FDS reader, faster CRC calculations

9 files changed, 683 insertions, 360 deletions

diff --git a/Makefile b/Makefile
index 444daec..323d533 100644
--- a/Makefile
+++ b/Makefile
@@ -5,7 +5,8 @@ PROGRAMMER_TYPE ?= avr109
 PROGRAMMER_PORT ?= com28
 
 PRG            = famicom-dumper
-OBJ            = dumper.o usart.o comm.o
+OBJ            = dumper.o usart.o comm.o crc.o
+HEADERS        = defines.h comm.h dumper.h usart.h crc.h
 #MCU_TARGET     = at90s2313
 #MCU_TARGET     = at90s2333
 #MCU_TARGET     = at90s4414
@@ -59,8 +60,6 @@ OPTIMIZE       = -O2
 DEFS           =
 LIBS           =
 
-# You should not have to change anything below here.
-
 CC             = avr-gcc
 
 # Override is only needed by avr-lib build system.
@@ -71,13 +70,12 @@ override LDFLAGS       = -Wl,-Map,$(PRG).map
 OBJCOPY        = avr-objcopy
 OBJDUMP        = avr-objdump
 
-all: $(PRG).elf lst text eeprom
+all: $(PRG).elf lst text
 
 $(PRG).elf: $(OBJ)
 	$(CC) $(CFLAGS) $(LDFLAGS) -o $@ $^ $(LIBS)
 
-# dependency:
-demo.o: demo.c
+$(OBJ): $(HEADERS)
 
 clean:
 	rm -rf *.o $(PRG).elf *.eps *.png *.pdf *.bak 
@@ -105,46 +103,7 @@ srec: $(PRG).srec
 %.bin: %.elf
 	$(OBJCOPY) -j .text -j .data -O binary $< $@
 
-# Rules for building the .eeprom rom images
-
-eeprom: ehex ebin esrec
-
-ehex:  $(PRG)_eeprom.hex
-ebin:  $(PRG)_eeprom.bin
-esrec: $(PRG)_eeprom.srec
-
-%_eeprom.hex: %.elf
-	$(OBJCOPY) -j .eeprom --change-section-lma .eeprom=0 -O ihex $< $@ \
-	|| { echo empty $@ not generated; exit 0; }
-
-%_eeprom.srec: %.elf
-	$(OBJCOPY) -j .eeprom --change-section-lma .eeprom=0 -O srec $< $@ \
-	|| { echo empty $@ not generated; exit 0; }
-
-%_eeprom.bin: %.elf
-	$(OBJCOPY) -j .eeprom --change-section-lma .eeprom=0 -O binary $< $@ \
-	|| { echo empty $@ not generated; exit 0; }
-
-# Every thing below here is used by avr-libc's build system and can be ignored
-# by the casual user.
-
-FIG2DEV                 = fig2dev
-EXTRA_CLEAN_FILES       = *.hex *.bin *.srec
-
-dox: eps png pdf
-
-eps: $(PRG).eps
-png: $(PRG).png
-pdf: $(PRG).pdf
-
-%.eps: %.fig
-	$(FIG2DEV) -L eps $< $@
-
-%.pdf: %.fig
-	$(FIG2DEV) -L pdf $< $@
-
-%.png: %.fig
-	$(FIG2DEV) -L png $< $@
+# Rules to update
 
 program: hex
 	avrdude -V -p $(MCU_PROGRAMMER) -c $(PROGRAMMER_TYPE) -P $(PROGRAMMER_PORT) -U flash:w:$(PRG).hex
@@ -155,3 +114,5 @@ reboot:
 update: reboot program
 
 build: hex
+
+.PHONY: program reboot update
diff --git a/comm.c b/comm.c
index 36ca781..1c39c21 100644
--- a/comm.c
+++ b/comm.c
@@ -3,6 +3,7 @@
 #include <util/delay.h>

 #include "comm.h"

 #include "usart.h"

