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* Add sht11_off.

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This commit is contained in:
bg- 2007-05-28 16:24:58 +00:00
parent 78eb449dc5
commit ceb423c007
2 changed files with 37 additions and 5 deletions
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29
platform/sky/dev/sht11.c
View file

@ -26,7 +26,7 @@
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE. * SUCH DAMAGE.
* *
* @(#)$Id: sht11.c,v 1.1 2007/04/04 12:48:50 bg- Exp $ * @(#)$Id: sht11.c,v 1.2 2007/05/28 16:25:29 bg- Exp $
*/ */
/* /*
@ -194,6 +194,10 @@ crc8_add(unsigned acc, unsigned byte)
} }
#endif /* CRC_CHECK */ #endif /* CRC_CHECK */
/*
* Power up the device. The device can be used after an additional
* 11ms waiting time.
*/
void void
sht11_init(void) sht11_init(void)
{ {
@ -207,6 +211,17 @@ sht11_init(void)
P1DIR |= BV(PWR) | 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! * Only commands MEASURE_HUMI or MEASURE_TEMP!
*/ */
@ -246,12 +261,18 @@ scmd(unsigned cmd)
return -1; return -1;
} }
/*
* Call may take up to 210ms.
*/
unsigned unsigned
sht11_temp(void) sht11_temp(void)
{ {
return scmd(MEASURE_TEMP); return scmd(MEASURE_TEMP);
} }
/*
* Call may take up to 210ms.
*/
unsigned unsigned
sht11_humidity(void) sht11_humidity(void)
{ {
@ -260,7 +281,7 @@ sht11_humidity(void)
#if 0 /* But ok! */ #if 0 /* But ok! */
unsigned unsigned
sget_sreg(void) sht11_sreg(void)
{ {
unsigned sreg, rcrc; unsigned sreg, rcrc;
@ -290,8 +311,8 @@ sget_sreg(void)
#endif #endif
#if 0 #if 0
unsigned int
sset_sreg(unsigned sreg) sht11_set_sreg(unsigned sreg)
{ {
sstart(); /* Start transmission */ sstart(); /* Start transmission */
if (!swrite(STATUS_REG_W)) if (!swrite(STATUS_REG_W))

13
platform/sky/dev/sht11.h
View file

@ -26,15 +26,26 @@
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE. * SUCH DAMAGE.
* *
* @(#)$Id: sht11.h,v 1.1 2007/04/04 12:48:50 bg- Exp $ * @(#)$Id: sht11.h,v 1.2 2007/05/28 16:24:58 bg- Exp $
*/ */
#ifndef SHT11_H #ifndef SHT11_H
#define SHT11_H #define SHT11_H
void sht11_init(void); void sht11_init(void);
void sht11_off(void);
unsigned sht11_temp(void); unsigned sht11_temp(void);
unsigned sht11_humidity(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 */ #endif /* SHT11_H */