EV8000 datasheet(28/35 Pages) CMLMICRO

28 / 35 page

Evaluation Kit User Manual for FX828 and FX829

EV8000

UM8000/4

Warning: Prolonged window resizing or similar background activities may cause

application warnings or even fatal errors whilst receiving continuous FFSK

messages with small inter-message delays.

1.6.3.23 FFSK Tx Message

Select FFSKTX, TXIDLEM and TXDATAM by clicking on their respective checkboxes and then

click on the Update button. If required, other control bits can be set before Update button is

clicked i.e. baud rate etc.

The user should then enter the number of data bytes to be transmitted in a single message using

the Tx message bytes edit box (2-9). The number of preamble bytes should be entered into the

preamble bytes edit box (2-15). The user has the option of adding a 2-byte checksum to the

message. This can be achieved by checking the Tx Checksum checkbox.

The FFSK Tx message form setup can be stored in memory at any stage by clicking on the

Update button. To transfer the data to the

µC board and therefore transmit the FFSK message,

the user should click on the Tx Message Start button.

A checkbox is provided to allow the user to continuously transmit the same FFSK message.

When this checkbox has been checked the user has the option of re-transmitting the 2-byte

synchronisation code. When the Re-Transmit Sync checkbox is checked an inter-message delay

can be specified. The minimum message delay is 100ms, although a value of 0 can be entered to

indicate that no delay is required.

In continuous Tx mode the transmission can be stopped by clicking on the Continuous Tx Stop

button. To indicate that a continuous FFSK transmission is in progress the Tx Message Start

button is disabled until the Continuous Tx Stop button is clicked by the user. Likewise when the

Continuous Tx checkbox is unchecked the Re-Transmit Sync checkbox and Message Delay edit

box are disabled.

Note:

The timer used for the inter-message delay has been implemented in the Windows software.

Therefore, the delay may vary depending on PC performance and other background tasks

running. Whilst operating in continuous FFSK Tx mode with an inter-message delay, it is

recommended that the user disables the Windows Screen Saver and does not attempt any

window resizing, etc.

In continuous FFSK transmit mode with an inter-message delay specified, the delay entered by

the user is the time difference between the end of a message and the start of the next message.

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