Revision 0:486c7ab9114b, committed 2017-06-05

Comitter:

Roietronics

Date:

Mon Jun 05 21:11:32 2017 +0000

Commit message:

Initial commit of one wire example for MBED 2

Changed in this revision

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/DS18X20.h	Mon Jun 05 21:11:32 2017 +0000
@@ -0,0 +1,60 @@
+/* DS18X20 specific values (see datasheet www.maxim-ic.com/datasheet/index.mvp/id/2812) */
+#ifndef _DS18X20_
+#define _DS18X20_
+#define DS18S20_ID 0x10
+#define DS18B20_ID 0x28
+
+#define DS18X20_POWER_PARASITE 0x00
+#define DS18X20_POWER_EXTERN   0x01
+#define DS18X20_CONVERT_T    0x44
+#define DS18X20_READ        0xBE
+#define DS18X20_WRITE        0x4E
+#define DS18X20_EE_WRITE    0x48
+#define DS18X20_EE_RECALL    0xB8
+#define DS18X20_READ_POWER_SUPPLY 0xB4
+
+#define DS18X20_OK          0x00
+#define DS18X20_ERROR       0x01
+#define DS18X20_START_FAIL  0x02
+#define DS18X20_ERROR_CRC   0x03
+
+#define DS18B20_CONF_REG    4
+#define DS18B20_9_BIT       0
+#define DS18B20_10_BIT      (1<<5)
+#define DS18B20_11_BIT      (1<<6)
+#define DS18B20_12_BIT      ((1<<6)|(1<<5))
+
+// indefined bits in LSB if 18B20 != 12bit
+#define DS18B20_9_BIT_UNDF       ((1<<0)|(1<<1)|(1<<2))
+#define DS18B20_10_BIT_UNDF      ((1<<0)|(1<<1))
+#define DS18B20_11_BIT_UNDF      ((1<<0))
+#define DS18B20_12_BIT_UNDF      0
+
+// conversion times in ms
+#define DS18B20_TCONV_12BIT      750
+#define DS18B20_TCONV_11BIT      DS18B20_TCONV_12_BIT/2
+#define DS18B20_TCONV_10BIT      DS18B20_TCONV_12_BIT/4
+#define DS18B20_TCONV_9BIT       DS18B20_TCONV_12_BIT/8
+#define DS18S20_TCONV            DS18B20_TCONV_12_BIT
+
+// constant to convert the fraction bits to cel*(10^-4)
+#define DS18X20_FRACCONV         625
+
+#define DS18X20_SP_SIZE  9
+
+// DS18X20 EEPROM-Support
+#define DS18X20_WRITE_SCRATCHPAD  0x4E
+#define DS18X20_COPY_SCRATCHPAD   0x48
+#define DS18X20_RECALL_E2         0xB8
+#define DS18X20_COPYSP_DELAY      10 /* ms */
+#define DS18X20_TH_REG      2
+#define DS18X20_TL_REG      3
+                          
+uint8_t DS18X20_get_power_status(uint8_t id[]); 
+uint8_t DS18X20_start_meas( uint8_t with_external, uint8_t id[]);
+uint8_t DS18X20_read_meas(uint8_t id[], uint8_t *subzero, uint8_t *cel, uint8_t *cel_frac_bits);
+uint8_t DS18X20_read_meas_single(uint8_t familycode, uint8_t *subzero, uint8_t *cel, uint8_t *cel_frac_bits);
+uint8_t DS18X20_meas_to_cel( uint8_t fc, uint8_t *sp, uint8_t* subzero, uint8_t* cel, uint8_t* cel_frac_bits);
+uint16_t DS18X20_temp_to_decicel(uint8_t subzero, uint8_t cel, uint8_t cel_frac_bits);
+int8_t DS18X20_temp_cmp(uint8_t subzero1, uint16_t cel1, uint8_t subzero2, uint16_t cel2);
+#endif
\ No newline at end of file

