Ciro Edgardo Romero
Sistema de supervision y alarma para deposito de comida de animales
Diff: modules/display/display.cpp
- Revision:
- 0:5e7248732177
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/modules/display/display.cpp Fri May 14 17:27:28 2021 +0000
@@ -0,0 +1,357 @@
+//=====[Libraries]=============================================================
+
+#include "mbed.h"
+#include "arm_book_lib.h"
+#include "display.h"
+
+//=====[Declaration of private defines]========================================
+
+#define DISPLAY_IR_CLEAR_DISPLAY 0b00000001
+#define DISPLAY_IR_ENTRY_MODE_SET 0b00000100
+#define DISPLAY_IR_DISPLAY_CONTROL 0b00001000
+#define DISPLAY_IR_FUNCTION_SET 0b00100000
+#define DISPLAY_IR_SET_DDRAM_ADDR 0b10000000
+
+#define DISPLAY_IR_ENTRY_MODE_SET_INCREMENT 0b00000010
+#define DISPLAY_IR_ENTRY_MODE_SET_DECREMENT 0b00000000
+#define DISPLAY_IR_ENTRY_MODE_SET_SHIFT 0b00000001
+#define DISPLAY_IR_ENTRY_MODE_SET_NO_SHIFT 0b00000000
+
+#define DISPLAY_IR_DISPLAY_CONTROL_DISPLAY_ON 0b00000100
+#define DISPLAY_IR_DISPLAY_CONTROL_DISPLAY_OFF 0b00000000
+#define DISPLAY_IR_DISPLAY_CONTROL_CURSOR_ON 0b00000010
+#define DISPLAY_IR_DISPLAY_CONTROL_CURSOR_OFF 0b00000000
+#define DISPLAY_IR_DISPLAY_CONTROL_BLINK_ON 0b00000001
+#define DISPLAY_IR_DISPLAY_CONTROL_BLINK_OFF 0b00000000
+
+#define DISPLAY_IR_FUNCTION_SET_8BITS 0b00010000
+#define DISPLAY_IR_FUNCTION_SET_4BITS 0b00000000
+#define DISPLAY_IR_FUNCTION_SET_2LINES 0b00001000
+#define DISPLAY_IR_FUNCTION_SET_1LINE 0b00000000
+#define DISPLAY_IR_FUNCTION_SET_5x10DOTS 0b00000100
+#define DISPLAY_IR_FUNCTION_SET_5x8DOTS 0b00000000
+
+#define DISPLAY_20x4_LINE1_FIRST_CHARACTER_ADDRESS 0
+#define DISPLAY_20x4_LINE2_FIRST_CHARACTER_ADDRESS 64
+#define DISPLAY_20x4_LINE3_FIRST_CHARACTER_ADDRESS 20
+#define DISPLAY_20x4_LINE4_FIRST_CHARACTER_ADDRESS 84
+
+#define DISPLAY_RS_INSTRUCTION 0
+#define DISPLAY_RS_DATA 1
+
+#define DISPLAY_RW_WRITE 0
+#define DISPLAY_RW_READ 1
+
+#define DISPLAY_PIN_RS 4
+#define DISPLAY_PIN_RW 5
+#define DISPLAY_PIN_EN 6
+#define DISPLAY_PIN_D0 7
+#define DISPLAY_PIN_D1 8
+#define DISPLAY_PIN_D2 9
+#define DISPLAY_PIN_D3 10
+#define DISPLAY_PIN_D4 11
+#define DISPLAY_PIN_D5 12
+#define DISPLAY_PIN_D6 13
+#define DISPLAY_PIN_D7 14
+
+#define DISPLAY_PIN_A_PCF8574 3
+
+#define I2C1_SDA PB_9
+#define I2C1_SCL PB_8
+
+#define PCF8574_I2C_BUS_8BIT_WRITE_ADDRESS 78
+
+//=====[Declaration of private data types]=====================================
+
+typedef struct{
+ int address;
+ char data;
+ bool displayPin_RS;
+ bool displayPin_RW;
+ bool displayPin_EN;
+ bool displayPin_A;
+ bool displayPin_D4;
+ bool displayPin_D5;
+ bool displayPin_D6;
+ bool displayPin_D7;
+} pcf8574_t;
+
+//=====[Declaration and initialization of public global objects]===============
+
+DigitalOut displayD0( D0 );
+DigitalOut displayD1( D1 );
+DigitalOut displayD2( D2 );
