22 files changed, 644 insertions, 153 deletions

diff --git a/.gitignore b/.gitignore
index 23cb2e2..6ce0290 100644
--- a/.gitignore
+++ b/.gitignore
@@ -13,33 +13,33 @@ doc/**/*.log
 
 ## sw related
 # autotools
-sw/linux/**/makefile
-sw/linux/**/makefile.in
-sw/linux/**/ar-lib
-sw/linux/**/mdate-sh
-sw/linux/**/py-compile
-sw/linux/**/test-driver
-sw/linux/**/ylwrap
-sw/linux/**/autom4te.cache
-sw/linux/**/autoscan.log
-sw/linux/**/autoscan-*.log
-sw/linux/**/aclocal.m4
-sw/linux/**/compile
-sw/linux/**/config.guess
-sw/linux/**/config.h.in
-sw/linux/**/config.log
-sw/linux/**/config.status
-sw/linux/**/config.sub
-sw/linux/**/configure
-sw/linux/**/configure.scan
-sw/linux/**/depcomp
-sw/linux/**/install-sh
-sw/linux/**/missing
-sw/linux/**/stamp-h*
-sw/linux/**/build-aux
-sw/linux/**/ltmain.sh
-sw/linux/**/texinfo.tex
-sw/linux/**/.deps
+sw/programmer/linux/**/makefile
+sw/programmer/linux/**/makefile.in
+sw/programmer/linux/**/ar-lib
+sw/programmer/linux/**/mdate-sh
+sw/programmer/linux/**/py-compile
+sw/programmer/linux/**/test-driver
+sw/programmer/linux/**/ylwrap
+sw/programmer/linux/**/autom4te.cache
+sw/programmer/linux/**/autoscan.log
+sw/programmer/linux/**/autoscan-*.log
+sw/programmer/linux/**/aclocal.m4
+sw/programmer/linux/**/compile
+sw/programmer/linux/**/config.guess
+sw/programmer/linux/**/config.h.in
+sw/programmer/linux/**/config.log
+sw/programmer/linux/**/config.status
+sw/programmer/linux/**/config.sub
+sw/programmer/linux/**/configure
+sw/programmer/linux/**/configure.scan
+sw/programmer/linux/**/depcomp
+sw/programmer/linux/**/install-sh
+sw/programmer/linux/**/missing
+sw/programmer/linux/**/stamp-h*
+sw/programmer/linux/**/build-aux
+sw/programmer/linux/**/ltmain.sh
+sw/programmer/linux/**/texinfo.tex
+sw/programmer/linux/**/.deps
 
 # binaries
 sw/**/*.hex
diff --git a/sw/linux/src/makefile.am b/sw/linux/src/makefile.am
deleted file mode 100644
index 492c3ec..0000000
--- a/sw/linux/src/makefile.am
+++ /dev/null
@@ -1,7 +0,0 @@
-bin_PROGRAMS = z80prog
-z80prog_SOURCES = main.c ui.c serial.c
-
-z80prog_CFLAGS = -Wall -Werror -g $(gtk3_CFLAGS)
-z80prog_LDADD = $(gtk3_LIBS)
-
-CLEANFILES = *~
diff --git a/sw/linux/src/ui.c b/sw/linux/src/ui.c
deleted file mode 100644
index b33aa04..0000000
--- a/sw/linux/src/ui.c
+++ /dev/null
@@ -1,90 +0,0 @@
-#include "ui.h"
-
-static bool ui_connected, ui_fileset;
-static GtkTextBuffer *ui_logbuf;
-static GtkBuilder *ui_builder;
-
-void ui_init(int *argc, char **argv[])
-{
-    GtkWindow *window;
-    GtkTextView *logview;
-    GtkFileChooserButton *filechoosebtn;
-    GtkButton *connectbtn, *flashbtn;
-
-    /* set ui global variables */
-    ui_connected = ui_fileset = false;
-
-    /* start gtk */
-    gtk_init(argc, argv);
-
-    /* load glade gtk ui */
-    ui_builder = gtk_builder_new();
-    gtk_builder_add_from_file(ui_builder, "gbprog.ui", NULL);
-
-    /* connect logger buffer (extern variable) */
-    ui_logbuf = gtk_text_buffer_new(NULL);
-    logview = GTK_TEXT_VIEW(gtk_builder_get_object(ui_builder, "logview"));
-
-    gtk_text_view_set_buffer(logview, ui_logbuf);
-
-    /* connect objects to function calls */
-    // window
-    window = GTK_WINDOW(gtk_builder_get_object(ui_builder, "window"));
-    g_signal_connect(window, "destroy", G_CALLBACK(gtk_main_quit), NULL);
-
-    // connectbtn 
-    connectbtn = GTK_BUTTON(gtk_builder_get_object(ui_builder, "flashbtn"));
