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Dependencies:   mbed

main.cpp@1:158078765a61, 2015-01-07 (annotated)

Committer:
edumana
Date:
Wed Jan 07 16:52:00 2015 +0000
Revision:
1:158078765a61
Parent:
0:9a1865214ee0 
This program toggles the green and red LEDs of the FRDM K22F at the register level.

Who changed what in which revision?

UserRevisionLine numberNew contents of line
edumana 1:158078765a61 1 /*
edumana 1:158078765a61 2 * This program toggles the green and red LEDs of the FRDM K22F Board
edumana 1:158078765a61 3 * at the register level. Refer to the MK22FN512VLH12 datasheet
edumana 1:158078765a61 4 * to understand the registers.
edumana 1:158078765a61 5 *
edumana 1:158078765a61 6 * At the general level:
edumana 1:158078765a61 7 * Sets PTA1 and PTA2 which LEDs are connected to GPIO mode.
edumana 1:158078765a61 8 * Sets both pins to be digital output.
edumana 1:158078765a61 9 * Turns red LED off by writing a 1 and leaves green on.
edumana 1:158078765a61 10 * Enters a loop which uses the Toggle Output Register to turn
edumana 1:158078765a61 11 * LEDs on and off.
edumana 1:158078765a61 12 */
edumana 0:9a1865214ee0 13 #include "mbed.h"
edumana 0:9a1865214ee0 14 Serial pc(USBTX, USBRX);
edumana 0:9a1865214ee0 15 void pr(volatile uint32_t *reg);
edumana 0:9a1865214ee0 16
edumana 0:9a1865214ee0 17 int main(){
edumana 0:9a1865214ee0 18
edumana 1:158078765a61 19 PORTA_PCR1 = 0x143; //Sets pin to GPIO mode
edumana 1:158078765a61 20 PORTA_PCR2 = 0x143; //Sets pin to GPIO mode
edumana 0:9a1865214ee0 21 GPIOA_PDDR = 0x6; //Sets pin to output
edumana 0:9a1865214ee0 22 GPIOA_PSOR = 0x2; //Turns RED off, Leaves GREEN on
edumana 0:9a1865214ee0 23
edumana 0:9a1865214ee0 24 while (1){
edumana 0:9a1865214ee0 25 int volatile counter = 0;
edumana 0:9a1865214ee0 26 while(counter < 10000000){
edumana 0:9a1865214ee0 27 counter++;
edumana 0:9a1865214ee0 28 }
edumana 1:158078765a61 29 GPIOA_PTOR = 0x6; //Toggles RED and GREEN LEDs
edumana 0:9a1865214ee0 30 }
edumana 0:9a1865214ee0 31 }
edumana 1:158078765a61 32 //Debuggin tool, it prints register [address]--> [contents]
edumana 1:158078765a61 33 //Pass the "address of" a register, i.e: pr(&PORTA_PCR1)
edumana 0:9a1865214ee0 34 void pr(volatile uint32_t *reg){
edumana 0:9a1865214ee0 35 pc.printf("%x --> %x \n", reg, *reg);
edumana 0:9a1865214ee0 36 }