uart interfacing with tms320c5505 tyro

Description: The TMS320C5505 Evaluation Board is specifically designed for developers in the DSP field as well as for beginners. The kit is structured in such a way that all possible features of the DSP can be easily utilized by everyone. UART (Universal Asynchronous Receiver Transmitter) is one of the fundamental interfaces that provide a cost-effective, simple, and reliable means of communication between one controller and another or between a controller and a PC. Typically, all digital ICs operate on TTL or CMOS voltage levels, which cannot be used for communication over the RS-232 protocol. Therefore, a voltage or level converter is required to convert TTL to RS-232 and RS-232 to TTL voltage levels. The most commonly used RS-232 level converter is the MAX232. This IC includes a charge pump that generates RS-232 voltage levels (-10V and +10V) from a 5V power supply. It also features two receivers and two transmitters, allowing for full-duplex UART/USART communication. RS-232 communication facilitates point-to-point data transfer and is frequently used in data acquisition applications for transferring data between a microcontroller and a PC. To communicate over SCI, UART, or USART, three basic signals are necessary: RXD (receive), TXD (transmit), and GND (common ground). To interface UART with the TMS320F2812, only these basic signals are required. The goal is to display text on a PC from the C5505 Evaluation Board using the SCI module. The C5505 Evaluation Board contains the TMS320C5505 Processor, which has two serial interfaces: SCI A and SCI B. In this case, SCI A is utilized, with the transmitter pins sending data to the PC.

The TMS320C5505 Evaluation Board serves as an essential platform for both novice and experienced developers in the domain of digital signal processing (DSP). Its design emphasizes user accessibility, allowing users to explore the full capabilities of the DSP without extensive prior knowledge. Central to its communication functionality is the UART interface, which is integral for establishing reliable data exchanges between microcontrollers and external devices, such as personal computers.

The integration of the MAX232 level converter is crucial for ensuring compatibility between the TTL or CMOS voltage levels of the DSP and the RS-232 protocol, which operates at different voltage levels. The MAX232 not only converts these levels but also provides the necessary full-duplex communication capability, allowing simultaneous sending and receiving of data. This feature is particularly beneficial for applications requiring real-time data transfer, such as monitoring and control systems.

The communication setup involves connecting the RXD and TXD pins of the UART interface to the corresponding pins on the MAX232, with the GND pin serving as a common reference. This configuration enables seamless data transmission from the TMS320C5505 Processor to the PC. The use of the SCI A interface for transmitting data facilitates straightforward programming and implementation of communication protocols.

In practical applications, this setup can be employed for tasks such as sending sensor data, system status updates, or any text-based information that needs to be displayed on a PC. The simplicity of the UART communication allows developers to focus on higher-level programming and DSP algorithm development, thereby enhancing productivity and innovation in DSP applications.The TMS320C5505 EVALUATION BOARD is specially desgined for developers in dsp field as well as beginners. The kit is designed in such way that all the possible features of the DSP will be easily used by the everyone.

UART (Universal Asynchronous Receiver Transmitter) are one of the basic interfaces which provide a cost effective simple and reliable communication between one controller to another controller or between a controller and PC. Usually all the digital ICs work on TTL or CMOS voltage levels which cannot be used to communicate over RS-232 protocol. So a voltage or level converter is needed which can convert TTL to RS232 and RS232 to TTL voltage levels.

The most commonly used RS-232 level converter is MAX232. This IC includes charge pump which can generate RS232 voltage levels (-10V and +10V) from 5V power supply. It also includes two receiver and two transmitters and is capable of full-duplex UART/USART communication.

RS-232 communication enables point-to-point data transfer. It is commonly used in data acquisition applications, for the transfer of data between the microcontroller and a PC. Fig. 1 shows how to interface the UART to microcontroller. To communicate over SCI, UART or USART, we just need three basic signals which are namely, RXD (receive), TXD (transmit), GND (common ground).

So to interface UART with TMS320F2812 we just need the basic signals. We now want to display a text in PC from C5505 Evaluation Board by using SCI module. In C5505 Evaluation Board contains TMS320C5505 Processor, it has two serial interfaces that are SCI A & SCI B. Here we are using SCI A. The Transmitter pins send the data into PC.