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author
Tim Essig
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First working prototype(one universe output)
1 parent fa181bc commit 8bba9f0

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9 files changed

+987
-174
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9 files changed

+987
-174
lines changed

‎display.c

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#include "display.h"
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#include <avr/io.h>
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#include <avr/interrupt.h>
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#include <util/delay.h>
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#define Takt_TWI 400000
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#define TWI_BAUD(F_SYS, F_TWI) ((F_SYS / (2 * F_TWI)) - 5)
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#define TWI_BAUDRATE TWI_BAUD(F_CPU, Takt_TWI)
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uint8_t displayfunction = 0x00;
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uint8_t displaycontrol = 0x00;
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uint8_t displaymode = 0x00;
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uint8_t backlightVal = LCD_BACKLIGHT;
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void setupTWI(void) {
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TWIC.MASTER.BAUD = TWI_BAUDRATE;
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TWIC.MASTER.CTRLA = TWI_MASTER_WIF_bm | TWI_MASTER_ENABLE_bm | TWI_MASTER_INTLVL_gm; //Enable Write Interupt Flag, Enable Master, Interrupt Level 0
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//RESET Bus State
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TWIC.MASTER.STATUS = TWI_MASTER_BUSSTATE_IDLE_gc;
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}
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void twiWrite(unsigned char byte) {
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TWIC.MASTER.ADDR = LCD_ADDR;
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while((TWIC.MASTER.STATUS & TWI_MASTER_WIF_bm) == 0);
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TWIC.MASTER.DATA = byte;
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while((TWIC.MASTER.STATUS & TWI_MASTER_WIF_bm) == 0);
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}
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void writeStr(char value[]) {
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while(*value != 0) {
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send(*value++, Rs);
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}
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}
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void writeInt(uint8_t value) {
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char str[4];
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itoa(value, str, 10);
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writeStr(str);
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}
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void write(uint8_t value) {
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send(value, Rs);
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}
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void writeDirect(uint8_t b) {
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twiWrite(b | backlightVal);
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}
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void pulseEnable(uint8_t _data){
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writeDirect(_data | En); // En high
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_delay_ms(1); // enable pulse must be >450ns
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writeDirect(_data & ~En); // En low
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_delay_ms(1); // commands need > 37us to settle
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}
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void write4bits(uint8_t data) {
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writeDirect(data);
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pulseEnable(data);
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}
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void send(uint8_t value, uint8_t mode) {
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uint8_t highnib=value&0xf0;
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uint8_t lownib=(value<<4)&0xf0;
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write4bits((highnib)|mode);
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write4bits((lownib)|mode);
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}
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void command(uint8_t value) {
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send(value, 0);
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}
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/**
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* Setup the Display
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*/
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void setupDisplay(void) {
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displayfunction = LCD_4BITMODE | LCD_2LINE | LCD_5x8DOTS;
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//put the LCD into 4 bit mode
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// this is according to the hitachi HD44780 datasheet
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// figure 24, pg 46
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//_delay_ms(1000);
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// we start in 8bit mode, try to set 4 bit mode
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write4bits(0x03 << 4);
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_delay_ms(5); // wait min 4.1ms
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// second try
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write4bits(0x03 << 4);
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_delay_ms(5); // wait min 4.1ms
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// third go!
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write4bits(0x03 << 4);
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_delay_ms(1);
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// finally, set to 4-bit interface
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write4bits(0x02 << 4);
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// set # lines, font size, etc.
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command(LCD_FUNCTIONSET | displayfunction);
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// turn the display on with no cursor or blinking default
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displaycontrol = LCD_DISPLAYON | LCD_CURSOROFF | LCD_BLINKOFF;
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command(LCD_DISPLAYCONTROL | displaycontrol);
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command(LCD_CLEARDISPLAY);// clear display, set cursor position to zero
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_delay_ms(20); // this command takes a long time!
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// Initialize to default text direction (for roman languages)
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displaymode = LCD_ENTRYLEFT | LCD_ENTRYSHIFTDECREMENT;
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// set the entry mode
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command(LCD_ENTRYMODESET | displaymode);
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command(LCD_RETURNHOME); // set cursor position to zero
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_delay_ms(20); // this command takes a long time!
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backlightVal = LCD_BACKLIGHT;
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}
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void setCursor(uint8_t col, uint8_t row) {
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int numlines = 2;
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int row_offsets[] = { 0x00, 0x40, 0x14, 0x54 };
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if ( row > numlines ) {
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row = numlines-1; // we count rows starting w/0
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}
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command(LCD_SETDDRAMADDR | (col + row_offsets[row]));
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}
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void clearDisplay(void) {
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command(LCD_CLEARDISPLAY);// clear display, set cursor position to zero
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_delay_ms(20); // this command takes a long time!
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}