-    g_signal_connect(connectbtn, "clicked", 
-                        G_CALLBACK(ui_connect_clicked), NULL);
-
-    // flashbtn
-    flashbtn = GTK_BUTTON(gtk_builder_get_object(ui_builder, "flashbtn"));
-    g_signal_connect(flashbtn, "clicked", G_CALLBACK(ui_flash_clicked), NULL);
-
-    // file chooser
-    filechoosebtn = GTK_FILE_CHOOSER_BUTTON(
-            gtk_builder_get_object(ui_builder, "filechoosebtn"));
-    g_signal_connect(filechoosebtn, "file-set", G_CALLBACK(ui_file_set), NULL);
-
-    /* start gtk window */
-    gtk_main();
-}
-
-void ui_log(const char *msg, char type) 
-{
-    GtkTextIter end;
-    gchar typech[4] = "[ ] ";
-
-    switch (type) {
-        case 'm': typech[1] = '@'; break; // message
-        case 'w': typech[1] = '#'; break; // warning
-        case 'e': typech[1] = '!'; break; // error
-    }
-
-    gtk_text_buffer_get_end_iter(ui_logbuf, &end);
-    gtk_text_buffer_insert(ui_logbuf, &end, typech, 4);
-    gtk_text_buffer_get_end_iter(ui_logbuf, &end);
-    gtk_text_buffer_insert(ui_logbuf, &end, (const gchar *) msg, strlen(msg));
-}
-
-void ui_file_set(GtkFileChooserButton *btn, gpointer user_data)
-{
-    GtkEntry *filepath = 
-            GTK_ENTRY(gtk_builder_get_object(ui_builder, "filepath"));
-
-    gtk_entry_set_text(filepath, 
-            gtk_file_chooser_get_filename(GTK_FILE_CHOOSER(btn)));
-
-    ui_log("File set\n", 'm');
-    ui_fileset = true;
-}
-
-void ui_connect_clicked(void) 
-{
-
-}
-
-void ui_flash_clicked(void)
-{
-
-}
diff --git a/sw/linux/src/z80prog b/sw/linux/src/z80prog
deleted file mode 100755
index 878683b..0000000
--- a/sw/linux/src/z80prog
+++ /dev/null
diff --git a/sw/programmer/avr/main.c b/sw/programmer/avr/main.c
new file mode 100644
index 0000000..9cdc35d
--- /dev/null
+++ b/sw/programmer/avr/main.c
@@ -0,0 +1,119 @@
+#include "usart.h"
+
+#include <stdio.h>
+#include <util/delay.h>
+
+#define EEPROM_TICK_MS  10
+
+#define ADDRCR      PORTB
+#define EEPROMCR    PORTC
+#define EEPROMDR    PORTD
+
+#define ADDR_BIT    0
+#define ADDR_EL     3
+#define ADDR_EH     4
+#define ADDR_DL     5
+#define ADDR_DH     6
+
+#define EEPROM_WR   0
+#define EEPROM_RD   1
+#define EEPROM_CLK  2
+
+struct file_blk
+{
+    uint16_t addr;
+    uint16_t size;
+};
+
+void eeprom_write(uint16_t addr, uint8_t byte);
+void eeprom_tick();
+
+int main(void)
+{
+    uint8_t *buffer, i;
+    size_t read;
+    char str[64];
+
+    struct file_blk *blk = malloc(sizeof(struct file_blk));
+
+    DDRB = 0x7F;
+    DDRC = 0x83;
+    DDRD = 0xFC;
+
+    /* get configuration */
+    usart_init(1200); 
+    usart_print("programmer Ready\n<waiting for binary>\n\r");
+
+    while (usart_read((uint8_t *) blk, sizeof(struct file_blk))) {
+        buffer = malloc(blk->size);
+        read = usart_read(buffer, blk->size);
+
+#ifdef DEBUG
+        sprintf(str, "info : reading block from addr %d of size %d\n\r", 
+                blk->addr, blk->size);
+        usart_print(str);
+
+        if (read != blk->size) {
+            sprintf(str, "error: expected %d but read %d\n\r", 
+                    blk->size, read);
+            usart_print(str);
+        }
+#endif
+
+        for (i = 0; i < read; i++) {
+            eeprom_write(blk->addr +i, buffer[i]);
+        }
+
+        free(buffer);
+    }
+
+    free(blk);
+    return 0;
+}
+
+
