Prepare for 4 bit mode of operation
Signed-off-by: Collin J. Doering <collin.doering@rekahsoft.ca>
This commit is contained in:
parent
3ba737fc7b
commit
5777e2b831
156
lcdLib.c
156
lcdLib.c
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@ -21,8 +21,6 @@
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* Date: Sep 29, 2015
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*/
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//#include <avr/interrupt.h>
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//#include <avr/power.h>
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#include <util/delay.h>
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// Include header
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@ -42,48 +40,108 @@ void flashLED(uint8_t times) {
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//------------------------------------
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void clkLCD(void) {
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LCD_CTRL_PORT |= 1 << LCD_ENABLE;
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_delay_us(LCD_DELAY);
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LCD_CTRL_PORT &= ~(1 << LCD_ENABLE);
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_delay_us(LCD_DELAY);
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LCD_ENABLE_PORT |= (1 << LCD_ENABLE);
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_delay_us(LCD_ENABLE_HIGH_DELAY);
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LCD_ENABLE_PORT &= ~(1 << LCD_ENABLE);
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_delay_us(LCD_ENABLE_LOW_DELAY);
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}
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void loop_until_LCD_BF_clear(void) {
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LCD_CTRL_PORT = (LCD_CTRL_PORT & ~(1 << LCD_RS)) | (1 << LCD_RW); // RS=0, RW=1
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LCD_DBUS_DDR &= ~(1 << LCD_BF); // Set LCD_BF as input
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LCD_RS_PORT &= ~(1 << LCD_RS); // RS=0
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LCD_RW_PORT |= (1 << LCD_RW); // RW=1
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// Set LCD_BF as input
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#ifdef FOUR_BIT_MODE
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LCD_DBUS7_PORT &= ~(1 << LCD_BF);
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#else
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LCD_DBUS_DDR &= ~(1 << LCD_BF);
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#endif
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STATUS_LED_PORT |= 1 << STATUS_LED; // DEBUG
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do {
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clkLCD();
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} while (bit_is_clear(LCD_DBUS_PIN, LCD_BF));
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/* loop_until_bit_is_clear(LCD_DBUS_PIN, LCD_BF); */
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}
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#ifdef FOUR_BIT_MODE
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while (bit_is_clear(LCD_DBUS7_PIN, LCD_BF));
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#else
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while (bit_is_clear(LCD_DBUS_PIN, LCD_BF));
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#endif
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STATUS_LED_PORT &= ~(1 << STATUS_LED); // DEBUG
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#ifdef FOUR_BIT_MODE
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LCD_DBUS7_DDR = 0;
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LCD_DBUS6_DDR = 0;
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LCD_DBUS5_DDR = 0;
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LCD_DBUS4_DDR = 0;
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#else
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LCD_DBUS_DDR = 0xff; // Reset all LCD_DBUS_PORT pins as outputs
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#endif
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}
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#ifdef FOUR_BIT_MODE
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/*
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Writes one nibble to the LCD data bus. Does not touch the RS or RW control lines.
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Note: the bits that are sent are the four MSBs of the given argument
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*/
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void writeLCDNibble_(uint8_t b) {
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// Reset data lines to zeros
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LCD_DBUS7_PORT &= ~(1 << LCD_DBUS7);
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LCD_DBUS6_PORT &= ~(1 << LCD_DBUS6);
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LCD_DBUS5_PORT &= ~(1 << LCD_DBUS5);
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LCD_DBUS4_PORT &= ~(1 << LCD_DBUS4);
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// Write 1's where appropriate on data lines
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if (b & (1 << 7)) LCD_DBUS7_PORT |= (1 << LCD_DBUS7);
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if (b & (1 << 6)) LCD_DBUS6_PORT |= (1 << LCD_DBUS6);
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if (b & (1 << 5)) LCD_DBUS5_PORT |= (1 << LCD_DBUS5);
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if (b & (1 << 4)) LCD_DBUS4_PORT |= (1 << LCD_DBUS4);
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// Pulse the enable line
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clkLCD();
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}
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#endif
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/*
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Write a byte to the LCD data bus. Does not touch the RS or RW control lines.