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/DS2450.h	Mon Jun 05 21:11:32 2017 +0000
@@ -0,0 +1,41 @@
+/* DS2450 specific values (see datasheet www.maxim-ic.com/datasheet/index.mvp/id/2921) */
+#ifndef _DS2450_
+#define _DS2450_
+#define DS2450_ID           0x20
+#define DS2450_READ_MEMORY  0xAA
+#define DS2450_WRITE_MEMORY 0x55
+#define DS2450_CONVERT      0x3C
+
+#define DS2450_SP_SIZE 13
+#define DS2450_PAGE0 0x00
+#define DS2450_PAGE1 0x08
+#define DS2450_PAGE2 0x10
+#define DS2450_PAGE3 0x18
+
+#define DS2450_ADCA 0x00 //channel A
+#define DS2450_ADCB 0x02 //channel B
+#define DS2450_ADCC 0x04 //channel C
+#define DS2450_ADCD 0x06 //channel D
+
+#define DS2450_IR_2V5          0x00 //input voltage range 2.55V
+#define DS2450_IR_5V1          0x01 //input voltage range 5.1V
+#define DS2450_AFH              0x20 //flag alarm value higher
+#define DS2450_AFL              0x10 //flag alarm value lower
+#define DS2450_AEH_ENABLE       0x08 //alarm value higher enable  
+#define DS2450_AEL_ENABLE       0x04 //alarm value lower enable
+
+#define DS2450_DISABLE_OUT  0x00 //disable ouput
+#define DS2450_ENABLE_OUT   0x80//enable ouput
+
+#define DS2450_16_BIT       0x00 //ADC 16bits enable ouput
+#define DS2450_15_BIT       0x0F //ADC 15bits enable ouput
+#define DS2450_12_BIT       0x0C //ADC 12bits enable ouput
+#define DS2450_8_BIT        0x08   //ADC 8bits enable ouput
+#define DS2450_1_BIT        0x01   //ADC 1bits enable ouput
+uint8_t DS2450_read_page(uint8_t id[], uint8_t adresse, uint8_t *val);
+uint8_t DS2450_convert(uint8_t id[], uint8_t input_select_mask,uint8_t read_out_control);
+uint8_t DS2450_read_ADC(uint8_t id[], uint16_t adc[]);
+uint8_t DS2450_start_and_read_ADC(uint8_t id[], uint16_t adc[]);
+uint8_t DS2450_configure_channel_ADC(uint8_t id[],uint8_t channel,uint8_t conflsb,uint8_t confmsb);
+uint8_t DS2450_configure_page(uint8_t id[], uint8_t adresse,uint8_t configpage[]);
+#endif
\ No newline at end of file

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/crc8.cpp	Mon Jun 05 21:11:32 2017 +0000
@@ -0,0 +1,39 @@
+#include <inttypes.h>
+
+#define CRC8INIT    0x00
+#define CRC8POLY    0x18              //0X18 = X^8+X^5+X^4+X^0
+
+uint8_t    crc8 ( uint8_t *data_in, uint16_t number_of_bytes_to_read )
+{
+    uint8_t     crc;
+    uint16_t loop_count;
+    uint8_t  bit_counter;
+    uint8_t  data;
+    uint8_t  feedback_bit;
+    
+    crc = CRC8INIT;
+
+    for (loop_count = 0; loop_count != number_of_bytes_to_read; loop_count++)
+    {
+        data = data_in[loop_count];
+        
+        bit_counter = 8;
+        do {
+            feedback_bit = (crc ^ data) & 0x01;
+    
+            if ( feedback_bit == 0x01 ) {
+                crc = crc ^ CRC8POLY;
+            }
+            crc = (crc >> 1) & 0x7F;
+            if ( feedback_bit == 0x01 ) {
+                crc = crc | 0x80;
+            }
+        
+            data = data >> 1;
+            bit_counter--;
+        
+        } while (bit_counter > 0);
+    }
+    
+    return crc;
+}

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/crc8.h	Mon Jun 05 21:11:32 2017 +0000
@@ -0,0 +1,4 @@
+#ifndef _CRC8_
+#define _CRC8_
+uint8_t    crc8 (uint8_t* data_in, uint16_t number_of_bytes_to_read);
+#endif
\ No newline at end of file

