参数资料
| 型号： | DM300014 |
| 厂商： | Microchip Technology |
| 文件页数： | 32/72页 |
| 文件大小： | 0K |
| 描述： | BOARD DEMO DSPICDEM 1.1 GEN PURP |
| 标准包装： | 1 |
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dsPICDEM? 1.1 Development Board User’s Guide
FIGURE 3-2:
DEMO MENU OPTIONS
M ENU O PTIONS
D ATA A CQ D ISPLAY
DSP O PERATIONS
DTMF G ENERATION
– S2
– S3
– S4
From this menu you can choose one of three demonstration modes:
? Data Acquisition Display mode
? Digital Signal Processing (DSP) Operations mode
? Dual Tone Multi-Frequency (DTMF) Generation mode
3.3.1.1
DATA ACQUISITION DISPLAY MODE
The Data Acquisition Display mode demonstrates the capability of the dsPIC30F
device to convert inputs from five different analog signal sources at varying sampling
rates.
Data Acquisition mode is initiated by pressing switch SW2. Figure 3-3 shows the
resulting display on the LCD.
FIGURE 3-3:
DATA ACQUISITION DISPLAY
F = 1000 HZ
RP1 = 1.67 V
T EMP = +23 DG C
RP2 = 2.95 V
RP3 = 2.62 V
MAIN – s1
This display shows the values of the following analog signal sources:
? Potentiometers RP1-RP3
The three potentiometers available on the dsPICDEM 1.1 Development Board,
RP1, RP2 and RP3, are connected to analog input pins AN6, AN4 and AN5,
respectively, on the dsPIC30F device.
? Temperature Sensor U2:
Temperature sensor, TC1047A, is connected to the analog input pin, AN8, on the
dsPIC30F device.
? Frequency:
A fundamental sinewave signal is generated by stepping the MCP41010 digital
potentiometer (U9) output at an 8 kHz rate. The analyzed frequency is displayed
on the LCD.
The 12-bit A/D converter on the dsPIC30F device is used to convert these analog input
sources.
To estimate the frequency of the generated sine-wave signal, the program converts and
buffers 256 samples of the signal on pin AN3 and then performs a Fast-Fourier
Transform (FFT) on the buffer. The A/D converter is interrupt driven to sample and
convert at an 8 kHz rate for this operation.
The program scans input pins AN4, AN5, AN6 and AN8 to sample and convert the
values of the temperature sensor and potentiometer signals and delivers one sample
of each of these signals to the LCD display.
DS70099B-page 28
Advance Information
? 2003 Microchip Technology Inc.
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