+DigitalOut displayD3( D3 );
+DigitalOut displayD4( D4 );
+DigitalOut displayD5( D5 );
+DigitalOut displayD6( D6 );
+DigitalOut displayD7( D7 );
+DigitalOut displayRS( D8 );
+DigitalOut displayEN( D9 );
+
+I2C I2C_PCF8574( I2C1_SDA, I2C1_SCL );
+
+//=====[Declaration of external public global variables]=======================
+
+//=====[Declaration and initialization of public global variables]=============
+
+//=====[Declaration and initialization of private global variables]============
+
+static display_t display;
+static pcf8574_t pcf8574;
+static bool initial8BitCommunicationIsCompleted;
+
+//=====[Declarations (prototypes) of private functions]========================
+
+static void displayPinWrite( uint8_t pinName, int value );
+static void displayDataBusWrite( uint8_t dataByte );
+static void displayCodeWrite( bool type, uint8_t dataBus );
+
+//=====[Implementations of public functions]===================================
+
+void displayInit( displayConnection_t connection )
+{
+ display.connection = connection;
+
+ if( display.connection == DISPLAY_CONNECTION_I2C_PCF8574_IO_EXPANDER) {
+ pcf8574.address = PCF8574_I2C_BUS_8BIT_WRITE_ADDRESS;
+ pcf8574.data = 0b00000000;
+ I2C_PCF8574.frequency(100000);
+ displayPinWrite( DISPLAY_PIN_A_PCF8574, ON );
+ }
+
+ initial8BitCommunicationIsCompleted = FALSE;
+
+ delay( 50 );
+
+ displayCodeWrite( DISPLAY_RS_INSTRUCTION,
+ DISPLAY_IR_FUNCTION_SET |
+ DISPLAY_IR_FUNCTION_SET_8BITS );
+ delay( 5 );
+
+ displayCodeWrite( DISPLAY_RS_INSTRUCTION,
+ DISPLAY_IR_FUNCTION_SET |
+ DISPLAY_IR_FUNCTION_SET_8BITS );
+ delay( 1 );
+
+ displayCodeWrite( DISPLAY_RS_INSTRUCTION,
+ DISPLAY_IR_FUNCTION_SET |
+ DISPLAY_IR_FUNCTION_SET_8BITS );
+ delay( 1 );
+
+ switch( display.connection ) {
+ case DISPLAY_CONNECTION_GPIO_8BITS:
+ displayCodeWrite( DISPLAY_RS_INSTRUCTION,
+ DISPLAY_IR_FUNCTION_SET |
+ DISPLAY_IR_FUNCTION_SET_8BITS |
+ DISPLAY_IR_FUNCTION_SET_2LINES |
+ DISPLAY_IR_FUNCTION_SET_5x8DOTS );
+ delay( 1 );
+ break;
+
+ case DISPLAY_CONNECTION_GPIO_4BITS:
+ case DISPLAY_CONNECTION_I2C_PCF8574_IO_EXPANDER:
+ displayCodeWrite( DISPLAY_RS_INSTRUCTION,
+ DISPLAY_IR_FUNCTION_SET |
+ DISPLAY_IR_FUNCTION_SET_4BITS );
+ delay( 1 );
+
+ initial8BitCommunicationIsCompleted = TRUE;
+
+ displayCodeWrite( DISPLAY_RS_INSTRUCTION,
+ DISPLAY_IR_FUNCTION_SET |
+ DISPLAY_IR_FUNCTION_SET_4BITS |
+ DISPLAY_IR_FUNCTION_SET_2LINES |
+ DISPLAY_IR_FUNCTION_SET_5x8DOTS );
+ delay( 1 );
+ break;
+ }
+
+ displayCodeWrite( DISPLAY_RS_INSTRUCTION,
+ DISPLAY_IR_DISPLAY_CONTROL |
+ DISPLAY_IR_DISPLAY_CONTROL_DISPLAY_OFF |
+ DISPLAY_IR_DISPLAY_CONTROL_CURSOR_OFF |
+ DISPLAY_IR_DISPLAY_CONTROL_BLINK_OFF );
+ delay( 1 );
+
+ displayCodeWrite( DISPLAY_RS_INSTRUCTION,
+ DISPLAY_IR_CLEAR_DISPLAY );
+ delay( 1 );
+
+ displayCodeWrite( DISPLAY_RS_INSTRUCTION,
+ DISPLAY_IR_ENTRY_MODE_SET |
+ DISPLAY_IR_ENTRY_MODE_SET_INCREMENT |
