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ADC TMS5700432 Temperature

Dzung Nguyen70
Intellectual 260 points
Other Parts Discussed in Thread: TMS5700432, HALCOGEN

Hello everyone, I am working with TMS5700432 HDK. I would like to read ADC value and convert it to degrees Celsius. I applied formulas on the forums for conversion; however, the results is wrong and in the hex (rether than in decimal as expected). May somebody recommend me other formula? This is my code:

 adcData_t adc_data;
    adcData_t *adc_data_ptr = &adc_data;

     /** - Start Group1 ADC Conversion
     *     Select Channel 8 - Temprature Sensor for Conversion
     */
    adcStartConversion_selChn(adcREG1, Temperature_Sensor, 1, adcGROUP1);

     /** - Wait for ADC Group1 conversion to complete */
     while(!adcIsConversionComplete(adcREG1, adcGROUP1));

    /** - Read the conversion result
    *     The data contains the Temprature sensor data
    */
    adcGetSingleData(adcREG1, adcGROUP1, adc_data_ptr);

    /** - Transnmit the Conversion data to PC using SCI
    */
    temp=  adc_data_ptr->value*423/1024 - 278;
    sciSend_32bitdata(scilinREG, ((unsigned int) (temp)));

Is there anyone ever do this problem before. How can we read the temperature correctly?

  • 0
    TI__Mastermind 49120 points
    Hello,

    Can you post the adcGetSingleData and sciSend_32bitdata function bodies? These are not generated by HALCoGen.
  • 0 in reply to Sunil Oak
    Intellectual 260 points

    Yeah, i took these functions from "Hercules Safety MCU Demos" program.

    void adcGetSingleData(adcBASE_t *adc, unsigned group, adcData_t *data)
{
    unsigned  buf;
    adcData_t *ptr = data; 

    /** -  Get conversion data and channel/pin id */
    buf        = adc->GxBUF[group].BUF0;
    ptr->value = (unsigned short)(buf & 0xFFFU);
    ptr->id    = (unsigned short)((buf >> 16U) & 0x1FU); // int to unsigned short

    adc->GxINTFLG[group] = 9U;

    /**   @note The function canInit has to be called before this function can be used.\n
    *           The user is responsible to initialize the message box.
    */
}
    void sciSend_32bitdata(sciBASE_t *sci, unsigned int data)
{
	unsigned char c_get ;
  	volatile int i = 0;
  	for( i = 8 ; i > 0 ; i-- )
  	{
 		c_get = (data>>28)&15 ;
		if( c_get > 9 )
			c_get += 7 ;
		c_get += 48 ;
		while ((sci->FLR & SCI_TX_INT) == 0) { /* wait */ };
		sci->TD = c_get;
		data = data<<4 ;
	}
}

    void adcStartConversion_selChn(adcBASE_t *adc, unsigned channel, unsigned fifo_size, unsigned group)
{
    /** - Setup FiFo size */
    adc->GxINTCR[group] = fifo_size;

    /** - Start Conversion */
    adc->GxSEL[group] = 1 << channel;
}