||
sstart(); /* Start transmission */
|
||||
if (!swrite(RESET))
|
||||
goto fail;
|
||||
|
||||
return 0;
|
||||
|
||||
fail:
|
||||
sreset();
|
||||
return -1;
|
||||
}
|
||||
#endif
|
||||
@ -1,51 +0,0 @@
|
||||
/*
|
||||
* Copyright (c) 2007, Swedish Institute of Computer Science
|
||||
* All rights reserved.
|
||||
*
|
||||
* Redistribution and use in source and binary forms, with or without
|
||||
* modification, are permitted provided that the following conditions
|
||||
* are met:
|
||||
* 1. Redistributions of source code must retain the above copyright
|
||||
* notice, this list of conditions and the following disclaimer.
|
||||
* 2. Redistributions in binary form must reproduce the above copyright
|
||||
* notice, this list of conditions and the following disclaimer in the
|
||||
* documentation and/or other materials provided with the distribution.
|
||||
* 3. Neither the name of the Institute nor the names of its contributors
|
||||
* may be used to endorse or promote products derived from this software
|
||||
* without specific prior written permission.
|
||||
*
|
||||
* THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
|
||||
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
||||
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
||||
* ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
|
||||
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
|
||||
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
|
||||
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
|
||||
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
||||
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
|
||||
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
|
||||
* SUCH DAMAGE.
|
||||
*
|
||||
* @(#)$Id: sht11.h,v 1.2 2007/05/28 16:24:58 bg- Exp $
|
||||
*/
|
||||
|
||||
#ifndef SHT11_H
|
||||
#define SHT11_H
|
||||
|
||||
void sht11_init(void);
|
||||
void sht11_off(void);
|
||||
|
||||
unsigned sht11_temp(void);
|
||||
unsigned sht11_humidity(void);
|
||||
unsigned sht11_sreg(void);
|
||||
int sht11_set_sreg(unsigned);
|
||||
|
||||
/*
|
||||
* Relative Humidity in percent (h in 12 bits resolution)
|
||||
* RH = -4 + 0.0405*h - 2.8e-6*(h*h)
|
||||
*
|
||||
* Temperature in Celsius (t in 14 bits resolution at 3 Volts)
|
||||
* T = -39.60 + 0.01*t
|
||||
*/
|
||||
|
||||
#endif /* SHT11_H */
|
||||
Loading…
Reference in New Issue
Block a user