Uart driver

Setting Communication Pins - Assigning pins for connection to a device. Using Interrupts - Triggering interrupts on specific communication events. Steps 1 to 3 comprise the configuration stage.

Step 4 is where the UART starts operating. Steps 5 and 6 are optional. This identification is needed for all the following function calls. UART communication parameters can be configured all in a single step or individually in multiple steps.

See the example below. Configure specific parameters individually by calling a dedicated function from the table given below.

These functions are also useful if re-configuring a single parameter. Once this step is complete, you can connect the external UART device and check the communication.

The function will copy the data to the Tx ring buffer either immediately or after enough space is available , and then exit. The code below demonstrates the use of this function. Instead, it will write all data which can immediately fit into the hardware Tx FIFO, and then return the number of bytes that were written.

An example of using these functions is given below. The UART controller supports a number of communication modes. There are many interrupts that can be generated following specific UART states or detected errors.

The API provides a convenient way to handle specific interrupts discussed in this document by wrapping them into dedicated functions:. FIFO space threshold or transmission timeout reached : The Tx and Rx FIFO buffers can trigger an interrupt when they are filled with a specific number of characters, or on a timeout of sending or receiving data.

To use these interrupts, do the following:. It can be used, e. The following functions are available:. The API also defines several macros.

The term collision means that a transmitted datagram is not equal to the one received on the other end. Data collisions are usually associated with the presence of other active devices on the bus or might occur due to bus errors. The collision detection feature allows handling collisions when their interrupts are activated and triggered. In the case of using circuit A or B, the RTS pin connected to the DE pin of the bus driver should be controlled by the user application. To use this mode, the software would have to disable the hardware flow control function.

This mode works with all the used circuits shown below. The schematics below do not necessarily contain all required elements. This circuit is preferable because it allows for collision detection and is quite simple at the same time.

This circuit does not allow for collision detection. This galvanically isolated circuit does not require RTS pin control by a software application or driver because it controls the transceiver direction automatically. If set to zero, driver will not use TX buffer, TX function will block task until all data have been sent out.

On success, a new queue handle is written here to provide access to UART events. If set to NULL, driver will not use an event queue. Return true driver is installed. If non-NULL, a handle for the interrupt will be returned here.

The check is performed on a per-pin basis. Internal signal can be output to multiple GPIO pads. Only one GPIO pad can connect with input signal. Note UART must be configured with hardware flow control disabled. Return -1 Parameter error. FTDI keeps updating drivers. To get them, you need to go to the official FTDI website , find the drivers corresponding with your specific flavor of Windows version for example, Windows 64 bit and download the driver manually.

Driver Easy will automatically recognize your system and find the correct drivers for it. But with the Pro version it takes just 2 clicks:. Hopefully this helps. As a technical writer for Driver Easy, April writes articles related to various tech issues, including Windows computer problems and game errors. She's never happier than when her articles help people solve their problems - whether they're Windows errors and blue screens to network errors and faulty hardware.

When she's not writing, she likes reading literary novels and poetry. To install Driver Easy Click. April Cai Last Updated: 9 months ago.