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*/
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void writeLCDByte_(uint8_t b) {
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LCD_DBUS_PORT = b;
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clkLCD();
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}
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void writeLCDInstr_(uint8_t instr) {
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LCD_CTRL_PORT &= ~((1 << LCD_RS) | (1 << LCD_RW)); // RS=RW=0
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LCD_RS_PORT &= ~(1 << LCD_RS); // RS=0
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LCD_RW_PORT &= ~(1 << LCD_RW); // RW=0
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#ifdef FOUR_BIT_MODE
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writeLCDNibble_(instr);
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writeLCDNibble_(instr << 4);
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#else
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LCD_DBUS_PORT = instr;
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clkLCD();
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#endif
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}
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void writeLCDInstr(uint8_t instr) {
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loop_until_LCD_BF_clear(); // Wait until LCD is ready for new instructions
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writeLCDInstr_(instr);
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}
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void writeCharToLCD_(char c) {
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LCD_CTRL_PORT |= (1 << LCD_RS); // RS=1
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LCD_CTRL_PORT &= ~(1 << LCD_RW); // RW=0
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LCD_RS_PORT |= (1 << LCD_RS); // RS=1
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LCD_RW_PORT &= ~(1 << LCD_RW); // RW=0
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#ifdef FOUR_BIT_MODE
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writeLCDNibble_(c);
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writeLCDNibble_(c << 4);
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#else
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LCD_DBUS_PORT = c;
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clkLCD();
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#endif
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}
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void writeCharToLCD(char c) {
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loop_until_LCD_BF_clear(); // Wait until LCD is ready for new instructions
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writeCharToLCD_(c);
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}
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@ -96,49 +154,77 @@ void writeStringToLCD(const char* str) {
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void clearDisplay(void) {
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writeLCDInstr(CMD_CLEAR_DISPLAY);
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_delay_us(LCD_CLEAR_DISPLAY_DELAY);
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}
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void returnHome(void) {
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writeLCDInstr(CMD_RETURN_HOME);
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_delay_us(LCD_RETURN_HOME_DELAY);
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}
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char readCharFromLCD(void) {
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loop_until_LCD_BF_clear(); // Wait until LCD is ready for new instructions
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/* char readCharFromLCD(void) { */
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/* loop_until_LCD_BF_clear(); // Wait until LCD is ready for new instructions */
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LCD_CTRL_PORT |= (1 << LCD_RW) | (1 << LCD_RW); // RS=RW=1
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LCD_DBUS_DDR = 0; // Set all LCD_DBUS_PORT pins as inputs
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clkLCD();
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/* LCD_CTRL_PORT |= (1 << LCD_RW) | (1 << LCD_RW); // RS=RW=1 */
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/* LCD_DBUS_DDR = 0; // Set all LCD_DBUS_PORT pins as inputs */
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/* clkLCD(); */
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char c = LCD_DBUS_PIN;
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LCD_DBUS_DDR = 0xff; // Reset all LCD_DBUS_PORT pins to outputs
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return c;
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}
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/* char c = LCD_DBUS_PIN; */
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/* LCD_DBUS_DDR = 0xff; // Reset all LCD_DBUS_PORT pins to outputs */
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/* return c; */
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/* } */
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/*
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Set all pins of LCD_DBUS_PORT, as well as pins LCD_RS, and LCD_RW, on
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LCD_CTRL_PORT as outputs
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Set all pins of LCD_DBUS, as well as pins LCD_RS, and LCD_RW as outputs
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*/
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static inline void enableLCDOutput(void) {
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LCD_CTRL_DDR |= (1 << LCD_RS) | (1 << LCD_RW) | (1 << LCD_ENABLE);
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LCD_RS_DDR |= (1 << LCD_RS);
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LCD_RW_DDR |= (1 << LCD_RW);
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LCD_ENABLE_DDR |= (1 << LCD_ENABLE);
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#if defined (FOUR_BIT_MODE) || defined (EIGHT_BIT_ARBITRARY_PIN_MODE)
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LCD_DBUS7_DDR |= (1 << LCD_DBUS7);
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LCD_DBUS6_DDR |= (1 << LCD_DBUS6);
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LCD_DBUS5_DDR |= (1 << LCD_DBUS5);
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LCD_DBUS4_DDR |= (1 << LCD_DBUS4);
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#ifdef EIGHT_BIT_ARBITRARY_PIN_MODE
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LCD_DBUS3_DDR |= (1 << LCD_DBUS3);
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LCD_DBUS2_DDR |= (1 << LCD_DBUS2);
