Marcelo Costanzo Miranda
ST7920 Testes
Diff: ST7920.cpp
- Revision:
- 2:5bcfb7105fa2
- Parent:
- 1:08481151e25e
--- a/ST7920.cpp Mon Dec 14 19:10:22 2020 +0000
+++ b/ST7920.cpp Tue Dec 15 12:27:29 2020 +0000
@@ -10,79 +10,145 @@
void ST7920_Init()
{
- wait_ms(40); // wait 40ms
+ //function set 8-bit mode
+ wait_ms(100);
+ RS = 0;
+ RW = 0;
+ wait_us(100);
+ EN = 1;
+ DB = FUNCTION_SET | DATA_LENGTH_DL;
+ wait_us(100);
EN = 0;
+
+ //function set 8-bit mode again
+ wait_us(1000);
RS = 0;
RW = 0;
wait_us(100);
EN = 1;
DB = FUNCTION_SET | DATA_LENGTH_DL;
+ wait_us(100);
EN = 0;
-
- wait_us(100); // wait 100us
- RS = 0;
- RW = 0;
- wait_us(100);
- EN = 1;
- DB = FUNCTION_SET | DATA_LENGTH_DL;
- EN = 0;
-
-
- wait_us(37); // wait 37us
+
+ // display on
+ wait_us(1000);
RS = 0;
RW = 0;
wait_us(100);
EN = 1;
DB = DISPLAY_CONTROL | DISPLAY_ON_D;
+ wait_us(100);
EN = 0;
-
-
- wait_us(100); // wait 100us
+
+ // cursor - Display shift right by 1, cursor also follows to shift.
+ wait_us(1000);
+ RS = 0;
+ RW = 0;
+ wait_us(100);
+ EN = 1;
+ DB = 0x1C;
+ wait_us(100);
+ EN = 0;
+
+ // clear screen
+ wait_us(1000);
RS = 0;
RW = 0;
wait_us(100);
EN = 1;
DB = DISPLAY_CLEAR;
+ wait_us(100);
EN = 0;
-
- wait_ms(10); // wait 10ms
- RS = 0;
- RW = 0;
- wait_us(100);
- EN = 1;
- DB = ENTRY_MODE_SET | INCREASE_DECREASE_ID;
- EN = 0;
-
- wait_ms(10); // wait 10ms
+
+ // Returns to home. Cursor moves to starting point
+ wait_ms(1);
RS = 0;
RW = 0;
wait_us(100);
EN = 1;
DB = RETURN_HOME;
+ wait_us(100);
+ EN = 0;
+
+ // Setting location to write characters. In this case 0,0 - Top Left Corner
+ wait_ms(1);
+ RS = 0;
+ RW = 0;
+ wait_us(100);
+ EN = 1;
+ DB = 0x80;
+ wait_us(100);
EN = 0;
}
void ST7920_Clear()
{
- /*wait_us(100);
- RS = 0;
- RW = 0;
- EN = 1;
- wait_us(100);
- DB = FUNCTION_SET | DATA_LENGTH_DL;
- EN = 0;
- */
- wait_us(100);
- RS = 0;
- RW = 0;
- EN = 1;
- wait_us(100);
- DB = DISPLAY_CLEAR;
- EN = 0;
+ //=========== This function set all the pixels to off in the graphic controller =================
+ for(int y = 0; y < 64; y++)
+ {
+ if(y < 32)
+ {
+ wait_us(100);//wait_us(1000);
+ RS = 0;
+ RW = 0;
+ wait_us(100);
+ EN = 1;
+ DB = 0x80 | y;
+ wait_us(100);
+ EN = 0;
+ wait_us(100);
+
+ wait_us(100);//wait_us(1000);
+ RS = 0;
+ RW = 0;
+ wait_us(100);
+ EN = 1;
+ DB = 0x80;
+ wait_us(100);
+ EN = 0;
+ wait_us(100);
+ }
+
+ else
+ {