+ DISPLAY_IR_ENTRY_MODE_SET_NO_SHIFT );
+ delay( 1 );
+
+ displayCodeWrite( DISPLAY_RS_INSTRUCTION,
+ DISPLAY_IR_DISPLAY_CONTROL |
+ DISPLAY_IR_DISPLAY_CONTROL_DISPLAY_ON |
+ DISPLAY_IR_DISPLAY_CONTROL_CURSOR_OFF |
+ DISPLAY_IR_DISPLAY_CONTROL_BLINK_OFF );
+ delay( 1 );
+}
+
+void displayCharPositionWrite( uint8_t charPositionX, uint8_t charPositionY )
+{
+ switch( charPositionY ) {
+ case 0:
+ displayCodeWrite( DISPLAY_RS_INSTRUCTION,
+ DISPLAY_IR_SET_DDRAM_ADDR |
+ ( DISPLAY_20x4_LINE1_FIRST_CHARACTER_ADDRESS +
+ charPositionX ) );
+ delay( 1 );
+ break;
+
+ case 1:
+ displayCodeWrite( DISPLAY_RS_INSTRUCTION,
+ DISPLAY_IR_SET_DDRAM_ADDR |
+ ( DISPLAY_20x4_LINE2_FIRST_CHARACTER_ADDRESS +
+ charPositionX ) );
+ delay( 1 );
+ break;
+
+ case 2:
+ displayCodeWrite( DISPLAY_RS_INSTRUCTION,
+ DISPLAY_IR_SET_DDRAM_ADDR |
+ ( DISPLAY_20x4_LINE3_FIRST_CHARACTER_ADDRESS +
+ charPositionX ) );
+ delay( 1 );
+ break;
+
+ case 3:
+ displayCodeWrite( DISPLAY_RS_INSTRUCTION,
+ DISPLAY_IR_SET_DDRAM_ADDR |
+ ( DISPLAY_20x4_LINE4_FIRST_CHARACTER_ADDRESS +
+ charPositionX ) );
+ delay( 1 );
+ break;
+ }
+}
+
+void displayStringWrite( char const * str )
+{
+ while (*str) {
+ displayCodeWrite(DISPLAY_RS_DATA, *str++);
+ }
+}
+
+//=====[Implementations of private functions]==================================
+
+static void displayCodeWrite( bool type, uint8_t dataBus )
+{
+ if ( type == DISPLAY_RS_INSTRUCTION )
+ displayPinWrite( DISPLAY_PIN_RS, DISPLAY_RS_INSTRUCTION);
+ else
+ displayPinWrite( DISPLAY_PIN_RS, DISPLAY_RS_DATA);
+ displayPinWrite( DISPLAY_PIN_RW, DISPLAY_RW_WRITE );
+ displayDataBusWrite( dataBus );
+}
+
+static void displayPinWrite( uint8_t pinName, int value )
+{
+ switch( display.connection ) {
+ case DISPLAY_CONNECTION_GPIO_8BITS:
+ switch( pinName ) {
+ case DISPLAY_PIN_D0: displayD0 = value; break;
+ case DISPLAY_PIN_D1: displayD1 = value; break;
+ case DISPLAY_PIN_D2: displayD2 = value; break;
+ case DISPLAY_PIN_D3: displayD3 = value; break;
+ case DISPLAY_PIN_D4: displayD4 = value; break;
+ case DISPLAY_PIN_D5: displayD5 = value; break;
+ case DISPLAY_PIN_D6: displayD6 = value; break;
+ case DISPLAY_PIN_D7: displayD7 = value; break;
+ case DISPLAY_PIN_RS: displayRS = value; break;
+ case DISPLAY_PIN_EN: displayEN = value; break;
+ case DISPLAY_PIN_RW: break;
+ default: break;
+ }
+ case DISPLAY_CONNECTION_GPIO_4BITS:
+ switch( pinName ) {
+ case DISPLAY_PIN_D4: displayD4 = value; break;
+ case DISPLAY_PIN_D5: displayD5 = value; break;
+ case DISPLAY_PIN_D6: displayD6 = value; break;
+ case DISPLAY_PIN_D7: displayD7 = value; break;
+ case DISPLAY_PIN_RS: displayRS = value; break;
+ case DISPLAY_PIN_EN: displayEN = value; break;
+ case DISPLAY_PIN_RW: break;
+ default: break;
+ }
+ break;
+
+ case DISPLAY_CONNECTION_I2C_PCF8574_IO_EXPANDER:
+ if ( value ) {
+ switch( pinName ) {
+ case DISPLAY_PIN_D4: pcf8574.displayPin_D4 = ON; break;