+void eeprom_write(uint16_t addr, uint8_t byte)
+{
+    int bit;
+
+    /* set address */
+    for (bit = 0; bit < 8; bit++) {
+        // clear bit
+        ADDRCR &= ~0x07;
+        // select the bit
+        ADDRCR |= bit;
+
+        // write bit for lower byte
+        if (addr & _BV(bit))
+            ADDRCR |= _BV(ADDR_DL);
+        else
+            ADDRCR &= ~_BV(ADDR_DL);
+
+        // write bit for higher byte
+        if ((addr>>8) & _BV(bit))
+            ADDRCR |= _BV(ADDR_DH);
+        else
+            ADDRCR &= ~_BV(ADDR_DH);
+    }
+
+    /* set data */
+    EEPROMDR = byte;
+    EEPROMCR &= ~(_BV(ADDR_EH) | _BV(ADDR_EL));
+
+    /* write eeprom */
+    EEPROMCR &= ~_BV(EEPROM_WR);
+    eeprom_tick();
+
+    EEPROMCR |= _BV(EEPROM_WR);
+    EEPROMCR |= _BV(ADDR_EH) | _BV(ADDR_EL);
+}
+
+/* pulse the clock line for the eeprom */
+void eeprom_tick()
+{
+    EEPROMCR |= _BV(EEPROM_CLK);
+    _delay_ms(EEPROM_TICK_MS);         
+    EEPROMCR &= ~_BV(EEPROM_CLK);
+    _delay_ms(EEPROM_TICK_MS);         
+}
+
diff --git a/sw/programmer/avr/makefile b/sw/programmer/avr/makefile
new file mode 100644
index 0000000..ba2a709
--- /dev/null
+++ b/sw/programmer/avr/makefile
@@ -0,0 +1,31 @@
+###
+# Project settings
+#
+TARGET := programmer
+SOURCES := $(wildcard *.c)
+
+###
+# Compiler settings
+#
+CC   := avr-gcc
+PORT := /dev/ttyUSB0
+MCU  := atmega328p
+
+CFLAGS  := -g -Wall -mcall-prologues -mmcu=$(MCU) -Os -I . \
+			-DF_CPU=1000000UL -DDEBUG
+LDFLAGS := -Wl,-gc-sections -Wl,-relax
+
+.PHONY: all clean program
+all: $(TARGET).hex
+
+clean:
+	rm -f *.o *.hex *.obj *.bin
+
+$(TARGET).hex: $(TARGET).bin
+	avr-objcopy -R .eeprom -O ihex $(TARGET).bin $@
+
+$(TARGET).bin: $(SOURCES)
+	$(CC) $(CFLAGS) $(SOURCES) -o $@ $(LDFLAGS)
+
+program: $(TARGET).hex
+	avrdude -p $(MCU) -c usbasp -P usb -U flash:w:$(TARGET).hex
diff --git a/sw/programmer/avr/usart.c b/sw/programmer/avr/usart.c
new file mode 100644
index 0000000..8c2eb38
--- /dev/null
+++ b/sw/programmer/avr/usart.c
@@ -0,0 +1,107 @@
+#include "usart.h"
+
+static uint16_t usart_baudrate;
+static uint16_t usart_baud_prescale;
+
+void usart_init(uint16_t baudrate)
+{
+    // enable RX and TX
+    UCSR0B |= _BV(RXEN0) | _BV(TXEN0);
+    
+    // set 8 bit size char
+    UCSR0C |= _BV(UCSZ01) | _BV(UCSZ00);
+
+    // set baudrate 
+    usart_baudrate = baudrate;
+    usart_baud_prescale = (F_CPU / (usart_baudrate * 16)) -1;
+    
+    UBRR0L = usart_baud_prescale;
+    UBRR0H = usart_baud_prescale >> 8;
+}
+
+void usart_send_byte(uint8_t data)
+{
+    while (!(UCSR0A & _BV(UDRE0)));
+    UDR0 = data;
+}
+
+void usart_send(uint8_t *data, size_t len)
+{
+    uint8_t *p = data;
+
+    while (len--) {
+        usart_send_byte(*(p++));
+    }
+}
+
+void usart_print(char *str)
+{
+    char *p = str;
+    size_t len = 0;
+
+    while (*p++ != '\0') {
+        len++;
+    }
+
+    usart_send((uint8_t *) str, len);
+}
+
+int usart_read_byte(uint8_t *byte)
+{
+    uint16_t timeout = USART_TIMEOUT;
+
+    do {
+        if (UCSR0A & _BV(RXC0)) {
+            *byte = UDR0;
+            return 0;
+        }
+    } while (timeout--);
+
+    return -1;
+}
+
+uint8_t usart_read_byte_nt(void)
+{
+    while ((UCSR0A & _BV(RXC0)) == 0);
+    return UDR0;
+}
+
+
+size_t usart_read(uint8_t *buffer, size_t len)
+{
+    size_t read = 0;
+    uint8_t *p = buffer;
+
+    while (len--) {