+#include "crc.h"

 

 static uint8_t comm_send_crc;

 static unsigned int comm_send_length;

@@ -17,35 +18,9 @@ volatile unsigned int comm_recv_length;
 volatile uint8_t recv_buffer[RECV_BUFFER+8];

 volatile uint8_t comm_recv_done;

 

-static void comm_calc_send_crc(uint8_t inbyte)

-{

-  uint8_t j;

-  for (j=0;j<8;j++) 

-  {

-		uint8_t mix = (comm_send_crc ^ inbyte) & 0x01;

-		comm_send_crc >>= 1;

-		if (mix) 

-			comm_send_crc ^= 0x8C;                  

-		inbyte >>= 1;

-  }

-}

-

-static void comm_calc_recv_crc(uint8_t inbyte)

-{

-  uint8_t j;

-  for (j=0;j<8;j++) 

-  {

-		uint8_t mix = (comm_recv_crc ^ inbyte) & 0x01;

-		comm_recv_crc >>= 1;

-		if (mix) 

-			comm_recv_crc ^= 0x8C;                  

-		inbyte >>= 1;

-  }

-}

-

 static void comm_send_and_calc(uint8_t data)

 {

-	comm_calc_send_crc(data);

+	comm_send_crc = calc_crc8(comm_send_crc, data);

 	USART_TransmitByte(data);

 #ifdef SEND_DELAY

 	_delay_us(SEND_DELAY);

@@ -84,7 +59,7 @@ void comm_proceed(uint8_t data)
 		comm_recv_crc = 0;

 		comm_recv_done = 0;

 	}

-	comm_calc_recv_crc(data);

+	comm_recv_crc= calc_crc8(comm_recv_crc, data);

 	unsigned int l = comm_recv_pos-4;

 	switch (comm_recv_pos)

 	{

diff --git a/comm.h b/comm.h
index 44a4d6f..a0804db 100644
--- a/comm.h
+++ b/comm.h
@@ -45,6 +45,10 @@
 #define COMMAND_FLASH_WRITE_TIMEOUT 42

 #define COMMAND_FLASH_ERASE_ERROR 43

 #define COMMAND_FLASH_ERASE_TIMEOUT 44

+#define COMMAND_FDS_READ_REQUEST 45

+#define COMMAND_FDS_READ_RESULT_BLOCK 46

+#define COMMAND_FDS_READ_RESULT_END 47

+#define COMMAND_FDS_TIMEOUT 48

 

 #define COMMAND_BOOTLOADER 0xFE

 #define COMMAND_DEBUG 0xFF

diff --git a/crc.c b/crc.c
new file mode 100644
index 0000000..1588e41
--- /dev/null
+++ b/crc.c
@@ -0,0 +1,37 @@
+#include <inttypes.h>

+

+const uint8_t crc8_table[] = { 0, 94, 188, 226, 97, 63, 221, 131, 194, 156, 126, 32, 163, 253, 31, 65, 157, 195, 33, 127, 252, 162, 64, 30, 95, 1,

+    227, 189, 62, 96, 130, 220, 35, 125, 159, 193, 66, 28, 254, 160, 225, 191, 93, 3, 128, 222, 60, 98, 190, 224, 2, 92, 223, 129, 99, 61, 124, 34,

+    192, 158, 29, 67, 161, 255, 70, 24, 250, 164, 39, 121, 155, 197, 132, 218, 56, 102, 229, 187, 89, 7, 219, 133, 103, 57, 186, 228, 6, 88, 25, 71,

+    165, 251, 120, 38, 196, 154, 101, 59, 217, 135, 4, 90, 184, 230, 167, 249, 27, 69, 198, 152, 122, 36, 248, 166, 68, 26, 153, 199, 37, 123, 58,

+    100, 134, 216, 91, 5, 231, 185, 140, 210, 48, 110, 237, 179, 81, 15, 78, 16, 242, 172, 47, 113, 147, 205, 17, 79, 173, 243, 112, 46, 204, 146,

