![]() With it you can type a line of text, none of which is sent to the Arduino board until you click the send button. You can use this function on its own, however since serial is mostly used to print debug messages, it's a better idea to get printf() working instead.The Arduino serial monitor works differently to any of the utilities you can use with PlatfomIO. Click here for details about this function. Therefore, we're simply using HAL_UART_Transmit(). DMA is an advanced topic and currently not covered in this series. We'll be using blocking mode in this lesson, and interrupt mode in the upcoming ones. Take a look at this guide to learn about the I/O modes in STM32 HAL. However, they are all suffixed with either nothing, or _IT, or _DMA. That's a lot of choices ending in _Transmit and _Receive. HAL_StatusTypeDef HAL_UART_Receive_DMA(UART_HandleTypeDef *huart, uint8_t *pData, uint16_t Size) HAL_StatusTypeDef HAL_UART_Transmit_DMA(UART_HandleTypeDef *huart, uint8_t *pData, uint16_t Size) HAL_StatusTypeDef HAL_UART_Receive_IT(UART_HandleTypeDef *huart, uint8_t *pData, uint16_t Size) HAL_StatusTypeDef HAL_UART_Transmit_IT(UART_HandleTypeDef *huart, uint8_t *pData, uint16_t Size) HAL_StatusTypeDef HAL_UART_Receive(UART_HandleTypeDef *huart, uint8_t *pData, uint16_t Size, uint32_t Timeout) HAL_StatusTypeDef HAL_UART_Transmit(UART_HandleTypeDef *huart, uint8_t *pData, uint16_t Size, uint32_t Timeout) Looking at the stm32f0xx_hal_uart.h, we find the following functions: Remember what to do when encountering a new peripheral? Yep, we go and see what functions we can use in the HAL library files. Now we're ready to code our "Hello World" program. After it's done, click Open Project button to launch Keil MDK. The best practice to keep Keil MDK closed while regenerating the code in STM32CubeMX, this keep things consistent and less likely to corrupt the project files. That's it for the CubeMX! Make sure the Keil MDK is closed, and regenerate the code: While you're here take a look at the Advanced Features, so many options! It even has TX/RX pin swapping for when you forget to cross the wires! What a world we're living in. ![]() Only thing actually needs changing is the baud rate, 115200bps is used in this case. Click the newly appeared button to adjust a few settings. Follow this short guide to switch them around. However, the UART header on our board is actually connected to PA9/PA10 instead of PA2/PA3. This time we expand USART1 and select Asynchronous mode. Which will take you back to the pin view page: We will be reusing the entire project from the last lesson, so just make a new copy of the project folder. HookupĪ serial-to-USB adapter is used in this lesson, connect the RXD on the adapter to the TXD on the dev board, and connect the GND of dev board and adapter together. Of course you can use your preferred terminal emulators too. If you need a refresher on serial communications, Speakfun has an excellent tutorial.ĬoolTerm is used to view our serial messages, so check out this guide. There is no need to elaborate on how important UARTs are in embedded systems, so let's get right to it! Recommended Readings In this lesson we'll set up the UART, then use printf() to print our hello world over serial. Lesson 6: Real-time Operating Systems (RTOS) Lesson 3: UART Receive and External Files Landing Page: Intro and Required Hardwares
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