You do not need to modify these parameters for now, just use the default values and make sure the config on both sides of communication is the same. According to the standard of uart, it sends 1 start bit (must), 5/6/7/8 bits of data (not 9), 1 bit of parity check (optional),1/1.5/2 bit of stop bit. Word Length, Parity and Start/Stop Bits**ĭuring transformation, data is sent in **a packet**.
COOLTERM TUTORIAL SERIAL
To check which serial ports can be used as UART, you need to take a look on the main board, there should be small text `UART X` (Should be UART 1 and 3). As there is no way for the receiving side to determine the transmission speed dynamically, we need to predefine the same **baud rate** on both sides for the communication. In other words, the clocks of the STM32 and the bluetooth device may be different. For example, if we want to transmit data from UART1 to UART2, data will be sent bit by bit from the **TX pins** and received by the **RX pins**.Īsynchronous means that there is no common clock signal between the sender and receivers. Serial communication is the process of sending data one bit at a time. UART sends your data in serial, **asynchronous** mode. In our embedded system, UART is commonly used between two different boards or when trying to send data from an mobile/desktop application to your board using bluetooth. For example, UART could be used to send control commands but it isn't suitable to send high resolution images. UART is a protocol used for serial communication and is used when the rate of transmission is not a concern. # Universal Asynchronous Receiver-Transmitter (UART) This calls for communication protocols, which aims to allow devices to communicate with each other using as few wires as possible.
What if we want to transfer 32-bit data? We would need a lot of wires.
Imagine you want to transfer 8-bit data to another board, one way is to connect 8 wires to another board: # Lesson Four - Communication Protocol (UART)įurther Modified by Vivian Chan Introduction
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