+ wait_us(100);//wait_us(1000);
+ RS = 0;
+ RW = 0;
+ wait_us(100);
+ EN = 1;
+ DB = 0x80 | (y - 32);
+ wait_us(100);
+ EN = 0;
+ wait_us(100);
+
+ wait_us(100);//wait_us(1000);
+ RS = 0;
+ RW = 0;
+ wait_us(100);
+ EN = 1;
+ DB = 0x88;
+ wait_us(100);
+ EN = 0;
+ wait_us(100);
+ }
+
+ for(int x = 0; x < 16; x++)
+ {
+ wait_us(100);//wait_us(1000);
+ RS = 1;
+ RW = 0;
+ wait_us(100);
+ EN = 1;
+ DB = 0x00;
+ wait_us(100);
+ EN = 0;
+ wait_us(20);
+ }
+ }
}
void ST7920_SetGraphicsMode()
-{
+{
wait_us(1000);
RS = 0;
RW = 0;
@@ -91,7 +157,7 @@
DB = EXTENDED_FUNCTION_SET | DATA_LENGTH_DL;
wait_us(100);
EN = 0;
-
+
wait_us(1000);
RS = 0;
RW = 0;
@@ -99,8 +165,8 @@
wait_us(100);
DB = EXTENDED_FUNCTION_SET | DATA_LENGTH_DL | EXTENDED_INSTRUCTION_RE;
EN = 0;
-
- wait_us(1000);
+
+ wait_us(100);
RS = 0;
RW = 0;
EN = 1;
@@ -109,7 +175,7 @@
EN = 0;
}
-void ST7920_SetTextMode()
+void ST7920_SetTextMode()
{
wait_us(100);
RS = 0;
@@ -122,70 +188,7 @@
void ST7920_DrawHorizontalLine(uint8_t X, uint8_t Y, uint8_t LEN)
{
//desenhando uma linha de tamanho T em Y, com X offset
-
- wait_us(1000);
- RS = 0;
- RW = 0;
- wait_us(100);
- EN = ON;
- DB = 0x80 | Y;
- wait_us(100);
- EN = OFF;
- wait_us(100);
-
- wait_us(1000);
- RS = 0;
- RW = 0;
- wait_us(100);
- EN = ON;
- DB = 0x80 | X;
- wait_us(100);
- EN = OFF;
- wait_us(100);
-
- for(int i = 0; i < (LEN / 8); i++)
- {
- wait_us(1000);
- RS = 1;
- RW = 0;
- wait_us(100);
- EN = ON;
- DB = (255);
- wait_us(100);
- EN = OFF;
- wait_us(20);
- }
- if(LEN%8 != 0)
- {
- int LEN_rest = LEN - ((LEN / 8) * 8);
- int bus_rest;
-
- switch (LEN_rest)
- {
- case 1: bus_rest = 0x80; break;
- case 2: bus_rest = 0xC0; break;
- case 3: bus_rest = 0xE0; break;
- case 4: bus_rest = 0xF0; break;
- case 5: bus_rest = 0xF8; break;
- case 6: bus_rest = 0xFC; break;
- case 7: bus_rest = 0xFE; break;
- }
- //pc.printf("%x\n\r",bus_rest);
- wait_us(1000);
- RS = 1;
- RW = 0;
- wait_us(100);
- EN = ON;
- DB = bus_rest; // tem que ser 254 no exemplo de T 255
- wait_us(100);
- EN = OFF;
- wait_us(20);
- }
-}
-
-void ST7920_DrawVerticalLine(uint8_t X, uint8_t Y, uint8_t LEN)
-{
wait_us(1000);
RS = 0;
RW = 0;
@@ -195,7 +198,7 @@
wait_us(100);
EN = 0;
wait_us(100);
-
+
wait_us(1000);
RS = 0;
RW = 0;
@@ -205,66 +208,142 @@
wait_us(100);
EN = 0;
wait_us(100);
-
- for(int y = 0; y < LEN; y++)
- {
- if(y < 32)
- {
- wait_us(1000);
+