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LCD_DBUS1_DDR |= (1 << LCD_DBUS1);
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LCD_DBUS0_DDR |= (1 << LCD_DBUS0);
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#endif
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#else
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LCD_DBUS_DDR = 0xff;
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#endif
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}
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/*
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Set all pins of LCD_DBUS_PORT as well as LCD_RS, and LCD_RW on LCD_CTRL_PORT as
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inputs (disabling their output)
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Set all pins of LCD_DBUS as well as LCD_RS, and LCD_RW as inputs (disabling their output)
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*/
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static inline void disableLCDOutput(void) {
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LCD_CTRL_DDR &= ~((1 << LCD_RS) | (1 << LCD_RW) | (1 << LCD_ENABLE));
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LCD_RS_DDR &= ~(1 << LCD_RS);
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LCD_RW_DDR &= ~(1 << LCD_RW);
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LCD_ENABLE_DDR &= ~(1 << LCD_ENABLE);
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#ifdef FOUR_BIT_MODE
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LCD_DBUS7 &= ~(1 << LCD_DBUS7);
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LCD_DBUS6 &= ~(1 << LCD_DBUS6);
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LCD_DBUS5 &= ~(1 << LCD_DBUS5);
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LCD_DBUS4 &= ~(1 << LCD_DBUS4);
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#else
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LCD_DBUS_DDR = 0;
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#endif
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}
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static inline void softwareLCDInitPulse(void) {
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enableLCDOutput();
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LCD_CTRL_PORT &= ~((1 << LCD_RS) | (1 << LCD_RW)); // RS=RW=0
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LCD_RS_PORT &= ~(1 << LCD_RS); // RS=0
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LCD_RW_PORT &= ~(1 << LCD_RW); // RW=0
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#ifdef FOUR_BIT_MODE
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writeLCDNibble_(CMD_INIT);
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#else
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LCD_DBUS_PORT = CMD_INIT;
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clkLCD();
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#endif
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}
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/*
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@ -148,7 +234,7 @@ void initLCD (void) {
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enableLCDOutput();
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// Wait minimum 15ms as per datasheet
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_delay_ms(LCD_INIT_DELAY0);
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_delay_us(LCD_INIT_DELAY0);
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softwareLCDInitPulse();
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165
lcdLib.h
165
lcdLib.h
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@ -21,37 +21,143 @@
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* Date: Sep 29, 2015
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*/
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/*
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Usage
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=====
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Operates in 3 mutually exclusive modes:
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1. Default Mode
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8-bit mode that requires all its data bus lines be on the same PORT.
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2. EIGHT_BIT_ARBITRARY_PIN_MODE
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8-bit mode that allows the data bus lines to use any IO pin.
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3. FOUR_BIT_MODE
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4-bit mode that allows the data bus lines to use any IO pin.
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*/
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// Includes
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#include <avr/io.h>
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// LCD data bus PORT, PIN and DDR
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/* Modes */
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// Default mode: 8-bit data bus
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// 8-bit mode with data bus on arbitrary pins
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//#define EIGHT_BIT_ARBITRARY_PIN_MODE
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// LCD in 4-bit mode (default is 8 bit mode)
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//#define FOUR_BIT_MODE
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// Mode sanity check
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#if defined (EIGHT_BIT_ARBITRARY_PIN_MODE) && defined (FOUR_BIT_MODE)
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#error "EIGHT_BIT_ARBITRARY_PIN_MODE and FOUR_BIT_MODE are mutually exclusive. Choose one."
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#endif
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/* All mode options */
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#define LCD_RS PD2
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#define LCD_RS_PORT PORTD
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#define LCD_RS_DDR DDRD
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#define LCD_RW PD3
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#define LCD_RW_PORT PORTD
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#define LCD_RW_DDR DDRD
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#define LCD_ENABLE PD4
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#define LCD_ENABLE_PORT PORTD
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#define LCD_ENABLE_DDR DDRD
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/* Mode specific settings */
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// Default Mode
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// LCD data bus PORT, PIN and DDR.
