Started working on characters
This commit is contained in:
Daniele Verducci (ZenPenguin)
parent
17fdf97f75
commit
415300a2db
@ -4,4 +4,7 @@
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; *******************************************
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; This module generates the character pixels using the font present in rom
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; and adds it on the framebuffer in the right position.
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; and adds it on the framebuffer in the position indicated by POS_COARSE.
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; Draws character in register A to the screen at current coords
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draw_char:
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@ -8,11 +8,17 @@
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; The data port is PORTB. The CLK (clock) signal is on PORTD0
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; and the RS (register select) on PORTD1
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; INTERNAL POINTER:
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; Internally, the last screen position is represented by 24 bits in two registers:
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; POS_COARSE: Register Z (16-bit, r31 and r30): Coarse position. Points to one of the chunks
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; (character columns). 52 chunks per row, 304 rows. Used for character position, as
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; 1 chunk = 1 byte = 1 character.
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; POS_FINE: Register r24: Fine position. Represents the bit inside the chunk selected by POS_COARSE.
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; Ignored in character mode (the character is always aligned to column.)
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; Initializes and waits for a byte on PORTB
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comm_init:
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; Set Z to framebuffer start
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ldi r31, high(FRAMEBUFFER<<1)
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ldi r30, low(FRAMEBUFFER<<1)
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call cursor_pos_home ; Set cursor to 0,0
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comm_wait_byte:
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in r24, PINB ; read PORTB
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; Check continuously CLK until a LOW is found
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@ -27,3 +33,10 @@ comm_init:
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brne comm_wait_byte ; if not 0, repeat h_picture_loop
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jmp comm_init ; filled all memory: reset framebuffer position
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; Sets the cursor to 0,0 and clears fine position
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cursor_pos_home:
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; Set Z to framebuffer start
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ldi POS_COARSE_H, high(FRAMEBUFFER<<1)
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ldi POS_COARSE_L, low(FRAMEBUFFER<<1)
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clr POS_FINE
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ret
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@ -0,0 +1,130 @@
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; Temporary dhepper's font8x8 adaptation (https://github.com/dhepper/font8x8)
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FONT:
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.db 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, // U+0000 (nul)
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.db 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, // U+0001
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.db 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, // U+0002
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.db 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, // U+0003
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.db 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, // U+0004
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.db 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, // U+0005
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.db 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, // U+0006
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.db 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, // U+0007
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.db 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, // U+0008
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.db 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, // U+0009
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.db 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, // U+000A
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.db 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, // U+000B
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.db 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, // U+000C
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.db 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, // U+000D
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.db 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, // U+000E
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.db 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, // U+000F
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.db 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, // U+0010
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.db 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, // U+0011
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.db 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, // U+0012
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.db 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, // U+0013
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.db 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, // U+0014
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.db 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, // U+0015
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.db 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, // U+0016
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.db 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, // U+0017
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.db 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, // U+0018
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.db 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, // U+0019
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.db 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, // U+001A
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.db 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, // U+001B
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.db 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, // U+001C
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.db 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, // U+001D
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.db 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, // U+001E
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.db 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, // U+001F
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.db 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, // U+0020 (space)
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.db 0x18, 0x3C, 0x3C, 0x18, 0x18, 0x00, 0x18, 0x00, // U+0021 (!)
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.db 0x36, 0x36, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, // U+0022 (")
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.db 0x36, 0x36, 0x7F, 0x36, 0x7F, 0x36, 0x36, 0x00, // U+0023 (#)
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.db 0x0C, 0x3E, 0x03, 0x1E, 0x30, 0x1F, 0x0C, 0x00, // U+0024 ($)
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.db 0x00, 0x63, 0x33, 0x18, 0x0C, 0x66, 0x63, 0x00, // U+0025 (%)
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.db 0x1C, 0x36, 0x1C, 0x6E, 0x3B, 0x33, 0x6E, 0x00, // U+0026 (&)
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.db 0x06, 0x06, 0x03, 0x00, 0x00, 0x00, 0x00, 0x00, // U+0027 (')
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.db 0x18, 0x0C, 0x06, 0x06, 0x06, 0x0C, 0x18, 0x00, // U+0028 (()
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.db 0x06, 0x0C, 0x18, 0x18, 0x18, 0x0C, 0x06, 0x00, // U+0029 ())
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.db 0x00, 0x66, 0x3C, 0xFF, 0x3C, 0x66, 0x00, 0x00, // U+002A (*)
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.db 0x00, 0x0C, 0x0C, 0x3F, 0x0C, 0x0C, 0x00, 0x00, // U+002B (+)
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.db 0x00, 0x00, 0x00, 0x00, 0x00, 0x0C, 0x0C, 0x06, // U+002C (,)
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.db 0x00, 0x00, 0x00, 0x3F, 0x00, 0x00, 0x00, 0x00, // U+002D (-)
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.db 0x00, 0x00, 0x00, 0x00, 0x00, 0x0C, 0x0C, 0x00, // U+002E (.)
