Maciej Rajtar / Mbed 2 deprecated OneWireDrv

Test 1-wire , working wtih parasite power and few sensors with mixed power supply.

Dependencies:   mbed

main.cpp@0:1197076b78f4, 2010-05-10 (annotated)

Committer:
macraj
Date:
Mon May 10 08:14:32 2010 +0000
Revision:
0:1197076b78f4

        

        
Who changed what in which revision?

        

            
                
UserRevisionLine numberNew contents of line

            
            


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#include "mbed.h"





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#include "onewire.h"





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BYTE gSensorIDs[MAXSENSORS][OW_ROMCODE_SIZE];





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Serial pc(USBTX, USBRX); // tx, rx





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BYTE search_sensors(void) {





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    BYTE i;





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    BYTE id[OW_ROMCODE_SIZE];





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    BYTE diff, nSensors;





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    printf( "Scanning Bus for DS18X20\n" );





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    nSensors = 0;





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    for ( diff = OW_SEARCH_FIRST;





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            diff != OW_LAST_DEVICE && nSensors < MAXSENSORS ; ) {





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        DS18X20_find_sensor( &diff, &id[0] );





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        if ( diff == OW_PRESENCE_ERR ) {





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            printf( "No Sensor found\n" );





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            break;





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        }





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        if ( diff == OW_DATA_ERR ) {





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            printf( "Bus Error\n" );





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            break;





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        }





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        for (i=0;i<OW_ROMCODE_SIZE;i++)





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            gSensorIDs[nSensors][i]=id[i];





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        nSensors++;





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    }





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    return nSensors;





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}





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void uart_put_temp(const uint8_t subzero, uint8_t cel, uint8_t cel_frac_bits) {





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//   uint8_t buffer[sizeof(int)*8+1];





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    uint16_t decicelsius;





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    float temperature;





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    pc.printf("[%s", (subzero)?"-":"+");





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//    pc.printf("%d.",cel);





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    //itoa((cel_frac_bits*DS18X20_FRACCONV),buffer,10);





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    //sprintf(buffer, "%d",(cel_frac_bits*DS18X20_FRACCONV));





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    //j=4-strlen(buffer);





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    //for (i=0;i<j;i++) pc.printf("0");





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    //pc.printf("%s °C [",buffer);





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//    pc.printf("  freak %d ::", (cel_frac_bits*DS18X20_FRACCONV));





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    // "rounding"





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    //pc.printf((subzero)?'-':'+');





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    decicelsius = DS18X20_temp_to_decicel(subzero, cel, cel_frac_bits);





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    temperature = decicelsius;





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    temperature = temperature/10;





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    pc.printf("%4.1f C]\n", temperature);





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    //pc.printf( "%d 0°C]\n",decicelsius);





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}





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int main(void) {





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    pc.printf("Qantum 1 wire interface test!\n");





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    uint8_t nSensors, i;





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    uint8_t subzero, cel, cel_frac_bits;





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    nSensors = search_sensors();





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    ow_command( DS18X20_CONVERT_T, 0);





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    pc.printf("Sensors found : %d\n", nSensors);





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    if (nSensors > 0) {





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        for (i=0; i<nSensors; i++) {





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            pc.printf("Sensor # %d is a ", i+1);





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            if ( gSensorIDs[i][0] == DS18S20_ID) {





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                pc.printf("DS18S20/DS1820 ");





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            } else pc.printf("DS18B20 ");





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            if ( DS18X20_get_power_status( &gSensorIDs[i][0] ) ==





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                    DS18X20_POWER_PARASITE )





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                pc.printf( "parasite" );





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            else pc.printf( "externally" );





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            pc.printf( " powered\n" );





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            DS18X20_show_id_uart( &gSensorIDs[i][0], OW_ROMCODE_SIZE );





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        }





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    }





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    pc.printf( "Convert_T and Read Sensor by Sensor (reverse order)\n" );





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    for ( i=nSensors; i>0; i-- ) {





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        if ( DS18X20_start_meas( DS18X20_POWER_PARASITE, &gSensorIDs[i-1][0] ) == DS18X20_OK ) {





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            wait_ms(DS18B20_TCONV_12BIT);





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            pc.printf("Sensor# %d = ", i);





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            if ( DS18X20_read_meas( &gSensorIDs[i-1][0], &subzero, &cel, &cel_frac_bits) == DS18X20_OK ) {





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                uart_put_temp(subzero, cel, cel_frac_bits);





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            } else pc.printf("CRC Error (lost connection?)\n");





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        } else pc.printf("Start meas. failed (short circuit?)\n");





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    }





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    while (1) {





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        for ( i=nSensors; i>0; i-- ) {





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            // if ( DS18X20_start_meas( DS18X20_POWER_PARASITE, &gSensorIDs[i-1][0] ) == DS18X20_OK ) {





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            pc.printf("Sensor# %d = ", i);





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            if ( DS18X20_read_meas( &gSensorIDs[i-1][0], &subzero, &cel, &cel_frac_bits) == DS18X20_OK ) {





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                uart_put_temp(subzero, cel, cel_frac_bits);





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            } else pc.printf("CRC Error (lost connection?)\n");





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            //if ( DS18X20_start_meas( DS18X20_POWER_PARASITE, &gSensorIDs[i-1][0] ) == DS18X20_OK ) {





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            //} else pc.printf("Start meas. failed (short circuit?)\n");





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        }





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            ow_command( DS18X20_CONVERT_T, 0);





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            ow_parasite_enable();





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        //  ow_reset();





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        //   ow_command( DS18X20_CONVERT_T, 0);





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        //   ow_parasite_enable();





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        wait(10);





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        //   ow_parasite_disable();





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    }





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}





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