Example 11 Analog-to-Digital Converter

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Example 11Analog-to-Digital Converter

• Lecture L5.1

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miniDragon
2 pushbutton switches
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Method of Successive Approximation
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Method of Successive Approximation
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Example 11
// Example 11 A/D Converter -- Pot include
lthidef.hgt / common defines and macros
/ include ltmc9s12dp256.hgt / derivative
information / include "main_asm.h" / interface
to the assembly module / pragma LINK_INFO
DERIVATIVE "mc9s12dp256b" int val void
main(void) PLL_init() // set system clock
frequency to 24 MHz ad0_enable() //
enable a/d converter 0 lcd_init()
// enable lcd while(1) val ad0conv(7)
// read pot on channel 7 val val gtgt
1 // shift 1 bit right (divide by 2)
set_lcd_addr(0x40) // display on 2nd row of
LCD write_int_lcd(val) // write value in
field of 5 ms_delay(100) // delay 0.1
seconds