psoc6-evaluationkit-062S2 ADC0 return value not right when connecting with VDD (3.3V)

[hywing]

Environment

board : psoc6-evaluationkit-062S2 bsp : PSOC62-IFX-EVAL-KIT 1.1.1 rt-thread : 5.0.1 RT-Thread Studio : 2.2.6

I had a problem when I tried to run this code below

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#include <rtthread.h>

#define DBG_TAG "main" #define DBG_LVL DBG_LOG #include <rtdbg.h> #include <board.h> #include <rtdevice.h>

#define ADC_DEV_NAME "adc1"
#define ADC_DEV_CHANNEL 0
#define REFER_VOLTAGE 330
#define CONVERT_BITS (1 << 12)

rt_thread_t Adc_thread = RT_NULL;

static void Adc_entry(void* paremeter);

int main(void) { Adc_thread = rt_thread_create("adc1", Adc_entry, RT_NULL, 512, 16, 20); if(Adc_thread != RT_NULL) rt_thread_startup(Adc_thread); else return -1; }

static void Adc_entry(void* paremeter) { rt_adc_device_t adc_dev; rt_uint32_t value,vol; rt_err_t ret = RT_EOK; adc_dev = (rt_adc_device_t)rt_device_find(ADC_DEV_NAME); if (adc_dev == RT_NULL) { rt_kprintf("adc sample run failed! can't find %s device!\n", ADC_DEV_NAME); } ret = rt_adc_enable(adc_dev, ADC_DEV_CHANNEL); if(ret == RT_EOK) { rt_kprintf("adc sample run success! find %s device!\n", ADC_DEV_NAME); } while(1) { value = rt_adc_read(adc_dev, ADC_DEV_CHANNEL); rt_kprintf("the value is :%d \n", value); vol = value * REFER_VOLTAGE / CONVERT_BITS; rt_kprintf("the voltage is :%d.%02d \n", vol / 100, vol % 100); rt_thread_delay(500); } }

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My Config

The ADC config is initialized as 12-bit resolution and I connect ADC0 (P10_0) with VDD

Result

The return value (2047) is not right which is half of 4096 (3.3V)

[hywing]

The truth is that function cyhal_adc_read_uv gets the right value of 3.3V instead of cyhal_adc_read