+        if (usart_read_byte(p)  == 0) {
+            p++; 
+            read++;
+        }
+    }
+
+    return read;
+}
+
+int usart_read_line(uint8_t *buffer, size_t len)
+{
+    uint8_t ch;
+    uint8_t *p = buffer;
+    size_t read = 0;
+
+    while (len--) {
+        if (usart_read_byte(&ch) != 0)
+            continue;
+        else
+            read++;
+
+        if (ch == '\n')
+            break;
+        else
+            *(p++) = ch;
+    }
+
+    if (ch != '\n')
+        return -1;
+
+    return 0;
+}
diff --git a/sw/programmer/avr/usart.h b/sw/programmer/avr/usart.h
new file mode 100644
index 0000000..1bb6607
--- /dev/null
+++ b/sw/programmer/avr/usart.h
@@ -0,0 +1,96 @@
+#ifndef __USART_H__
+#define __USART_H__
+/*** 
+ * USART REGISTERS {{{
+ *
+ * UCSR: control and status regisers, composed from 3 registers:
+ *  +------------------------------------------------------------------------+
+ *  | UCSRA :| RXC   | TXC   | UDRE  | FE    | DOR   | PE    | U2X   | MPCM  | 
+ *  +------------------------------------------------------------------------+
+ *   UCSRA is a status register (read only)
+ *   Relevant bits:
+ *       - RXC : set to 1 if data is present on the receive buffer
+ *       - TXC : set to 1 when data is transferred to the transfer register 
+ *       - UDRE: set to 1 when trasmit buffer is empty (data sent)
+ *  +------------------------------------------------------------------------+
+ *  | UCSRB :| RXCIE | TXCIE | UDRIE | RXEN  | TXEN  | UCSZ2 | RXB8  | TXB8  | 
+ *  +------------------------------------------------------------------------+
+ *   UCSRB is used to setup hardware configuration
+ *   Relevant bits:
+ *       - RXCIE: RX complete interrupt enabled when set to 1
+ *       - TXCIE: TX complete interrupt enabled when set to 1
+ *       - UDRIE: data register empty interrupt enabled when set to 1
+ *       - RXEN : uart receiver enabled  when set to 1
+ *       - TXEN : uart transmitter enabled when set to 1
+ *  +------------------------------------------------------------------------+
+ *  | UCSRC :| URSEL | UMSEL | UPM1  | UPM0  | USBS  | UCSZ1 | UCSZ0 | UCPOL | 
+ *  +------------------------------------------------------------------------+
+ *   UCSRB is used to setup protocol configuration
+ *   Relevant bits:
+ *       - URSEL: register select (location is shared with UBRRH and UCSRC)
+ *       - UMSEL: mode select
+ *              1 -> synchronous
+ *              0 -> asynchronous
+ *       - UMP1 + UPM0: set parity
+ *              00 -> no parity
+ *              01 -> reserved
+ *              10 -> even
+ *              11 -> odd
+ *       - UCSZ2 + UCSZ1 + UCSZ0: set data frame (char size)
+ *              000 -> 5 bit
+ *              001 -> 6 bit
+ *              010 -> 7 bit
+ *              011 -> 8 bit
+ *              100 to 110 -> reserved
+ *              111 -> 9 bit
+ *
+ * UBRR: baudrate register
+ *  +------------------------------------------------------------------------+
+ *  | UBRRH :| URSEL |       |       |       | UBRR11| UBRR10| UBRR9 | UBRR8 | 
+ *  +------------------------------------------------------------------------+
+ *  | UBRRL :| UBRR7 | UBRR6 | UBRR5 | UBRR4 | UBRR3 | UBRR2 | UBRR1 | UBRR0 | 
+ *  +------------------------------------------------------------------------+
+ *    UBRR is composed of 2 8 bit registers to store a 12 bit baudrate value.