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#define LCD_DBUS_PORT PORTB
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#define LCD_DBUS_DDR DDRB
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#define LCD_DBUS_PIN PINB
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#define LCD_CTRL_PORT PORTD
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#define LCD_CTRL_DDR DDRD
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#define LCD_RS PD2
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#define LCD_RW PD3
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#define LCD_ENABLE PD4
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#define LCD_DBUS0 PB0
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#define LCD_DBUS1 PB1
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#define LCD_DBUS2 PB2
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#define LCD_DBUS3 PB3
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#define LCD_DBUS4 PB4
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#define LCD_DBUS5 PB5
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#define LCD_DBUS6 PB6
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#define LCD_DBUS7 PB7
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// This must be set in default mode to the MSB of the data lines
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#define LCD_BF PB7
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// LCD in 4 bit mode (default is 8 bit mode)
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//#define FOUR_BIT_MODE
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// LCD delays (in microseconds when unspecified)
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#define LCD_DELAY 25
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#define LCD_INIT_DELAY0 15 // milliseconds
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// EIGHT_BIT_ARBITRARY_PIN_MODE specific settings
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#ifdef EIGHT_BIT_ARBITRARY_PIN_MODE
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#define LCD_DBUS0 PB0
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#define LCD_DBUS0_PORT PORTB
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#define LCD_DBYS0_DDR DDRB
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#define LCD_DBUS0_PIN PINB
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#define LCD_DBUS1 PB1
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#define LCD_DBUS1_PORT PORTB
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#define LCD_DBUS1_DDR DDRB
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#define LCD_DBUS1_PIN PINB
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#define LCD_DBUS2 PB2
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#define LCD_DBUS2_PORT PORTB
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#define LCD_DBUS2_DDR DDRB
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#define LCD_DBUS2_PIN PINB
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#define LCD_DBUS3 PB3
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#define LCD_DBUS3_PORT PORTB
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#define LCD_DBUS3_DDR DDRB
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#define LCD_DBUS3_PIN PINB
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#define LCD_DBUS4 PB4
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#define LCD_DBUS4_PORT PORTB
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#define LCD_DBUS4_DDR DDRB
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#define LCD_DBUS4_PIN PINB
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#define LCD_DBUS5 PB5
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#define LCD_DBUS5_PORT PORTB
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#define LCD_DBUS5_DDR DDRB
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#define LCD_DBUS5_PIN PINB
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#define LCD_DBUS6 PB6
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#define LCD_DBUS6_PORT PORTB
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#define LCD_DBUS6_DDR DDRB
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#define LCD_DBUS6_PIN PINB
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#define LCD_DBUS7 PB7
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#define LCD_DBUS7_PORT PORTB
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#define LCD_DBUS7_DDR DDRB
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#define LCD_DBUS7_PIN PINB
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#endif
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// FOUR_BIT_MODE specific settings
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#ifdef FOUR_BIT_MODE
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#define LCD_DBUS4 PB4
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#define LCD_DBUS4_PORT PORTB
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#define LCD_DBUS4_DDR DDRB
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#define LCD_DBUS4_PIN PINB
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#define LCD_DBUS5 PB5
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#define LCD_DBUS5_PORT PORTB
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#define LCD_DBUS5_DDR DDRB
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#define LCD_DBUS5_PIN PINB
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#define LCD_DBUS6 PB6
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#define LCD_DBUS6_PORT PORTB
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#define LCD_DBUS6_DDR DDRB
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#define LCD_DBUS6_PIN PINB
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#define LCD_DBUS7 PB7
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#define LCD_DBUS7_PORT PORTB
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#define LCD_DBUS7_DDR DDRB
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#define LCD_DBUS7_PIN PINB
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#endif
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#if defined (FOUR_BIT_MODE) || defined (EIGHT_BIT_ARBITRARY_PIN_MODE)
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#undef LCD_BF
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#define LCD_BF LCD_DBUS7
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#endif
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/* LCD delays (in microseconds when unspecified) */
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#define LCD_ENABLE_HIGH_DELAY 25
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#define LCD_ENABLE_LOW_DELAY 25
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#define LCD_INIT_DELAY0 15000
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#define LCD_INIT_DELAY1 8200
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#define LCD_INIT_DELAY2 200
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@ -59,6 +165,7 @@
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#define LCD_RETURN_HOME_DELAY 16000
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#define LCD_GENERIC_INSTR_DELAY 50
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/* LCD Commands */
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// Simple commands with no options
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@ -110,15 +217,21 @@ void clkLCD(void);
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void loop_until_LCD_BF_clear(void);
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void writeLCDInstr_(uint8_t instr);
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#ifdef FOUR_BIT_MODE
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void writeLCDNibble_(uint8_t);
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#endif
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void writeLCDInstr(uint8_t instr);
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void writeLCDByte_(uint8_t);
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void writeCharToLCD_(char c);
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void writeLCDInstr_(uint8_t);
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void writeCharToLCD(char c);
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void writeLCDInstr(uint8_t);
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void writeStringToLCD(const char* str);
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void writeCharToLCD_(char);
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void writeCharToLCD(char);
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void writeStringToLCD(const char*);
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void clearDisplay(void);
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