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/main.cpp	Mon Jun 05 21:11:32 2017 +0000
@@ -0,0 +1,237 @@
+/*****************************************************************************
+ *                                                                           *
+ * BOSCH RainGauge LoraWan Interface                                         *
+ *                                                                           *
+ * (c) 2016 Global Quality Corp                                              *
+ * mailto:sudhir@gqc.com                                                     *
+ * Global Quality Corp                                                       *
+ *                                                                           *
+ * Pal Alto, CA. 94040 USA                                                   *
+ *                                                                           *
+ * PERMISSION GRANTED TO USE IN NON-COMMERCIAL AND EDUCATIONAL PROJECTS      *
+ * NO RESPONSIBILITY ASSUMED FOR DAMAGE OR LOSS OF ANY HARDWARE OR SOFTWARE  *
+ *                                                                           *
+ * version 0.2                                                               *
+ * last change 7, Dec 2016                                              *
+ *                                                                           *
+ ****************************************************************************/
+#include "mbed.h"
+#include "onewire.h"
+#include "DS18X20.h"
+#include "DS2450.h"
+
+uint8_t gSensorIDs[MAXSENSORS][OW_ROMCODE_SIZE];
+uint8_t nSensors;
+uint32_t nErreur;
+uint32_t nErreur_DS18X20;
+uint32_t nErreur_DS2450;
+uint32_t nErreur_CRC;
+uint32_t nErreur_BUS;
+uint32_t nErreur_DS2450_START;
+uint32_t nErreur_BUSY;
+uint32_t nErreur_RESET;
+uint32_t nMesure;
+uint32_t micro_seconds;
+Serial pc(USBTX, USBRX); // tx, rx
+BusOut bugleds(LED1, LED2, LED3, LED4);
+
+/**
+*     @brief DS18X20_show_temp
+*    @param  [in] id[] = rom_code
+*    @param  [in] n number of id[n]
+*    @param  [out] text temp in degre celsius
+
+*     @date 20/06/2011
+*/
+/*
+void DS18X20_show_temp(uint8_t subzero, uint8_t cel, uint8_t cel_frac_bits,char *text) {
+    uint16_t decicelsius;
+    char s[10];
+    float temperature;
+    sprintf(text,"");
+    sprintf(s,"%s", (subzero)?"-":"+");
+    strcat(text,s);
+    decicelsius = DS18X20_temp_to_decicel(subzero, cel, cel_frac_bits);
+    temperature = decicelsius;
+    temperature = temperature/10;
+    sprintf(s,"%4.1f", temperature);
+    strcat(text,s);
+
+}
+*/
+
+int main(void) {
+    uint8_t sp[25];
+    uint8_t num_sensor;
+    uint8_t subzero, cel, cel_frac_bits;
+    Timer timer;
+
+    pc.printf("version 2017-06-2\n");
+    pc.printf("Qantum 1 wire interface test!\n");
+
+
+
+     ow_PullUp();
+    if (search_sensors(&nSensors,&gSensorIDs[0][0])) {
+        pc.printf("no Sensors found\n");
+        return -1;
+    } else {
+        pc.printf("Sensors found : %d\n", nSensors);
+
+        for (num_sensor=0; num_sensor<nSensors; ++num_sensor) {
+            char text_id[25];
+            ow_show_id( &gSensorIDs[num_sensor][0], OW_ROMCODE_SIZE,text_id );
+            pc.printf("%s Sensor # %d is a ",text_id, num_sensor+1);
+            //DS18X20
+            if (( gSensorIDs[num_sensor][0] == DS18S20_ID) || ( gSensorIDs[num_sensor][0] == DS18B20_ID)) {
+                if ( gSensorIDs[num_sensor][0] == DS18S20_ID)
+                    pc.printf("DS18S20/DS1820 ");
+                if ( gSensorIDs[num_sensor][0] == DS18B20_ID)
+                    pc.printf("DS18B20 ");
+/*                    
+                if ( DS18X20_get_power_status( &gSensorIDs[num_sensor][0] ) ==
+                        DS18X20_POWER_PARASITE )
+                    pc.printf( "parasite" );
+                else pc.printf( "externally" );
+                pc.printf( " powered\n" );
+8/
+            }
+            //DS2450
+ /*
+            if ( gSensorIDs[num_sensor][0] == DS2450_ID) {
+                pc.printf("DS2450 ");
+                for (uint8_t i=0 ; i< DS2450_SP_SIZE; i++ )     // DS2450 POWER extern
+                    sp[i]=0;
+                sp[4]=0x40;
+                if (DS2450_configure_page(&gSensorIDs[num_sensor][0], DS2450_PAGE3,&sp[0]))
+                    pc.printf("CRC Error conf page \n");
+                if (DS2450_read_page(&gSensorIDs[num_sensor][0], DS2450_PAGE3,&sp[0]))
+                    ;
+                else
+                    printf( "\n" );
+                for ( char i=0 ; i< DS2450_SP_SIZE; i++ )
+                    printf(":%2.2X",sp[i]);
+                printf( "\n" );
+                if (DS2450_configure_channel_ADC(&gSensorIDs[num_sensor][0],DS2450_ADCA,DS2450_12_BIT ,DS2450_IR_5V1))
+                    pc.printf("CRC Error conf ADC\n");
+                if (DS2450_configure_channel_ADC(&gSensorIDs[num_sensor][0],DS2450_ADCB,DS2450_1_BIT ,DS2450_IR_5V1))
+                    pc.printf("CRC Error conf ADC\n");
+                if (DS2450_configure_channel_ADC(&gSensorIDs[num_sensor][0],DS2450_ADCC,DS2450_1_BIT,DS2450_IR_5V1))
+                    pc.printf("CRC Error conf ADC\n");
+                if (DS2450_configure_channel_ADC(&gSensorIDs[num_sensor][0],DS2450_ADCD,DS2450_1_BIT,DS2450_IR_5V1))
+                    pc.printf("CRC Error conf ADC\n");
