diff options
| author | Alexey 'Cluster' Avdyukhin <clusterrr@clusterrr.com> | 2020-09-17 19:48:23 +0300 |
|---|---|---|
| committer | Alexey 'Cluster' Avdyukhin <clusterrr@clusterrr.com> | 2020-09-17 19:48:23 +0300 |
| commit | c13c394c93f78d51ea4abb822d766579ae90384c (patch) | |
| tree | ca79b99ed54259e7366b37f6af503f05ad4828eb /flash.asm | |
| parent | a95ef293d4c49ac8cc15f1e52000d6548c794990 (diff) | |
Spaces
Diffstat (limited to 'flash.asm')
| -rw-r--r-- | flash.asm | 213 |
1 files changed, 122 insertions, 91 deletions
@@ -1,104 +1,135 @@ - ; субрутины для работы с флеш-памятью - ; OMG, это работает! -flash_writer: + ; subroutines for flash memory stuff + ; OMG, это работает! + +FLASH_TYPE .rs 1 ; flash memory type + +flash_detect: + lda #%00001111 ; mirroring, flash-write, chr-write, enable sram + sta $5007 ; to enable flash writes + lda #$F0 + sta $8000 + lda #0 + sta <FLASH_TYPE + lda #$98 + sta $8AAA + lda $8020 + cmp #'Q' + bne .end + lda $8022 + cmp #'R' + bne .end + lda $8024 + cmp #'I' + bne .end + lda $804E + sta <FLASH_TYPE +.end: + lda #$F0 + sta $8000 + lda #%00001011 ; mirroring, chr-write, enable sram + sta $5007 ; to disable flash writes + rts + sector_erase: - jsr flash_set_superbank - lda #%00001111 ; mirroring, flash-write, chr-write, enable sram - sta $5007 ; to enable flash writes - - lda #$F0 - sta $8000 ; write_prg_flash_command(0x0000, 0xF0); - lda #$AA - sta $8AAA ; write_prg_flash_command(0x0AAA, 0xAA); - lda #$55 - sta $8555 ; write_prg_flash_command(0x0555, 0x55); - lda #$80 - sta $8AAA ; write_prg_flash_command(0x0AAA, 0x80); - lda #$AA - sta $8AAA ; write_prg_flash_command(0x0AAA, 0xAA); - lda #$55 - sta $8555 ; write_prg_flash_command(0x0555, 0x55); - lda #$30 - sta $8000 ; write_prg_flash_command(0x0000, 0x30); + jsr flash_set_superbank + lda #%00001111 ; mirroring, flash-write, chr-write, enable sram + sta $5007 ; to enable flash writes + + lda #$F0 + sta $8000 ; write_prg_flash_command(0x0000, 0xF0); + lda #$AA + sta $8AAA ; write_prg_flash_command(0x0AAA, 0xAA); + lda #$55 + sta $8555 ; write_prg_flash_command(0x0555, 0x55); + lda #$80 + sta $8AAA ; write_prg_flash_command(0x0AAA, 0x80); + lda #$AA + sta $8AAA ; write_prg_flash_command(0x0AAA, 0xAA); + lda #$55 + sta $8555 ; write_prg_flash_command(0x0555, 0x55); + lda #$30 + sta $8000 ; write_prg_flash_command(0x0000, 0x30); - lda #%00001011 ; mirroring, chr-write, enable sram - sta $5007 ; to disable flash writes - + lda #%00001011 ; mirroring, chr-write, enable sram + sta $5007 ; to disable flash writes + wait_for_sector_erase: - lda $8000 - cmp #$FF - bne wait_for_sector_erase - jsr flash_set_superbank_zero - rts - + lda $8000 + cmp #$FF + bne wait_for_sector_erase + jsr flash_set_superbank_zero + rts + write_flash: - jsr flash_set_superbank - lda #%00001111 ; mirroring, flash-write, chr-write, enable sram - sta $5007 ; включаем запись в PRG - ldy #$00 - ldx #$20 + jsr flash_set_superbank + lda #%00001111 ; mirroring, flash-write, chr-write, enable sram + sta $5007 ; включаем запись в PRG + ldy #$00 + ldx #$20 write_flash_loop: - lda #$F0 - sta $8000 ; write_prg_flash_command(0x0000, 0xF0); - lda #$AA - sta $8AAA ; write_prg_flash_command(0x0AAA, 0xAA); - lda #$55 - sta $8555 ; write_prg_flash_command(0x0555, 0x55); - lda #$A0 - sta $8AAA ; write_prg_flash_command(0x0AAA, 0xA0); - lda [COPY_SOURCE_ADDR], y - sta [COPY_DEST_ADDR], y + lda #$F0 + sta $8000 ; write_prg_flash_command(0x0000, 0xF0); + lda #$AA + sta $8AAA ; write_prg_flash_command(0x0AAA, 0xAA); + lda #$55 + sta $8555 ; write_prg_flash_command(0x0555, 0x55); + lda #$A0 + sta $8AAA ; write_prg_flash_command(0x0AAA, 0xA0); + lda [COPY_SOURCE_ADDR], y + sta [COPY_DEST_ADDR], y write_flash_check1: - lda [COPY_DEST_ADDR], y - cmp [COPY_SOURCE_ADDR], y - bne write_flash_check1 + lda [COPY_DEST_ADDR], y + cmp [COPY_SOURCE_ADDR], y + bne write_flash_check1 write_flash_check2: - lda [COPY_DEST_ADDR], y - cmp [COPY_SOURCE_ADDR], y - bne write_flash_check2 - iny - bne write_flash_loop - inc COPY_SOURCE_ADDR+1 - inc COPY_DEST_ADDR+1 - dex - bne write_flash_loop - lda #%00001011 ; mirroring, chr-write, enable sram - sta $5007 ; to disable flash writes - jsr flash_set_superbank_zero - rts + lda [COPY_DEST_ADDR], y + cmp [COPY_SOURCE_ADDR], y + bne write_flash_check2 + iny + bne write_flash_loop + inc COPY_SOURCE_ADDR+1 + inc COPY_DEST_ADDR+1 + dex + bne write_flash_loop + lda #%00001011 ; mirroring, chr-write, enable sram + sta $5007 ; to disable flash writes + jsr flash_set_superbank_zero + rts read_flash: - jsr flash_set_superbank - ldy #0 - ldx #$20 + jsr flash_set_superbank + ldy #0 + ldx #$20 load_save_again: - lda [COPY_SOURCE_ADDR], y - sta [COPY_DEST_ADDR], y - iny - bne load_save_again - inc COPY_SOURCE_ADDR+1 - inc COPY_DEST_ADDR+1 - dex - bne load_save_again - jsr flash_set_superbank_zero - rts - + lda [COPY_SOURCE_ADDR], y + sta [COPY_DEST_ADDR], y + iny + bne load_save_again + inc COPY_SOURCE_ADDR+1 + inc COPY_DEST_ADDR+1 + dex + bne load_save_again + jsr flash_set_superbank_zero + rts + flash_set_superbank: - ldx LOADER_GAME_SAVE_SUPERBANK - inx - lda #$FF - sta $5000 - lda #$00 -flash_set_superbank_calc_next: - sec - sbc #$02 - dex - bne flash_set_superbank_calc_next - sta $5001 - rts + ldx LOADER_GAME_SAVE_SUPERBANK + inx + lda #$FF + sta $5000 + lda #$00 +flash_set_superbank_calc_next: + sec + sbc #$02 + dex + bne flash_set_superbank_calc_next + sta $5001 + rts flash_set_superbank_zero: - lda #$00 - sta $5000 - sta $5001 - rts + lda #$00 + sta $5000 + sta $5001 + lda #%11111000 + sta $5002 + rts |