GroupA / Mbed 2 deprecated Lab_6_WaG

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Dependencies:   mbed

Fork of WaG by GroupA

display.cpp@15:100321eb2aac, 2018-02-27 (annotated)

Committer:
phn10
Date:
Tue Feb 27 17:12:15 2018 +0000
Revision:
15:100321eb2aac
Parent:
14:be27f6e21a8a
Child:
16:dfa9eb1a808d
add function comment description

Who changed what in which revision?

UserRevisionLine numberNew contents of line
phn10 7:161fe3793ddb 1 /******************************************************************************
phn10 7:161fe3793ddb 2 * EECS 397
phn10 7:161fe3793ddb 3 *
phn10 7:161fe3793ddb 4 * Assignment Name: Lab 4: display_test2
phn10 7:161fe3793ddb 5 *
phn10 7:161fe3793ddb 6 * Authors: Sam Morrison and Phong Nguyen
phn10 7:161fe3793ddb 7 * File name: display.cpp
phn10 7:161fe3793ddb 8 * Purpose: Contain function definitions
phn10 7:161fe3793ddb 9 *
phn10 7:161fe3793ddb 10 * Created: 02/21/2018
phn10 15:100321eb2aac 11 * Last Modified: 02/27/2018
phn10 7:161fe3793ddb 12 *
phn10 7:161fe3793ddb 13 ******************************************************************************/
phn10 8:d8bc78bda829 14 #include "mbed.h"
phn10 8:d8bc78bda829 15 #include "io_pins.h"
phn10 8:d8bc78bda829 16 #include "display.h"
phn10 8:d8bc78bda829 17 #include <stdlib.h>
phn10 8:d8bc78bda829 18 #include <stdio.h>
phn10 8:d8bc78bda829 19 #include <string.h>
phn10 8:d8bc78bda829 20
spm71 14:be27f6e21a8a 21 //#define VERSION1
spm71 14:be27f6e21a8a 22 #define VERSION2
spm71 10:ae0a262ba48d 23
phn10 8:d8bc78bda829 24
phn10 8:d8bc78bda829 25 /*
phn10 8:d8bc78bda829 26 * void initial_setup(DigitalOut SS, int data_length, int frequency);
phn10 8:d8bc78bda829 27 * Description: setup spi data length (in bit), spi frequency, set LED
phn10 8:d8bc78bda829 28 * display to normal operation, and set all display numbers
phn10 8:d8bc78bda829 29 * to 0.
phn10 8:d8bc78bda829 30 *
phn10 8:d8bc78bda829 31 * Inputs:
phn10 8:d8bc78bda829 32 * Parameters:
phn10 8:d8bc78bda829 33 * SPI spi: spi object
phn10 8:d8bc78bda829 34 * DigitalOut SS: chip select pin
phn10 8:d8bc78bda829 35 * int data_length: spi data length in bit
phn10 8:d8bc78bda829 36 * int frequency: frequency of SPI communication
phn10 8:d8bc78bda829 37 *
phn10 8:d8bc78bda829 38 * Outputs:
phn10 8:d8bc78bda829 39 * Returns: void
phn10 8:d8bc78bda829 40 */
phn10 8:d8bc78bda829 41 void initial_setup(DigitalOut SS, int data_length, int frequency) {
phn10 8:d8bc78bda829 42 SS = 1;
phn10 8:d8bc78bda829 43 spi.format(data_length, 0);
phn10 8:d8bc78bda829 44 spi.frequency(frequency);
phn10 8:d8bc78bda829 45
phn10 8:d8bc78bda829 46 SS = 0;
phn10 8:d8bc78bda829 47 spi.write(0x0C01); //normal operation
phn10 8:d8bc78bda829 48 SS = 1;
phn10 8:d8bc78bda829 49