+                uint16_t adc[4];
+                if (DS2450_start_and_read_ADC(&gSensorIDs[num_sensor][0], &adc[0]))
+                    pc.printf("CRC Error read ADC\n");
+                for (uint8_t i=0; i<4; ++i )
+                    pc.printf(" adc%d:%X %f |",i,adc[i],adc[i]*5.1/65535);
+                pc.printf("\n");
+            }
+*/
+        }
+        nErreur=0;
+        nErreur_CRC=0;
+        nErreur_BUS=0;
+        nErreur_DS18X20=0;
+        nErreur_DS2450=0;
+        nErreur_DS2450_START=0;
+        nErreur_BUSY=0;
+        nErreur_RESET=0;
+        nMesure=0;
+        timer.start();
+/*
+        while (1) {
+            wait(1);            // temps attente
+            nMesure++;
+            pc.printf("Mesure:%d erreur%d\n",nMesure,nErreur);
+            bugleds=nErreur;
+            switch (DS18X20_start_meas(DS18X20_POWER_EXTERN, 0 )) { // start measure ALL DS18X20
+                case DS18X20_OK :
+                    wait_ms(DS18B20_TCONV_12BIT);
+                    break;
+                case DS18X20_START_FAIL:
+                    nErreur++;
+                    nErreur_DS18X20++;
+                    pc.printf("sensor DS18X20 : Start meas. failed \n");
+                    break;
+            }
+
+            for (num_sensor=0; num_sensor<nSensors; ++num_sensor) {
+                //DS2450
+                if (gSensorIDs[num_sensor][0] == DS2450_ID) {
+                    micro_seconds=timer.read_us();
+                    uint16_t adc[4];
+                    if (DS2450_start_and_read_ADC(&gSensorIDs[num_sensor][0], &adc[0])) // 3 essais avant erreur
+                        if (DS2450_start_and_read_ADC(&gSensorIDs[num_sensor][0], &adc[0]))
+                            switch (DS2450_start_and_read_ADC(&gSensorIDs[num_sensor][0], &adc[0])) {
+                                case OW_OK:
+
+                                    break;
+                                case OW_BUSY:
+                                    nErreur++;
+                                    nErreur_DS2450++;
+                                    nErreur_BUSY++;
+
+                                    break;
+                                case OW_ERROR:
+                                    nErreur++;
+                                    nErreur_DS2450++;
+                                    nErreur_BUS++;
+
+                                    break;
+                                case OW_ERROR_CRC:
+                                    nErreur++;
+                                    nErreur_DS2450++;
+                                    nErreur_CRC++;
+                                    pc.printf("Error:%d\n",nErreur);
+                                    pc.printf("ErrorDS2450_busy:%d\n",nErreur_BUSY);
+                                    pc.printf("ErrorDS2450_start:%d\n",nErreur_DS2450_START);
+                                    pc.printf("ErrorDS2450:%d\n",nErreur_DS2450);
+                                    pc.printf("ErrorDS18X20:%d\n",nErreur_DS18X20);
+                                    pc.printf("ErrorCRC:%d\n",nErreur_CRC);
+                                    pc.printf("ErrorBUS:%d\n",nErreur_BUS);
+                                    pc.printf("ErrorRESET:%d\n",nErreur_RESET);
+                                    pc.printf("Mesure:%d\n",nMesure);
+                                    break;
+                                case OW_SHORT_CIRCUIT:
+                                    nErreur++;
+                                    nErreur_DS2450++;
+                                    nErreur_RESET++;
+                                    break;
+                                case OW_ERROR_BAD_ID:
+
+                                    break;
+                            }
+                    micro_seconds = timer.read_us()- micro_seconds; // duree lecture DS2450
+                    pc.printf("sensor %d : time:%umicros\n",num_sensor+1,micro_seconds);
+                    for (uint8_t i=0; i<4; ++i )
+                        pc.printf(" adc%d:%X %f |",i,adc[i],adc[i]*5.1/65535);
+                    pc.printf("\n");
+                }
+
+                //TEMP DS1820
+                if ( (gSensorIDs[num_sensor][0] == DS18S20_ID) ||( gSensorIDs[num_sensor][0] == DS18B20_ID))
+                    switch (DS18X20_read_meas( &gSensorIDs[num_sensor][0], &subzero, &cel, &cel_frac_bits)) {
+                        case DS18X20_OK :
+                            char text[25];
+                            DS18X20_show_temp(subzero, cel, cel_frac_bits,text);
+                            pc.printf("sensor %d : %s\n",num_sensor+1,text);
+                            break;
+                        case OW_ERROR:
+                            nErreur++;
+                            nErreur_BUS++;
+                            nErreur_DS18X20++;
+                            pc.printf("sensor %d : BUS Error\n",num_sensor+1);
+                            break;
+                        case DS18X20_ERROR_CRC:
+                            nErreur++;
+                            nErreur_DS18X20++;
+                            nErreur_CRC++;
+                            pc.printf("sensor %d : CRC Error\n",num_sensor+1);
+                            break;
+                    }
+            }
+*/
+        }
+    }
+}

