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armando |
KCPSM Assembler log file for program 'fat16rd.psm'.
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Generated by KCPSM version 1.10
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Ken Chapman (Xilinx Ltd) 2002.
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Addr Code
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00 ; FAT16 READER V.050303 - Armando Astarloa - 16 BIT VER.
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00 ; APERT - UPV/EHU 2003 - DISTRIBUTED UNDER GPL LICENCE
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00 ;
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00 ; s0 -> TMP0 s1 -> TMP1 s2 -> TMP2 s3 -> TMP3 s4 -> TMP4 / SECTORS_PER_CLUSTER_READED s5 -> TMP5/SECTOR_WORDS_READED (256 TO 0)
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00 ; s6 -> TMP s7 -> SECTORS_PER_CLUSTER s8 -> CLUSTER_BEGIN_LBA0 (FAT) s9 -> CLUSTER_BEGIN_LBA1 sA -> CLUSTER_BEGIN_LBA2
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00 ; sB -> CLUSTER_BEGIN_LBA3 sC -> ROOT_DIRECTORY_FIRST_CLUSTER0 (SUPPOSED LESS THAN 256 - USUALLY 2)
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00 ; sD -> data[7:0] WB MASTER sE -> data[15:8] WB MASTER sF -> acummulator
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00 CONSTANT DATA_WB_OUT_7_0_MASTER, 00
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00 CONSTANT DATA_WB_OUT_15_8_MASTER, 01
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00 CONSTANT CONTROL_WB_OUT_MASTER, 02
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00 ; D7 = D6 = D5 = D4 = D3 = D2 = A0_MASTER D1 = W_WE_MASTER D0 = STB_O_MASTER
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00 ; STROBE_O_MASTER = 1 & W_WE=0 & WB_A0 = 0
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00 CONSTANT READ_SLAVE, 01
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00 ; STROBE_O_MASTER = 1 & W_WE=1 & WB_A0 = 0
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00 CONSTANT WRITE_LBA_15_0, 03
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00 ; STROBE_CF_READER = 1 & W_WE=1 & WB_A0 = 1
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00 CONSTANT WRITE_LBA_27_16, 07
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00 ;--
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00 ;-- SLAVE INTERFACE
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00 ;--
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00 CONSTANT DATA_WB_OUT_7_0_SLAVE, 03
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00 CONSTANT DATA_WB_OUT_15_8_SLAVE, 04
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00 CONSTANT CONTROL_WB_OUT_SLAVE, 05
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00 ; D7 = D6 = D5 D4 = D3 =
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00 ; D2 = TAG1_ERROR
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00 ; D1 = TAG0_WORD_AVAILABLE
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00 ; D0 = ACK_O_SLAVE
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00 CONSTANT ACK_O_SLAVE, 01
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00 CONSTANT TAG0_WORD_AVAILABLE, 02
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00 CONSTANT ERROR, 04
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00 ;--
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00 ;-- BUS CONTROL SIGNALS
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00 ;--
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00 CONSTANT CONTROL_OUT_MASTER, 06
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00 ; D7 = D6 = D5 = D4 = D3 = D2 = D1 =
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00 ; D0 = WB_BUS_MASTER_WRITE_ENABLE
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00 CONSTANT WB_BUS_MASTER_WRITE_ENABLE, 01
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00 CONSTANT CONTROL_OUT_SLAVE, 07
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00 ; D7 = D6 = D5 = D4 = D3 = D2 = D1 =
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00 ; D0 = WB_BUS_SLAVE_WRITE_ENABLE
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00 CONSTANT WB_BUS_SLAVE_WRITE_ENABLE, 01
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00 ;--
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00 ;-- EXTERNAL REGISTERS FOR MORE DATA ALLOCATION (OTHER OPTION IS THE USE OF
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00 ;-- ANOTHER BLOCK RAM IF IT IS AVALIABLE
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00 ;--
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00 CONSTANT TMP_OUT_0, 08
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00 CONSTANT TMP_OUT_1, 09
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00 CONSTANT TMP_OUT_2, 0A
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00 CONSTANT TMP_OUT_3, 0B
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00 CONSTANT TMP_OUT_4, 0C
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00 CONSTANT TMP_OUT_5, 0D
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00 CONSTANT TMP_OUT_6, 0E
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00 CONSTANT TMP_OUT_7, 0F
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00 ;--
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00 ;-- INPUT PORTS
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00 ;--
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00 ;--
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00 ;-- WISHBONE INTERFACE PORTS - INPUTS
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00 ;--