‎display.h

Lines changed: 22 additions & 5 deletions
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#define DISPLAY_ADDR 0x3F
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#ifndef _DISPLAY_H
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#define _DISPLAY_H 1
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#include <avr/io.h>
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#include <avr/interrupt.h>
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#include <util/delay.h>
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#define LCD_ADDR (0x3F << 1)
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// commands
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#define LCD_CLEARDISPLAY 0x01
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#define Rs 1 << 0 // B00000001 // Register select bit
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4958

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uint8_t displayfunction = 0x00;
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uint8_t displaycontrol = 0x00;
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uint8_t displaymode = 0x00;
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uint8_t backlightVal = LCD_BACKLIGHT;
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extern void setupTWI(void);
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extern void twiWrite(unsigned char byte);
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extern void writeStr(char* value);
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extern void writeInt(uint8_t value);
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extern void write(uint8_t value);
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extern void setupDisplay(void);
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extern void setCursor(uint8_t col, uint8_t row);
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extern void clearDisplay(void);
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#endif

‎dmx.c

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#include "dmx.h"
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#include <avr/io.h>
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#include <avr/interrupt.h>
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#include <util/delay.h>
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uint8_t dmxBuffer[DMX_NUM_UNIVERSES][DMX_UNIVERSE_SIZE];
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uint8_t* getUniverseBuffer(uint8_t universe) {
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return dmxBuffer[universe];
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}
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enum DMX_STATE {
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DMX_IDLE,
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DMX_BREAK,
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DMX_START,
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DMX_RUN
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};
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enum DMX_STATE dmx0state = DMX_IDLE;
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enum DMX_STATE dmx1state = DMX_IDLE;
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enum DMX_STATE dmx2state = DMX_IDLE;
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enum DMX_STATE dmx3state = DMX_IDLE;
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uint16_t dmx0ch = 0;
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uint16_t dmx1ch = 0;
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uint16_t dmx2ch = 0;
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uint16_t dmx3ch = 0;
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#define DMX_BAUD_BSCALE 0 // vorher 0b1001 -> -1
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#define DMX_BAUD_RESET_BSEL 15 // 125k BAUD @32Mhz, used for RESET
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#define DMX_BAUD_NORMAL_BSEL 7 // 250k BAUD @32Mhz
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#define UART0 USARTD0
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void setupDMXPort(USART_t* uart) {
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uart->BAUDCTRLB = DMX_BAUD_BSCALE << 4;
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uart->BAUDCTRLA = DMX_BAUD_RESET_BSEL;
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uart->CTRLA = USART_TXCINTLVL_gm; // TX Highest INT Level
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uart->CTRLC = USART_SBMODE_bm | USART_CHSIZE_8BIT_gc; //2 StopBits, 8 DataBits
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uart->CTRLB = USART_TXEN_bm; //Enable TX
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}
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void setupDMX(void) {
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//DMX 3
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PORTD.DIRSET = PIN3_bm; // Pin 3 -> UART 0 TX
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PORTD.PIN3CTRL = PORT_INVEN_bm;
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setupDMXPort(&USARTD0);
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//DMX 4
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PORTE.DIRSET = PIN3_bm; // Pin 3 -> UART 0 TX
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PORTE.PIN3CTRL = PORT_INVEN_bm;
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setupDMXPort(&USARTE0);
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}
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void startDMX_TX(void) {
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if(dmx0state == DMX_IDLE) {
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PORTA.OUTSET = 0x01;
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//Set Baud
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UART0.BAUDCTRLA = DMX_BAUD_RESET_BSEL;
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UART0.BAUDCTRLB = DMX_BAUD_BSCALE << 4;
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//Send Break Byte
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while (!( UART0.STATUS & USART_DREIF_bm));
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UART0.DATA = 0x00;
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dmx0state = DMX_START;
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}
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}
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ISR(USARTD0_TXC_vect) //Transimission complete
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{
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switch(dmx0state) {
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case DMX_START:
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//Change Baudrate
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UART0.BAUDCTRLA = DMX_BAUD_NORMAL_BSEL;
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UART0.BAUDCTRLB = DMX_BAUD_BSCALE << 4;
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//SEND START Byte
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UART0.DATA = 0x00;
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dmx0ch = 0;
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dmx0state = DMX_RUN;
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break;
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case DMX_RUN:
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PORTA.OUTSET = 0x02;
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UART0.DATA = dmxBuffer[0][dmx0ch++];
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if(dmx0ch >= 512) {
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dmx0state = DMX_IDLE;
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PORTA.OUTCLR = 0x03;
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//_delay_ms(500);
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}
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break;
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}
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}

‎dmx.h

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#ifndef _DMX_H
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#define _DMX_H 1
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#include <avr/io.h>
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#define DMX_NUM_UNIVERSES 4
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#define DMX_UNIVERSE_SIZE 512
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extern uint8_t dmxBuffer[DMX_NUM_UNIVERSES][DMX_UNIVERSE_SIZE];
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extern uint8_t* getUniverseBuffer(uint8_t universe);
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extern void setupDMX(void);
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extern void startDMX_TX(void);
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//extern void startDMX_TX(void);
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#endif

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