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/main.h	Mon Jun 05 21:11:32 2017 +0000
@@ -0,0 +1,19 @@
+/*****************************************************************************
+ *                                                                           *
+ * Dallas Semiconductorn (Maximum) One Wire Device Enumerator                *
+ *                                                                           *
+ * (c) 2016 Global Quality Corp                                              *
+ * mailto:sudhir@gqc.com                                                     *
+ * Global Quality Corp                                                       *
+ *                                                                           *
+ * Pal Alto, CA. 94040 USA                                                   *
+ *                                                                           *
+ * PERMISSION GRANTED TO USE IN NON-COMMERCIAL AND EDUCATIONAL PROJECTS      *
+ * NO RESPONSIBILITY ASSUMED FOR DAMAGE OR LOSS OF ANY HARDWARE OR SOFTWARE  *
+ *                                                                           *
+ * version 0.1                                                               *
+ * last change 2, June 2017                                                  *
+ *                                                                           *
+ ****************************************************************************/
+
+

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/mbed.bld	Mon Jun 05 21:11:32 2017 +0000
@@ -0,0 +1,1 @@
+https://mbed.org/users/mbed_official/code/mbed/builds/86740a56073b
\ No newline at end of file

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/onewire.cpp	Mon Jun 05 21:11:32 2017 +0000
@@ -0,0 +1,318 @@
+/**
+* @file onewire.c
+* @brief library 1-Wire(www.maxim-ic.com)
+* @author Maciej Rajtar (Published 10 May 2010 www.mbed.org)
+* @author Frederic BLANC
+*/
+#include "mbed.h"
+#include "onewire.h"
+#include "DS2450.h"
+#include "DS18X20.h"
+#include "crc8.h"
+
+DigitalInOut ow_pin(ONEWIRE_PIN);
+
+/**
+*     @brief PUL-UP bus OW
+*    @return OW_OK
+*     @date 20/06/2011
+*/
+uint8_t ow_PullUp(void)
+{
+    ow_pin.mode(PullUp); //PULL-UP bus OW
+return OW_OK;
+}
+/**
+*     @brief search_sensors
+*    @param  [out] nSensors number of device onewire
+*    @param  [out] gSensorIDs[][] array of id romcode
+*    @return OW_OK or OW_PRESENCE_ERR or OW_DATA_ERR
+*     @date 20/06/2011
+*/
+uint8_t search_sensors(uint8_t *nSensors,uint8_t *gSensorIDs ) {
+    uint8_t i;
+    uint8_t id[OW_ROMCODE_SIZE];
+    uint8_t diff;
+    printf( "Scanning Bus\n" );
+    diff = OW_SEARCH_FIRST;
+    for (*nSensors = 0 ; (diff != OW_LAST_DEVICE) && (*nSensors < MAXSENSORS) ;++(*nSensors) ) {
+        ow_find_sensor( &diff, &id[0] );
+        if ( diff == OW_PRESENCE_ERR ) {
+            printf( "No Sensor found\n" );
+            return diff;
+        }
+        if ( diff == OW_DATA_ERR ) {
+            printf( "Bus Error\n" );
+            return diff;
+        }
+        for (i=0;i<OW_ROMCODE_SIZE;i++)
+            gSensorIDs[(*nSensors)*OW_ROMCODE_SIZE+i]=id[i];
+
+    }
+    return OW_OK;
+}
+/**
+*     @brief show_id
+*    @param  [in] id[] = rom_code
+*    @param  [in] n number of id[n]
+*    @param  [out] text id
+*    @return OW_OK or OW_ERROR_CRC
+*     @date 20/06/2011
+*/