+ *    The value to be stored in this register is calculated with the following
+ *    formula (approximate to integer):
+ *       UBRR = ( XTAL_frequency ) / ( 16 * BAUDRATE ) -1
+ *
+ *    in C code corresponds to:
+ *       #define USART_BAUDRATE 9600
+ *       #define BAUD_PRESCALE (((F_CPU / (USART_BAUDRATE * 16UL))) - 1)
+ *
+ *    Relevant bits:
+ *       - URSEL: register select (location is share with UCSRC)
+ *
+ * UDR : data register
+ *   This register is shared between RX and TX
+ *
+ * }}}
+ */
+
+#include <stdint.h>
+#include <stdlib.h>
+
+#include <avr/io.h>
+
+#define USART_TIMEOUT   5000
+
+// struct usart_conf
+// {
+//     uint16_t baudrate;
+// };
+
+void usart_init(uint16_t baudrate);
+// void usart_init_conf(struct usart_conf *conf);
+
+void usart_send_byte(uint8_t data);
+void usart_send(uint8_t *data, size_t len);
+
+void usart_print(char *str);
+
+int usart_read_byte(uint8_t *byte);
+uint8_t usart_read_byte_nt(void);
+size_t usart_read(uint8_t *buffer, size_t len);
+int uart_read_line(uint8_t *buffer, size_t len);
+
+#endif
diff --git a/sw/linux/config.h b/sw/programmer/linux/config.h
index d319f43..d319f43 100644
--- a/sw/linux/config.h
+++ b/sw/programmer/linux/config.h
diff --git a/sw/linux/configure.ac b/sw/programmer/linux/configure.ac
index a5c4b3b..a5c4b3b 100644
--- a/sw/linux/configure.ac
+++ b/sw/programmer/linux/configure.ac
diff --git a/sw/linux/makefile.am b/sw/programmer/linux/makefile.am
index 4d27cea..4d27cea 100644
--- a/sw/linux/makefile.am
+++ b/sw/programmer/linux/makefile.am
diff --git a/sw/linux/reading_links.txt b/sw/programmer/linux/reading_links.txt
index 83c62f4..83c62f4 100644
--- a/sw/linux/reading_links.txt
+++ b/sw/programmer/linux/reading_links.txt
diff --git a/sw/programmer/linux/src/flash.c b/sw/programmer/linux/src/flash.c
new file mode 100644
index 0000000..48189da
--- /dev/null
+++ b/sw/programmer/linux/src/flash.c
@@ -0,0 +1,59 @@
+#include "flash.h"
+
+static int flash_serial_fd = -1;
+
+int flash_open(const char *path, unsigned long baudrate)
+{
+	flash_serial_fd = serial_open(path, baudrate);
+
+	if (flash_serial_fd < 0)
+		return -1;
+
+	return 0;
+}
+
+int flash_write(const char *romfile, void (*log)(const char *))
+{
+	int romfd;
+	ssize_t written;
+
+	struct stat romst;
+	struct flash_blk head;
+
+	uint8_t *buffer = malloc(FLASH_BLOCK_SIZE);
+
+	romfd = open(romfile, O_RDONLY);
+
+	if (fstat(romfd, &romst) != 0)
+		goto exit_romfd;
+
+	while ((head.size = read(romfd, buffer, FLASH_BLOCK_SIZE))) {
+		head.addr = (uint16_t) lseek(romfd, 0, SEEK_CUR);
+
+		written = write(flash_serial_fd, &head, sizeof(struct flash_blk));
+		if (written < 0) {
+			// error
+		}
+
+		written = write(flash_serial_fd, buffer, head.size);		
+		if (written < 0) {
+			// error
+		}
+
+		char logbuf[64];
+		sprintf(logbuf, "[@] Written %d bytes at address %d\n", head.size, head.addr);
+		log(logbuf);
+	}
+
+exit_romfd:
+	close(romfd);
+
+	free(buffer);
+	return 0;
+}
+
+void flash_close(void)
+{
+	if (flash_serial_fd >= 0) 
+		close(flash_serial_fd);
+}
\ No newline at end of file
diff --git a/sw/programmer/linux/src/flash.h b/sw/programmer/linux/src/flash.h
new file mode 100644
index 0000000..373ebf3
--- /dev/null
+++ b/sw/programmer/linux/src/flash.h
@@ -0,0 +1,22 @@
+#ifndef __FLASH_H__
+#define __FLASH_H__
+
+#include "serial.h"
+
+#include <sys/stat.h>
+#include <fcntl.h>
+#include <unistd.h>
+
+#define FLASH_BLOCK_SIZE 	512
+
+struct flash_blk
+{
+	uint16_t addr;
+	uint16_t size;
+};
+
+int flash_open(const char *devpath, unsigned long baudrate);
+int flash_write(const char *romfile, void (*log)(const char *));
+void flash_close(void);
+
+#endif
diff --git a/sw/linux/src/main.c b/sw/programmer/linux/src/main.c
index 769992a..769992a 100644
--- a/sw/linux/src/main.c
+++ b/sw/programmer/linux/src/main.c
diff --git a/sw/programmer/linux/src/makefile.am b/sw/programmer/linux/src/makefile.am
new file mode 100644
index 0000000..33ae438
--- /dev/null
