FIFO Write

Write simple data streams

• Library:

• Simulink Real-Time / RS232

• 

Description

The FIFO Write block is the write side of a FIFO read/write pair. Use this block to generate simple data streams.

Ports

Input

D — Data to write to FIFO

vector

Vector containing the data to write to the FIFO.

Dependency

To determine the data type of this vector, set the parameter Input vector type.

Data Types: int8 | uint8 | int16 | uint16 | int32 | uint32

Output

F — FIFO vector

serialfifoptr

Connects to the FIFO that writes data to the serial port.

DP — True if new data is present in the FIFO

true | false

If data is present in the FIFO, returns true.

Dependency

To make this port visible, set parameters Max and Min read size ports and Enable passthrough.

Parameters

Size — Size of FIFO, in bytes

1024 (default) | integer

Enter the number of elements that can be held in the FIFO at one time. If a write operation to the FIFO causes the number of elements to exceed Size, an error occurs.

Programmatic Use

Block Parameter: size

Input vector type — Specify input data type

8 bit uint null terminated (default) | count+32 bit int | count+32 bit uint | count+16 bit int | count+16 bit uint | 8 bit int null terminated

For the 16-bit and 32-bit data types, include as first element the number of elements to expect in the rest of the input vector. The count controls how many bytes that the block copies into the FIFO. The block does not copy the count itself into the FIFO.

For the 8-bit data types, provide a NULL-terminated character vector in the output vector. The block copies data into the FIFO up to, but not including, the NULL terminator.

For more information, see RS-232 Legacy Drivers.

Programmatic Use

Block Parameter: inputtype

Data present output — Enables output DP

off (default) | on

Select this check box to create the Boolean output DP. If data is present in the FIFO, DP becomes true. The transmit side of the send/receive subsystem uses this output. This output is given to the Enable TX block, which enables the transmitter buffer empty interrupt.

This setting makes the output port DP visible.

Programmatic Use

Block Parameter: present

Sample time — Sample time of block

-1 (default) | numeric

Enter the base sample time or a multiple of the base sample time. -1 means that sample time is inherited.

Programmatic Use

sampletime

ID — Identifier for overflow messages

character vector

Enter a user-defined identifier for FIFO overflow messages.

Programmatic Use

Block Parameter: id

Model Examples

ASCII Encoding/Decoding Loopback Test

Send ASCII data over a serial link.

Open Script

ASCII Encoding/Decoding Resync Loopback Test

Use the ability of the FIFO Read HDRS block to resynchronize after being repeatedly disabled and apply this ability to resolve errors such as when a message is only partially complete at the time the read is attempted.

Open Script

Binary Encoding/Decoding Loopback Test

Send Binary data over a serial link.

Open Script

Binary Encoding/Decoding Resync Loopback Test

Use the ability of the FIFO Read BINARY block to handle messages that are interrupted and only partially complete.

Open Script

Simple ASCII Encoding/Decoding Loopback Test (with Baseboard Blocks)

Convert a single floating point number to ASCII and transmit the value over a serial link.

Open Script

ASCII Encoding/Decoding Loopback Test (with Baseboard Blocks)

Send ASCII data over a serial link.

Open Script

ASCII Encoding/Decoding Resync Loopback Test (with Baseboard Blocks)

Use the ability of the FIFO Read HDRS block to resynchronize after being repeatedly disabled and apply this ability to resolve errors such as when a message is only partially complete at the time the read is attempted.

Open Script

Binary Encoding/Decoding Loopback Test (with Baseboard Blocks)

Send Binary data over a serial link.

Open Script

Binary Encoding/Decoding Resync Loopback Test (with Baseboard Blocks)

Use the ability of the FIFO Read BINARY block to handle messages that are interrupted and only partially complete.

Open Script

Extended Capabilities

C/C++ Code Generation
Generate C and C++ code using Simulink® Coder™.

Version History

Introduced in R2020b