+uint8_t ow_show_id( uint8_t id[], size_t n ,char *text) {
+    size_t i;
+    char hex[4];
+    sprintf(text,"");
+    
+    for ( i = 0; i < n; i++ ) {
+        if ( i == 0 ) strcat(text, " FC: " );
+        else if ( i == n-1 ) strcat(text, "CRC: " );
+        if ( i == 1 ) strcat(text, " SN: " );
+        sprintf(hex,"%2.2X ",id[i]);
+        strcat(text,hex);
+        if ( i == 0 ) {
+            if ( id[0] == DS18S20_ID ) strcat(text,"(18S)");
+            else if ( id[0] == DS18B20_ID ) strcat(text,"(18B)");
+            else if ( id[0] == DS2450_ID ) strcat(text,"(ADC)");
+            else strcat(text,"( ? )");
+        }
+    }
+    if ( crc8( id, OW_ROMCODE_SIZE) )
+        return OW_ERROR_CRC;
+    return OW_OK;
+}
+
+/**
+*     @brief test pin onewire bus
+*    @return etat pin ow
+*     @date 20/06/2011
+*/
+uint8_t ow_test_pin (void){
+    if (ow_pin)
+        return 1;
+return 0;   
+}
+/**
+*     @brief onewire reset bus
+*    @return pin ow or OW_SHORT_CIRCUIT
+*     @date 20/06/2011
+*/
+uint8_t ow_reset(void) { // reset.  Should improve to act as a presence pulse
+    uint8_t err;
+
+    ow_pin.output();
+    ow_pin = 0;     // bring low for 500 us
+    wait_us(500);
+    ow_pin.input();
+    wait_us(60);
+    err = ow_pin;
+    wait_us(240);
+    if ( ow_pin == 0 )    {    // short circuit
+        err = OW_SHORT_CIRCUIT;
+    }
+    return err;
+}
+
+/**
+*     @brief read write onewire
+*    @param  [in/out] b data
+*    @return data
+*     @date 20/06/2011
+*/
+uint8_t ow_bit_io( uint8_t b ) {
+
+    ow_pin.output(); // drive bus low
+    ow_pin = 0;
+    wait_us(1); // Recovery-Time wuffwuff was 1
+    
+    if ( b ) 
+        ow_pin.input(); // if bit is 1 set bus high (by ext. pull-up)
+    //  delay was 15uS-1 see comment above
+    wait_us(15-1);
+    if ( ow_pin == 0 ) b = 0; // sample at end of read-timeslot
+    wait_us(60-15);
+    ow_pin.input();
+    return b;
+}
+
+/**
+*     @brief byte write on onewire
+*    @param  [in] b data
+*    @return data
+*     @date 20/06/2011
+*/
+uint8_t ow_byte_wr( uint8_t b ) {
+    uint8_t i = 8, j;
+
+    do {
+        j = ow_bit_io( b & 1 );
+        b >>= 1;
+        if ( j )
+            b |= 0x80;
+    } while ( --i );
+    return b;
+}
+
+/**
+*     @brief byte read on onewire
+*    @param  [in] uint8_t b
+*    @return 
+*     @date 20/06/2011
+*/
+uint8_t ow_byte_rd( void ) {
+    // read by sending 0xff (a dontcare?)
+    return ow_byte_wr( 0xFF );
+}
+
+
+/**
+*     @brief search romcode
+*    @param  [in] uint8_t diff
+*    @param  [out] id romcode
+*    @return next_diff or OW_LAST_DEVICE or OW_DATA_ERR or OW_PRESENCE_ERR
+*     @date 20/06/2011
+*/
+uint8_t ow_rom_search( uint8_t diff, uint8_t id[] ) {
+    uint8_t i, j, next_diff;
+    uint8_t b;
+
+    if ( ow_reset() )
+        return OW_PRESENCE_ERR;    // error, no device found
+    ow_byte_wr( OW_SEARCH_ROM );            // ROM search command
+    next_diff = OW_LAST_DEVICE;            // unchanged on last device
+    i = OW_ROMCODE_SIZE * 8;                    // 8 bytes
+    do {
+        j = 8;                                // 8 bits
+        do {
+            b = ow_bit_io( 1 );                // read bit
+            if ( ow_bit_io( 1 ) ) {            // read complement bit
+                if ( b )                    // 11
+                    return OW_DATA_ERR;        // data error