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.db 0x60, 0x30, 0x18, 0x0C, 0x06, 0x03, 0x01, 0x00, // U+002F (/)
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.db 0x3E, 0x63, 0x73, 0x7B, 0x6F, 0x67, 0x3E, 0x00, // U+0030 (0)
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.db 0x0C, 0x0E, 0x0C, 0x0C, 0x0C, 0x0C, 0x3F, 0x00, // U+0031 (1)
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.db 0x1E, 0x33, 0x30, 0x1C, 0x06, 0x33, 0x3F, 0x00, // U+0032 (2)
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.db 0x1E, 0x33, 0x30, 0x1C, 0x30, 0x33, 0x1E, 0x00, // U+0033 (3)
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.db 0x38, 0x3C, 0x36, 0x33, 0x7F, 0x30, 0x78, 0x00, // U+0034 (4)
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.db 0x3F, 0x03, 0x1F, 0x30, 0x30, 0x33, 0x1E, 0x00, // U+0035 (5)
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.db 0x1C, 0x06, 0x03, 0x1F, 0x33, 0x33, 0x1E, 0x00, // U+0036 (6)
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.db 0x3F, 0x33, 0x30, 0x18, 0x0C, 0x0C, 0x0C, 0x00, // U+0037 (7)
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.db 0x1E, 0x33, 0x33, 0x1E, 0x33, 0x33, 0x1E, 0x00, // U+0038 (8)
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.db 0x1E, 0x33, 0x33, 0x3E, 0x30, 0x18, 0x0E, 0x00, // U+0039 (9)
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.db 0x00, 0x0C, 0x0C, 0x00, 0x00, 0x0C, 0x0C, 0x00, // U+003A (:)
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.db 0x00, 0x0C, 0x0C, 0x00, 0x00, 0x0C, 0x0C, 0x06, // U+003B (;)
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.db 0x18, 0x0C, 0x06, 0x03, 0x06, 0x0C, 0x18, 0x00, // U+003C (<)
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.db 0x00, 0x00, 0x3F, 0x00, 0x00, 0x3F, 0x00, 0x00, // U+003D (=)
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.db 0x06, 0x0C, 0x18, 0x30, 0x18, 0x0C, 0x06, 0x00, // U+003E (>)
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.db 0x1E, 0x33, 0x30, 0x18, 0x0C, 0x00, 0x0C, 0x00, // U+003F (?)