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00 CONSTANT CONTROL_WB_IN_MASTER, 00
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00 ; D7 = D6 = D5 = D4 = D3 = D2 =
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00 ; D1 = ERROR_INPUT
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00 ; D0 = ACK_I_MASTER
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00 ;
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00 CONSTANT ACK_I_MASTER, 01
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00 CONSTANT ERROR_INPUT, 02
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00 CONSTANT CONTROL_WB_IN_SLAVE, 01
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00 ; D7 = D6 = D5 = D4 = D3 = D2 =
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00 ; D1 = -
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00 ; D0 = STB_I_SLAVE
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00 ;
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00 CONSTANT STB_I_SLAVE, 01
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00 ;CONSTANT TAG0_FORCE_RESET,02
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00 ;--
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00 ;-- WISHBONE INTERFACE PORTS - INPUTS
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00 ;--
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00 CONSTANT DATA_WB_IN_7_0_MASTER, 02
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00 CONSTANT DATA_WB_IN_15_8_MASTER, 03
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00 ;--
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00 ;-- EXTERNAL REGISTERS FOR MORE DATA ALLOCATION (OTHER OPTION IS THE USE OF
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00 ;-- ANOTHER BLOCK RAM IF IT IS AVALIABLE
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00 ;--
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00 CONSTANT TMP_IN_0, 04
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00 CONSTANT TMP_IN_1, 05
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00 CONSTANT TMP_IN_2, 06
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00 CONSTANT TMP_IN_3, 07
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00 CONSTANT TMP_IN_4, 08
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00 CONSTANT TMP_IN_5, 09
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00 CONSTANT TMP_IN_6, 0A
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00 CONSTANT TMP_IN_7, 0B
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00 ;--
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00 ;-- REGISTERS INITIALIZATION
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00 ;--
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00 inicialization:
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00 ;
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00 ; WISHBONE INTERFACES INIZIALIZATION
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00 ;
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00 0F00 LOAD sF, 00
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01 EF00 OUTPUT sF, DATA_WB_OUT_7_0_MASTER[00]
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02 EF01 OUTPUT sF, DATA_WB_OUT_15_8_MASTER[01]
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03 EF03 OUTPUT sF, DATA_WB_OUT_7_0_SLAVE[03]
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04 EF04 OUTPUT sF, DATA_WB_OUT_15_8_SLAVE[04]
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05 EF02 OUTPUT sF, CONTROL_WB_OUT_MASTER[02]
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06 EF05 OUTPUT sF, CONTROL_WB_OUT_SLAVE[05]
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07 ;
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07 ; WAIT FOR 410NS*3 (RESET DELAY)
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07
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07 main:
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07 ; PROCESS MASTER BOOT RECORD
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07 8348 CALL process_master_boot_record[48]
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08 ; PROCESS ROOT DIRECTORY
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08 838B CALL process_root_directory[8B]
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09 start:
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09 83AE CALL cluster_2_lba[AE]
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0A ;CALL write_lba_to_slave
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0A ; sector_per_cluster -> sector_per_cluster_readed
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0A C470 LOAD s4, s7
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0B ; 256 -> (s6) SECTOR_WORDS_READED
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0B 8345 CALL read_sector[45]
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0C idle:
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0C A601 INPUT s6, CONTROL_WB_IN_SLAVE[01]
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0D ; CHECK STB INPUT
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0D ; CONTROL_WB_IN_SLAVE-> TMP (s6)
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0D ; IF STB=1 GO TO THE NEXT STATE
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0D ; IF STB=0 GO TO THE IDLE STATE
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0D 1601 AND s6, STB_I_SLAVE[01]
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0E 910C JUMP Z, idle[0C]
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0F transfer_word_to_master:
