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| Original file line number | Diff line number | Diff line change |
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| ; Raspberry Pi 2 'Bare Metal' 8BPP Hello World Demo by krom (Peter Lemon): | ||
| ; 1. Setup Frame Buffer | ||
| ; 2. Copy Hello World Text Characters To Frame Buffer Using CPU | ||
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| format binary as 'img' | ||
| include 'LIB\FASMARM.INC' | ||
| include 'LIB\R_PI2.INC' | ||
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| ; Setup Frame Buffer | ||
| SCREEN_X = 640 | ||
| SCREEN_Y = 480 | ||
| BITS_PER_PIXEL = 8 | ||
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| ; Setup Characters | ||
| CHAR_X = 8 | ||
| CHAR_Y = 8 | ||
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| org $8000 | ||
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| FB_Init: | ||
| imm32 r0,FB_STRUCT + MAIL_TAGS | ||
| imm32 r1,PERIPHERAL_BASE + MAIL_BASE + MAIL_WRITE + MAIL_TAGS | ||
| str r0,[r1] ; Mail Box Write | ||
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| ldr r0,[FB_POINTER] ; R0 = Frame Buffer Pointer | ||
| cmp r0,0 ; Compare Frame Buffer Pointer To Zero | ||
| beq FB_Init ; IF Zero Re-Initialize Frame Buffer | ||
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| ; Draw Characters | ||
| imm32 r1,256 + (SCREEN_X * 32) | ||
| add r0,r1 ; Place Text At XY Position 256,32 | ||
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| adr r1,Font ; R1 = Characters | ||
| adr r2,Text ; R2 = Text Offset | ||
| mov r3,12 ; R3 = Number Of Text Characters To Print | ||
| DrawChars: | ||
| mov r4,CHAR_Y ; R4 = Character Row Counter | ||
| ldrb r5,[r2],1 ; R5 = Next Text Character | ||
| add r5,r1,r5,lsl 6 ; Add Shift To Correct Position In Font (* 64) | ||
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| DrawChar: | ||
| ldr r6,[r5],4 ; Load Font Text Character 1/2 Row | ||
| str r6,[r0],4 ; Store Font Text Character 1/2 Row To Frame Buffer | ||
| ldr r6,[r5],4 ; Load Font Text Character 1/2 Row | ||
| str r6,[r0],4 ; Store Font Text Character 1/2 Row To Frame Buffer | ||
| add r0,SCREEN_X ; Jump Down 1 Scanline | ||
| sub r0,CHAR_X ; Jump Back 1 Char | ||
| subs r4,1 ; Decrement Character Row Counter | ||
| bne DrawChar ; IF (Character Row Counter != 0) DrawChar | ||
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| subs r3,1 ; Subtract Number Of Text Characters To Print | ||
| subne r0,SCREEN_X * CHAR_Y ; Jump To Top Of Char | ||
| addne r0,CHAR_X ; Jump Forward 1 Char | ||
| bne DrawChars ; IF (Number Of Text Characters != 0) Continue To Print Characters | ||
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| Loop: | ||
| b Loop | ||
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| align 16 | ||
| FB_STRUCT: ; Mailbox Property Interface Buffer Structure | ||
| dw FB_STRUCT_END - FB_STRUCT ; Buffer Size In Bytes (Including The Header Values, The End Tag And Padding) | ||
| dw $00000000 ; Buffer Request/Response Code | ||
| ; Request Codes: $00000000 Process Request Response Codes: $80000000 Request Successful, $80000001 Partial Response | ||
| ; Sequence Of Concatenated Tags | ||
| dw Set_Physical_Display ; Tag Identifier | ||
| dw $00000008 ; Value Buffer Size In Bytes | ||
| dw $00000008 ; 1 bit (MSB) Request/Response Indicator (0=Request, 1=Response), 31 bits (LSB) Value Length In Bytes | ||
| dw SCREEN_X ; Value Buffer | ||
| dw SCREEN_Y ; Value Buffer | ||
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| dw Set_Virtual_Buffer ; Tag Identifier | ||
| dw $00000008 ; Value Buffer Size In Bytes | ||
| dw $00000008 ; 1 bit (MSB) Request/Response Indicator (0=Request, 1=Response), 31 bits (LSB) Value Length In Bytes | ||
| dw SCREEN_X ; Value Buffer | ||
| dw SCREEN_Y ; Value Buffer | ||
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| dw Set_Depth ; Tag Identifier | ||
| dw $00000004 ; Value Buffer Size In Bytes | ||
| dw $00000004 ; 1 bit (MSB) Request/Response Indicator (0=Request, 1=Response), 31 bits (LSB) Value Length In Bytes | ||
| dw BITS_PER_PIXEL ; Value Buffer | ||
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| dw Set_Virtual_Offset ; Tag Identifier | ||
| dw $00000008 ; Value Buffer Size In Bytes | ||
| dw $00000008 ; 1 bit (MSB) Request/Response Indicator (0=Request, 1=Response), 31 bits (LSB) Value Length In Bytes | ||
| FB_OFFSET_X: | ||
| dw 0 ; Value Buffer | ||
| FB_OFFSET_Y: | ||
| dw 0 ; Value Buffer | ||
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| dw Set_Palette ; Tag Identifier | ||
| dw $00000010 ; Value Buffer Size In Bytes | ||
| dw $00000010 ; 1 bit (MSB) Request/Response Indicator (0=Request, 1=Response), 31 bits (LSB) Value Length In Bytes | ||
| dw 0 ; Value Buffer (Offset: First Palette Index To Set (0-255)) | ||
| dw 2 ; Value Buffer (Length: Number Of Palette Entries To Set (1-256)) | ||
| FB_PAL: | ||
| dw $00000000,$FFFFFFFF ; RGBA Palette Values (Offset To Offset+Length-1) | ||
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| dw Allocate_Buffer ; Tag Identifier | ||
| dw $00000008 ; Value Buffer Size In Bytes | ||
| dw $00000008 ; 1 bit (MSB) Request/Response Indicator (0=Request, 1=Response), 31 bits (LSB) Value Length In Bytes | ||
| FB_POINTER: | ||
| dw 0 ; Value Buffer | ||
| dw 0 ; Value Buffer | ||
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| dw $00000000 ; $0 (End Tag) | ||
| FB_STRUCT_END: | ||
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| Text: | ||
| db "Hello World!" | ||
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| align 4 | ||
| Font: | ||
| include 'Font8x8.asm' |
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