+    211, 141, 111, 49, 178, 236, 14, 80, 175, 241, 19, 77, 206, 144, 114, 44, 109, 51, 209, 143, 12, 82, 176, 238, 50, 108, 142, 208, 83, 13, 239,

+    177, 240, 174, 76, 18, 145, 207, 45, 115, 202, 148, 118, 40, 171, 245, 23, 73, 8, 86, 180, 234, 105, 55, 213, 139, 87, 9, 235, 181, 54, 104, 138,

+    212, 149, 203, 41, 119, 244, 170, 72, 22, 233, 183, 85, 11, 136, 214, 52, 106, 43, 117, 151, 201, 74, 20, 246, 168, 116, 42, 200, 150, 21, 75,

+    169, 247, 182, 232, 10, 84, 215, 137, 107, 53 };

+

+const uint16_t crc16_table[] = { 0x0000, 0xC0C1, 0xC181, 0x0140, 0xC301, 0x03C0, 0x0280, 0xC241, 0xC601, 0x06C0, 0x0780, 0xC741, 0x0500, 0xC5C1,

+    0xC481, 0x0440, 0xCC01, 0x0CC0, 0x0D80, 0xCD41, 0x0F00, 0xCFC1, 0xCE81, 0x0E40, 0x0A00, 0xCAC1, 0xCB81, 0x0B40, 0xC901, 0x09C0, 0x0880, 0xC841,

+    0xD801, 0x18C0, 0x1980, 0xD941, 0x1B00, 0xDBC1, 0xDA81, 0x1A40, 0x1E00, 0xDEC1, 0xDF81, 0x1F40, 0xDD01, 0x1DC0, 0x1C80, 0xDC41, 0x1400, 0xD4C1,

+    0xD581, 0x1540, 0xD701, 0x17C0, 0x1680, 0xD641, 0xD201, 0x12C0, 0x1380, 0xD341, 0x1100, 0xD1C1, 0xD081, 0x1040, 0xF001, 0x30C0, 0x3180, 0xF141,

+    0x3300, 0xF3C1, 0xF281, 0x3240, 0x3600, 0xF6C1, 0xF781, 0x3740, 0xF501, 0x35C0, 0x3480, 0xF441, 0x3C00, 0xFCC1, 0xFD81, 0x3D40, 0xFF01, 0x3FC0,

+    0x3E80, 0xFE41, 0xFA01, 0x3AC0, 0x3B80, 0xFB41, 0x3900, 0xF9C1, 0xF881, 0x3840, 0x2800, 0xE8C1, 0xE981, 0x2940, 0xEB01, 0x2BC0, 0x2A80, 0xEA41,

+    0xEE01, 0x2EC0, 0x2F80, 0xEF41, 0x2D00, 0xEDC1, 0xEC81, 0x2C40, 0xE401, 0x24C0, 0x2580, 0xE541, 0x2700, 0xE7C1, 0xE681, 0x2640, 0x2200, 0xE2C1,

+    0xE381, 0x2340, 0xE101, 0x21C0, 0x2080, 0xE041, 0xA001, 0x60C0, 0x6180, 0xA141, 0x6300, 0xA3C1, 0xA281, 0x6240, 0x6600, 0xA6C1, 0xA781, 0x6740,

+    0xA501, 0x65C0, 0x6480, 0xA441, 0x6C00, 0xACC1, 0xAD81, 0x6D40, 0xAF01, 0x6FC0, 0x6E80, 0xAE41, 0xAA01, 0x6AC0, 0x6B80, 0xAB41, 0x6900, 0xA9C1,

+    0xA881, 0x6840, 0x7800, 0xB8C1, 0xB981, 0x7940, 0xBB01, 0x7BC0, 0x7A80, 0xBA41, 0xBE01, 0x7EC0, 0x7F80, 0xBF41, 0x7D00, 0xBDC1, 0xBC81, 0x7C40,

