Tim Johnson / Mbed 2 deprecated Controlling_GPIO_pinouts

How to control an output pin...and how to find out what the compiler name for the pin is.

Dependencies:   mbed

main.cpp@1:0e26c8d5e834, 2016-08-16 (annotated)

Committer:
captaintim
Date:
Tue Aug 16 20:25:31 2016 +0000
Revision:
1:0e26c8d5e834
Parent:
0:e3b48fea2164
Child:
2:afd0cb53867f
Child:
3:9affc00dfa25
Modified Controlling_GPIO_pinouts to demo sample program using DigitalOut command to test LED segments on 4-digits 7-segment LED display, using mbed LPC1768 and Lumex LDQ-N514R1 LED display

Who changed what in which revision?

UserRevisionLine numberNew contents of line
captaintim 0:e3b48fea2164 1 #include "mbed.h"
captaintim 0:e3b48fea2164 2
captaintim 1:0e26c8d5e834 3 /*comments: testing turning on and off of Pins for 7-segment diode
captaintim 0:e3b48fea2164 4 using https://developer.mbed.org/users/synvox/notebook/lpc1768-pinout-with-labelled-mbed-pins/
captaintim 1:0e26c8d5e834 5 by Nenad Milosevic
captaintim 0:e3b48fea2164 6 verification: put the black lead of a multimeter on pin 1 (gnd)
captaintim 0:e3b48fea2164 7 and put the red lead on pin 26, voltage varies between +3.28VDC and 0VDC */
captaintim 0:e3b48fea2164 8
captaintim 1:0e26c8d5e834 9 /*test program to learn how to write code for a 4 digit, 7-segment LED display LDQ-N524R1
captaintim 1:0e26c8d5e834 10 The schematic for this (COMMON CATHODE) display shows the following connections
captaintim 1:0e26c8d5e834 11 schematic located at http://www.lumex.com/ldq-n514ri (open Specs PDF for drawing)
captaintim 1:0e26c8d5e834 12
captaintim 1:0e26c8d5e834 13 Pin Out wiring guide:(connect these mbed pins to display)
captaintim 1:0e26c8d5e834 14
captaintim 1:0e26c8d5e834 15 CONTROL DISPLAY Pin# MBED Pin#
captaintim 1:0e26c8d5e834 16 ----------------------------------
captaintim 1:0e26c8d5e834 17 Digit1 12 14
captaintim 1:0e26c8d5e834 18 Digit2 9 13
captaintim 1:0e26c8d5e834 19 Digit3 8 12
captaintim 1:0e26c8d5e834 20 Digit4 6 11
captaintim 1:0e26c8d5e834 21 DP 3 10
captaintim 1:0e26c8d5e834 22 A 11 21
captaintim 1:0e26c8d5e834 23 B 7 22
captaintim 1:0e26c8d5e834 24 C 4 23
captaintim 1:0e26c8d5e834 25 D 2 24
captaintim 1:0e26c8d5e834 26 E 1 25
captaintim 1:0e26c8d5e834 27 F 5 26
captaintim 1:0e26c8d5e834 28 G 5 27
captaintim 1:0e26c8d5e834 29
captaintim 1:0e26c8d5e834 30 There is no blanking on this display,
captaintim 1:0e26c8d5e834 31 you have to write a ONE to Gnd pin for specific digit to turn it off
captaintim 1:0e26c8d5e834 32 Program demonstrates use of DigitalOut to control segments of 7 segment display for 4 digit display LDQ-N514R1
captaintim 1:0e26c8d5e834 33 Author: Cap'n Tim Johnson PE
captaintim 1:0e26c8d5e834 34 Retired Professor
captaintim 1:0e26c8d5e834 35 Wentworth Institude of Technology
