DM300019 datasheet(32/50 Pages) MICROCHIP

32 / 50 page

dsPICDEM™ 80-Pin Starter Development Board User’s Guide

DS51584B-page 28

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

INIT ADC12

INIT UART

Start A/D

Conversion

Convert HEX

Digit 3 to ASCII

ADC Complete?

Buffer Full?

Load Digit 3 into

Transmit Buffer

START

Delay 10 msec

Convert 12-bit Binary

to 3-digit HEX

Convert HEX

Digit 2 to ASCII

Buffer Full?

Load Digit 2 into

Transmit Buffer

Convert HEX

Digit 1 to ASCII

Buffer Full?

Load Digit 1 into

Transmit Buffer

Generate ASCII

Buffer Full?

Load CR into

Transmit Buffer

Generate ASCII

Buffer Full?

Load Transmit

Buffer

Yes

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