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0F 83E8 CALL read_word_from_slave[E8]
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10 83C4 CALL write_a_word_to_master[C4]
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11 ; (SECTOR WORDS READED)-1
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11 6501 SUB s5, 01
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12 check_sectors_words_readed:
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12 ; IF sector_words_readed = 0 THEN READ_NEW_SECTOR
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12 ; IF sector_words_readed > 0 THEN TRANSFER_WORD_TO_MASTER
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12 C551 AND s5, s5
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13 933E CALL Z, check_sector_per_cluster_readed[3E]
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14 810C JUMP idle[0C]
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15 track_new_cluster:
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15 ; save the number of dummy reads that must be done when the fat sector will be readed
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15 ; an are stored into s5 register
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15 ; in s0 bits 6-0 of the cluster number (offset in the sector -> 256 words-fat16 entries)
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15 ; as is each read operation a word is readed no multiplication is needed
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15 ; RESTORE CLUSTER NUMBER
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15 A008 INPUT s0, TMP_IN_4[08]
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16 A109 INPUT s1, TMP_IN_5[09]
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17 A20A INPUT s2, TMP_IN_6[0A]
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18 A30B INPUT s3, TMP_IN_7[0B]
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19 ;
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19 ; compose LBA address of the sector of the fat that must be readed
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19 ;
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19 ; SHIFT RIGHT 15-8 TO 7-0
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19 ;
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19 0F07 LOAD sF, 07
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1A do_shift:
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1A D30E SR0 s3
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1B ; uses the carry for the MSB and stores LSB into the carry
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1B D208 SRA s2
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1C D108 SRA s1
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1D D008 SRA s0
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1E 6F01 SUB sF, 01
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1F 951A JUMP NZ, do_shift[1A]
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20 8335 CALL add_load_fat_begin_lba[35]
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21 ; adds fat_begin_lba to the sector relative to the fat obteined from the cluster
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21 ; now there is the lba of the FAT sector that must be readed in s0,s1,s2,s3
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21 83D3 CALL write_lba_to_slave[D3]
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22 ; -- DUMMY READ OF THE WORDS OF THE SECTOR TILL THE ONE OF THE CLUSTER INTEGER
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22 AF08 INPUT sF, TMP_IN_4[08]
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23 1F7F AND sF, 7F
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24 83E3 CALL do_dummy_reads_from_slave[E3]
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25 ;
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25 ; (sD) data[7:0] WB MASTER -> (s0) TEMPORAL REGISTER
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25 ; (sE) data[7:0] WB MASTER -> (s1) TEMPORAL REGISTER
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25 ; READ 2 BYTES
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25 83E8 CALL read_word_from_slave[E8]
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26 C0D0 LOAD s0, sD
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27 C1E0 LOAD s1, sE
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28 ; (sD) data[7:0] WB MASTER -> (s2) TEMPORAL REGISTER
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28 ; (sE) data[7:0] WB MASTER -> (s3) TEMPORAL REGISTER
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28 ; READ 2 BYTES
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28 ;
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28 ; CHECK IF ITS THE LAST ONE
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28 ; CB3-CL2-CB1-CB0 IN FAT LITTLE ENDIAN ORDER CB0-CB1 CB2-CB3
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28 CFE0 LOAD sF, sE
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29 6FFF SUB sF, FF
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2A 952F JUMP NZ, continue_file_processing[2F]
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2B CFD0 LOAD sF, sD
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2C 6FFF SUB sF, FF
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2D 952F JUMP NZ, continue_file_processing[2F]
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2E file_end:
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2E ; infinite loop (file readed and tranferred)