+    0xB401, 0x74C0, 0x7580, 0xB541, 0x7700, 0xB7C1, 0xB681, 0x7640, 0x7200, 0xB2C1, 0xB381, 0x7340, 0xB101, 0x71C0, 0x7080, 0xB041, 0x5000, 0x90C1,

+    0x9181, 0x5140, 0x9301, 0x53C0, 0x5280, 0x9241, 0x9601, 0x56C0, 0x5780, 0x9741, 0x5500, 0x95C1, 0x9481, 0x5440, 0x9C01, 0x5CC0, 0x5D80, 0x9D41,

+    0x5F00, 0x9FC1, 0x9E81, 0x5E40, 0x5A00, 0x9AC1, 0x9B81, 0x5B40, 0x9901, 0x59C0, 0x5880, 0x9841, 0x8801, 0x48C0, 0x4980, 0x8941, 0x4B00, 0x8BC1,

+    0x8A81, 0x4A40, 0x4E00, 0x8EC1, 0x8F81, 0x4F40, 0x8D01, 0x4DC0, 0x4C80, 0x8C41, 0x4400, 0x84C1, 0x8581, 0x4540, 0x8701, 0x47C0, 0x4680, 0x8641,

+    0x8201, 0x42C0, 0x4380, 0x8341, 0x4100, 0x81C1, 0x8081, 0x4040, };

+

+uint8_t calc_crc8(uint8_t old_crc, uint8_t inbyte)

+{

+  return crc8_table[old_crc ^ inbyte];

+}

+

+uint16_t calc_crc16(uint16_t old_crc, uint8_t inbyte)

+{

+  return (old_crc >> 8) ^ crc16_table[((old_crc ^ inbyte) & 0x00FF) & 0xFF];

+}

diff --git a/crc.h b/crc.h
new file mode 100644
index 0000000..c786e85
--- /dev/null
+++ b/crc.h
@@ -0,0 +1,10 @@
+#ifndef _CRC_H_

+#define _CRC_H_

+

+extern const uint16_t crc8_table[];

+extern const uint16_t crc16_table[];

+

+uint8_t calc_crc8(uint8_t old_crc, uint8_t inbyte);

+uint16_t calc_crc16(uint16_t old_crc, uint8_t inbyte);

+

+#endif

diff --git a/crc.o b/crc.o
new file mode 100644
index 0000000..b76c807
--- /dev/null
+++ b/crc.o
diff --git a/dumper.c b/dumper.c
index 4f61681..9340782 100644
--- a/dumper.c
+++ b/dumper.c
@@ -30,6 +30,7 @@
 #include "usart.h"
 #include "comm.h"
 #include "dumper.h"
+#include "crc.h"
 
 #define LED_RED_ON PORTB |= (1<<7)
 #define LED_RED_OFF PORTB &= ~(1<<7)
@@ -160,20 +161,6 @@ static void read_chr_send(uint16_t address, uint16_t len)
   LED_GREEN_OFF;
 }
 
-static uint16_t crc16_update(uint16_t crc, uint8_t a)
-{
-  int i;
-  crc ^= a;
-  for (i = 0; i < 8; ++i)
-  {
-    if (crc & 1)
-      crc = (crc >> 1) ^ 0xA001;
-    else
-      crc = (crc >> 1);
-  }
-  return crc;
-}
-
 static void read_prg_crc_send(uint16_t address, uint16_t len)
 {
   LED_GREEN_ON;
@@ -187,7 +174,7 @@ static void read_prg_crc_send(uint16_t address, uint16_t len)
     PORTA = address & 0xFF;
     PORTC = (address >> 8) & 0xFF;
     _delay_us(1);
-    crc = crc16_update(crc, PIND);
+    crc = calc_crc16(crc, PIND);
     len--;
     address++;
   }
@@ -205,7 +192,7 @@ static void read_chr_crc_send(uint16_t address, uint16_t len)
   uint16_t crc = 0;
   while (len > 0)
   {
-    crc = crc16_update(crc, read_chr_byte(address));
+    crc = calc_crc16(crc, read_chr_byte(address));
     len--;
     address++;
   }
@@ -614,6 +601,212 @@ static void write_flash(uint16_t address, uint16_t len, uint8_t* data)
   LED_RED_OFF;
 }
 
