ADC_MR |= ((ADC_PRESCALER << ADC_PRESCALER_SHIFT) & ADC_PRESCALER_MASK);
LOG_INFO("prescaler[%ld]\n", ADC_PRESCALER);
ADC_MR |= ((CONFIG_ADC_SUT << ADC_STARTUP_SHIFT) & ADC_STARTUP_MASK);
ADC_MR |= ((ADC_PRESCALER << ADC_PRESCALER_SHIFT) & ADC_PRESCALER_MASK);
LOG_INFO("prescaler[%ld]\n", ADC_PRESCALER);
ADC_MR |= ((CONFIG_ADC_SUT << ADC_STARTUP_SHIFT) & ADC_STARTUP_MASK);
/* Register and enable irq for adc. */
sysirq_setHandler(INT_ADC, adc_conversion_end_irq);
/* Register and enable irq for adc. */
sysirq_setHandler(INT_ADC, adc_conversion_end_irq);