Variables are showing nothing in Live expression window

[mahmanish]

Hi Guys,

This is my simple ADC program and i was expecting to see some data output on Live expression window. Instead it is showing "Failed to evaluate"

//initialization:

/* USER CODE BEGIN 1 */
uint16_t raw;
char msg[10];

/* USER CODE END 1 */

//while loop
{
//set GPIO Pin high PA8
HAL_GPIO_WritePin(GPIOA, GPIO_PIN_8, GPIO_PIN_SET);
// GEt ADC Value

HAL_ADC_Start(&hadc1);

HAL_ADC_PollForConversion(&hadc1, HAL_MAX_DELAY);

raw= HAL_ADC_GetValue(&hadc1);

//convert the string and print

sprintf(msg, "%h\r\n", raw);

HAL_UART_Transmit(&huart3, (uint8_t*)msg, strlen(msg), HAL_MAX_DELAY);

HAL_Delay(1);

/* USER CODE END WHILE */


/* USER CODE BEGIN 3 */

}

The same issue is not happening when i am using Black pill board and all live expressions are visible.

[Andrew Neil]

Please see the posting tips for how to properly post source code:

https://community.st.com/t5/community-guidelines/how-to-write-your-question-to-maximize-your-chances-to-find-a/ta-p/575228

---

@mahmanish wrote:

The same issue is not happening when i am using Black pill board

---

So what board are you using when the issue does happen ?

Does the correct output appear from your UART ?

[mahmanish]

Sorry for my ignorance. I am new to this community site.

My board is Nucleo H7A3ZI 144 pin.

Regarding UART, output is appearing jumbled on Terminal (screen shot attached) .

I am not able to evaluate any live expressions. While with same code i am able to see live expressions in my STM F4 black pill board. (screen shot attached).

So i belive, i am missing some setting of Nucleo H7A3ZI board and that is creating problem. 

What is your opinion?

[SofLit]

Hello @mahmanish and welcome to the community.

You need to use </> button to paste your code.

I'm editing your post then ..

[SofLit · Accepted solution]

And try to declare raw variable as global.

[mahmanish]

This was too bad for me to see this mistake. I wasted so much time on this. Fianlly everything is in order. 

Thank you so much SofLit.