; CPU version 0.1
; GPU version 0.1 on IO port 1

nop
b _start

characters:
char_H_top: ; 0
.data 0b000000_100010_100010_111110
char_H_bottom:
.data 0b100010_100010_100010_000000
char_e_top: ; 1
.data 0b000000_000000_011000_100100
char_e_bottom:
.data 0b111100_100000_011100_000000
char_l_top: ; 2
.data 0b000000_100000_100000_100000
char_l_bottom:
.data 0b100000_100000_010000_000000
char_o_top: ; 3
.data 0b000000_000000_011000_100100
char_o_bottom:
.data 0b100100_100100_011000_000000
char_w_top: ; 4
.data 0b000000_000000_101010_101010
char_w_bottom:
.data 0b101010_101010_010100_000000
char_r_top: ; 5
.data 0b000000_000000_111000_100000
char_r_bottom:
.data 0b100000_100000_100000_000000
char_d_top: ; 6
.data 0b000100_011100_100100_100100
char_d_bottom:
.data 0b100100_100100_011100_000000

_start:

li x6, 1 ; x position
li x7, 1 ; y position

sw x0, 0b01_0100_000000(upper) ; gpu clear screen
sd x67, 0b01_0000_000000(upper) ; gpu move cursor

; H
lw x0, char_H_top(zero) ; upper 24 pixels
lw x1, char_H_bottom(zero) ; lower 24 pixels
sd x01, 0b01_0010_000000(upper) ; gpu print 6x8 char
addi x6, x6, 6 ; x position += 6
sd x67, 0b01_0000_000000(upper) ; gpu move cursor

; e
lw x0, char_e_top(zero)
lw x1, char_e_bottom(zero)
sd x01, 0b01_0010_000000(upper)
addi x6, x6, 6
sd x67, 0b01_0000_000000(upper) ; gpu move cursor

; l
lw x0, char_l_top(zero)
lw x1, char_l_bottom(zero)
sd x01, 0b01_0010_000000(upper)
addi x6, x6, 6
sd x67, 0b01_0000_000000(upper) ; gpu move cursor

; l
lw x0, char_l_top(zero)
lw x1, char_l_bottom(zero)
sd x01, 0b01_0010_000000(upper)
addi x6, x6, 6
sd x67, 0b01_0000_000000(upper) ; gpu move cursor

; o
lw x0, char_o_top(zero)
lw x1, char_o_bottom(zero)
sd x01, 0b01_0010_000000(upper)
addi x6, x6, 6
sd x67, 0b01_0000_000000(upper) ; gpu move cursor

; w
lw x0, char_w_top(zero)
lw x1, char_w_bottom(zero)
sd x01, 0b01_0010_000000(upper)
addi x6, x6, 6
sd x67, 0b01_0000_000000(upper) ; gpu move cursor

; o
lw x0, char_o_top(zero)
lw x1, char_o_bottom(zero)
sd x01, 0b01_0010_000000(upper)
addi x6, x6, 6
sd x67, 0b01_0000_000000(upper) ; gpu move cursor

; r
lw x0, char_r_top(zero)
lw x1, char_r_bottom(zero)
sd x01, 0b01_0010_000000(upper)
addi x6, x6, 6
sd x67, 0b01_0000_000000(upper) ; gpu move cursor

; l
lw x0, char_l_top(zero)
lw x1, char_l_bottom(zero)
sd x01, 0b01_0010_000000(upper)
addi x6, x6, 6
sd x67, 0b01_0000_000000(upper) ; gpu move cursor

; d
lw x0, char_d_top(zero)
lw x1, char_d_bottom(zero)
sd x01, 0b01_0010_000000(upper)
nop
nop
nop ; wait for print to finish
sd x01, 0b01_0011_000000(upper) ; gpu flush buffer to screen

wfi