+ case DISPLAY_PIN_D5: pcf8574.displayPin_D5 = ON; break;
+ case DISPLAY_PIN_D6: pcf8574.displayPin_D6 = ON; break;
+ case DISPLAY_PIN_D7: pcf8574.displayPin_D7 = ON; break;
+ case DISPLAY_PIN_RS: pcf8574.displayPin_RS = ON; break;
+ case DISPLAY_PIN_EN: pcf8574.displayPin_EN = ON; break;
+ case DISPLAY_PIN_RW: pcf8574.displayPin_RW = ON; break;
+ case DISPLAY_PIN_A_PCF8574: pcf8574.displayPin_A = ON; break;
+ default: break;
+ }
+ }
+ else {
+ switch( pinName ) {
+ case DISPLAY_PIN_D4: pcf8574.displayPin_D4 = OFF; break;
+ case DISPLAY_PIN_D5: pcf8574.displayPin_D5 = OFF; break;
+ case DISPLAY_PIN_D6: pcf8574.displayPin_D6 = OFF; break;
+ case DISPLAY_PIN_D7: pcf8574.displayPin_D7 = OFF; break;
+ case DISPLAY_PIN_RS: pcf8574.displayPin_RS = OFF; break;
+ case DISPLAY_PIN_EN: pcf8574.displayPin_EN = OFF; break;
+ case DISPLAY_PIN_RW: pcf8574.displayPin_RW = OFF; break;
+ case DISPLAY_PIN_A_PCF8574: pcf8574.displayPin_A = OFF; break;
+ default: break;
+ }
+ }
+ pcf8574.data = 0b00000000;
+ if ( pcf8574.displayPin_RS ) pcf8574.data |= 0b00000001;
+ if ( pcf8574.displayPin_RW ) pcf8574.data |= 0b00000010;
+ if ( pcf8574.displayPin_EN ) pcf8574.data |= 0b00000100;
+ if ( pcf8574.displayPin_A ) pcf8574.data |= 0b00001000;
+ if ( pcf8574.displayPin_D4 ) pcf8574.data |= 0b00010000;
+ if ( pcf8574.displayPin_D5 ) pcf8574.data |= 0b00100000;
+ if ( pcf8574.displayPin_D6 ) pcf8574.data |= 0b01000000;
+ if ( pcf8574.displayPin_D7 ) pcf8574.data |= 0b10000000;
+ I2C_PCF8574.write( pcf8574.address, &pcf8574.data, 1);
+ break;
+ }
+}
+
+static void displayDataBusWrite( uint8_t dataBus )
+{
+ displayPinWrite( DISPLAY_PIN_EN, OFF );
+ displayPinWrite( DISPLAY_PIN_D7, dataBus & 0b10000000 );
+ displayPinWrite( DISPLAY_PIN_D6, dataBus & 0b01000000 );
+ displayPinWrite( DISPLAY_PIN_D5, dataBus & 0b00100000 );
+ displayPinWrite( DISPLAY_PIN_D4, dataBus & 0b00010000 );
+ switch( display.connection ) {
+ case DISPLAY_CONNECTION_GPIO_8BITS:
+ displayPinWrite( DISPLAY_PIN_D3, dataBus & 0b00001000 );
+ displayPinWrite( DISPLAY_PIN_D2, dataBus & 0b00000100 );
+ displayPinWrite( DISPLAY_PIN_D1, dataBus & 0b00000010 );
+ displayPinWrite( DISPLAY_PIN_D0, dataBus & 0b00000001 );
+ break;
+
+ case DISPLAY_CONNECTION_GPIO_4BITS:
+ case DISPLAY_CONNECTION_I2C_PCF8574_IO_EXPANDER:
+ if ( initial8BitCommunicationIsCompleted == TRUE) {
+ displayPinWrite( DISPLAY_PIN_EN, ON );
+ delay( 1 );
+ displayPinWrite( DISPLAY_PIN_EN, OFF );
+ delay( 1 );
+ displayPinWrite( DISPLAY_PIN_D7, dataBus & 0b00001000 );
+ displayPinWrite( DISPLAY_PIN_D6, dataBus & 0b00000100 );
+ displayPinWrite( DISPLAY_PIN_D5, dataBus & 0b00000010 );
+ displayPinWrite( DISPLAY_PIN_D4, dataBus & 0b00000001 );
+ }
+ break;
+
+ }
+ displayPinWrite( DISPLAY_PIN_EN, ON );
+ delay( 1 );
+ displayPinWrite( DISPLAY_PIN_EN, OFF );
+ delay( 1 );
+}
\ No newline at end of file