Radoslav Oranski
LCD Display module 12864ZW (ST7920). This is a simple serial (SPI) interface demo using Freescale KL25Z and LCD module. One of the possible manuals can be found at: http://www.digole.com/images/file/Digole_12864_LCD.pdf
Diff: 12864ZW.cpp
- Revision:
- 1:b7d7b8522b73
- Parent:
- 0:01ba9e985849
--- a/12864ZW.cpp Fri Feb 14 07:30:55 2014 +0000
+++ /dev/null Thu Jan 01 00:00:00 1970 +0000
@@ -1,118 +0,0 @@
-/*
- ST7920 12864ZB LCD module via the clock synchronized serial interface.
-
- Data sheet for 12864ZB lcd display module:
- http://www.digole.com/images/file/Digole_12864_LCD.pdf
-
- LCD Pin Configurations:
- |-----|------|--------|-------|
- | LCD | DESCRIPTIONS | KL25Z |
- | PIN |SERIAL|PARALLEL| PIN |
- | ----|------|--------|-------|
- | VSS | GND | GND | GND |
- | VDD | 5V | 5V | 5V |
- | RS | CS | RS | PTC17 |
- | R/W | SID | RW | PTD2 |
- | E | SCLK | E | PTD1 |
- | BLA | 5V | 5V | 5V |
- | BLK | GND | GND | GND |
- |-----|------|--------|-------|
-
- */
-
-#include "mbed.h"
-
-SPI spi(PTD2, PTD3, PTD1); // The default format is set to 8-bits, mode 0, and a clock frequency of 1MHz
-
-DigitalOut PinRS(PTC17);
-
-/*
- Timing Diagram of Serial Mode Data Transfer on p.20
-
- |-------------------|------------------------|------------------------|
- | Synchronizing | 1-st Byte Higher data | 2-nd Byte Lower data |
- |-------------------|------------------------|------------------------|
- | 1 1 1 1 1 RW RS 0 | D7 D6 D5 D4 0 0 0 0| D3 D2 D1 D0 0 0 0 0|
- |-------------------|------------------------|------------------------|
-*/
-
-void InstructionRegsiter(uint8_t inst)
-{
- spi.write(0xf8); // Sync. - 1 1 1 1 1 0 0 0
- spi.write(inst & 0xf0); // HighData - D7 D6 D5 D4 0 0 0 0
- spi.write(inst << 4); // LowData - D3 D2 D1 D0 0 0 0 0
- // According to table "Instruction Set 1: (RE=0: Basic Instruction)" on p.10
- if (inst == 0x01) {
- wait_ms(1.6);
- } else {
- wait_us(72);
- }
-}
-
-void DataRegister(uint8_t data)
-{
- spi.write(0xfa); // Sync. - 1 1 1 1 1 0 1 0
- spi.write(data & 0xf0); // HighData - D7 D6 D5 D4 0 0 0 0
- spi.write(data << 4); // LowData - D3 D2 D1 D0 0 0 0 0
- wait_us(72);
-}
-
-// Manual p.28
-void ResetLCD()
-{
- //Function set [DL=1 8-bit interface; DL=0 4-bit interface;
- // RE=1: extended instruction; RE=0: basic instruction]
- // RS RW DB7 DB6 DB5 DB4 DB3 DB2 DB1 DB0
- // 0 0 0 0 1 DL X RE 0 0
- InstructionRegsiter(0x30);
- wait_us(100);
- //Function set [DL=1 8-bit interface; DL=0 4-bit interface;
- // RE=1: extended instruction; RE=0: basic instruction]
- // RS RW DB7 DB6 DB5 DB4 DB3 DB2 DB1 DB0
- // 0 0 0 0 1 DL X RE 0 0
- InstructionRegsiter(0x30);
- wait_us(47);
- // DisplayControl [D=1: Display ON; C=1: Cursor ON; B=1: Character Blink ON]
- // RS RW DB7 DB6 DB5 DB4 DB3 DB2 DB1 DB0
- // 0 0 0 0 0 0 1 D C B
- InstructionRegsiter(0x0c);
- wait_us(100);
- // Display Clear
- InstructionRegsiter(0x01);
- wait_ms(10);
- //Set cursor position and display shift when doing write or read operation
- // RS RW DB7 DB6 DB5 DB4 DB3 DB2 DB1 DB0
- // 0 0 0 0 0 0 0 1 I/D S
- InstructionRegsiter(0x06);
-}
-
-int main()
-{
- // For a minimal system with only one ST7920 and one MPU, only SCLK and SID pins are necessary.
- // CS pin should pull to high.
- PinRS = 1;
-
- ResetLCD();
-
- while (true) {
- InstructionRegsiter(0x01); // Display Clear, AC = 0
- InstructionRegsiter(0x80);
- // List the build in font 1/2 - Table 6 on p.8
- for (uint8_t r = 0x00; r < 0x04; r++) {
- for (uint8_t c = 0x00; c < 0x10; c++) {
- DataRegister(r<<4|c);
- }
- }
- wait_ms(2000);
-
- InstructionRegsiter(0x01); // Display Clear, AC = 0
- InstructionRegsiter(0x80);
- // List the build in font 2/2 - Table 6 on p.8
- for (uint8_t r = 0x04; r < 0x08; r++) {
- for (uint8_t c = 0x00; c < 0x10; c++) {
- DataRegister(r<<4|c);
- }
- }
- wait_ms(2000);
- }
-}
\ No newline at end of file