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dsPICDEM? 80-Pin Starter Development Board User’s Guide
3.4.2
Analog-to-Digital Conversion
This program consists of two subroutines which (1) perform the A/D conversion and (2)
transmit the converted value over an RS-232 serial connection (see Figure 3-2). The
A/D conversion routine samples the analog output of Potentiometer RB2. The transmit
routine converts the 12-bit binary value from ADC12 to a three-digit HEX code,
converts the HEX code to an ASCII character and loads the ASCII value into the
transmission buffer of UART1. UART1 transmits each ASCII character with a CR and
LF to delimit each sample as a separate line on the receiving terminal.
FIGURE 3-2:
ANALOG-TO-DIGITAL CONVERSION FLOW DIAGRAM
START
INIT ADC12
INIT UART
Delay 10 msec
Start A/D
Conversion
ADC Complete?
No
Yes
Convert 12-bit Binary
to 3-digit HEX
Yes
DS51584B-page 28
Convert HEX
Digit 3 to ASCII
Convert HEX
Digit 2 to ASCII
Convert HEX
Digit 1 to ASCII
Generate ASCII
CR
Generate ASCII
LF
Buffer Full?
Yes
Buffer Full?
Yes
Buffer Full?
Yes
Buffer Full?
Yes
Buffer Full?
No
No
No
No
No
Load Digit 3 into
Transmit Buffer
Load Digit 2 into
Transmit Buffer
Load Digit 1 into
Transmit Buffer
Load CR into
Transmit Buffer
Load Transmit
Buffer
? 2006 Microchip Technology Inc.
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