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Uart_set_parity() selected out of uart_parity_t Uart_set_word_length() selected out of uart_word_length_t Functions for Configuring specific parameters individually These functions are also useful if re-configuring a single parameter. Multiple Steps Ĭonfigure specific parameters individually by calling a dedicated function from the table given below.
#UART SERIAL COMMUNICATION PDF HOW TO#
See the example below.Ĭonst uart_port_t uart_num = UART_NUM_2 uart_config_t uart_config = // Configure UART parameters ESP_ERROR_CHECK ( uart_param_config ( uart_num, & uart_config )) įor more information on how to configure the hardware flow control options, please refer to peripherals/uart/uart_echo. The uart_config_t structure should contain all the required parameters. Single Step Ĭall the function uart_param_config() and pass to it a uart_config_t structure. UART communication parameters can be configured all in a single step or individually in multiple steps. This identification is needed for all the following function calls. The UART driver’s functions identify each of the UART controllers using uart_port_t. Step 4 is where the UART starts operating. Steps 1 to 3 comprise the configuration stage.
#UART SERIAL COMMUNICATION PDF DRIVER#
Using Interrupts - Triggering interrupts on specific communication eventsĭeleting a Driver - Freeing allocated resources if a UART communication is no longer required Running UART Communication - Sending / receiving data Setting Communication Pins - Assigning pins for connection to a device.ĭriver Installation - Allocating ESP32’s resources for the UART driver. Setting Communication Parameters - Setting baud rate, data bits, stop bits, etc. The overview reflects a typical programming workflow and is broken down into the sections provided below: The following overview describes how to establish communication between an ESP32 and other UART devices using the functions and data types of the UART driver. All the controllers are compatible with UART-enabled devices from various manufacturers and can also support Infrared Data Association protocols (IrDA). The ESP32 chip has three UART controllers (also referred to as port), each featuring an identical set of registers to simplify programming and for more flexibility.Įach UART controller is independently configurable with parameters such as baud rate, data bit length, bit ordering, number of stop bits, parity bit etc. A UART provides a widely adopted and cheap method to realize full-duplex or half-duplex data exchange among different devices. Universal Asynchronous Receiver/Transmitter (UART) Overview Ī Universal Asynchronous Receiver/Transmitter (UART) is a hardware feature that handles communication (i.e., timing requirements and data framing) using widely-adopted asynchronous serial communication interfaces, such as RS232, RS422, RS485.