display.c - tdse-tp3_02-code

app/src/display.c (6449B)
Line numbers
   1 #include "display.h"
   2 #include "main.h"
   3 #include <stdbool.h>
   4 
   5 // Demo includes
   6 #include "logger.h"
   7 #include "dwt.h"
   8 #include "systick.h"
   9 
  10 // Functional states
  11 #ifndef OFF
  12 #define OFF    0
  13 #endif
  14 #ifndef ON
  15 #define ON     ( !OFF )
  16 #endif
  17 
  18 // Electrical states
  19 #ifndef LOW
  20 #define LOW    0
  21 #endif
  22 #ifndef HIGH
  23 #define HIGH   ( !LOW )
  24 #endif
  25 
  26 #define DISPLAY_IR_CLEAR_DISPLAY   0b00000001
  27 #define DISPLAY_IR_ENTRY_MODE_SET  0b00000100
  28 #define DISPLAY_IR_DISPLAY_CONTROL 0b00001000
  29 #define DISPLAY_IR_FUNCTION_SET    0b00100000
  30 #define DISPLAY_IR_SET_DDRAM_ADDR  0b10000000
  31 
  32 #define DISPLAY_IR_ENTRY_MODE_SET_INCREMENT 0b00000010
  33 #define DISPLAY_IR_ENTRY_MODE_SET_DECREMENT 0b00000000
  34 #define DISPLAY_IR_ENTRY_MODE_SET_SHIFT     0b00000001
  35 #define DISPLAY_IR_ENTRY_MODE_SET_NO_SHIFT  0b00000000
  36 
  37 #define DISPLAY_IR_DISPLAY_CONTROL_DISPLAY_ON  0b00000100
  38 #define DISPLAY_IR_DISPLAY_CONTROL_DISPLAY_OFF 0b00000000
  39 #define DISPLAY_IR_DISPLAY_CONTROL_CURSOR_ON   0b00000010
  40 #define DISPLAY_IR_DISPLAY_CONTROL_CURSOR_OFF  0b00000000
  41 #define DISPLAY_IR_DISPLAY_CONTROL_BLINK_ON    0b00000001
  42 #define DISPLAY_IR_DISPLAY_CONTROL_BLINK_OFF   0b00000000
  43 
  44 #define DISPLAY_IR_FUNCTION_SET_8BITS    0b00010000
  45 #define DISPLAY_IR_FUNCTION_SET_4BITS    0b00000000
  46 #define DISPLAY_IR_FUNCTION_SET_2LINES   0b00001000
  47 #define DISPLAY_IR_FUNCTION_SET_1LINE    0b00000000
  48 #define DISPLAY_IR_FUNCTION_SET_5x10DOTS 0b00000100
  49 #define DISPLAY_IR_FUNCTION_SET_5x8DOTS  0b00000000
  50 
  51 #define DISPLAY_20x4_LINE1_FIRST_CHARACTER_ADDRESS 0
  52 #define DISPLAY_20x4_LINE2_FIRST_CHARACTER_ADDRESS 64
  53 #define DISPLAY_20x4_LINE3_FIRST_CHARACTER_ADDRESS 20
  54 #define DISPLAY_20x4_LINE4_FIRST_CHARACTER_ADDRESS 84
  55 
  56 #define DISPLAY_RS_INSTRUCTION 0
  57 #define DISPLAY_RS_DATA        1
  58 
  59 #define DISPLAY_RW_WRITE 0
  60 #define DISPLAY_RW_READ  1
  61 
  62 #define DISPLAY_PIN_RS 8
  63 #define DISPLAY_PIN_EN 9
  64 #define DISPLAY_PIN_D4 4
  65 #define DISPLAY_PIN_D5 5
  66 #define DISPLAY_PIN_D6 6
  67 #define DISPLAY_PIN_D7 7
  68 
  69 #define DISPLAY_DEL_37US 37ul
  70 #define DISPLAY_DEL_01US 01ul
  71 
  72 // declaration of private functions
  73 static void display_pin_write(uint8_t pin_name, int value);
  74 static void display_data_bus_write(uint8_t data_byte);
  75 static void display_code_write(bool type, uint8_t data_bus);
  76 
  77 // public functions
  78 
  79 void display_init(void)
  80 {
  81     display_code_write(DISPLAY_RS_INSTRUCTION,
  82             DISPLAY_IR_FUNCTION_SET |
  83             DISPLAY_IR_FUNCTION_SET_4BITS |
  84             DISPLAY_IR_FUNCTION_SET_2LINES |
  85             DISPLAY_IR_FUNCTION_SET_5x8DOTS);
  86 
  87     display_code_write(DISPLAY_RS_INSTRUCTION,
  88             DISPLAY_IR_CLEAR_DISPLAY);
  89 
  90     display_code_write(DISPLAY_RS_INSTRUCTION,
  91             DISPLAY_IR_ENTRY_MODE_SET |
  92             DISPLAY_IR_ENTRY_MODE_SET_INCREMENT |
  93             DISPLAY_IR_ENTRY_MODE_SET_NO_SHIFT);
  94 
  95     display_code_write(DISPLAY_RS_INSTRUCTION,
  96             DISPLAY_IR_DISPLAY_CONTROL |
  97             DISPLAY_IR_DISPLAY_CONTROL_DISPLAY_ON |
  98             DISPLAY_IR_DISPLAY_CONTROL_CURSOR_ON |
  99             DISPLAY_IR_DISPLAY_CONTROL_BLINK_ON);
 100 
 101 }
 102 
 103 void display_char_position_write(uint8_t x, uint8_t y)
 104 {
 105     switch(x) 
 106     {
 107         case 0:
 108             display_code_write(DISPLAY_RS_INSTRUCTION,
 109                     DISPLAY_IR_SET_DDRAM_ADDR |