+            } else {
+                if ( !b ) {                    // 00 = 2 devices
+                    if ( diff > i || ((*id & 1) && diff != i) ) {
+                        b = 1;                // now 1
+                        next_diff = i;        // next pass 0
+                    }
+                }
+            }
+            ow_bit_io( b );                 // write bit
+            *id >>= 1;
+            if ( b ) 
+                *id |= 0x80;            // store bit
+            --i;
+        } while ( --j );    
+        id++;                                // next byte
+    } while ( i );
+    return next_diff;                // to continue search
+}
+
+/**
+*     @brief write command
+*    @param  [in] command
+*    @param  [in] id romcode
+*     @date 20/06/2011
+*/
+uint8_t ow_command( uint8_t command, uint8_t id[] ) {
+    uint8_t i;
+
+    ow_reset();
+    if ( id ) {
+        ow_byte_wr( OW_MATCH_ROM );            // to a single device
+        i = OW_ROMCODE_SIZE;
+        do {
+            ow_byte_wr( *id );
+            ++id;
+        } while ( --i );
+    } else {
+        ow_byte_wr( OW_SKIP_ROM );            // to all devices
+    }
+    ow_byte_wr( command );
+    return 0;
+}
+/**
+*     @brief parasite enable
+*     @date 20/06/2011
+*/
+uint8_t ow_parasite_enable(void) {
+    ow_pin.output();
+    ow_pin = 1;
+    return 0;
+}
+/**
+*     @brief parasite disable
+*     @date 20/06/2011
+*/
+uint8_t ow_parasite_disable(void) {
+
+    ow_pin.input();
+    return 0;
+}
+
+
+/**
+*     @brief find Sensors on 1-Wire-Bus
+*    @param  [in/out] diff is the result of the last rom-search
+*    @param  [out] is the rom-code of the sensor found
+*    @return  OW_OK or OW_ERROR 
+*/
+uint8_t ow_find_sensor(uint8_t *diff, uint8_t id[]) {
+    for (;;) 
+    {
+        *diff = ow_rom_search( *diff, &id[0] );
+        if ( *diff==OW_PRESENCE_ERR)
+            return OW_ERROR;
+        if ( *diff==OW_DATA_ERR )
+            return OW_ERROR;
+        if ( *diff == OW_LAST_DEVICE )
+            return OW_OK ;
+        if ( id[0] == DS18B20_ID || id[0] == DS18S20_ID ) 
+            return OW_OK ;
+        if ( id[0] == DS2450_ID ) 
+            return OW_OK ;
+    }
+}
+
+/**
+*     @brief output byte d (least sig bit first)
+*    @param  [in] d output byte (least sig bit first)
+*    @return  OW_OK 
+*/
+uint8_t OneWireOutByte(uint8_t d) { // output byte d (least sig bit first).
+    for (int n=8; n!=0; n--) {
+        if ((d & 0x01) == 1) { // test least sig bit
+            ow_pin.output();
+            ow_pin = 0;
+            wait_us(5);
+            ow_pin.input();
+            wait_us(80);
+        } else {
+            ow_pin.output();
+            ow_pin = 0;
+            wait_us(80);
+            ow_pin.input();
+        }
+        d=d>>1; // now the next bit is in the least sig bit position.
+    }
+    return OW_OK;
+}
+/**
+*     @brief read byte, least sig byte first
+*    @return  byte, least sig byte first 
+*/
+uint8_t OneWireInByte(void) { // read byte, least sig byte first
+    uint8_t d = 0, b;
+    for (int n=0; n<8; n++) {
+        ow_pin.output();
+        ow_pin = 0;
+        wait_us(5);
+        ow_pin.input();
+        wait_us(5);
+        b =ow_pin;
+        wait_us(50);
+        d = (d >> 1) | (b << 7); // shift d to right and insert b in most sig bit position
+    }
+    return d;
+}
+
+