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.db 0x3E, 0x63, 0x7B, 0x7B, 0x7B, 0x03, 0x1E, 0x00, // U+0040 (@)
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.db 0x0C, 0x1E, 0x33, 0x33, 0x3F, 0x33, 0x33, 0x00, // U+0041 (A)
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.db 0x3F, 0x66, 0x66, 0x3E, 0x66, 0x66, 0x3F, 0x00, // U+0042 (B)
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.db 0x3C, 0x66, 0x03, 0x03, 0x03, 0x66, 0x3C, 0x00, // U+0043 (C)
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.db 0x1F, 0x36, 0x66, 0x66, 0x66, 0x36, 0x1F, 0x00, // U+0044 (D)
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.db 0x7F, 0x46, 0x16, 0x1E, 0x16, 0x46, 0x7F, 0x00, // U+0045 (E)
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.db 0x7F, 0x46, 0x16, 0x1E, 0x16, 0x06, 0x0F, 0x00, // U+0046 (F)
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.db 0x3C, 0x66, 0x03, 0x03, 0x73, 0x66, 0x7C, 0x00, // U+0047 (G)
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.db 0x33, 0x33, 0x33, 0x3F, 0x33, 0x33, 0x33, 0x00, // U+0048 (H)
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.db 0x1E, 0x0C, 0x0C, 0x0C, 0x0C, 0x0C, 0x1E, 0x00, // U+0049 (I)
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.db 0x78, 0x30, 0x30, 0x30, 0x33, 0x33, 0x1E, 0x00, // U+004A (J)
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.db 0x67, 0x66, 0x36, 0x1E, 0x36, 0x66, 0x67, 0x00, // U+004B (K)
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.db 0x0F, 0x06, 0x06, 0x06, 0x46, 0x66, 0x7F, 0x00, // U+004C (L)
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.db 0x63, 0x77, 0x7F, 0x7F, 0x6B, 0x63, 0x63, 0x00, // U+004D (M)
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.db 0x63, 0x67, 0x6F, 0x7B, 0x73, 0x63, 0x63, 0x00, // U+004E (N)
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.db 0x1C, 0x36, 0x63, 0x63, 0x63, 0x36, 0x1C, 0x00, // U+004F (O)
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.db 0x3F, 0x66, 0x66, 0x3E, 0x06, 0x06, 0x0F, 0x00, // U+0050 (P)
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.db 0x1E, 0x33, 0x33, 0x33, 0x3B, 0x1E, 0x38, 0x00, // U+0051 (Q)
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.db 0x3F, 0x66, 0x66, 0x3E, 0x36, 0x66, 0x67, 0x00, // U+0052 (R)
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.db 0x1E, 0x33, 0x07, 0x0E, 0x38, 0x33, 0x1E, 0x00, // U+0053 (S)
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.db 0x3F, 0x2D, 0x0C, 0x0C, 0x0C, 0x0C, 0x1E, 0x00, // U+0054 (T)
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.db 0x33, 0x33, 0x33, 0x33, 0x33, 0x33, 0x3F, 0x00, // U+0055 (U)
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.db 0x33, 0x33, 0x33, 0x33, 0x33, 0x1E, 0x0C, 0x00, // U+0056 (V)
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.db 0x63, 0x63, 0x63, 0x6B, 0x7F, 0x77, 0x63, 0x00, // U+0057 (W)
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.db 0x63, 0x63, 0x36, 0x1C, 0x1C, 0x36, 0x63, 0x00, // U+0058 (X)
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.db 0x33, 0x33, 0x33, 0x1E, 0x0C, 0x0C, 0x1E, 0x00, // U+0059 (Y)
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.db 0x7F, 0x63, 0x31, 0x18, 0x4C, 0x66, 0x7F, 0x00, // U+005A (Z)
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.db 0x1E, 0x06, 0x06, 0x06, 0x06, 0x06, 0x1E, 0x00, // U+005B ([)
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.db 0x03, 0x06, 0x0C, 0x18, 0x30, 0x60, 0x40, 0x00, // U+005C (\)
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.db 0x1E, 0x18, 0x18, 0x18, 0x18, 0x18, 0x1E, 0x00, // U+005D (])
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.db 0x08, 0x1C, 0x36, 0x63, 0x00, 0x00, 0x00, 0x00, // U+005E (^)
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.db 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xFF, // U+005F (_)
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.db 0x0C, 0x0C, 0x18, 0x00, 0x00, 0x00, 0x00, 0x00, // U+0060 (`)
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.db 0x00, 0x00, 0x1E, 0x30, 0x3E, 0x33, 0x6E, 0x00, // U+0061 (a)
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.db 0x07, 0x06, 0x06, 0x3E, 0x66, 0x66, 0x3B, 0x00, // U+0062 (b)
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.db 0x00, 0x00, 0x1E, 0x33, 0x03, 0x33, 0x1E, 0x00, // U+0063 (c)
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.db 0x38, 0x30, 0x30, 0x3e, 0x33, 0x33, 0x6E, 0x00, // U+0064 (d)