+++ b/sw/programmer/linux/src/makefile.am
@@ -0,0 +1,7 @@
+bin_PROGRAMS = z80prog
+z80prog_SOURCES = main.c ui.c serial.c flash.c
+
+z80prog_CFLAGS = -Wall -g $(gtk3_CFLAGS) -pthread
+z80prog_LDADD = $(gtk3_LIBS) 
+
+CLEANFILES = *~
diff --git a/sw/linux/src/serial.c b/sw/programmer/linux/src/serial.c
index 564676b..e2544be 100644
--- a/sw/linux/src/serial.c
+++ b/sw/programmer/linux/src/serial.c
@@ -1,6 +1,6 @@
 #include "serial.h"
 
-int serial_connect(const char *devpath, long baudrate)
+int serial_open(const char *devpath, unsigned long baudrate)
 {
     int fd;
     struct termios tty;
@@ -40,3 +40,4 @@ int serial_connect(const char *devpath, long baudrate)
 
     return fd;
 }
+
diff --git a/sw/linux/src/serial.h b/sw/programmer/linux/src/serial.h
index 6123e42..fe21524 100644
--- a/sw/linux/src/serial.h
+++ b/sw/programmer/linux/src/serial.h
@@ -8,10 +8,6 @@
 #include <fcntl.h>
 #include <termios.h>
 
-int serial_connect(const char *devpath, long baudrate);
-void serial_close(int fd);
-
-void serial_program(const char *rompath);
-void serial_read_rom(const char *rom);
+int serial_open(const char *devpath, unsigned long baudrate);
 
 #endif
diff --git a/sw/programmer/linux/src/ui.c b/sw/programmer/linux/src/ui.c
new file mode 100644
index 0000000..87dc0c7
--- /dev/null
+++ b/sw/programmer/linux/src/ui.c
@@ -0,0 +1,142 @@
+#include "ui.h"
+
+static bool ui_connected, ui_fileset;
+static GtkBuilder *ui_builder;
+
+void ui_init(int *argc, char **argv[])
+{
+    GtkWindow *window;
+    GtkFileChooserButton *filechoosebtn;
+    GtkButton *connectbtn, *flashbtn;
+
+    ui_connected = ui_fileset = false;
+
+    gtk_init(argc, argv);
+
+    ui_builder = gtk_builder_new();
+    gtk_builder_add_from_file(ui_builder, "z80prog.ui", NULL);
+
+    /* connect objects to callbacks */
+    window = GTK_WINDOW(gtk_builder_get_object(ui_builder, "window"));
+    g_signal_connect(window, "destroy", G_CALLBACK(gtk_main_quit), NULL);
+
+    connectbtn = GTK_BUTTON(gtk_builder_get_object(ui_builder, "connectbtn"));
+    g_signal_connect(connectbtn, "clicked", G_CALLBACK(ui_connect_clicked), NULL);
+
+    flashbtn = GTK_BUTTON(gtk_builder_get_object(ui_builder, "flashbtn"));
+    g_signal_connect(flashbtn, "clicked", G_CALLBACK(ui_flash_clicked), NULL);
+
+    filechoosebtn = GTK_FILE_CHOOSER_BUTTON(gtk_builder_get_object(ui_builder, "filechoosebtn"));
+    g_signal_connect(filechoosebtn, "file-set", G_CALLBACK(ui_file_set), NULL);
+
+    /* start gtk window */
+    gtk_main();
+}
+
+void ui_log(const char *msg) 
+{
+    GtkTextIter end;
+    GtkTextView *ui_log;
+
+    static GtkTextBuffer *ui_logbuf = NULL; 
+
+    ui_log = GTK_TEXT_VIEW(gtk_builder_get_object(ui_builder, "logview"));
+
+    if (ui_logbuf == NULL) {
+        ui_logbuf = gtk_text_buffer_new(NULL);
+        gtk_text_view_set_buffer(ui_log, ui_logbuf);
+    }
+
+    gtk_text_buffer_get_end_iter(ui_logbuf, &end);
+    gtk_text_buffer_insert(ui_logbuf, &end, msg, -1);
+    gtk_text_view_scroll_to_iter(ui_log, &end, .0, TRUE, .0, .1);
+}
+
+void ui_check_enable_flashbtn(void)
+{
+    GtkWidget *ui_flashbtn = GTK_WIDGET(gtk_builder_get_object(ui_builder, "flashbtn"));
+
+    if (ui_connected && ui_fileset) 
+        gtk_widget_set_sensitive(ui_flashbtn, TRUE);
+    else
+        gtk_widget_set_sensitive(ui_flashbtn, FALSE); 
+}
+
+void ui_file_set(GtkFileChooserButton *btn, gpointer user_data)
+{
+    GtkEntry *filepath = GTK_ENTRY(gtk_builder_get_object(ui_builder, "filepath"));
+
+    gtk_entry_set_text(filepath, gtk_file_chooser_get_filename(GTK_FILE_CHOOSER(btn)));
+    ui_log(UI_LOG_MSG "file set\n");
+    ui_fileset = true;
+
+    ui_check_enable_flashbtn();
+}
+
+void ui_connect_clicked(void) 
+{
+    GtkEntry *ui_devpath = GTK_ENTRY(gtk_builder_get_object(ui_builder, "devpath"));
+    GtkSpinButton *ui_baudrate = GTK_SPIN_BUTTON(gtk_builder_get_object(ui_builder, "devbaudrate"));
+    GtkButton *ui_connectbtn = GTK_BUTTON(gtk_builder_get_object(ui_builder, "connectbtn"));
