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flat assembler > OS Construction > Problems with floppy controler in PMode

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yupi



Joined: 16 Aug 2017
Posts: 2
Problems with floppy controler in PMode
Hello,
I am writing a driver to a floppy controller. Unfortunately after the calibration there is no interruption. What could be the reason for this? When I enable the controller everything is ok-an interrupt occurs.
Codes:

Code:
fdc_install:
   pushad
   call fdc_initialize_dma
   call fdc_reset ;<==========
;There's nothing going on anymore.
   call fdc_drive_data
   popad
ret


fdc_reset:
    pushad
    call fdc_disable_controler
    call fdc_enable_controler
    call fdc_wait_irq

    mov ecx,4
     .fdc_reset1:

     call fdc_read_data
     dec ecx
     cmp ecx,0
     jne .fdc_reset1

    mov al,0
    call fdc_write_ccr
    call fdc_drive_data

    call fdc_calibrate ;<============
;There's nothing going on anymore.

    popad
ret 

fdc_calibrate:
   pushad
   call fdc_motor_on
   .cal1:
    mov bl,7
    call fdc_send_command
    mov bl,0              ;nr napÄ™du (num of drive)
    call fdc_send_command
    call fdc_wait_irq ;<==========
;There's nothing going on anymore.


    call fdc_check_int
    mov al, [fdc_ret_cyl]
    cmp al0
    jne .cal1
   call fdc_motor_off
   popad
ret 

;=============================
;others:
;=============================
fdc_enable_controler:
     pushad
     mov al4 or 8
     call fdc_write_dor
     popad
ret 

fdc_write_dor:
     pushad
     mov dx,0x3f2
     out dx,al
     popad
ret

fdc_wait_irq:
     pushad
     .wait2:
     mov al,[isirq]
     cmp al,1
     je .fdc_wait1
     hlt
     jmp .wait2
     .fdc_wait1:
     mov [isirq],0
     popad
ret

fdc_send_command:
   pushad
   mov cx,500
   .loop1:
   call fdc_ready_status
   and al,128
   dec cx
   cmp cx,0
   je .fdc_end1
   cmp al,1
   jne .loop1
   ;jest ok
   mov al,bl
   mov dx,0x3f5
   out dx,al
   .fdc_end1:

   popad
ret 

fdc_ready_status:
   push dx
   mov dx0x3f4
   in al,dx
   pop dx
ret 
 






Thanks for the answers. Best regards. Smile

-----EDIT 1
After 3 days I found one bug:


Code:
fdc_send_command:
   pushad
   mov cx,500
   .loop1:
   call fdc_ready_status
   and al,128
   dec cx
   cmp cx,0
   je .fdc_end1
   cmp al,0   ;<==
   je .loop1   ;<====
   ;jest ok
   mov al,bl
   mov dx,0x3f5
   out dx,al
   .fdc_end1:

   popad
ret



Bochs says that, port 0x3f4 return 0x0. 500 times....
Post 16 Aug 2017, 10:12
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yupi



Joined: 16 Aug 2017
Posts: 2
Everything is ok
The error was in another place. I've mistaken function names Very Happy Instead fdc_check_int, I wrote fdc_read_data.
But in Bochs does not work. After reading the sector interrupt does not execute. In VirtualBox everything works fine.
What is wrong?
Output Bochs' console:

Code:
00286732197d[FDD  ] write access to port 0x03f5value=0xe6
00286732197d[FDD  ] command = 0xe6
00286732197d[FDD  ] io_writediskette controller data
00286732214d[FDD  ] read(): during command 0x00port 0x03f4 returns 0xb0
00286732219d[FDD  ] write access to port 0x03f5value=0x04
00286732219d[FDD  ] command = 0x04
00286732219d[FDD  ] io_writediskette controller data
00286732235d[FDD  ] read(): during command 0x00port 0x03f4 returns 0xb0
00286732240d[FDD  ] write access to port 0x03f5value=0x00
00286732240d[FDD  ] command = 0x00
00286732240d[FDD  ] io_writediskette controller data
00286732256d[FDD  ] read(): during command 0x00port 0x03f4 returns 0xb0
00286732261d[FDD  ] write access to port 0x03f5value=0x01
00286732261d[FDD  ] command = 0x01
00286732261d[FDD  ] io_writediskette controller data
00286732277d[FDD  ] read(): during command 0x00port 0x03f4 returns 0xb0
00286732282d[FDD  ] write access to port 0x03f5value=0x02
00286732282d[FDD  ] command = 0x02
00286732282d[FDD  ] io_writediskette controller data
00286732298d[FDD  ] read(): during command 0x00port 0x03f4 returns 0xb0
00286732303d[FDD  ] write access to port 0x03f5value=0x02
00286732303d[FDD  ] command = 0x02
00286732303d[FDD  ] io_writediskette controller data
00286732324d[FDD  ] read(): during command 0x00port 0x03f4 returns 0xb0
00286732329d[FDD  ] write access to port 0x03f5value=0x03
00286732329d[FDD  ] command = 0x03
00286732329d[FDD  ] io_writediskette controller data
00286732345d[FDD  ] read(): during command 0x00port 0x03f4 returns 0xb0
00286732350d[FDD  ] write access to port 0x03f5value=0x01
00286732350d[FDD  ] command = 0x01
00286732350d[FDD  ] io_writediskette controller data
00286732366d[FDD  ] read(): during command 0x00port 0x03f4 returns 0xb0
00286732371d[FDD  ] write access to port 0x03f5value=0xff
00286732371d[FDD  ] command = 0xff
00286732371d[FDD  ] COMMAND: [e6] [04] [00] [01] [02] [02] [03] [01] [ff]
00286732371d[FDD  ] read/write normal data
00286732371d[FDD  ] BEFORE
00286732371d[FDD  ]   drive    = 0
00286732371d[FDD  ]   head     = 1
00286732371d[FDD  ]   cylinder = 0
00286732371d[FDD  ]   sector   = 2
00286732371d[FDD  ]   eot      = 3
00286732371d[FDD  ] floppy_xferdrive=0offset=9728bytes=512direction=from floppy
00286732371d[FDD  ] io_writediskette controller data

Post 17 Aug 2017, 18:26
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