This code will wait till the button is pressed and then send the data. Code to store the message in the global space.įirst, place the button code after peripheral control, as shown in Figure 12, so as to trigger the transmission only when the button is pressed. For USART_SendData(), you have to give the parameter, as shown in Figure 10, and the message will be a small message which is there in the global space UART Tx Testing (Figure 11). Activate the USART peripheral: You have to enable the USART peripheral in the main function, as shown in Figure 9. Code to configure the USART_SetBaudRate().Ĩ. Implementation of USART2_Init().įigure 7. If you are not yet placed this code, then please complete this USART_SetBaudRate(), as shown in Figure 8.įigure 6. Therefore, resolve all the TODOs and complete the USART_Init() API, and at the end, there must be USART_SetBaudRate() function, where the baud rate is configured. Otherwise, the application will not work properly. Remember that in the USART_Init, everything should be completed, as shown in Figure 7. The parity will be disabled since you are not going to use any parity here.The word length will be 8 bits of user data.Initialize the USART_Mode to USART_MODE_ONLY_TX since you are Txing the data, not RXing. ![]() Hardware control is not required for this application.For this application, let’s use the baud rate of 115200bps. Mention the base address of the USART peripheral that you want to use in the application. ![]() Implement USART2_Init() (Figure 6): In this section, the handle variables are initialized as follows: So, you can keep either speed fast, medium, it doesn’t matter. That means you can activate the internal pull-up resistor.Īfter that, the speed can be anything. You can use an internal pull-up resistor (GPIO_PIN_PU). Here the pin mode will be an alternate function, output type you can use push-pull, need not to use the open drain. Implement the USART2_GPIOInit() (Figure 5): Initialize GPIOA pin number 2 and GPIOA pin number 3 for the alternate functionality mode 7, as shown in Figure 5. Download the sketch 001UARTRxString.ino into the Arduino board.Ħ. Connection between Arduino board and STM32.ĥ. The logic analyzer is optional use only if you have it. Make sure that you connect the ground to the ground point and channel 0 of the logic analyzer to TX pin and channel 1 to the RX pin. If you have a logic analyzer, then you can use it. After that, connect the ground points of both the boards to a common ground. On Arduino, the TX pin will be digital pin number 1. Then connect PA3, i.e., RX of STM32 board, to the TX pin of the Arduino board. ![]() So, connect TX to the RX pin of the Arduino board. The UART_RX pin on the Arduino board is digital pin number 0. In Figure 4, you can see that the PA2, i.e., TX, must be connected to the RX pin of the Arduino board. After the selection of pins, you have to make the connection with the Arduino board. But select the pins according to your board and according to the availability of those pins on the header of your board.Ĥ. PA3 can be used as USART2_RX, and you should keep the alternate functionality mode AF7. You can see in the alternate function mapping table of our microcontroller, PA2 can be used as USART2_TX, and the alternate function mode should be 7. Configure the pins for the USART2 peripheral: You should use 2 pins that are TX and RX, which you can get from the alternate functionality table (Figure 3) of the datasheet. For this application, you can use any USART peripheral you want. First, you have to do the GPIO_Init for the USART peripheral. The application with the name 015uart_tx.c is already created, as shown in Figure 1. Consider the baud rate as 115200bps, and the frame format would be 1 stop bit, 8 bits of user data, and no parity.ġ. The Arduino board will display the message that is sent from the ST board on its serial monitor. Write a program to send some data or some message over UART from STM32 board to Arduino board. Now let’s test the USART_SendData API with one exercise.
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