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216 lines
3.2 KiB
ArmAsm
216 lines
3.2 KiB
ArmAsm
*
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* AppleSqueezer in 16-bit assembly
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*
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* (c) 2022, Niek van Suchtelen
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* (a) 2022, Brutal Deluxe Software
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*
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mx %00
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lst off
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*-----------------------------------
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* SPI FLASH OPERATIONS
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*-----------------------------------
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*-----------
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isAppleSqueezer
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ldal FL_IDLE
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and #$ff
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cmp #TRUE ; if AS is present
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rts
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*-----------
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coreVersion
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ldal FL_VERSION
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and #$ff
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rts
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*-----------
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chipSelect
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sep #$20 ; 8-bit A
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stal FL_CS
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rep #$20 ; 16-bit A
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rts
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*-----------
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waitIdle
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ldal FL_IDLE
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and #$ff
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beq waitIdle
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rts
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*-----------
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waitReadReady
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ldal FL_READY
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and #$ff
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beq waitReadReady
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rts
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*-----------
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flashWrite
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sep #$20 ; 8-bit A
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stal FL_WRITE
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rep #$20 ; 16-bit A
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jmp waitIdle
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*-----------
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flashRead
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jsr waitIdle
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sep #$20
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lda #0
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stal FL_READ_REQUEST
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rep #$20
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jsr waitIdle
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jsr waitReadReady
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ldal FL_READ
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and #$ff
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rts
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*-----------
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writeEnable
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lda #0
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jsr chipSelect
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lda #CMD_WRITE_ENABLE
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jsr flashWrite
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lda #1
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jmp chipSelect
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*-----------
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* before sectorErase, call writeEnable
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sectorErase
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lda #0
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jsr chipSelect
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lda #CMD_SECTOR_ERASE
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jsr flashWrite
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lda #$0f ; sector 15: 000F 0000 - 000F EFFF
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jsr flashWrite
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lda #0
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jsr flashWrite
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lda #0
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jsr flashWrite
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lda #1
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jmp chipSelect
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*-----------
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* before bulkErase, call writeEnable
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bulkErase
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lda #0
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jsr chipSelect
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lda #CMD_BULK_ERASE
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jsr flashWrite
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lda #1
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jmp chipSelect
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*-----------
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* before pageProgramSingle, call writeEnable
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pageProgramSingle
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pha ; save data
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lda #0
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jsr chipSelect
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lda #CMD_PAGE_PROGRAM
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jsr flashWrite
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* address
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lda #$0f ; sector 15: 000F 0000 - 000F EFFF
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jsr flashWrite
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lda #0
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jsr flashWrite
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lda #0
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jsr flashWrite
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* data
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pla ; restore data
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jsr flashWrite
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lda #1
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jmp chipSelect
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*----------- TO DO - Use the stack I think
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* before pageProgram, call writeEnable
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pageProgram
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rts
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*-----------
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readStateRegister
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lda #0
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jsr chipSelect
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lda #CMD_READ_STATUS_REGISTER
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jsr flashWrite
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jsr flashRead
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pha
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lda #1
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jsr chipSelect
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pla
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rts
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*-----------
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writeInProgress
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jsr readStateRegister ; WIP - write in progress bit
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and #%00000000_00000001 ; if 1, write is in progress
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cmp #TRUE
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rts ; return TRUE if write is in progress
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*-----------
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writeEnabled
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jsr readStateRegister ; WEL - write enable latch bit
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and #%00000000_00000010 ; if 1, write is enabled
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lsr ; move bit 1 in bit 0 for comparison
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cmp #TRUE
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rts ; return TRUE is write is enabled
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*-----------
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readDataBytes
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pha ; save address
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lda #0
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jsr chipSelect
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lda #CMD_READ_DATA_BYTES
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jsr flashWrite
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* address
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lda #$0f ; sector 15: 000F 0000 - 000F EFFF
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jsr flashWrite
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lda #0
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jsr flashWrite
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pla ; restore address
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jsr flashWrite
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* read data
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jsr flashRead
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pha
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lda #1
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jsr chipSelect
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pla
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rts
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*-----------
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loadValues
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lda #0 ; read byte at address $0F/0000
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jsr readDataBytes
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sta data
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rts
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*-----------
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storeValues
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jsr writeEnable
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]lp jsr writeEnabled ; FALSE if not possible to write
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bne ]lp
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jsr sectorErase
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]lp jsr writeInProgress ; TRUE if write in progress
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beq ]lp
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jsr writeEnable
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]lp jsr writeEnabled ; FALSE if not possible to write
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bne ]lp
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lda data
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jsr pageProgramSingle ; CDA/NDA harmonization
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]lp jsr writeInProgress ; TRUE if write in progress
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beq ]lp
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rts
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*----------- DATA
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data ds 2 |