+static void read_fds_send(uint8_t start_block, uint8_t block_count)
+{
+  uint8_t status;
+  uint8_t end_of_head = 0;
+  uint8_t current_block = 0;
+  uint16_t b;
+
+  write_prg_byte(0x4022, 0x00); // disable IRQ
+  write_prg_byte(0x4023, 0x00); // disable registers
+  write_prg_byte(0x4023, 0x01); // enable disk registers
+  write_prg_byte(0x4025, 0x2E); // reset
+  // waiting for disk
+  while (1)
+  {
+     status = read_prg_byte(0x4032);
+     if (!(status & 1)) break; // disk inserted
+  }
+  write_prg_byte(0x4025, 0x2E); // reset
+  _delay_ms(800); // 916522 cycles
+  write_prg_byte(0x4025, 0x2F); // start motor
+  write_prg_byte(0x4025, 0x2D); // unreset
+
+  _delay_ms(250); // 268531 cycles
+  write_prg_byte(0x4025, 0x2E); // reset
+  write_prg_byte(0x4025, 0x2F); // start motor
+  write_prg_byte(0x4025, 0x2D); // unreset
+
+  // waiting until drive is rewinded
+  while (1)
+  {
+     status = read_prg_byte(0x4032);
+     if (!(status & 2)) break; // ready
+  }
+
+  _delay_ms(FDS_PAUSE_BEFORE_FIRST_BLOCK); // 486974 cycles
+
+  LED_GREEN_ON;
+  if (start_block == 0)
+    comm_start(COMMAND_FDS_READ_RESULT_BLOCK, 58);
+  write_prg_byte(0x4025, 0x6D); // start transfer
+  write_prg_byte(0x4025, 0xED); // enable IRQ
+  for (b = 0; b < 56; b++)
+  {
+    while (!IRQ_FIRED); // waiting for interrupt
+    uint8_t data = read_prg_byte(0x4031);
+    //write_prg_byte(0x4024, 0xFF); // clear interrupt
+    // status read also clears interrupt
+    status = read_prg_byte(0x4030);
+    end_of_head |= (status >> 6) & 1;
+    if (start_block == 0)
+      comm_send_byte(data);
+    while (IRQ_FIRED); // is interrupt flag cleared?
+  }
+  write_prg_byte(0x4025, 0xED); // enable CRC control
+  while (!IRQ_FIRED); // waiting for interrupt
+  read_prg_byte(0x4031);
+  write_prg_byte(0x4024, 0xFF); // clear interrupt
+  while (IRQ_FIRED); // is interrupt flag cleared?
+  status = read_prg_byte(0x4030);
+  end_of_head |= (status >> 6) & 1;
+  if (start_block == 0)
+  {
+    comm_send_byte(((status >> 4) & 1) ^ 1); // CRC check result
+    comm_send_byte(end_of_head); // end of head meet?
+  }
+  current_block++;
+  
+  // reading file amount block
+  if (!end_of_head && ((start_block + block_count > current_block) || (block_count = 0)))
+  {
+    write_prg_byte(0x4025, 0x2D); // motor on without transfer
+    // waiting until drive is ready
+    while (1)
+    {
+      status = read_prg_byte(0x4032);
+      if (!(status & 2)) break; // ready
+    }
+    _delay_ms(FDS_PAUSE_BETWEEN_BLOCKS); // 9026 cycles
+    if ((current_block >= start_block) && ((current_block < start_block + block_count) || (block_count == 0)))
+      comm_start(COMMAND_FDS_READ_RESULT_BLOCK, 4);
+    write_prg_byte(0x4025, 0x6D); // start transfer
+    write_prg_byte(0x4025, 0xED); // enable IRQ
+    for (b = 0; b < 2; b++)
+    {
+      while (!IRQ_FIRED); // waiting for interrupt
+      uint8_t data = read_prg_byte(0x4031);
+      //write_prg_byte(0x4024, 0xFF); // clear interrupt
+      // status read also clears interrupt
+      status = read_prg_byte(0x4030);
+      end_of_head |= (status >> 6) & 1;
+      if ((current_block >= start_block) && ((current_block < start_block + block_count) || (block_count == 0)))
+        comm_send_byte(data);
+      while (IRQ_FIRED); // is interrupt flag cleared?
+    }
+    write_prg_byte(0x4025, 0xED); // enable CRC control
+    while (!IRQ_FIRED); // waiting for interrupt
+    read_prg_byte(0x4031);
+    write_prg_byte(0x4024, 0xFF); // clear interrupt
+    while (IRQ_FIRED); // is interrupt flag cleared?
+    status = read_prg_byte(0x4030);
+    end_of_head |= (status >> 6) & 1;
+    if ((current_block >= start_block) && ((current_block < start_block + block_count) || (block_count == 0)))
+    {
+      comm_send_byte(((status >> 4) & 1) ^ 1); // CRC check result
+      comm_send_byte(end_of_head); // end of head meet?
+    }
+    current_block++;    
+  }
+
+  while (!end_of_head && ((start_block + block_count > current_block) || (block_count = 0)))
+  {
