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CY3240 USB-I2C Bridge Guide, Doc. # 001-66660 Rev.*B 53

Code Examples

8. The first two lines in the demo.iic file show how to control the LEDs on the board. Position the

cursor in the first line and press [Enter] to send the command. Repeat for the second command

line. Observe that, on sending the first command, the LED1 turns off. The second command

reduces the LED intensity by 50%, as shown in Figure 5-37.

9. Vary the Intensity value in the eighth byte (hex) value of first and second command lines of the

Bridge Control Panel from 00-FF; observe the change in LED intensity on the demo board.

10.Click in the last line, which reads temperature and light data from the device. Click Repeat to

send the last command repeatedly.

11.Click the Chart tab to view the data graphically, as shown in Figure 5-38.

Figure 5-38. Bridge Control Panel with Plot of Temperature and Light Values

12.The ADC value analogous to the die temperature and light intensity incident on the board are

plotted on the Y-axis of the graph versus the sample number on the X-axis of the graph.

13.Save and close the project.

5.2 USBtoIIC Code Example

5.2.1 Project Description

This project demonstrates communication between the bridge and the host. After each packet is

received by the bridge, an acknowledgement is sent to the host before the next transfer operation

begins.

This project uses the following modules:

CMPRG: Used to compare the data programmable reference threshold.

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Cypress Semiconductor CY8C24894 Bedienungsanleitung Seite 53