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2E 812E JUMP file_end[2E]
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2F continue_file_processing:
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2F ; in s0,s1 is the cluster name
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2F ; --
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2F ; (SECTOR WORDS READED)= 256
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2F ; sector_per_cluster -> sector_per_cluster_readed
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2F 0200 LOAD s2, 00
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30 0300 LOAD s3, 00
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31 C470 LOAD s4, s7
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32 83AE CALL cluster_2_lba[AE]
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33 8345 CALL read_sector[45]
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34 8080 RETURN
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35 add_load_fat_begin_lba:
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35 AF04 INPUT sF, TMP_IN_0[04]
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36 C0F4 ADD s0, sF
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37 AF05 INPUT sF, TMP_IN_1[05]
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38 C1F5 ADDCY s1, sF
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39 AF06 INPUT sF, TMP_IN_2[06]
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3A C2F5 ADDCY s2, sF
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3B AF07 INPUT sF, TMP_IN_3[07]
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3C C3F5 ADDCY s3, sF
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3D 8080 RETURN
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3E check_sector_per_cluster_readed:
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3E ; IF sector_per_cluster_readed = 0 THEN TRACK_NEW_CLUSTER
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3E ; IF sector_per_cluster_readed > 0 THEN CHECK SECTOR WORDS READED
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3E ; (sector_per_cluster_readed)-1
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3E ; (SECTOR WORDS READED)= 256
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3E 6401 SUB s4, 01
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3F C441 AND s4, s4
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40 9115 JUMP Z, track_new_cluster[15]
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41 read_new_sector:
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41 ; (SECTOR WORDS READED)= 256
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41 ; increment LBA
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41 ; sector_per_cluster -> sector_per_cluster_readed-1
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41 4001 ADD s0, 01
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42 5100 ADDCY s1, 00
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43 5200 ADDCY s2, 00
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44 5300 ADDCY s3, 00
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45 read_sector:
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45 0500 LOAD s5, 00
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46 83D3 CALL write_lba_to_slave[D3]
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47 8080 RETURN
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48 ;
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48 ; --
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| 242 |
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48 ; -- PROCESS MASTER BOOT RECORD (READ LBA BEGIN OF THE FIRST PARTITION)
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| 243 |
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48 ; --
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| 244 |
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48 process_master_boot_record:
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| 245 |
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48 ;
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| 246 |
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48 ; LOAD LBA FOR MBR READ
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| 247 |
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48 ;
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48 0000 LOAD s0, 00
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| 249 |
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49 0100 LOAD s1, 00
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4A 0200 LOAD s2, 00
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| 251 |
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4B 0300 LOAD s3, 00
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| 252 |
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4C 83D3 CALL write_lba_to_slave[D3]
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| 253 |
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4D ; information of the lba begin for the first partition
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| 254 |
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4D ; has an offset of 454 bytes -> 227(0xE3) words
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| 255 |
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4D 0FE3 LOAD sF, E3
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| 256 |
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4E 83E3 CALL do_dummy_reads_from_slave[E3]