phn10 8:d8bc78bda829 50 SS = 0;
phn10 8:d8bc78bda829 51 spi.write(0x090F); //decode to bits 0:3
phn10 8:d8bc78bda829 52 SS = 1;
phn10 8:d8bc78bda829 53
phn10 8:d8bc78bda829 54 SS = 0;
phn10 8:d8bc78bda829 55 spi.write(0x0F00); //set to normal mode
phn10 8:d8bc78bda829 56 SS = 1;
phn10 8:d8bc78bda829 57
phn10 8:d8bc78bda829 58 SS = 0;
phn10 8:d8bc78bda829 59 spi.write(0x0A0F); //intensity set to max
phn10 8:d8bc78bda829 60 SS = 1;
phn10 8:d8bc78bda829 61
phn10 8:d8bc78bda829 62 SS = 0;
phn10 8:d8bc78bda829 63 spi.write(0x0B04); //display digits 0:4
phn10 8:d8bc78bda829 64 SS = 1;
phn10 8:d8bc78bda829 65
phn10 8:d8bc78bda829 66 SS = 0;
phn10 8:d8bc78bda829 67 spi.write(0x0100); //set digit 1 to 0
phn10 8:d8bc78bda829 68 SS = 1;
phn10 8:d8bc78bda829 69
phn10 8:d8bc78bda829 70 SS = 0;
phn10 8:d8bc78bda829 71 spi.write(0x0200); //set digit 2 to 0
phn10 8:d8bc78bda829 72 SS = 1;
phn10 8:d8bc78bda829 73
phn10 8:d8bc78bda829 74 SS = 0;
phn10 8:d8bc78bda829 75 spi.write(0x0300); //set digit 3 to 0
phn10 8:d8bc78bda829 76 SS = 1;
phn10 8:d8bc78bda829 77
phn10 8:d8bc78bda829 78 SS = 0;
phn10 8:d8bc78bda829 79 spi.write(0x0400); //set digit 4 to 0
phn10 8:d8bc78bda829 80 SS = 1;
phn10 8:d8bc78bda829 81
phn10 8:d8bc78bda829 82 SS = 0;
phn10 8:d8bc78bda829 83 spi.write(0x0500); //set digit 5 to 0
phn10 8:d8bc78bda829 84 SS = 1;
phn10 8:d8bc78bda829 85 }
phn10 8:d8bc78bda829 86
spm71 10:ae0a262ba48d 87
spm71 10:ae0a262ba48d 88 #ifdef VERSION1
phn10 8:d8bc78bda829 89 /*
spm71 10:ae0a262ba48d 90 * void bin2bcd_array(int num);
spm71 13:8936b2f64aa2 91 * Description: Converts to BCD array using modulo method.
phn10 8:d8bc78bda829 92 *
phn10 8:d8bc78bda829 93 * Inputs:
phn10 8:d8bc78bda829 94 * Parameters:
spm71 13:8936b2f64aa2 95 * int num: number to push to display
spm71 13:8936b2f64aa2 96 char bcd[]: BCD array that will be written to
phn10 8:d8bc78bda829 97 * Globals:
phn10 8:d8bc78bda829 98 *
phn10 8:d8bc78bda829 99 * Outputs:
phn10 8:d8bc78bda829 100 * Returns: void
phn10 8:d8bc78bda829 101 */
spm71 10:ae0a262ba48d 102 void bin2bcd_array(int num, char bcd[]) {
spm71 13:8936b2f64aa2 103 int place = 0;
phn10 7:161fe3793ddb 104 while (num != 0) { //converts decimal input to decimal array using %mod
phn10 7:161fe3793ddb 105 int val = num % 10;
spm71 12:a947a6609a23 106 bcd[place] = val;
phn10 7:161fe3793ddb 107 num = num/10;
spm71 13:8936b2f64aa2 108 place++;
phn10 7:161fe3793ddb 109 }
phn10 7:161fe3793ddb 110 }
spm71 10:ae0a262ba48d 111 #endif
phn10 7:161fe3793ddb 112
spm71 10:ae0a262ba48d 113 #ifdef VERSION2
phn10 8:d8bc78bda829 114 /*
phn10 9:06c0d5737e5c 115 * void bin2bcd_array(int num);
phn10 9:06c0d5737e5c 116 * Description: converts a number from binary format to binary coded