captaintim 1:0e26c8d5e834 36 Dept. Electrical Engineering and Technology
captaintim 1:0e26c8d5e834 37 Boston, MA
captaintim 1:0e26c8d5e834 38 */
captaintim 1:0e26c8d5e834 39
captaintim 1:0e26c8d5e834 40
captaintim 1:0e26c8d5e834 41 DigitalOut myled(LED1); //used to signal where in the program "thou art".
captaintim 0:e3b48fea2164 42
captaintim 0:e3b48fea2164 43 int main() {
captaintim 1:0e26c8d5e834 44 //int on = 1;
captaintim 1:0e26c8d5e834 45 //int off = 0;
captaintim 1:0e26c8d5e834 46 int i = 2; //wait time interval
captaintim 1:0e26c8d5e834 47
captaintim 1:0e26c8d5e834 48 //test of LED 7-segment diodes on 4 digit display
captaintim 1:0e26c8d5e834 49 //while(1){
captaintim 1:0e26c8d5e834 50 DigitalOut (p14, 0); //Turn on digit1, Most Significant Digit
captaintim 1:0e26c8d5e834 51 DigitalOut (p21, 1);
captaintim 1:0e26c8d5e834 52 DigitalOut (p22, 1);
captaintim 1:0e26c8d5e834 53 DigitalOut (p23, 1);
captaintim 1:0e26c8d5e834 54 DigitalOut (p24, 1);
captaintim 1:0e26c8d5e834 55 DigitalOut (p25, 1);
captaintim 1:0e26c8d5e834 56 DigitalOut (p26, 1);
captaintim 1:0e26c8d5e834 57 DigitalOut (p27, 1);
captaintim 1:0e26c8d5e834 58 DigitalOut (p10, 1); //decimal point
captaintim 1:0e26c8d5e834 59 wait (i);
captaintim 1:0e26c8d5e834 60
captaintim 1:0e26c8d5e834 61 DigitalOut (p14, 1); //turn off digit1
captaintim 1:0e26c8d5e834 62 DigitalOut (p13, 0); //turn on digit2
captaintim 1:0e26c8d5e834 63 DigitalOut (p21, 1);
captaintim 1:0e26c8d5e834 64 DigitalOut (p22, 1);
captaintim 1:0e26c8d5e834 65 DigitalOut (p23, 1);
captaintim 1:0e26c8d5e834 66 DigitalOut (p24, 1);
captaintim 1:0e26c8d5e834 67 DigitalOut (p25, 1);
captaintim 1:0e26c8d5e834 68 DigitalOut (p26, 1);
captaintim 1:0e26c8d5e834 69 DigitalOut (p27, 1);
captaintim 1:0e26c8d5e834 70 DigitalOut (p10, 1); //decimal point
captaintim 1:0e26c8d5e834 71 wait (i);
captaintim 1:0e26c8d5e834 72
captaintim 1:0e26c8d5e834 73 DigitalOut (p13, 1); //turn off digit2
captaintim 1:0e26c8d5e834 74 DigitalOut (p12, 0); //turn on digit3
captaintim 1:0e26c8d5e834 75 DigitalOut (p21, 1);
captaintim 1:0e26c8d5e834 76 DigitalOut (p22, 1);
captaintim 1:0e26c8d5e834 77 DigitalOut (p23, 1);
captaintim 1:0e26c8d5e834 78 DigitalOut (p24, 1);
captaintim 1:0e26c8d5e834 79 DigitalOut (p25, 1);
captaintim 1:0e26c8d5e834 80 DigitalOut (p26, 1);
captaintim 1:0e26c8d5e834 81 DigitalOut (p27, 1);
captaintim 1:0e26c8d5e834 82 DigitalOut (p10, 1); //decimal point
captaintim 1:0e26c8d5e834 83 wait (i);
captaintim 1:0e26c8d5e834 84
captaintim 1:0e26c8d5e834 85 DigitalOut (p12, 1); //turn off digit3
captaintim 1:0e26c8d5e834 86 DigitalOut (p11, 0); //turn on digit4, Least Significant Digit
captaintim 1:0e26c8d5e834 87 DigitalOut (p21, 1);
captaintim 1:0e26c8d5e834 88 DigitalOut (p22, 1);
captaintim 1:0e26c8d5e834 89 DigitalOut (p23, 1);
