Hi, I am trying to output numbers to a samsung UC-20102-GNARS one line 20 character lcd display from a PIC16f684 microcontroller.
I'm having some trouble... I have things wired as follows according to pin #:
PIC ------------ LCD
14 ------------- GND
13
12
11
10 (C0) -------- D4
9 (C1) --------- D5
8 (C2) --------- D6
7 (C3) --------- D7
6
5
4
3 (A4) --------- RS
2 (A5) --------- Enable
1 --------------- +5v
Here's my code:
#include <Temp Sensor.h>
#include <math.h>
#define ENABLE PIN_A5
#define RS PIN_A4
#define LCD_TYPE 1
// Function/Global Variable Delcaration
void Initialize(void);
void InitLCD(void);
void lcd_send_nibble(char c);
void lcd_send_data(char c);
void lcd_send_command(char command);
int i;
void main()
{
SET_TRIS_A(0x01);
setup_adc_ports(sAN0|VSS_VDD);
setup_adc(ADC_CLOCK_INTERNAL);
setup_timer_0(RTCC_INTERNAL|RTCC_DIV_1);
setup_timer_1(T1_DISABLED);
setup_timer_2(T2_DISABLED,0,1);
setup_comparator(NC_NC_NC_NC);
setup_vref(FALSE);
setup_oscillator(OSC_INTRC);
InitLCD();
}
void InitLCD(void)
{
// Initialize LCD
output_low(ENABLE); // Disable LCD
delay_ms(50); // Delay for 50ms
SET_TRIS_C(0x00); // All C ports set to output
delay_ms(15); // Delay for 15ms
for(i = 1; i <= 3 ; ++i)
{
output_low(RS); // Set LCD for instruction set
output_c(3); //
output_high(ENABLE); // Enable LCD
delay_us(5); // Delay 5us
output_low(ENABLE); // Disable LCD
delay_ms(5); // Delay 5ms
}
lcd_send_nibble(3); //
lcd_send_command(0x20); // Function Set:
// 4bit data length
// 1 Line
// 5 x 7 Dot Format
lcd_send_command(0x0F); // Display ON/OFF Control:
// Display ON
// Cursor ON
// Blink ON
lcd_send_command(0x01); // Display Clear
lcd_send_command(0x05); // Entry Mode Set:
// Decrement one
// Yes Shift
lcd_send_data(0x52); // "R"
lcd_send_data(0x45); // "E"
lcd_send_data(0x41); // "A"
lcd_send_data(0x44); // "D"
lcd_send_data(0x59); // "Y"
}
void lcd_send_nibble( char c )
{
output_c(c); // Output character to LCD
output_high(ENABLE); // Enable LCD
delay_us(5); // Delay 5us
output_low(ENABLE); // Disable LCD
}
void lcd_send_command(char command)
{
delay_ms(5); // Delay 5ms
output_low(RS); // Set LCD for instruction set
lcd_send_nibble(command >> 4); // Send high bits
lcd_send_nibble(command & 0x0F); // Send low bits
}
void lcd_send_data( char c)
{
delay_ms(5); // Delay 5ms
output_high(RS); // Set LCD for data set
lcd_send_nibble(c >> 4); // Send high bits
lcd_send_nibble(c & 0x0F); // Send low bits
}
As of now, the LCD will power up, but the whole line just shows black boxes.
If anyone can help I'd greatly appreciate it. Thanks.