phn10 9:06c0d5737e5c 117 * decimal array using sprintf() method
phn10 9:06c0d5737e5c 118 *
phn10 9:06c0d5737e5c 119 * Inputs:
phn10 9:06c0d5737e5c 120 * Parameters:
phn10 9:06c0d5737e5c 121 * int num: number in binary format
phn10 15:100321eb2aac 122 * char bcd[]: bcd (binary coded decimal) array
phn10 9:06c0d5737e5c 123 *
phn10 9:06c0d5737e5c 124 * Outputs:
phn10 9:06c0d5737e5c 125 * Returns: void
phn10 9:06c0d5737e5c 126 */
spm71 10:ae0a262ba48d 127 void bin2bcd_array(int num, char bcd[]) {
phn10 9:06c0d5737e5c 128 char tmp_array[4];
phn10 11:6751b9406142 129 char reverse_bcd[4];
phn10 11:6751b9406142 130 int last_index = 0;
phn10 9:06c0d5737e5c 131 int i = 0;
phn10 11:6751b9406142 132
phn10 11:6751b9406142 133 sprintf(tmp_array, "%d", num);
phn10 11:6751b9406142 134 for (i = 0; i < 4; i++) {
phn10 11:6751b9406142 135 bcd[i] = 0;
phn10 11:6751b9406142 136 reverse_bcd[i] = 0;
phn10 11:6751b9406142 137 }
phn10 11:6751b9406142 138
phn10 11:6751b9406142 139 while (last_index < 4 and tmp_array[last_index] != '\0') {
phn10 11:6751b9406142 140 reverse_bcd[last_index] = tmp_array[last_index] - '0';
phn10 11:6751b9406142 141 last_index++;
phn10 11:6751b9406142 142 }
phn10 11:6751b9406142 143
phn10 11:6751b9406142 144 // reverse the order to fit binary coded decimal
phn10 11:6751b9406142 145 for (i = 0; i < last_index; i++) {
phn10 11:6751b9406142 146 bcd[i] = reverse_bcd[last_index - 1 - i];
phn10 9:06c0d5737e5c 147 }
phn10 9:06c0d5737e5c 148 }
spm71 10:ae0a262ba48d 149 #endif
phn10 9:06c0d5737e5c 150
phn10 15:100321eb2aac 151 /*
phn10 15:100321eb2aac 152 * void send_command_to_display(char bcd[]);
phn10 15:100321eb2aac 153 * Description: send bcd[] array to the display driver to display number
phn10 15:100321eb2aac 154 * in the display
phn10 15:100321eb2aac 155 *
phn10 15:100321eb2aac 156 * Inputs:
phn10 15:100321eb2aac 157 * Parameters:
phn10 15:100321eb2aac 158 * char bcd[]: bcd (binary coded decimal) array
phn10 15:100321eb2aac 159 *
phn10 15:100321eb2aac 160 * Outputs:
phn10 15:100321eb2aac 161 * Returns: void
phn10 15:100321eb2aac 162 */
phn10 11:6751b9406142 163 void send_command_to_display(char bcd[]) {
phn10 11:6751b9406142 164 int command;
phn10 11:6751b9406142 165
phn10 11:6751b9406142 166
phn10 11:6751b9406142 167 for (int i = 1; i <= 4; i++) {
phn10 11:6751b9406142 168 command = 0;
phn10 11:6751b9406142 169 // command has following form: 0x0[place]0[value]
phn10 11:6751b9406142 170 // the value converted to int is 16 * 16 * place + value
phn10 11:6751b9406142 171 command = 16 * 16 * i + bcd[i - 1];
phn10 11:6751b9406142 172
phn10 11:6751b9406142 173 SS = 0;
phn10 11:6751b9406142 174 spi.write(command);
phn10 11:6751b9406142 175 SS = 1;
phn10 11:6751b9406142 176 }
phn10 7:161fe3793ddb 177 }