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Hi to all I am new in STM32 and keil (I used Atmel chips) and now I am getting familier with them. I made a project and I can send data to serial port with the following function : "HAL_UART_Transmit(&huart1,(uint8_t *) "Hello\n\r", 7, 10);" but I do not know why there is no data when I use the following function based on sprintf: "sprintf((char *) buffer,"23");"
The thing is that the code is well compiled and there is no error but the function does not work. Do I need to add some more code for sprintf function ??!!!
Help please
Hi thanks for your help and I do apologize for not clarifying the problem. I added my code but I do not know why it did not show there. I guess I did something wrong. here is my simple code.
it is a simple code. it waits until a push button pressed, then it turns on a LED and sends 3 data to PC console with 3 different fucntion. 1- MCU transmit fucntion. 2- filling a string with sprintf function and sending with MCU transmit function. 3- with printf function.
I use this code to check how different functions work in STM32F0 and keil especially stdio library. it works but instead of having value 23 with printf function, I have two Small square on screen. I could not add the picture of my console but I guess you got what I mean.
/* Includes ------------------------------------------------------------------*/ #include "main.h" #include "stm32f0xx_hal.h" #include "stdio.h" /* USER CODE BEGIN Includes */ /* USER CODE END Includes */ /* Private variables ---------------------------------------------------------*/ UART_HandleTypeDef huart1; /* USER CODE BEGIN PV */ /* Private variables ---------------------------------------------------------*/ char buffer[20]; char a[1] = "A"; /* USER CODE END PV */ /* Private function prototypes -----------------------------------------------*/ void SystemClock_Config(void); static void MX_GPIO_Init(void); static void MX_USART1_UART_Init(void); /* USER CODE BEGIN PFP */ /* Private function prototypes -----------------------------------------------*/ /* USER CODE END PFP */ /* USER CODE BEGIN 0 */ struct __FILE {int hndle;}; FILE __stdout; FILE __stdin; FILE __stderr; int fputc(int ch, FILE *f) { while (!HAL_UART_GetState(&huart1)); HAL_UART_Transmit(&huart1,(uint8_t *) ch, 20,100); return ch; } /* USER CODE END 0 */ 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(); MX_USART1_UART_Init(); /* USER CODE BEGIN 2 */ HAL_UART_Transmit(&huart1,(uint8_t *) "Hello", 5, 10); /* USER CODE END 2 */ /* Infinite loop */ /* USER CODE BEGIN WHILE */ while (1) { /* USER CODE END WHILE */ /* USER CODE BEGIN 3 */ if (HAL_GPIO_ReadPin (GPIOA,GPIO_PIN_0) == 1){ HAL_GPIO_WritePin(GPIOC,LD3_Pin,GPIO_PIN_SET); HAL_UART_Transmit(&huart1,(uint8_t *) "Hello\n\r", 7, 10); sprintf(buffer,"hello world"); HAL_UART_Transmit(&huart1,(uint8_t *) buffer, 20, 10); printf("23"); HAL_Delay(300); } else if (HAL_GPIO_ReadPin(GPIOA,GPIO_PIN_0) == 0){ HAL_GPIO_WritePin(GPIOC,LD3_Pin,GPIO_PIN_RESET); } } /* USER CODE END 3 */ }