Marcelo Costanzo Miranda
ST7920 Testes
Diff: ST7920.cpp
- Revision:
- 1:08481151e25e
- Child:
- 2:5bcfb7105fa2
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/ST7920.cpp Mon Dec 14 19:10:22 2020 +0000
@@ -0,0 +1,323 @@
+#include "ST7920.h"
+
+BusOut DB(D5, D6, D7, D8, D9, D10, D11, D12); // DB0 - DB7 RESPECTIVAMENTE
+//BusOut DB(D12, D11, D10, D9, D8, D7, D6, D5); // DB7 - DB0 RESPECTIVAMENTE
+
+DigitalOut RS(D2);
+DigitalOut RW(D3);
+DigitalOut EN(D4);
+
+
+void ST7920_Init()
+{
+ wait_ms(40); // wait 40ms
+ EN = 0;
+ RS = 0;
+ RW = 0;
+ wait_us(100);
+ EN = 1;
+ DB = FUNCTION_SET | DATA_LENGTH_DL;
+ 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
+ RS = 0;
+ RW = 0;
+ wait_us(100);
+ EN = 1;
+ DB = DISPLAY_CONTROL | DISPLAY_ON_D;
+ EN = 0;
+
+
+ wait_us(100); // wait 100us
+ RS = 0;
+ RW = 0;
+ wait_us(100);
+ EN = 1;
+ DB = DISPLAY_CLEAR;
+ 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
+ RS = 0;
+ RW = 0;
+ wait_us(100);
+ EN = 1;
+ DB = RETURN_HOME;
+ 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;
+}
+
+void ST7920_SetGraphicsMode()
+{
+ wait_us(1000);
+ RS = 0;
+ RW = 0;
+ EN = 1;
+ wait_us(100);
+ DB = EXTENDED_FUNCTION_SET | DATA_LENGTH_DL;
+ wait_us(100);
+ EN = 0;
+
+ wait_us(1000);
+ RS = 0;
+ RW = 0;
+ EN = 1;
+ wait_us(100);
+ DB = EXTENDED_FUNCTION_SET | DATA_LENGTH_DL | EXTENDED_INSTRUCTION_RE;
+ EN = 0;
+
+ wait_us(1000);
+ RS = 0;
+ RW = 0;
+ EN = 1;
+ wait_us(100);
+ DB = EXTENDED_FUNCTION_SET | DATA_LENGTH_DL | EXTENDED_INSTRUCTION_RE | GRAPHIC_ON_G;
+ EN = 0;
+}
+
+void ST7920_SetTextMode()
+{
+ wait_us(100);
+ RS = 0;
+ RW = 0;
+ EN = 1;
+ DB = FUNCTION_SET | DATA_LENGTH_DL;
+ EN = 0;
+}
+
+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;
+ wait_us(100);
+ EN = 1;
+ DB = 0x80 | Y;
+ wait_us(100);
+ EN = 0;
+ wait_us(100);
+
+ wait_us(1000);
+ 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(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;
+ wait_us(100);
+ EN = OFF;
+ wait_us(100);
+ }
+
+ else
+ {
+ 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;
+ DB = 0x88;
+ wait_us(100);
+ EN = OFF;
+ 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);
+ }
+}
+
+void ST7920_DisplayString(int Row,int Column,unsigned char *ptr,int length)
+{
+ int i=0;
+
+ switch (Row)
+ {
+ case 0:
+ Column|=0x80;
+ break;
+ case 1:
+ Column|=0x90;
+ break;
+ case 2:
+ Column|=0x88;
+ break;
+ case 3:
+ Column|=0x98;
+ break;
+ default:
+ Column=0x80;
+ break;
+ }
+
+ if (Column%2!=0) {
+ Column-=1;
+ i=1;
+ }
+
+ wait_us(100);
+ RS = 0;
+ RW = 0;
+ EN = 1;
+ wait_us(100);
+ DB = Column;
+ EN = 0;
+
+ if (i==1)
+ {
+ wait_us(100);
+ RS = 1;
+ RW = 0;
+ EN = 1;
+ DB = ' ';
+ EN = 0;
+ }
+ for (i=0; i<length; i++)
+ {
+ wait_us(100);
+ RS = 1;
+ RW = 0;
+ EN = 1;
+ DB = ((unsigned int)ptr[i]);
+ EN = 0;
+ }
+}
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