...
/* USER CODE BEGIN Includes */#include "stdio.h"/* USER CODE END Includes */
...
char buf[50];int len =0;
...
len=sprintf(buf,"i = %d \r\n", i); HAL_UART_Transmit(&huart1,(uint8_t*)buf, len,1000);
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/* USER CODE BEGIN Includes */
#include "stdio.h"
/* USER CODE END Includes */
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char buf[50];
int len = 0;
...
len = sprintf (buf, "i = %d \r\n", i); HAL_UART_Transmit(&huart1, (uint8_t *)buf, len, 1000);