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added debug to sht11 driver and made it more configurable

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This commit is contained in:
Joakim Eriksson 2011-06-05 00:15:53 +02:00
parent 77ec0bfa0f
commit e511c6a930
1 changed files with 29 additions and 1 deletions
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30
core/dev/sht11.c
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@ -47,13 +47,23 @@
#include <dev/sht11.h>
#include "sht11-arch.h"
#define DEBUG 0
#if DEBUG
#include <stdio.h>
#define PRINTF(...) printf(__VA_ARGS__)
#else
#define PRINTF(...)
#endif
#ifndef SDA_0()
#define SDA_0() (SHT11_PxDIR |= BV(SHT11_ARCH_SDA)) /* SDA Output=0 */
#define SDA_1() (SHT11_PxDIR &= ~BV(SHT11_ARCH_SDA)) /* SDA Input */
#define SDA_IS_1 (SHT11_PxIN & BV(SHT11_ARCH_SDA))
#define SCL_0() (SHT11_PxOUT &= ~BV(SHT11_ARCH_SCL)) /* SCL Output=0 */
#define SCL_1() (SHT11_PxOUT |= BV(SHT11_ARCH_SCL)) /* SCL Output=1 */
#endif
/* adr command r/w */
#define STATUS_REG_W 0x06 /* 000 0011 0 */
#define STATUS_REG_R 0x07 /* 000 0011 1 */
@ -62,7 +72,9 @@
#define RESET 0x1e /* 000 1111 0 */
/* This can probably be reduced to 250ns according to data sheet. */
#ifndef delay_400ns()
#define delay_400ns() _NOP()
#endif
/*---------------------------------------------------------------------------*/
static void
sstart(void)
@ -92,6 +104,7 @@ sreset(void)
SCL_1();
delay_400ns();
SCL_0();
delay_400ns();
}
sstart(); /* Start transmission, why??? */
}
@ -115,6 +128,7 @@ swrite(unsigned _c)
SCL_1();
delay_400ns();
SCL_0();
delay_400ns();
}
SDA_1();
@ -142,6 +156,7 @@ sread(int send_ack)
c |= 0x1;
}
SCL_0();
delay_400ns();
}
if(send_ack) {
@ -202,9 +217,13 @@ sht11_init(void)
* SDA 0: Output=0
* 1: Input and pull-up (Output=0)
*/
#ifdef SHT11_INIT()
SHT11_INIT();
#else
SHT11_PxOUT |= BV(SHT11_ARCH_PWR);
SHT11_PxOUT &= ~(BV(SHT11_ARCH_SDA) | BV(SHT11_ARCH_SCL));
SHT11_PxDIR |= BV(SHT11_ARCH_PWR) | BV(SHT11_ARCH_SCL);
#endif
}
/*---------------------------------------------------------------------------*/
/*
@ -213,9 +232,13 @@ sht11_init(void)
void
sht11_off(void)
{
#ifdef SHT11_OFF()
SHT11_OFF();
#else
SHT11_PxOUT &= ~BV(SHT11_ARCH_PWR);
SHT11_PxOUT &= ~(BV(SHT11_ARCH_SDA) | BV(SHT11_ARCH_SCL));
SHT11_PxDIR |= BV(SHT11_ARCH_PWR) | BV(SHT11_ARCH_SCL);
#endif
}
/*---------------------------------------------------------------------------*/
/*
@ -227,11 +250,13 @@ scmd(unsigned cmd)
unsigned long n;
if(cmd != MEASURE_HUMI && cmd != MEASURE_TEMP) {
PRINTF("Illegal command: %d\n", cmd);
return -1;
}
sstart(); /* Start transmission */
if(!swrite(cmd)) {
PRINTF("SHT11: scmd - swrite failed\n");
goto fail;
}
@ -241,6 +266,7 @@ scmd(unsigned cmd)
t0 = sread(1);
t1 = sread(1);
rcrc = sread(0);
PRINTF("SHT11: scmd - read %d, %d\n", t0, t1);
#ifdef CRC_CHECK
{
unsigned crc;
@ -248,6 +274,8 @@ scmd(unsigned cmd)
crc = crc8_add(crc, t0);
crc = crc8_add(crc, t1);
if(crc != rev8bits(rcrc)) {
PRINTF("SHT11: scmd - crc check failed %d vs %d\n",
crc, rev8bits(rcrc));
goto fail;
}
}