CY8CKIT-030 PSoC® 3 Development Kit Guide, Doc. # 001-61038 Rev. *J
37
Code Examples
5.6
ADC_DAC Example
5.6.1
Project Description
This project demonstrates sine wave generation by using an 8-bit DAC and DMA. The sine wave
period is based on the current value of the ADC value of the potentiometer.
The firmware reads the voltage output by the board potentiometer and displays the raw counts on
the board character LCD display. An 8-bit DAC outputs a table generated sine wave to an LED using
DMA at a frequency proportional to the ADC count.
5.6.2
Hardware Connections
For this example, the character LCD must be installed on P8. The example uses the potentiometer;
therefore, the jumper POT_PWR (J30) should also be in place. This jumper connects the potentiom-
eter to the Vdda.
5.6.3
Verify Output
Build, program the device, and press the
Reset
button on the PSoC 3 Development Kit to see the
ADC output displayed on the LCD. LED4 is an AC signal output whose period is based on the ADC.
Turning the potentiometer results in LCD value change. This also results in change in the period of
the sine wave fed into LED4, which can also be observed.
Figure 5-9. ADC Output
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