+ for(int i = 0; i < (LEN / 8); i++)
+ {
+ wait_us(1000);
+ RS = 1;
+ RW = 0;
+ wait_us(100);
+ EN = 1;
+ DB = 255;
+ wait_us(100);
+ EN = 0;
+ wait_us(20);
+ }
+
+ if(LEN%8 != 0)
+ {
+ int LEN_rest = LEN - ((LEN / 8) * 8);
+ int bus_rest;
+
+ switch (LEN_rest)
+ {
+ case 1:
+ bus_rest = 0x80;
+ break;
+ case 2:
+ bus_rest = 0xC0;
+ break;
+ case 3:
+ bus_rest = 0xE0;
+ break;
+ case 4:
+ bus_rest = 0xF0;
+ break;
+ case 5:
+ bus_rest = 0xF8;
+ break;
+ case 6:
+ bus_rest = 0xFC;
+ break;
+ case 7:
+ bus_rest = 0xFE;
+ break;
+ }
+ //pc.printf("%x\n\r",bus_rest);
+ wait_us(1000);
+ RS = 1;
+ RW = 0;
+ wait_us(100);
+ EN = 1;
+ DB = bus_rest; // tem que ser 254 no exemplo de T 255
+ wait_us(100);
+ EN = 0;
+ wait_us(20);
+ }
+}
+
+void ST7920_DrawVerticalLine(uint8_t X, uint8_t Y, uint8_t LEN)
+{
+ wait_us(100);
+ RS = 0;
+ RW = 0;
+ wait_us(100);
+ EN = 1;
+ DB = 0x80 | Y;
+ wait_us(100);
+ EN = 0;
+ wait_us(100);
+
+ wait_us(100);
+ RS = 0;
+ RW = 0;
+ wait_us(100);
+ EN = 1;
+ DB = 0x80 | X;
+ wait_us(100);
+ EN = 0;
+ wait_us(100);
+
+ for(int y = 0; y < LEN; y++)
+ {
+ if(y < 32) {
+ wait_us(100);
RS = 0;
RW = 0;
wait_us(100);
- EN = ON;
- DB = (0x80 | y);
+ EN = 1;
+ DB = 0x80 | y;
wait_us(100);
- EN = OFF;
+ EN = 0;
wait_us(100);
-
+
wait_us(1000);
RS = 0;
RW = 0;
wait_us(100);
- EN = ON;
+ EN = 1;
DB = 0x80;
wait_us(100);
- EN = OFF;
+ EN = 0;
+ wait_us(100);
+ }
+
+ else
+ {
wait_us(100);
- }
-
- else
- {
+ RS = 0;
+ RW = 0;
+ wait_us(100);
+ EN = 1;
+ DB = 0x80 | (y - 32);
+ wait_us(100);
+ EN = 0;
+ wait_us(100);
+
wait_us(1000);
RS = 0;
RW = 0;
wait_us(100);
- EN = ON;
- DB = (0x80 | (y - 32));
- wait_us(100);
- EN = OFF;
- wait_us(100);
-
- wait_us(1000);
- RS = 0;
- RW = 0;
- wait_us(100);
- EN = ON;
+ EN = 1;
DB = 0x88;
wait_us(100);
- EN = OFF;
+ EN = 0;
wait_us(100);
- }
-
- wait_us(1000);
- RS = 1;
- RW = 0;
- wait_us(100);
- EN = ON;
- DB = 0x80;
- wait_us(100);
- EN = OFF;
- wait_us(20);
- }
-}
+ }
+
+ wait_us(100);
+ RS = 1;
+ RW = 0;
+ wait_us(100);
+ EN = 1;
+ DB = 0x80;
+ wait_us(100);
+ EN = 0;
+ wait_us(20);
+ }
+}
void ST7920_DisplayString(int Row,int Column,unsigned char *ptr,int length)
{
@@ -289,11 +368,12 @@
break;
}
- if (Column%2!=0) {
+ if (Column%2!=0)
+ {
Column-=1;
i=1;
}
-
+
wait_us(100);
RS = 0;
RW = 0;
@@ -320,4 +400,4 @@
DB = ((unsigned int)ptr[i]);
EN = 0;
}
-}
\ No newline at end of file
+}