+
+    unsigned long baudrate = gtk_spin_button_get_value_as_int(ui_baudrate);
+    const char *devpath = gtk_entry_get_text(ui_devpath);
+
+    if (flash_open(devpath, baudrate) != 0) {
+        ui_log(UI_LOG_ERR "failed to open serial device\n");
+    } else {
+        ui_connected = true;
+        ui_log(UI_LOG_MSG "connected to serial device ");
+        ui_log(devpath);
+        ui_log("\n");
+
+        g_signal_handlers_disconnect_by_func(ui_connectbtn, G_CALLBACK(ui_connect_clicked), NULL);
+        g_signal_connect(ui_connectbtn, "clicked", G_CALLBACK(ui_disconnect_clicked), NULL);
+
+        gtk_button_set_label(ui_connectbtn, "gtk-disconnect");
+        ui_check_enable_flashbtn();
+    }
+}
+
+void ui_disconnect_clicked(void)
+{
+    GtkButton *ui_connectbtn = GTK_BUTTON(gtk_builder_get_object(ui_builder, "connectbtn"));
+
+    flash_close();
+
+    ui_connected = false;
+    ui_log(UI_LOG_MSG "disconnected\n");
+
+    g_signal_handlers_disconnect_by_func(ui_connectbtn, G_CALLBACK(ui_disconnect_clicked), NULL);
+    g_signal_connect(ui_connectbtn, "clicked", G_CALLBACK(ui_connect_clicked), NULL);
+
+    gtk_button_set_label(ui_connectbtn, "gtk-connect");
+    ui_check_enable_flashbtn();
+}
+
+int ui_flash_write_start(void *ptr)
+{
+    const char *filepath = (const char *) ptr;
+
+    flash_write(filepath, ui_log);
+    ui_check_enable_flashbtn();
+
+    return 0;
+}
+
+void ui_flash_clicked(void)
+{
+    GtkWidget *ui_flashbtn = GTK_WIDGET(gtk_builder_get_object(ui_builder, "flashbtn"));
+    GtkEntry *ui_filepath = GTK_ENTRY(gtk_builder_get_object(ui_builder, "filepath"));
+
+    const char *filepath = gtk_entry_get_text(ui_filepath);
+
+    gdk_threads_add_idle_full(
+        G_PRIORITY_HIGH_IDLE,
+        ui_flash_write_start,
+        (void *) filepath,
+        NULL
+    );
+
+    gtk_widget_set_sensitive(ui_flashbtn, FALSE);
+}
diff --git a/sw/linux/src/ui.h b/sw/programmer/linux/src/ui.h
index 44314d6..510537a 100644
--- a/sw/linux/src/ui.h
+++ b/sw/programmer/linux/src/ui.h
@@ -1,17 +1,24 @@
 #ifndef __Z80PROG_UI_H__
 #define __Z80PROG_UI_H_
 
+#include "flash.h"
+
 #include <stdbool.h>
 #include <string.h>
 
 #include <gtk/gtk.h>
 
+#define UI_LOG_ERR	"[!] "
+#define UI_LOG_WARN	"[#] "
+#define UI_LOG_MSG	"[@] "
+
 void ui_init(int *argc, char **argv[]);
-void ui_log(const char *msg, char type);
+void ui_log(const char *msg);
+void ui_check_enable_flashbtn(void);
 
 void ui_file_set(GtkFileChooserButton *btn, gpointer user_data);
-
 void ui_connect_clicked(void);
+void ui_disconnect_clicked(void);
 void ui_flash_clicked(void);
 
 #endif
diff --git a/sw/programmer/linux/src/z80prog b/sw/programmer/linux/src/z80prog
new file mode 100755
index 0000000..2f0d230
--- /dev/null
+++ b/sw/programmer/linux/src/z80prog
diff --git a/sw/linux/src/z80prog.ui b/sw/programmer/linux/src/z80prog.ui
index 3735efa..6c652ec 100644
--- a/sw/linux/src/z80prog.ui
+++ b/sw/programmer/linux/src/z80prog.ui
@@ -44,7 +44,8 @@
               <object class="GtkEntry" id="devpath">
                 <property name="visible">True</property>
                 <property name="can_focus">True</property>
-                <property name="placeholder_text" translatable="yes">Enter path</property>
+                <property name="text" translatable="yes">/dev/tty</property>
+                <property name="placeholder_text" translatable="yes">Enter device path</property>
               </object>
               <packing>
                 <property name="expand">True</property>
@@ -59,14 +60,14 @@
                 <property name="width_chars">0</property>
                 <property name="max_width_chars">7</property>
                 <property name="overwrite_mode">True</property>
-                <property name="placeholder_text" translatable="yes">9600</property>
+                <property name="placeholder_text" translatable="yes">1200</property>
                 <property name="input_purpose">number</property>
