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Example 5 Pushbutton Switches: S1 and S2

Example 5 Pushbutton Switches: S1 and S2. Lecture L3.1. 2 pushbutton switches. Serial cable. A/D Pot. Run/Load switch. Reset button. 7-segment display. Power plug. I/O headers. miniDragon+. Pushbutton Switches: S1 and S2. (PORTAD0 & 0x10) == 0. TRUE if S1 is closed.

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Example 5 Pushbutton Switches: S1 and S2

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  1. Example 5Pushbutton Switches: S1 and S2 Lecture L3.1

  2. 2 pushbutton switches Serial cable A/D Pot Run/Load switch Reset button 7-segment display Power plug I/O headers miniDragon+

  3. Pushbutton Switches: S1 and S2 (PORTAD0 & 0x10) == 0 TRUE if S1 is closed (PORTAD0 & 0x08) == 0 TRUE if S2 is closed

  4. Example 5a // Example 5a: Pushbutton Switches #include <hidef.h> /* common defines and macros */ #include <mc9s12dp256.h> /* derivative information */ #include "main_asm.h" /* interface to the assembly module */ #pragma LINK_INFO DERIVATIVE "mc9s12dp256b" void main(void) { PLL_init(); // set system clock frequency to 24 MHz seg7_enable(); // enable 7-segment display ATD0DIEN = 0x18; // enable S1 and S2 while(1){ if((PORTAD0 & 0x10) == 0) seg7dec(1); else seg7_off(); if((PORTAD0 & 0x08) == 0) seg7dec(2); else seg7_off(); } }

  5. Example 5b // Example 5b: Pushbutton Switches using C function calls #include <hidef.h> /* common defines and macros */ #include <mc9s12dp256.h> /* derivative information */ #include "main_asm.h" /* interface to the assembly module */ #pragma LINK_INFO DERIVATIVE "mc9s12dp256b" void main(void) { PLL_init(); // set system clock frequency to 24 MHz seg7_enable(); // enable 7-segment display SW12_enable(); // enable S1 and S2 while(1){ if(SW1_down()) seg7dec(1); else seg7_off(); if(SW2_down()) seg7dec(2); else seg7_off(); } }

  6. Example 5

  7. Example 5c // Example 5c: Pushbutton Switches - Problem 5.3 #include <hidef.h> /* common defines and macros */ #include <mc9s12dp256.h> /* derivative information */ #include "main_asm.h" /* interface to the assembly module */ #pragma LINK_INFO DERIVATIVE "mc9s12dp256b" void main(void) { PLL_init(); // set system clock frequency to 24 MHz seg7_enable(); // enable 7-segment display SW12_enable(); // enable S1 and S2 while(1){ while(SW1_down()){ seg7dec(1); } seg7_off(); while(SW2_down()){ seg7dec(2); } seg7_off(); } }

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