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.db 0x00, 0x00, 0x1E, 0x33, 0x3f, 0x03, 0x1E, 0x00, // U+0065 (e)
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.db 0x1C, 0x36, 0x06, 0x0f, 0x06, 0x06, 0x0F, 0x00, // U+0066 (f)
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.db 0x00, 0x00, 0x6E, 0x33, 0x33, 0x3E, 0x30, 0x1F, // U+0067 (g)
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.db 0x07, 0x06, 0x36, 0x6E, 0x66, 0x66, 0x67, 0x00, // U+0068 (h)
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.db 0x0C, 0x00, 0x0E, 0x0C, 0x0C, 0x0C, 0x1E, 0x00, // U+0069 (i)
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.db 0x30, 0x00, 0x30, 0x30, 0x30, 0x33, 0x33, 0x1E, // U+006A (j)
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.db 0x07, 0x06, 0x66, 0x36, 0x1E, 0x36, 0x67, 0x00, // U+006B (k)
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.db 0x0E, 0x0C, 0x0C, 0x0C, 0x0C, 0x0C, 0x1E, 0x00, // U+006C (l)
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.db 0x00, 0x00, 0x33, 0x7F, 0x7F, 0x6B, 0x63, 0x00, // U+006D (m)
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.db 0x00, 0x00, 0x1F, 0x33, 0x33, 0x33, 0x33, 0x00, // U+006E (n)
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.db 0x00, 0x00, 0x1E, 0x33, 0x33, 0x33, 0x1E, 0x00, // U+006F (o)
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.db 0x00, 0x00, 0x3B, 0x66, 0x66, 0x3E, 0x06, 0x0F, // U+0070 (p)
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.db 0x00, 0x00, 0x6E, 0x33, 0x33, 0x3E, 0x30, 0x78, // U+0071 (q)
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.db 0x00, 0x00, 0x3B, 0x6E, 0x66, 0x06, 0x0F, 0x00, // U+0072 (r)
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.db 0x00, 0x00, 0x3E, 0x03, 0x1E, 0x30, 0x1F, 0x00, // U+0073 (s)
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.db 0x08, 0x0C, 0x3E, 0x0C, 0x0C, 0x2C, 0x18, 0x00, // U+0074 (t)
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.db 0x00, 0x00, 0x33, 0x33, 0x33, 0x33, 0x6E, 0x00, // U+0075 (u)
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.db 0x00, 0x00, 0x33, 0x33, 0x33, 0x1E, 0x0C, 0x00, // U+0076 (v)
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.db 0x00, 0x00, 0x63, 0x6B, 0x7F, 0x7F, 0x36, 0x00, // U+0077 (w)
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.db 0x00, 0x00, 0x63, 0x36, 0x1C, 0x36, 0x63, 0x00, // U+0078 (x)
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.db 0x00, 0x00, 0x33, 0x33, 0x33, 0x3E, 0x30, 0x1F, // U+0079 (y)
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.db 0x00, 0x00, 0x3F, 0x19, 0x0C, 0x26, 0x3F, 0x00, // U+007A (z)
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.db 0x38, 0x0C, 0x0C, 0x07, 0x0C, 0x0C, 0x38, 0x00, // U+007B ({)
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.db 0x18, 0x18, 0x18, 0x00, 0x18, 0x18, 0x18, 0x00, // U+007C (|)
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.db 0x07, 0x0C, 0x0C, 0x38, 0x0C, 0x0C, 0x07, 0x00, // U+007D (})
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.db 0x6E, 0x3B, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, // U+007E (~)
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.db 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 // U+007F
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@ -23,7 +23,10 @@
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; reserved registers
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.def A = r0 ; accumulator
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.def STATUS = r25 ; signal status (see STATUS TABLE)
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.def POS_COARSE = Z ; coarse position (aligned to character column)
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.def POS_COARSE_H = r31
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.def POS_COARSE_L = r30
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.def POS_FINE = r24 ; fine position (bit inside coarse-position-pointed byte)
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; define constant
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.equ SYNC_PIN = PC0 ; Sync pin (pin 22)
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.equ DEBUG_PIN = PC1 ; DEBUG: Single vertical sync pulse to trigger oscilloscope (pin 23)
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