                 <property name="adjustment">baudrateadjust</property>
                 <property name="climb_rate">10</property>
                 <property name="snap_to_ticks">True</property>
                 <property name="numeric">True</property>
                 <property name="update_policy">if-valid</property>
-                <property name="value">9600</property>
+                <property name="value">1200</property>
               </object>
               <packing>
                 <property name="expand">False</property>
@@ -104,7 +105,7 @@
               <object class="GtkEntry" id="filepath">
                 <property name="visible">True</property>
                 <property name="can_focus">True</property>
-                <property name="placeholder_text" translatable="yes">Binary Path</property>
+                <property name="placeholder_text" translatable="yes">Enter binary path</property>
               </object>
               <packing>
                 <property name="expand">True</property>
@@ -173,21 +174,21 @@
           </packing>
         </child>
         <child>
-          <object class="GtkScrolledWindow" id="logscrolled">
+          <object class="GtkViewport" id="logviewport">
             <property name="visible">True</property>
-            <property name="can_focus">True</property>
-            <property name="shadow_type">in</property>
+            <property name="can_focus">False</property>
             <child>
-              <object class="GtkViewport" id="logviewport">
+              <object class="GtkExpander" id="logexpander">
                 <property name="visible">True</property>
-                <property name="can_focus">False</property>
+                <property name="can_focus">True</property>
+                <property name="expanded">True</property>
+                <property name="label_fill">True</property>
+                <property name="resize_toplevel">True</property>
                 <child>
-                  <object class="GtkExpander" id="logexpander">
+                  <object class="GtkScrolledWindow" id="logscroller">
                     <property name="visible">True</property>
                     <property name="can_focus">True</property>
-                    <property name="expanded">True</property>
-                    <property name="label_fill">True</property>
-                    <property name="resize_toplevel">True</property>
+                    <property name="shadow_type">in</property>
                     <child>
                       <object class="GtkTextView" id="logview">
                         <property name="visible">True</property>
@@ -198,13 +199,13 @@
                         <property name="monospace">True</property>
                       </object>
                     </child>
-                    <child type="label">
-                      <object class="GtkLabel" id="loglabel">
-                        <property name="visible">True</property>
-                        <property name="can_focus">False</property>
-                        <property name="label" translatable="yes">Logs</property>
-                      </object>
-                    </child>
+                  </object>
+                </child>
+                <child type="label">
+                  <object class="GtkLabel" id="loglabel">
+                    <property name="visible">True</property>
+                    <property name="can_focus">False</property>
+                    <property name="label" translatable="yes">Logs</property>
                   </object>
                 </child>
               </object>
@@ -213,7 +214,7 @@
           <packing>
             <property name="expand">True</property>
             <property name="fill">True</property>
-            <property name="position">4</property>
+            <property name="position">3</property>
           </packing>
         </child>
       </object>