captaintim 1:0e26c8d5e834 90 DigitalOut (p24, 1);
captaintim 1:0e26c8d5e834 91 DigitalOut (p25, 1);
captaintim 1:0e26c8d5e834 92 DigitalOut (p26, 1);
captaintim 1:0e26c8d5e834 93 DigitalOut (p27, 1);
captaintim 1:0e26c8d5e834 94 DigitalOut (p10, 1); //decimal point
captaintim 1:0e26c8d5e834 95 wait (i);
captaintim 1:0e26c8d5e834 96 DigitalOut (p11, 1); //Turn off digit4
captaintim 1:0e26c8d5e834 97 //they are all off
captaintim 1:0e26c8d5e834 98 wait (1);
captaintim 0:e3b48fea2164 99
captaintim 1:0e26c8d5e834 100 myled=1; //Signals all are about to turn on
captaintim 1:0e26c8d5e834 101 wait (1);
captaintim 1:0e26c8d5e834 102
captaintim 1:0e26c8d5e834 103 DigitalOut (p14, 0); //Turn them all on
captaintim 1:0e26c8d5e834 104 DigitalOut (p13, 0);
captaintim 1:0e26c8d5e834 105 DigitalOut (p12, 0);
captaintim 1:0e26c8d5e834 106 DigitalOut (p11, 0);
captaintim 1:0e26c8d5e834 107 wait (i);
captaintim 1:0e26c8d5e834 108
captaintim 1:0e26c8d5e834 109 DigitalOut (p14, 1); //Turn them all off
captaintim 1:0e26c8d5e834 110 DigitalOut (p13, 1);
captaintim 1:0e26c8d5e834 111 DigitalOut (p12, 1);
captaintim 1:0e26c8d5e834 112 DigitalOut (p11, 1);
captaintim 1:0e26c8d5e834 113 wait (1);
captaintim 1:0e26c8d5e834 114
captaintim 1:0e26c8d5e834 115 DigitalOut (p14, 0); //Turn them all on as zeros
captaintim 1:0e26c8d5e834 116 DigitalOut (p13, 0);
captaintim 1:0e26c8d5e834 117 DigitalOut (p12, 0);
captaintim 1:0e26c8d5e834 118 DigitalOut (p11, 0);
captaintim 1:0e26c8d5e834 119 DigitalOut (p27, 0);
captaintim 0:e3b48fea2164 120 wait (i);
captaintim 1:0e26c8d5e834 121
captaintim 1:0e26c8d5e834 122 DigitalOut (p14, 1); //Turn them all off
captaintim 1:0e26c8d5e834 123 DigitalOut (p13, 1);
captaintim 1:0e26c8d5e834 124 DigitalOut (p12, 1);
captaintim 1:0e26c8d5e834 125 DigitalOut (p11, 1);
captaintim 1:0e26c8d5e834 126 wait (1);
captaintim 1:0e26c8d5e834 127
captaintim 1:0e26c8d5e834 128 DigitalOut (p14, 0); //Turn them all on as sevens
captaintim 1:0e26c8d5e834 129 DigitalOut (p13, 0);
captaintim 1:0e26c8d5e834 130 DigitalOut (p12, 0);
captaintim 1:0e26c8d5e834 131 DigitalOut (p11, 0);
captaintim 1:0e26c8d5e834 132 DigitalOut (p24, 0);
captaintim 1:0e26c8d5e834 133 DigitalOut (p25, 0);
captaintim 1:0e26c8d5e834 134 DigitalOut (p26, 0);
captaintim 1:0e26c8d5e834 135 DigitalOut (p27, 0);
captaintim 0:e3b48fea2164 136 wait (i);
captaintim 1:0e26c8d5e834 137
captaintim 1:0e26c8d5e834 138 DigitalOut (p14, 1); //Turn them all off
captaintim 1:0e26c8d5e834 139 DigitalOut (p13, 1);
captaintim 1:0e26c8d5e834 140 DigitalOut (p12, 1);
captaintim 1:0e26c8d5e834 141 DigitalOut (p11, 1);
captaintim 1:0e26c8d5e834 142 wait (1);
captaintim 1:0e26c8d5e834 143
captaintim 1:0e26c8d5e834 144 myled=0; //end of program signal
captaintim 1:0e26c8d5e834 145
captaintim 0:e3b48fea2164 146 }