 110                     (DISPLAY_20x4_LINE1_FIRST_CHARACTER_ADDRESS + x));
 111         break;
 112 
 113         case 1:
 114         display_code_write(DISPLAY_RS_INSTRUCTION,
 115                 DISPLAY_IR_SET_DDRAM_ADDR |
 116                 (DISPLAY_20x4_LINE2_FIRST_CHARACTER_ADDRESS + x));
 117         break;
 118 
 119         case 2:
 120         display_code_write(DISPLAY_RS_INSTRUCTION,
 121                 DISPLAY_IR_SET_DDRAM_ADDR |
 122                 (DISPLAY_20x4_LINE3_FIRST_CHARACTER_ADDRESS + x));
 123         break;
 124 
 125         case 3:
 126         display_code_write(DISPLAY_RS_INSTRUCTION,
 127                 DISPLAY_IR_SET_DDRAM_ADDR |
 128                 (DISPLAY_20x4_LINE4_FIRST_CHARACTER_ADDRESS + x));
 129         break;
 130         default: break;
 131     }
 132 }
 133 
 134 void display_string_write(const char * str)
 135 {
 136     while (*str) {
 137         display_code_write(DISPLAY_RS_DATA, *str++);
 138     }
 139 }
 140 
 141 void display_cursor_off(void)
 142 {
 143     display_code_write(DISPLAY_RS_INSTRUCTION,
 144             DISPLAY_IR_DISPLAY_CONTROL |
 145             DISPLAY_IR_DISPLAY_CONTROL_DISPLAY_ON |
 146             DISPLAY_IR_DISPLAY_CONTROL_CURSOR_OFF |
 147             DISPLAY_IR_DISPLAY_CONTROL_BLINK_OFF);
 148 }
 149 
 150 void display_cursor_on(void)
 151 {
 152     display_code_write(DISPLAY_RS_INSTRUCTION,
 153             DISPLAY_IR_DISPLAY_CONTROL |
 154             DISPLAY_IR_DISPLAY_CONTROL_DISPLAY_ON |
 155             DISPLAY_IR_DISPLAY_CONTROL_CURSOR_ON |
 156             DISPLAY_IR_DISPLAY_CONTROL_BLINK_ON);
 157 }
 158 
 159 // private functions
 160 
 161 static void display_code_write( bool type, uint8_t data_bus )
 162 {
 163     if (type == DISPLAY_RS_INSTRUCTION) {
 164         display_pin_write( DISPLAY_PIN_RS, DISPLAY_RS_INSTRUCTION );
 165     }
 166     else {
 167         display_pin_write(DISPLAY_PIN_RS, DISPLAY_RS_DATA);
 168     }
 169 
 170     display_data_bus_write(data_bus);
 171 }
 172 
 173 static void display_pin_write(uint8_t pin_name, int value)
 174 {
 175     switch(pin_name)
 176     {
 177         case DISPLAY_PIN_D4:
 178             HAL_GPIO_WritePin(D4_GPIO_Port, D4_Pin, value);
 179         break;
 180         case DISPLAY_PIN_D5:
 181             HAL_GPIO_WritePin(D5_GPIO_Port, D5_Pin, value);
 182         break;
 183         case DISPLAY_PIN_D6:
 184             HAL_GPIO_WritePin(D6_GPIO_Port, D6_Pin, value);
 185         break;
 186         case DISPLAY_PIN_D7:
 187             HAL_GPIO_WritePin(D7_GPIO_Port, D7_Pin, value);
 188         break;
 189         case DISPLAY_PIN_RS:
 190             HAL_GPIO_WritePin(D8_GPIO_Port, D8_Pin, value);
 191         break;
 192         case DISPLAY_PIN_EN:
 193             HAL_GPIO_WritePin(D9_GPIO_Port, D9_Pin, value);
 194         break;
 195         default: break;
 196     }
 197 }
 198 
 199 static void display_data_bus_write( uint8_t data_bus )
 200 {
 201     display_pin_write( DISPLAY_PIN_EN, OFF );
 202     display_pin_write( DISPLAY_PIN_D7, data_bus & 0b10000000 );
 203     display_pin_write( DISPLAY_PIN_D6, data_bus & 0b01000000 );
 204     display_pin_write( DISPLAY_PIN_D5, data_bus & 0b00100000 );
 205     display_pin_write( DISPLAY_PIN_D4, data_bus & 0b00010000 );
 206 
 207     display_pin_write( DISPLAY_PIN_EN, ON );
 208     display_pin_write( DISPLAY_PIN_EN, OFF );
 209     display_pin_write( DISPLAY_PIN_D7, data_bus & 0b00001000 );
 210     display_pin_write( DISPLAY_PIN_D6, data_bus & 0b00000100 );
 211     display_pin_write( DISPLAY_PIN_D5, data_bus & 0b00000010 );
 212     display_pin_write( DISPLAY_PIN_D4, data_bus & 0b00000001 );
 213 
 214     display_pin_write( DISPLAY_PIN_EN, ON );
 215     display_pin_write( DISPLAY_PIN_EN, OFF );
 216     HAL_Delay(1);
 217 }
tdse-tp3_02-code_integration
