Hi, Jeethan
I checked by disabling these registers that you have pointed out.
Please check the following code.
~~~~
/* ADC is configured */
static void ADCConfigure(void)
{
/* Enable the clock for touch screen */
TSCADCModuleClkConfig();
TSCADCPinMuxSetUp();
/* Configures ADC to 3Mhz */
TSCADCConfigureAFEClock(TSC_ADC_INSTANCE, 24000000, 3000000);
/* Disable Transistor bias */ // <--- modified
TSCADCTSTransistorConfig(TSC_ADC_INSTANCE, TSCADC_TRANSISTOR_DISABLE);
TSCADCStepIDTagConfig(TSC_ADC_INSTANCE, 1);
/* Disable Write Protection of Step Configuration regs*/
TSCADCStepConfigProtectionDisable(TSC_ADC_INSTANCE);
/* Configure step 1 for channel 1(AN0)*/
StepConfigure(0, TSCADC_FIFO_0, TSCADC_POSITIVE_INP_CHANNEL1);
/* Configure step 2 for channel 2(AN1)*/
StepConfigure(1, TSCADC_FIFO_1, TSCADC_POSITIVE_INP_CHANNEL2);
/* General purpose inputs */
TSCADCTSModeConfig(TSC_ADC_INSTANCE, TSCADC_GENERAL_PURPOSE_MODE);
/* Enable step 1 */
TSCADCConfigureStepEnable(TSC_ADC_INSTANCE, 1, 1);
/* Enable step 2 */
TSCADCConfigureStepEnable(TSC_ADC_INSTANCE, 2, 1);
/* Clear the status of all interrupts */
CleanUpInterrupts();
/* End of sequence interrupt is enable */
TSCADCEventInterruptEnable(TSC_ADC_INSTANCE, TSCADC_END_OF_SEQUENCE_INT);
/* Enable the TSC_ADC_SS module*/
TSCADCModuleStateSet(TSC_ADC_INSTANCE, TSCADC_MODULE_ENABLE);
}
/* Configures the step */
void StepConfigure(unsigned int stepSel, unsigned int fifo, unsigned int positiveInpChannel)
{
/* Configure ADC to Single ended operation mode */
TSCADCTSStepOperationModeControl(TSC_ADC_INSTANCE, TSCADC_SINGLE_ENDED_OPER_MODE, stepSel);
/* Configure step to select Channel, refernce voltages */
TSCADCTSStepConfig(TSC_ADC_INSTANCE, stepSel, TSCADC_NEGATIVE_REF_VSSA, positiveInpChannel, TSCADC_NEGATIVE_INP_CHANNEL1, TSCADC_POSITIVE_REF_VDDA);
/* XPPSW Pin is off, Which pull up the AN0 line*/ // <--- modified
TSCADCTSStepAnalogSupplyConfig(TSC_ADC_INSTANCE, TSCADC_XPPSW_PIN_OFF, TSCADC_XNPSW_PIN_OFF, TSCADC_YPPSW_PIN_OFF, stepSel);
/* XNNSW Pin is off, Which pull down the AN1 line*/ // <--- modified
TSCADCTSStepAnalogGroundConfig(TSC_ADC_INSTANCE, TSCADC_XNNSW_PIN_OFF, TSCADC_YPNSW_PIN_OFF, TSCADC_YNNSW_PIN_OFF, TSCADC_WPNSW_PIN_OFF, stepSel);
/* select fifo 0 or 1*/
TSCADCTSStepFIFOSelConfig(TSC_ADC_INSTANCE, stepSel, fifo);
/* Configure ADC to one short mode */
TSCADCTSStepModeConfig(TSC_ADC_INSTANCE, stepSel, TSCADC_ONE_SHOT_SOFTWARE_ENABLED);
}
~~~~
However, Low voltage is observed.
- AIN0 is 400mV
- AIN1 is 200mV
Best regards,
Chi