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| 257 |
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4F ;
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| 258 |
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4F ; --
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| 259 |
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4F ; -- MBR READ - Partition_LBA_Begin EXTRACTION
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| 260 |
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4F ; --
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| 261 |
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4F ;
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| 262 |
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4F ; (sD) data[7:0] WB MASTER -> (s0) lba
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4F ; (sE) data[15:8] WB MASTER -> (s1) lba
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| 264 |
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4F ; (sD) data[7:0] WB MASTER -> (s2) lba
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| 265 |
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4F ; (sE) data[15:8] WB MASTER -> (s3) lba
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| 266 |
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4F 8384 CALL store_all_temporal_registers[84]
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| 267 |
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50 C800 LOAD s8, s0
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| 268 |
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51 C910 LOAD s9, s1
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| 269 |
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52 CA20 LOAD sA, s2
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| 270 |
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53 CB30 LOAD sB, s3
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54 ;
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54 ; NOW IS THE LBA_BEGIN ON THE TMP REGISTERS
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54 ; --------------------
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| 274 |
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54 ; READ FIRST SECTOR (FAT32 VOLUMEN ID) OF THE PARTITION
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| 275 |
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54 ; ---------------------
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54 83D3 CALL write_lba_to_slave[D3]
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| 277 |
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55 ;
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| 278 |
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55 ; READ -> SECTORS_PER_CLUSTER (OFFSET 0x0D)
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| 279 |
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55 ;
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55 ; offset 0x0D (13) => READ 13 bytes -> 6(0x06) words and drop LSB in the next
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| 281 |
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55 0F06 LOAD sF, 06
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| 282 |
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56 83E3 CALL do_dummy_reads_from_slave[E3]
|
| 283 |
|
|
57 ;
|
| 284 |
|
|
57 ; (sE) data[7:0] WB MASTER -> (s7) SECTORS PER CLUSTER
|
| 285 |
|
|
57 83E8 CALL read_word_from_slave[E8]
|
| 286 |
|
|
58 C7E0 LOAD s7, sE
|
| 287 |
|
|
59 ;
|
| 288 |
|
|
59 ; READ -> Number_of_Reserved_Sectors (2 bytes) (OFFSET 0x0E)
|
| 289 |
|
|
59 ;
|
| 290 |
|
|
59 ; offset 0x0E (14) => READ 2 bytes -> 1(0x01) words
|
| 291 |
|
|
59 ; (sD) data[15:8] WB MASTER -> (s6) TEMPORAL REGISTER
|
| 292 |
|
|
59 83E8 CALL read_word_from_slave[E8]
|
| 293 |
|
|
5A C6D0 LOAD s6, sD
|
| 294 |
|
|
5B ; (sE) data[7:0] WB MASTER -> (s4) TEMPORAL REGISTER
|
| 295 |
|
|
5B ;
|
| 296 |
|
|
5B C4E0 LOAD s4, sE
|
| 297 |
|
|
5C ;
|
| 298 |
|
|
5C ;fat_begin_lba = Partition_LBA_Begin + Number_of_Reserved_Sectors
|
| 299 |
|
|
5C ;
|
| 300 |
|
|
5C C864 ADD s8, s6
|
| 301 |
|
|
5D C945 ADDCY s9, s4
|
| 302 |
|
|
5E 5A00 ADDCY sA, 00
|
| 303 |
|
|
5F 5B00 ADDCY sB, 00
|
| 304 |
|
|
60 ; store fat_begin_lba in external registers
|
| 305 |
|
|
60 E808 OUTPUT s8, TMP_OUT_0[08]
|
| 306 |
|
|
61 E909 OUTPUT s9, TMP_OUT_1[09]
|
| 307 |
|
|
62 EA0A OUTPUT sA, TMP_OUT_2[0A]
|
| 308 |
|
|
63 EB0B OUTPUT sB, TMP_OUT_3[0B]
|
| 309 |
|
|
64 ;
|
| 310 |
|
|
64 ;cluster_begin_lba = Partition_LBA_Begin + Number_of_Reserved_Sectors +
|
| 311 |
|
|
64 ; (Number_of_FATs * Sectors_Per_FAT)+ RootDirSectors;
|
| 312 |
|
|
64 ;cluster_begin_lba = fat_begin_lba + (Number_of_FATs * Sectors_Per_FAT)+ RootDirSectors;
|
| 313 |
|
|
64 ; READ -> Number_of_Fats (OFFSET 0x10) (always 2)
|
| 314 |
|
|
64 ;
|
| 315 |
|
|
64 ; offset 0x10 (16) => READ 2 bytes -> 1(0x01) words
|
| 316 |
|
|
64 ;
|
| 317 |
|
|
64 ; (sD) data[7:0] WB MASTER -> (s6) TEMPORAL REGISTER
|
| 318 |
|
|
64 83E8 CALL read_word_from_slave[E8]
|
| 319 |
|
|
65 C6D0 LOAD s6, sD
|
| 320 |
|
|
66 ;
|
| 321 |
|
|
66 ; FOR FAT16 => NUMBER OF SECTORS OCCUPIED BY THE ROOT DIRECTORY (BYTES_PER_SEC=512)
|
| 322 |
|
|
66 ;
|
| 323 |
|
|
66 ; READ -> RootEntCnt (OFFSET 0x11) (FAT16 PROCESSING)
|
| 324 |
|
|
66 ; RootDirSectors=((BPB_RootEntCnt*32)+(BPB_BytesPerSec-1))/BPB_BytesPerSec
|
| 325 |
|
|
66 ; offset 0x11 (17) => READ 1 bytes
|
| 326 |
|
|
66 ;
|
| 327 |
|
|
66 ; (sE) data[7:0] WB MASTER -> (s0) TEMPORAL REGISTER