+    // reading file header block
+    uint16_t file_size = 0; // size of the next file
+
+    write_prg_byte(0x4025, 0x2D); // motor on without transfer
+    // waiting until drive is ready
+    while (1)
+    {
+      status = read_prg_byte(0x4032);
+      if (!(status & 2)) break; // ready
+    }
+    _delay_ms(FDS_PAUSE_BETWEEN_BLOCKS); // 9026 cycles
+    if ((current_block >= start_block) && ((current_block < start_block + block_count) || (block_count == 0)))
+      comm_start(COMMAND_FDS_READ_RESULT_BLOCK, 18);
+    write_prg_byte(0x4025, 0x6D); // start transfer
+    write_prg_byte(0x4025, 0xED); // enable IRQ
+    for (b = 0; b < 16; b++)
+    {
+      while (!IRQ_FIRED); // waiting for interrupt
+      uint8_t data = read_prg_byte(0x4031);
+      //write_prg_byte(0x4024, 0xFF); // clear interrupt
+      // status read also clears interrupt
+      status = read_prg_byte(0x4030);
+      end_of_head |= (status >> 6) & 1;
+      if ((current_block >= start_block) && ((current_block < start_block + block_count) || (block_count == 0)))
+        comm_send_byte(data);
+      if (b == 13)
+        file_size |= data;
+      else if (b == 14)
+        file_size |= data << 8;
+      while (IRQ_FIRED); // is interrupt flag cleared?
+    }
+    write_prg_byte(0x4025, 0xED); // enable CRC control
+    while (!IRQ_FIRED); // waiting for interrupt
+    read_prg_byte(0x4031);
+    write_prg_byte(0x4024, 0xFF); // clear interrupt
+    while (IRQ_FIRED); // is interrupt flag cleared?
+    status = read_prg_byte(0x4030);
+    end_of_head |= (status >> 6) & 1;
+    if ((current_block >= start_block) && ((current_block < start_block + block_count) || (block_count == 0)))
+    {
+      comm_send_byte(((status >> 4) & 1) ^ 1); // CRC check result
+      comm_send_byte(end_of_head); // end of head meet?
+    }
+    current_block++;    
+
+    // reading file data
+    if (!end_of_head && ((start_block + block_count > current_block) || (block_count = 0)))
+    {
+      write_prg_byte(0x4025, 0x2D); // motor on without transfer
+      // waiting until drive is ready
+      while (1)
+      {
+        status = read_prg_byte(0x4032);
+        if (!(status & 2)) break; // ready
+      }
+      _delay_ms(FDS_PAUSE_BETWEEN_BLOCKS); // 9026 cycles
+      if ((current_block >= start_block) && ((current_block < start_block + block_count) || (block_count == 0)))
+        comm_start(COMMAND_FDS_READ_RESULT_BLOCK, file_size + 3);
+      write_prg_byte(0x4025, 0x6D); // start transfer
+      write_prg_byte(0x4025, 0xED); // enable IRQ
+      for (b = 0; b < file_size + 1; b++)
+      {
+        while (!IRQ_FIRED); // waiting for interrupt
+        uint8_t data = read_prg_byte(0x4031);
+        //write_prg_byte(0x4024, 0xFF); // clear interrupt
+        // status read also clears interrupt
+        status = read_prg_byte(0x4030);
+        end_of_head |= (status >> 6) & 1;
+        if ((current_block >= start_block) && ((current_block < start_block + block_count) || (block_count == 0)))
+          comm_send_byte(data);
+        while (IRQ_FIRED); // is interrupt flag cleared?
+      }
+      write_prg_byte(0x4025, 0xED); // enable CRC control
+      while (!IRQ_FIRED); // waiting for interrupt
+      read_prg_byte(0x4031);
+      write_prg_byte(0x4024, 0xFF); // clear interrupt
+      while (IRQ_FIRED); // is interrupt flag cleared?
+      status = read_prg_byte(0x4030);
+      end_of_head |= (status >> 6) & 1;
+      if ((current_block >= start_block) && ((current_block < start_block + block_count) || (block_count == 0)))
+      {
+        comm_send_byte(((status >> 4) & 1) ^ 1); // CRC check result
+        comm_send_byte(end_of_head); // end of head meet?
+      }
+      current_block++;
+    }
+  }
+
+  write_prg_byte(0x4025, 0x26); // reset, stop
+
+  _delay_ms(50);
+  comm_start(COMMAND_FDS_READ_RESULT_END, 0);
+  LED_GREEN_OFF;
+}
+
 void get_mirroring()
 {
   comm_start(COMMAND_MIRRORING_RESULT, 4);
@@ -672,8 +865,8 @@ int main (void)
   comm_init();
   comm_start(COMMAND_PRG_STARTED, 0);
 
