How to use function in main.c I want to make function about operate state. using interrupt! Plz check my main code. and check my error. Error[Pe065]: expected a ";

[wwgww]

/* USER CODE END Header */
 
/* Includes ------------------------------------------------------------------*/
 
#include "main.h"
 
#include "usart.h"
 
#include "gpio.h"
 
#include "stm32h750xx.h"
 
#include "ESP32.h"
 
#include "stm32h7xx_hal_uart.h"
 
#include "string.h"
 
 
 
extern uint8_t USART2_RX_BUF[USART2_MAX_RECV_LEN];
 
char *uarttx="AT\n\r";
 
uint8_t uartrx[5];
 
int OP_STATE;
 
 
 
/* Private function prototypes -----------------------------------------------*/
 
void SystemClock_Config(void);
 
static void MX_NVIC_Init(void);
 
int main(void)
 
{
 
 /* USER CODE BEGIN 1 */
 
 
 
 /* USER CODE END 1 */
 
 
 
 /* MCU Configuration--------------------------------------------------------*/
 
 
 
 /* Reset of all peripherals, Initializes the Flash interface and the Systick. */
 
 HAL_Init();
 
 
 
 /* USER CODE BEGIN Init */
 
 
 
 /* USER CODE END Init */
 
 
 
 /* Configure the system clock */
 
 SystemClock_Config();
 
 
 
 /* USER CODE BEGIN SysInit */
 
 
 
 /* USER CODE END SysInit */
 
 
 
 /* Initialize all configured peripherals */
 
  MX_GPIO_Init();
 
  esp32_init();
 
 /* Initialize interrupts */
   MX_NVIC_Init();
  /* USER CODE BEGIN 2 */
 
  /* USER CODE END 2 */
 
  /* Infinite loop */
  /* USER CODE BEGIN WHILE */
     
   HAL_UART_Receive_IT (&huart2, USART2_RX_BUF, 512);     
 
int OP_STATE_1(uint8_t * cmd, char * ack, uint16_t waittime){
	int res1 = 0;
	int len = strlen((const char * ) cmd);
	int acklen = strlen((const char * ) ack);
	memset(USART2_RX_BUF, 0, USART2_MAX_RECV_LEN);
	HAL_UART_Transmit( & huart2, cmd, len, 200);
	HAL_UART_Receive_IT( & huart2, USART2_RX_BUF, USART2_MAX_RECV_LEN);
  HAL_Delay(500); 
	if (esp32_check_ack(ack)) 
    res1 = 1;
	return res1;
	
}
     
 int OP_STATE_2(uint8_t * cmd, char * ack, uint16_t waittime) {
	int res2 = 0;
	int len = strlen((const char * ) cmd);
	int acklen = strlen((const char * ) ack);
	memset(USART2_RX_BUF, 0, USART2_MAX_RECV_LEN);
	HAL_UART_Transmit( & huart2, cmd, len, 200);
	HAL_UART_Receive_IT( & huart2, USART2_RX_BUF, USART2_MAX_RECV_LEN);
	if (esp32_check_ack(ack)) 
    res2 = 1;
	return res2;
	
}
 
 int OP_STATE_3(uint8_t * cmd, char * ack, uint16_t waittime) {
	int res3 = 0;
	int len = strlen((const char * ) cmd);
	int acklen = strlen((const char * ) ack);
	memset(USART2_RX_BUF, 0, USART2_MAX_RECV_LEN);
	HAL_UART_Transmit( & huart2, cmd, len, 200);
	HAL_UART_Receive_IT( & huart2, USART2_RX_BUF, USART2_MAX_RECV_LEN);
	if (esp32_check_ack(ack)) 
    res3 = 1;
	return res3;
	
}
 
 
 
 
   while (1)
  {   
     ..........
 
}
 
static void MX_NVIC_Init(void)
{
  /* USART2_IRQn interrupt configuration */
  HAL_NVIC_SetPriority(USART2_IRQn, 0, 0);
  HAL_NVIC_EnableIRQ(USART2_IRQn);
}
 
/* USER CODE BEGIN 4 */
void HAL_UART_RxCpltCallback(UART_HandleTypeDef *huart)
{
     
    HAL_UART_Transmit(&huart2, USART2_RX_BUF, 12, 500);
    HAL_UART_Receive_IT(&huart2, USART2_RX_BUF, 12);
    
  if(huart->Instance == USART2)
	{
		
    HAL_UART_Receive_IT (&huart2, USART2_RX_BUF,1); 
    HAL_UART_Transmit (&huart2, USART2_RX_BUF, 1, 10);
      
        
    if(esp32_check_ack("OK")){
      HAL_UART_Transmit (&huart2, USART2_RX_BUF, 1, 10);
 		}else{
      
 
    }

[TDK]

You can’t define a function within another function. Move your function definitions outside of main(). This is super basic C knowledge.

[wwgww]

oh.. I'm so bad at coding thx!

BTW, Can I use global variable in this code?

I want to make a buffer and put the return value in it.

[TDK]

Yes, you can use global variables.

It may be hard to make a complex program with limited knowledge. Perhaps start with some known working examples to build your skill set.