|
| 328 |
|
|
66 C0E0 LOAD s0, sE
|
| 329 |
|
|
67 ; (sD) data[15:0] WB MASTER -> (sD) TEMPORAL REGISTER - offset 0x12 (18) => READ 1 bytes
|
| 330 |
|
|
67 83E8 CALL read_word_from_slave[E8]
|
| 331 |
|
|
68 C1D0 LOAD s1, sD
|
| 332 |
|
|
69 ; MULTIPLY BY 32 (100000) 5 SHIFTS TO THE LEFT
|
| 333 |
|
|
69 0F05 LOAD sF, 05
|
| 334 |
|
|
6A ; LSB '0'
|
| 335 |
|
|
6A mult_32:
|
| 336 |
|
|
6A D006 SL0 s0
|
| 337 |
|
|
6B ; CARRY -> LSB , MSB -> CARRY
|
| 338 |
|
|
6B D100 SLA s1
|
| 339 |
|
|
6C 6F01 SUB sF, 01
|
| 340 |
|
|
6D 956A JUMP NZ, mult_32[6A]
|
| 341 |
|
|
6E ;BPB_RootEntCnt*32+(BPB_BytesPerSec-1) 511 (0x1FF)
|
| 342 |
|
|
6E ;ADD s0,FF (if rounds up => not necessary??)
|
| 343 |
|
|
6E ;ADDCY s1,01
|
| 344 |
|
|
6E ;/BPB_BytesPerSec (512) (1000000000)9 SHIFTS TO THE RIGHT
|
| 345 |
|
|
6E 0F09 LOAD sF, 09
|
| 346 |
|
|
6F div_512:
|
| 347 |
|
|
6F ; uses the carry for the MSB and stores LSB into the carry
|
| 348 |
|
|
6F D10E SR0 s1
|
| 349 |
|
|
70 D008 SRA s0
|
| 350 |
|
|
71 6F01 SUB sF, 01
|
| 351 |
|
|
72 956F JUMP NZ, div_512[6F]
|
| 352 |
|
|
73 ; ROUNDs UP
|
| 353 |
|
|
73 ;ADD s0,01
|
| 354 |
|
|
73 ;ADDCY s1,00
|
| 355 |
|
|
73 ;fat_begin_lba + RootDirSectors
|
| 356 |
|
|
73 C804 ADD s8, s0
|
| 357 |
|
|
74 C915 ADDCY s9, s1
|
| 358 |
|
|
75 CA25 ADDCY sA, s2
|
| 359 |
|
|
76 CB35 ADDCY sB, s3
|
| 360 |
|
|
77 ; READ -> Sectors_per_fat (OFFSET 0x24)
|
| 361 |
|
|
77 ;
|
| 362 |
|
|
77 ; offset 0x16 (22) => READ 2 bytes -> 01(0x01) words
|
| 363 |
|
|
77 ;
|
| 364 |
|
|
77 0F01 LOAD sF, 01
|
| 365 |
|
|
78 83E3 CALL do_dummy_reads_from_slave[E3]
|
| 366 |
|
|
79 8384 CALL store_all_temporal_registers[84]
|
| 367 |
|
|
7A ; (Number_of_FATs * Sectors_Per_FAT)
|
| 368 |
|
|
7A ; Number_of_FATs = 2 (10) . Do a shift to the left of the Sectors_Per_Fat
|
| 369 |
|
|
7A ; *** FAT16 = Sectors_per_fat(BPB_FATSz16)
|
| 370 |
|
|
7A ; LSB '0'
|
| 371 |
|
|
7A D006 SL0 s0
|
| 372 |
|
|
7B ; CARRY -> LSB , MSB -> CARRY
|
| 373 |
|
|
7B D100 SLA s1
|
| 374 |
|
|
7C ;SLA s2 for fat16 only 2 bytes
|
| 375 |
|
|
7C ;SLA s3
|
| 376 |
|
|
7C ; fat_begin_lba + RootDirSectors + (Number_of_FATs * Sectors_Per_FAT)
|
| 377 |
|
|
7C C804 ADD s8, s0
|
| 378 |
|
|
7D C915 ADDCY s9, s1
|
| 379 |
|
|
7E 5A00 ADDCY sA, 00
|
| 380 |
|
|
7F 5B00 ADDCY sB, 00
|
| 381 |
|
|
80 ; cluster_begin_lba is stored in s8, s9, sA, SB
|
| 382 |
|
|
80 ;
|
| 383 |
|
|
80 ; FOR FAT16 ROOT DIRECTORY POSITION IS FIXED
|
| 384 |
|
|
80 ; root_first_lba = fat_begin_lba(in external regs) + (Number_of_FATs * Sectors_Per_FAT) (s0,s1,s2,s3)
|
| 385 |
|
|
80 ;
|
| 386 |
|
|
80 0200 LOAD s2, 00
|
| 387 |
|
|
81 0300 LOAD s3, 00
|
| 388 |
|
|
82 8335 CALL add_load_fat_begin_lba[35]
|
| 389 |
|
|
83 ; s0,s1,s2,s3 have Root directory begin lba
|
| 390 |
|
|
83 8080 RETURN
|
| 391 |
|
|
84 store_all_temporal_registers:
|
| 392 |
|
|
84 ; READ 2 BYTES
|
| 393 |
|
|
84 83E8 CALL read_word_from_slave[E8]
|
| 394 |
|
|
85 ; (sD) data[7:0] WB MASTER -> (s0) TEMPORAL REGISTER
|
| 395 |
|
|
85 ; (sE) data[7:0] WB MASTER -> (s1) TEMPORAL REGISTER
|
| 396 |
|
|
85 C0D0 LOAD s0, sD
|
| 397 |
|
|
86 C1E0 LOAD s1, sE
|
| 398 |
|
|
87 ; (sD) data[7:0] WB MASTER -> (s2) TEMPORAL REGISTER
|
| 399 |
|
|
87 ; (sE) data[7:0] WB MASTER -> (s3) TEMPORAL REGISTER
|
| 400 |
|
|
87 ; READ 2 BYTES
|
| 401 |
|
|
87 83E8 CALL read_word_from_slave[E8]
|
| 402 |
|
|
88 C2D0 LOAD s2, sD
|
| 403 |
|
|
89 C3E0 LOAD s3, sE
|
| 404 |
|
|
8A 8080 RETURN
|
| 405 |
|
|
8B process_root_directory:
|
| 406 |
|
|
8B ; INPUT :
|
| 407 |
|
|
8B ; s0,s1,s2,s3 root directory lba (FAT16- FIXED)
|
| 408 |
|
|
8B ; CALL cluster_2_lba
|
| 409 |
|
|
8B ; now s0,s1,s2,s3 contains the lba for the root directory
|
| 410 |
|
|
8B ; the first 32 byte record on the sector must be the root directory information
|
| 411 |
|
|
8B ; check if EOF (first byte of the 32 bytes is 0)
|
| 412 |
|
|
8B 83D3 CALL write_lba_to_slave[D3]
|
| 413 |
|
|
8C check_for_a_file:
|
| 414 |
|
|
8C 83E8 CALL read_word_from_slave[E8]
|
| 415 |
|
|
8D ; (sD) data[7:0] WB MASTER -> (s6) TEMPORAL REGISTER
|
| 416 |
|
|
8D C6D0 LOAD s6, sD
|
| 417 |
|
|
8E CF60 LOAD sF, s6
|
| 418 |
|
|
8F CFF1 AND sF, sF
|
| 419 |
|
|
90 ; if sF=0 the is not directory => error
|
| 420 |
|
|
90 91F2 JUMP Z, put_error_code[F2]
|
| 421 |
|
|
91 ;
|
| 422 |
|
|
91 ; check that is not a deleted entry
|
| 423 |
|
|
91 ;
|
| 424 |
|
|
91 ; (sD) data[7:0] WB MASTER -> (s6) TEMPORAL REGISTER
|
| 425 |
|
|
91 0FE5 LOAD sF, E5
|
| 426 |
|
|
92 CF61 AND sF, s6
|
| 427 |
|
|
93 ; if s6=E5 is a deteled entry => check for new one (offset => sF)
|
| 428 |
|
|
93 919D JUMP Z, check_next_directory_entry[9D]
|
| 429 |
|
|
94 check_attribute:
|
| 430 |
|
|
94 ; ATTRIBUTE -> OFFSET Bh
|
| 431 |
|
|
94 ; check that is not a directory or LONG NAME
|
| 432 |
|
|
94 ; 00arshdv - DV for long name - D for directory
|
| 433 |
|
|
94 ; (sD) data[7:0] WB MASTER -> (s6) TEMPORAL REGISTER
|
| 434 |
|
|
94 0F04 LOAD sF, 04
|
| 435 |
|
|
95 83E3 CALL do_dummy_reads_from_slave[E3]
|
| 436 |
|
|
96 83E8 CALL read_word_from_slave[E8]
|
| 437 |
|
|
97 C6E0 LOAD s6, sE
|
| 438 |
|
|
98 0F03 LOAD sF, 03
|
| 439 |
|
|
99 CF61 AND sF, s6
|
| 440 |
|
|
9A 959F JUMP NZ, check_next_directory_entry_attribute[9F]
|
| 441 |
|
|
9B ; if s6=0 that is not a file => error
|
| 442 |
|
|
9B ;JUMP Z,check_next_directory_entry
|
| 443 |
|
|
9B ; check that is not a directory
|
| 444 |
|
|
9B ; check that is a file (short filename entry)
|
| 445 |
|
|
9B ; in other case error
|
| 446 |
|
|
9B ;
|
| 447 |
|
|
9B ;
|
| 448 |
|
|
9B ; READ CLUSTER INFORMATION FOR THE FILE