-  uint16_t address;
-  uint16_t length;
+  uint32_t address;
+  uint32_t length;
   
   unsigned long int t = 0;
   char led_down = 0;
@@ -799,6 +992,10 @@ int main (void)
           comm_start(COMMAND_CHR_WRITE_DONE, 0);
           break;
 
+        case COMMAND_FDS_READ_REQUEST:
+          read_fds_send(recv_buffer[0], recv_buffer[1]);
+          break;
+
         case COMMAND_MIRRORING_REQUEST:
           get_mirroring();
           break;
diff --git a/dumper.h b/dumper.h
index 9f23863..994eb87 100644
--- a/dumper.h
+++ b/dumper.h
@@ -9,4 +9,9 @@
 #define COOLBOY_DDR COOLBOY_DDRPORT(COOLBOY_GPIO_PORT)

 #define COOLBOY_PIN COOLBOY_INPORT(COOLBOY_GPIO_PORT)

 

+#define IRQ_FIRED (!(PINF & (1<<6)))

+

+#define FDS_PAUSE_BEFORE_FIRST_BLOCK 300

+#define FDS_PAUSE_BETWEEN_BLOCKS 5

+

 #endif

diff --git a/famicom-dumper.hex b/famicom-dumper.hex
index 5704a05..c0014df 100644
--- a/famicom-dumper.hex
+++ b/famicom-dumper.hex
@@ -1,269 +1,403 @@
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