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/onewire.h	Mon Jun 05 21:11:32 2017 +0000
@@ -0,0 +1,56 @@
+/**
+* @file onewire.h
+* @brief library 1-Wire(www.maxim-ic.com)
+* @author Maciej Rajtar (Published 10 May 2010 www.mbed.org)
+* @author Frederic BLANC
+*/
+
+#ifndef _onewire_
+#define _onewire_
+
+//#define DEBUG 1
+//#define DEBUG_L1 1
+#define ONEWIRE_PIN  PB_0
+
+#define MAXSENSORS 16
+
+// rom-code size including CRC
+#define OW_ROMCODE_SIZE 8
+
+#define OW_OK          0x00
+#define OW_ERROR       0x01
+#define OW_START_FAIL  0x02
+#define OW_ERROR_CRC   0x03
+#define OW_ERROR_BAD_ID 0x04
+#define OW_BUSY          0x05
+
+#define OW_MATCH_ROM    0x55
+#define OW_SKIP_ROM     0xCC
+#define OW_SEARCH_ROM   0xF0
+#define OW_READ_ROM     0x33
+#define OW_CONDITIONAL_SEARCH     0xEC
+#define OW_OVERDRIVE_SKIP_ROM     0x3C
+#define OW_OVERDRIVE_MATCH_ROM    0x69
+
+#define OW_SHORT_CIRCUIT   0xFF
+#define OW_SEARCH_FIRST    0xFF        // start new search
+#define OW_PRESENCE_ERR    0x01
+#define OW_DATA_ERR        0xFE
+#define OW_LAST_DEVICE     0x00        // last device found
+//            0x01 ... 0x40: continue searching
+uint8_t search_sensors(uint8_t *nSensors,uint8_t *gSensorIDs );
+uint8_t ow_PullUp(void);
+uint8_t ow_show_id( uint8_t id[], size_t n ,char *text);
+uint8_t ow_test_pin (void);
+uint8_t ow_reset(void);
+uint8_t ow_rom_search( uint8_t diff, uint8_t id[] );
+uint8_t ow_command( uint8_t command, uint8_t id[] );
+uint8_t ow_find_sensor(uint8_t *diff, uint8_t id[]);
+uint8_t ow_parasite_enable(void);
+uint8_t ow_parasite_disable(void);
+uint8_t ow_bit_io( uint8_t b );
+uint8_t ow_byte_wr( uint8_t b );
+uint8_t ow_byte_rd( void );
+
+
+#endif
\ No newline at end of file

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/utils.c	Mon Jun 05 21:11:32 2017 +0000
@@ -0,0 +1,12 @@
+#include <inttypes.h>
+
+uint16_t uint8_to_uint16(uint8_t lsb, uint8_t msb)
+{
+    uint16_t data;
+    uint8_t *ptr;
+    
+    ptr=(uint8_t*)&data;
+    *ptr=lsb;
+    *++ptr=msb;
+    return data;
+}
\ No newline at end of file

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/utils.h	Mon Jun 05 21:11:32 2017 +0000
@@ -0,0 +1,4 @@
+#ifndef _utils_
+#define _utils_
+uint16_t uint8_to_uint16(uint8_t lsb, uint8_t msb);
+#endif
\ No newline at end of file