|
| 449 |
|
|
9B ;
|
| 450 |
|
|
9B 83A2 CALL read_dir_cluster_hi_cluster_low[A2]
|
| 451 |
|
|
9C 8080 RETURN
|
| 452 |
|
|
9D check_next_directory_entry:
|
| 453 |
|
|
9D ; go fwd 11 words
|
| 454 |
|
|
9D 0F05 LOAD sF, 05
|
| 455 |
|
|
9E 83E3 CALL do_dummy_reads_from_slave[E3]
|
| 456 |
|
|
9F check_next_directory_entry_attribute:
|
| 457 |
|
|
9F ; go fwd 5 words
|
| 458 |
|
|
9F 0F0A LOAD sF, 0A
|
| 459 |
|
|
A0 83E3 CALL do_dummy_reads_from_slave[E3]
|
| 460 |
|
|
A1 818C JUMP check_for_a_file[8C]
|
| 461 |
|
|
A2 read_dir_cluster_hi_cluster_low:
|
| 462 |
|
|
A2 ; INPUT :
|
| 463 |
|
|
A2 ; before arrive here first two bytes of the directory
|
| 464 |
|
|
A2 ; structure must be readed
|
| 465 |
|
|
A2 ; OUTPUT :
|
| 466 |
|
|
A2 ; s0,s1 : CLUS_LOW
|
| 467 |
|
|
A2 ; s2,s3 : CLUS_HI
|
| 468 |
|
|
A2 ;
|
| 469 |
|
|
A2 ; READ -> cluster_HI (OFFSET 0x14)
|
| 470 |
|
|
A2 ;
|
| 471 |
|
|
A2 ; offset 0x14 (20) => READ 18 bytes -> 9(0x09) words
|
| 472 |
|
|
A2 ;
|
| 473 |
|
|
A2 0F04 LOAD sF, 04
|
| 474 |
|
|
A3 83E3 CALL do_dummy_reads_from_slave[E3]
|
| 475 |
|
|
A4 ; (sD) data[7:0] WB MASTER -> s2
|
| 476 |
|
|
A4 ; (sE) data[7:0] WB MASTER -> s3
|
| 477 |
|
|
A4 ; READ 2 BYTES
|
| 478 |
|
|
A4 83E8 CALL read_word_from_slave[E8]
|
| 479 |
|
|
A5 C2D0 LOAD s2, sD
|
| 480 |
|
|
A6 C3E0 LOAD s3, sE
|
| 481 |
|
|
A7 EE0F OUTPUT sE, TMP_OUT_7[0F]
|
| 482 |
|
|
A8 ;
|
| 483 |
|
|
A8 ; READ -> cluster_low(OFFSET 0x1A)
|
| 484 |
|
|
A8 ;
|
| 485 |
|
|
A8 ; offset 0x1A (26) => READ 4 bytes -> 2(0x02) words
|
| 486 |
|
|
A8 ;
|
| 487 |
|
|
A8 0F02 LOAD sF, 02
|
| 488 |
|
|
A9 83E3 CALL do_dummy_reads_from_slave[E3]
|
| 489 |
|
|
AA ; (sD) data[7:0] WB MASTER -> s0
|
| 490 |
|
|
AA ; (sE) data[7:0] WB MASTER -> s1
|
| 491 |
|
|
AA ; READ 2 BYTES
|
| 492 |
|
|
AA 83E8 CALL read_word_from_slave[E8]
|
| 493 |
|
|
AB C0D0 LOAD s0, sD
|
| 494 |
|
|
AC C1E0 LOAD s1, sE
|
| 495 |
|
|
AD ; s0,s1 clus_low s3,s4 - clus_high
|
| 496 |
|
|
AD 8080 RETURN
|
| 497 |
|
|
AE ; -- MBR READ OPERATION - LBA BEGIN DETERMINATION
|
| 498 |
|
|
AE ; '00' -> LBA_7_0,LBA_15_8,LBA_23_16,LD_LBA_27_24
|
| 499 |
|
|
AE cluster_2_lba:
|
| 500 |
|
|
AE ; --
|
| 501 |
|
|
AE ; -- LBA ADDRESS DETERMINATION
|
| 502 |
|
|
AE ; --
|
| 503 |
|
|
AE ; lba_addr = cluster_begin_lba + (cluster_number - 2) * sectors_per_cluster;
|
| 504 |
|
|
AE ;
|
| 505 |
|
|
AE ; INPUT :
|
| 506 |
|
|
AE ; s0 : CLUSTER_NUMBER0, s1 : CLUSTER_NUMBER1, s2: CLUSTER_NUMBER2, s3 : CLUSTER_NUMBER3
|
| 507 |
|
|
AE ; OUTPUT :
|
| 508 |
|
|
AE ; s0 : LBA_ADDR_7_0 TMP1, s1 : LBA_ADDR_15_8, s2 : LBA_ADDR_24_16, s3 : LBA_ADDR_27_24
|
| 509 |
|
|
AE ;
|
| 510 |
|
|
AE ; cluster_number - 2
|
| 511 |
|
|
AE ;
|
| 512 |
|
|
AE E00C OUTPUT s0, TMP_OUT_4[0C]
|
| 513 |
|
|
AF E10D OUTPUT s1, TMP_OUT_5[0D]
|
| 514 |
|
|
B0 E20E OUTPUT s2, TMP_OUT_6[0E]
|
| 515 |
|
|
B1 E30F OUTPUT s3, TMP_OUT_7[0F]
|
| 516 |
|
|
B2 6002 SUB s0, 02
|
| 517 |
|
|
B3 7100 SUBCY s1, 00
|
| 518 |
|
|
B4 7200 SUBCY s2, 00
|
| 519 |
|
|
B5 7300 SUBCY s3, 00
|
| 520 |
|
|
B6 ;
|
| 521 |
|
|
B6 ; (cluster_number - 2) * sectors_per_cluster(s7);
|
| 522 |
|
|
B6 ;
|
| 523 |
|
|
B6 ; to perform the multiplication as sector_per_cluster is 2 multiple must be known
|
| 524 |
|
|
B6 ; who many times must be shifted
|
| 525 |
|
|
B6 ; (use sD as temporal register)
|
| 526 |
|
|
B6 0F08 LOAD sF, 08
|
| 527 |
|
|
B7 CD70 LOAD sD, s7
|
| 528 |
|
|
B8 multiply:
|
| 529 |
|
|
B8 DD0E SR0 sD
|
| 530 |
|
|
B9 ; loop until detection of the 1 (2 multiple) - Add timeout!!!
|
| 531 |
|
|
B9 99BF JUMP C, add_cluster_begin_lba[BF]
|
| 532 |
|
|
BA ; LSB '0'
|
| 533 |
|
|
BA D006 SL0 s0
|
| 534 |
|
|
BB ; CARRY -> LSB , MSB -> CARRY
|
| 535 |
|
|
BB D100 SLA s1
|
| 536 |
|
|
BC D200 SLA s2
|
| 537 |
|
|
BD D300 SLA s3
|
| 538 |
|
|
BE 81B8 JUMP multiply[B8]
|
| 539 |
|
|
BF add_cluster_begin_lba:
|
| 540 |
|
|
BF ; lba_addr (TMP0,TMP1,TMP2,TMP3)= cluster_begin_lba + (cluster_number - 2) * sectors_per_cluster;
|
| 541 |
|
|
BF C084 ADD s0, s8
|
| 542 |
|
|
C0 C195 ADDCY s1, s9
|
| 543 |
|
|
C1 C2A5 ADDCY s2, sA
|
| 544 |
|
|
C2 C3B5 ADDCY s3, sB
|
| 545 |
|
|
C3 8080 RETURN
|
| 546 |
|
|
C4 ; --
|
| 547 |
|
|
C4 ; -- WRITE A WORD INTO THE WB SLAVE INTERFACE (TO THE MASTER)
|
| 548 |
|
|
C4 ; --
|
| 549 |
|
|
C4 ; INPUTS :
|
| 550 |
|
|
C4 ; TMP0 : LSB TO DATA_WB_OUT_7_0_SLAVE
|
| 551 |
|
|
C4 ; TMP1 : MSB TO DATA_WB_OUT_15_8_SLAVE
|
| 552 |
|
|
C4 ;
|
| 553 |
|
|
C4 write_a_word_to_master:
|
| 554 |
|
|
C4 ; TMP0 => DATA_WB_OUT_7_0_SLAVE
|
| 555 |
|
|
C4 ED03 OUTPUT sD, DATA_WB_OUT_7_0_SLAVE[03]
|
| 556 |
|
|
C5 ; 00 => DATA_WB_OUT_15_8_SLAVE
|
| 557 |
|
|
C5 ;LOAD sF,00 -- 8 BIT VERSION
|
| 558 |
|
|
C5 ;OUTPUT sF,DATA_WB_OUT_15_8_SLAVE -- 8 BIT VERSION
|
| 559 |
|
|
C5 EE04 OUTPUT sE, DATA_WB_OUT_15_8_SLAVE[04]
|
| 560 |
|
|
C6 83CB CALL write_a_byte_to_master[CB]
|
| 561 |
|
|
C7 ;
|
| 562 |
|
|
C7 ; CHECK STB INPUT | CONTROL_WB_IN_SLAVE-> TMP (s6)
|
| 563 |
|
|
C7 ;
|
| 564 |
|
|
C7 wait_strobe:
|
| 565 |
|
|
C7 A601 INPUT s6, CONTROL_WB_IN_SLAVE[01]
|
| 566 |
|
|
C8 ;
|
| 567 |
|
|
C8 ;
|
| 568 |
|
|
C8 1601 AND s6, STB_I_SLAVE[01]
|
| 569 |
|
|
C9 91C7 JUMP Z, wait_strobe[C7]
|
| 570 |
|
|
CA ; TMP1 => DATA_WB_OUT_7_0_SLAVE
|
| 571 |
|
|
CA ; OUTPUT sE,DATA_WB_OUT_7_0_SLAVE
|
| 572 |
|
|
CA ; 00 =>DATA_WB_OUT_15_8_SLAVE
|
| 573 |
|
|
CA ;LOAD sF,00 -- 8 BIT VERSION
|
| 574 |
|
|
CA ;OUTPUT sF,DATA_WB_OUT_15_8_SLAVE -- 8 BIT VERSION
|
| 575 |
|
|
CA ;CALL write_a_byte_to_master -- 8 BIT VERSION
|
| 576 |
|
|
CA 8080 RETURN
|
| 577 |
|
|
CB write_a_byte_to_master:
|
| 578 |
|
|
CB ;
|
| 579 |
|
|
CB ; WB SLAVE WRITE ENABLE ACTIVE
|
| 580 |
|
|
CB ;
|
| 581 |
|
|
CB 0F01 LOAD sF, WB_BUS_SLAVE_WRITE_ENABLE[01]
|
| 582 |
|
|
CC EF07 OUTPUT sF, CONTROL_OUT_SLAVE[07]
|
| 583 |
|
|
CD ;
|
| 584 |
|
|
CD ; ACK TO THE MASTER UNTIL STB FINISH
|
| 585 |
|
|
CD ;
|
| 586 |
|
|
CD ack_to_the_master:
|
| 587 |
|
|
CD 0F01 LOAD sF, ACK_O_SLAVE[01]
|
| 588 |
|
|
CE EF05 OUTPUT sF, CONTROL_WB_OUT_SLAVE[05]
|
| 589 |
|
|
CF ;
|
| 590 |
|
|
CF ;
|
| 591 |
|
|
CF 0F00 LOAD sF, 00
|
| 592 |
|
|
D0 EF07 OUTPUT sF, CONTROL_OUT_SLAVE[07]
|
| 593 |
|
|
D1 EF05 OUTPUT sF, CONTROL_WB_OUT_SLAVE[05]
|
| 594 |
|
|
D2 8080 RETURN
|
| 595 |
|
|
D3 ; --
|
| 596 |
|
|
D3 ; -- WRITE A LBA INTO THE WB MASTER INTERFACE (TO THE SLAVE)
|
| 597 |
|
|
D3 ; --
|
| 598 |
|
|
D3 ; INPUTS :
|
| 599 |
|
|
D3 ; TMP0 : LBA_ADDR_7_0, TMP1 : LBA_ADDR_15_8, TMP2 : LBA_ADDR_24_16, TMP3 : LBA_ADDR_27_24
|
| 600 |
|
|
D3 ;
|
| 601 |
|
|
D3 ;
|
| 602 |
|
|
D3 write_lba_to_slave:
|
| 603 |
|
|
D3 ;
|
| 604 |
|
|
D3 ; WB MASTER WRITE ENABLE ACTIVE
|
| 605 |
|
|
D3 ;
|
| 606 |
|
|
D3 0F01 LOAD sF, WB_BUS_MASTER_WRITE_ENABLE[01]
|
| 607 |
|
|
D4 EF06 OUTPUT sF, CONTROL_OUT_MASTER[06]
|
| 608 |
|
|
D5
|
| 609 |
|
|
D5 ;write_lba_15_0_to_slave:
|
| 610 |
|
|
D5 ;
|
| 611 |
|
|
D5 ; TMP0 : LBA_ADDR_7_0 (s0) => DATA_WB_OUT_7_0_MASTER
|
| 612 |
|
|
D5 ; TMP1 : LBA_ADDR_15_8 (s1) => DATA_WB_OUT_15_8_MASTER
|
| 613 |
|
|
D5 ;
|
| 614 |
|
|
D5 E000 OUTPUT s0, DATA_WB_OUT_7_0_MASTER[00]
|
| 615 |
|
|
D6 E101 OUTPUT s1, DATA_WB_OUT_15_8_MASTER[01]
|
| 616 |
|
|
D7 ;
|
| 617 |
|
|
D7 ; --
|
| 618 |
|
|
D7 ; -- WRITE LBA 15-0 TO THE SLAVE
|
| 619 |
|
|
D7 ; --
|
| 620 |
|
|
D7 ;
|
| 621 |
|
|
D7 ; WB_CONTROL_OUT_MASTER
|
| 622 |
|
|
D7 ; W_WE_MASTER = 1
|
| 623 |
|
|
D7 ; STB_O_MASTER = 1
|
| 624 |
|
|
D7 ; A0 = 0
|
| 625 |
|
|
D7 ;
|
| 626 |
|
|
D7 0F03 LOAD sF, WRITE_LBA_15_0[03]
|
| 627 |
|
|
D8 EF02 OUTPUT sF, CONTROL_WB_OUT_MASTER[02]
|
| 628 |
|
|
D9 ;
|
| 629 |
|
|
D9 ; WAIT FOR THE ACK
|
| 630 |
|
|
D9 ;
|
| 631 |
|
|
D9 83EA CALL wait_for_the_ack[EA]
|
| 632 |
|
|
DA ;write_lba_27_16_to_slave:
|
| 633 |
|
|
DA ;
|
| 634 |
|
|
DA ; TMP2 : LBA_ADDR_23_16 (s2) => DATA_WB_OUT_7_0_MASTER
|
| 635 |
|
|
DA ; TMP3 : LBA_ADDR_27_24 (s3) => DATA_WB_OUT_15_8_MASTER
|
| 636 |
|
|
DA ;
|
| 637 |
|
|
DA E200 OUTPUT s2, DATA_WB_OUT_7_0_MASTER[00]
|
| 638 |
|
|
DB E301 OUTPUT s3, DATA_WB_OUT_15_8_MASTER[01]
|
| 639 |
|
|
DC
|
| 640 |
|
|
DC ; --
|
| 641 |
|
|
DC ; -- WRITE LBA 27-16 TO THE SLAVE
|
| 642 |
|
|
DC ; --
|
| 643 |
|
|
DC ; WB_CONTROL_OUT_MASTER
|
| 644 |
|
|
DC ; W_WE_MASTER = 1
|
| 645 |
|
|
DC ; STB_O_MASTER = 1
|
| 646 |
|
|
DC ; A0 = 0
|
| 647 |
|
|
DC ;
|
| 648 |
|
|
DC 0F07 LOAD sF, WRITE_LBA_27_16[07]
|
| 649 |
|
|
DD EF02 OUTPUT sF, CONTROL_WB_OUT_MASTER[02]
|
| 650 |
|
|
DE ;
|
| 651 |
|
|
DE ; WAIT FOR THE ACK
|
| 652 |
|
|
DE ;
|
| 653 |
|
|
DE 83EA CALL wait_for_the_ack[EA]
|
| 654 |
|
|
DF ; --
|
| 655 |
|
|
DF ; -- FINISH WRITE OPERATION ON THE MASTER WB INTERFACE
|
| 656 |
|
|
DF ; --
|
| 657 |
|
|
DF ;
|
| 658 |
|
|
DF ; WB_CONTROL_OUT_MASTER
|
| 659 |
|
|
DF ; W_WE_MASTER = 0
|
| 660 |
|
|
DF ; STB_O_MASTER = 0
|
| 661 |
|
|
DF ; A0 = 0
|
| 662 |
|
|
DF ;
|
| 663 |
|
|
DF 0F00 LOAD sF, 00
|
| 664 |
|
|
E0 EF02 OUTPUT sF, CONTROL_WB_OUT_MASTER[02]
|
| 665 |
|
|
E1 EF06 OUTPUT sF, CONTROL_OUT_MASTER[06]
|
| 666 |
|
|
E2 8080 RETURN
|
| 667 |
|
|
E3 ; --
|
| 668 |
|
|
E3 ; -- PERFORM DUMMY READS FROM THE WB SLAVE
|
| 669 |
|
|
E3 ; --
|
| 670 |
|
|
E3 ; -- IN sF ARE THE NUMBER OF WORDS THAT MUST BE READED
|
| 671 |
|
|
E3 ; --
|
| 672 |
|
|
E3 do_dummy_reads_from_slave:
|
| 673 |
|
|
E3 C6F0 LOAD s6, sF
|
| 674 |
|
|
E4 dummy_reads_from_slave:
|
| 675 |
|
|
E4 83E8 CALL read_word_from_slave[E8]
|
| 676 |
|
|
E5 6601 SUB s6, 01
|
| 677 |
|
|
E6 95E4 JUMP NZ, dummy_reads_from_slave[E4]
|
| 678 |
|
|
E7 8080 RETURN
|
| 679 |
|
|
E8
|
| 680 |
|
|
E8 ; --
|
| 681 |
|
|
E8 ; -- PERFORM A WORD READING FROM THE WB SLAVE
|
| 682 |
|
|
E8 ; --
|
| 683 |
|
|
E8 read_word_from_slave:
|
| 684 |
|
|
E8 ; WB_CONTROL_OUT_MASTER
|
| 685 |
|
|
E8 ; W_WE_MASTER = 0
|
| 686 |
|
|
E8 ; STB_O_MASTER = 1
|
| 687 |
|
|
E8 ; A0 = 0
|
| 688 |
|
|
E8 ; wait state
|
| 689 |
|
|
E8 0F01 LOAD sF, READ_SLAVE[01]
|
| 690 |
|
|
E9 EF02 OUTPUT sF, CONTROL_WB_OUT_MASTER[02]
|
| 691 |
|
|
EA ;
|
| 692 |
|
|
EA ; WAIT FOR THE ACK
|
| 693 |
|
|
EA ;
|
| 694 |
|
|
EA ; CALL wait_for_the_ack
|
| 695 |
|
|
EA ;JUMP Z,data_available_on_wb_master
|
| 696 |
|
|
EA wait_for_the_ack:
|
| 697 |
|
|
EA ;
|
| 698 |
|
|
EA ; CONTROL_WB_IN_MASTER -> TMP (s6)
|
| 699 |
|
|
EA ;
|
| 700 |
|
|
EA AF00 INPUT sF, CONTROL_WB_IN_MASTER[00]
|
| 701 |
|
|
EB ;
|
| 702 |
|
|
EB 1F01 AND sF, ACK_I_MASTER[01]
|
| 703 |
|
|
EC 91EA JUMP Z, wait_for_the_ack[EA]
|
| 704 |
|
|
ED data_available_on_wb_master:
|
| 705 |
|
|
ED ; This part is not necessary in write operations
|
| 706 |
|
|
ED ; DATA_WB_IN_7_0_MASTER -> (sD) data[7:0] WB MASTER
|
| 707 |
|
|
ED ; DATA_WB_IN_15_8_MASTER -> (sE) data[15:8] WB MASTER
|
| 708 |
|
|
ED AD02 INPUT sD, DATA_WB_IN_7_0_MASTER[02]
|
| 709 |
|
|
EE AE03 INPUT sE, DATA_WB_IN_15_8_MASTER[03]
|
| 710 |
|
|
EF ; DISABLE RD/WR OPERATION REQUEST
|
| 711 |
|
|
EF 0F00 LOAD sF, 00
|
| 712 |
|
|
F0 EF02 OUTPUT sF, CONTROL_WB_OUT_MASTER[02]
|
| 713 |
|
|
F1 8080 RETURN
|
| 714 |
|
|
F2 put_error_code:
|
| 715 |
|
|
F2 0F04 LOAD sF, ERROR[04]
|
| 716 |
|
|
F3 EF05 OUTPUT sF, CONTROL_WB_OUT_SLAVE[05]
|
| 717 |
|
|
F4 81F2 JUMP put_error_code[F2]
|
| 718 |
|
|
F5 interrupt:
|
| 719 |
|
|
F5 80F0 RETURNI ENABLE
|
