LED_multiple_panels - 9 tile screen working with one image space, platf…

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Ryan Savitski / Mbed 2 deprecated LED_multiple_panels

9 tile screen working with one image space, platform for development

frameout.s@0:8b26631e8c70, 2012-03-06 (annotated)

Committer:: rsavitski
Date:: Tue Mar 06 19:58:34 2012 +0000
Revision:: 0:8b26631e8c70

Who changed what in which revision?

User	Revision	Line number	New contents of line
rsavitski	0:8b26631e8c70	1	AREA framefunc, CODE, READONLY
rsavitski	0:8b26631e8c70	2	; Export my_asm function location so that C compiler can find it and link
rsavitski	0:8b26631e8c70	3	EXPORT frameout
rsavitski	0:8b26631e8c70	4	frameout
rsavitski	0:8b26631e8c70	5
rsavitski	0:8b26631e8c70	6	; r0 - dsVal array base address
rsavitski	0:8b26631e8c70	7	; r1 - data array base address
rsavitski	0:8b26631e8c70	8	; r2 - base address for port 0
rsavitski	0:8b26631e8c70	9	; r3 - loop counter
rsavitski	0:8b26631e8c70	10	; r4 - sclk bitmask
rsavitski	0:8b26631e8c70	11	; r5 - RGB channels bitmask
rsavitski	0:8b26631e8c70	12	; r6 - data reg 1
rsavitski	0:8b26631e8c70	13	; r7 - data reg 2
rsavitski	0:8b26631e8c70	14	; r8 - temporary value holding intensity info (used as an offset into dsVal array)
rsavitski	0:8b26631e8c70	15
rsavitski	0:8b26631e8c70	16
rsavitski	0:8b26631e8c70	17	; Save state
rsavitski	0:8b26631e8c70	18	PUSH {R4, R5, R6, R7, R8}
rsavitski	0:8b26631e8c70	19
rsavitski	0:8b26631e8c70	20	; Load GPIO Port 0 base address in register R6
rsavitski	0:8b26631e8c70	21	LDR R2, =0x2009C000 ; GPIO port 0 base address
rsavitski	0:8b26631e8c70	22
rsavitski	0:8b26631e8c70	23	; R3 - loop counter
rsavitski	0:8b26631e8c70	24	MOV R3, #256
rsavitski	0:8b26631e8c70	25
rsavitski	0:8b26631e8c70	26	; sclk mask
rsavitski	0:8b26631e8c70	27	MOV R4, #0x00010000 ; sclk bitmask
rsavitski	0:8b26631e8c70	28
rsavitski	0:8b26631e8c70	29	LOOP
rsavitski	0:8b26631e8c70	30
rsavitski	0:8b26631e8c70	31	;NOTE clocking swapped due to inverter used for logic levels
rsavitski	0:8b26631e8c70	32
rsavitski	0:8b26631e8c70	33	MOV R5, #0x03800000 ; bitmask for RGB bits
rsavitski	0:8b26631e8c70	34	STR R4, [R2, #0x1C] ; cleark clk to clock in data (negative edge)
rsavitski	0:8b26631e8c70	35
rsavitski	0:8b26631e8c70	36
rsavitski	0:8b26631e8c70	37	STR R5, [R2, #0x1C] ; clear RGB via FIOCLEAR
rsavitski	0:8b26631e8c70	38
rsavitski	0:8b26631e8c70	39	; R channel
rsavitski	0:8b26631e8c70	40	LDRB R8, [R1], #1 ; read data word (0-255 intensity) and post-increment array pointer to point to next word in data
rsavitski	0:8b26631e8c70	41	LDRB R6, [R0, R8] ; loading on/off state from dsVal, pointed to by offset equal to intensity of data
rsavitski	0:8b26631e8c70	42
rsavitski	0:8b26631e8c70	43
rsavitski	0:8b26631e8c70	44	; G channel
rsavitski	0:8b26631e8c70	45	LDRB R8, [R1], #1 ; read data word (0-255 intensity) into R8 and post-increment to point to next word in data
rsavitski	0:8b26631e8c70	46	LDRB R7, [R0, R8] ; loading on/off state from dsVal, pointed to by offset equal to intensity of data
rsavitski	0:8b26631e8c70	47
rsavitski	0:8b26631e8c70	48	AND R7, R7, #0x2 ; pick blue channel bit
rsavitski	0:8b26631e8c70	49
rsavitski	0:8b26631e8c70	50	ORR R6, R7, R6, lsr #7 ; store RG bits in R6 with clever stuff in R chan
rsavitski	0:8b26631e8c70	51
rsavitski	0:8b26631e8c70	52	; B channel
rsavitski	0:8b26631e8c70	53	LDRB R8, [R1], #1 ; read data word (0-255 intensity) into R8 and post-increment to point to next word in data
rsavitski	0:8b26631e8c70	54	LDRB R7, [R0, R8] ; loading on/off state from dsVal, pointed to by offset equal to intensity of data
rsavitski	0:8b26631e8c70	55
rsavitski	0:8b26631e8c70	56	AND R7, R7, #0x4 ; pick green channel bit
rsavitski	0:8b26631e8c70	57
rsavitski	0:8b26631e8c70	58	; writing to output
rsavitski	0:8b26631e8c70	59	ORR R6, R6, R7 ; RGB bits in R6
rsavitski	0:8b26631e8c70	60
rsavitski	0:8b26631e8c70	61	MOV R6, R6, lsl #23
rsavitski	0:8b26631e8c70	62
rsavitski	0:8b26631e8c70	63	STR R6, [R2,#0x18] ; FIOSET on/off for LED
rsavitski	0:8b26631e8c70	64
rsavitski	0:8b26631e8c70	65	;SUB R1, R1, #3
rsavitski	0:8b26631e8c70	66
rsavitski	0:8b26631e8c70	67	;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
rsavitski	0:8b26631e8c70	68
rsavitski	0:8b26631e8c70	69
rsavitski	0:8b26631e8c70	70	MOV R5, #0x00000380 ; bitmask for RGB bits
rsavitski	0:8b26631e8c70	71
rsavitski	0:8b26631e8c70	72	STR R5, [R2, #0x1C] ; clear RGB via FIOCLEAR
rsavitski	0:8b26631e8c70	73
rsavitski	0:8b26631e8c70	74	; R channel
rsavitski	0:8b26631e8c70	75	LDRB R8, [R1], #1 ; read data word (0-255 intensity) and post-increment array pointer to point to next word in data
rsavitski	0:8b26631e8c70	76	LDRB R6, [R0, R8] ; loading on/off state from dsVal, pointed to by offset equal to intensity of data
rsavitski	0:8b26631e8c70	77
rsavitski	0:8b26631e8c70	78
rsavitski	0:8b26631e8c70	79	; G channel
rsavitski	0:8b26631e8c70	80	LDRB R8, [R1], #1 ; read data word (0-255 intensity) into R8 and post-increment to point to next word in data
rsavitski	0:8b26631e8c70	81	LDRB R7, [R0, R8] ; loading on/off state from dsVal, pointed to by offset equal to intensity of data
rsavitski	0:8b26631e8c70	82
rsavitski	0:8b26631e8c70	83	AND R7, R7, #0x2 ; pick blue channel bit
rsavitski	0:8b26631e8c70	84
rsavitski	0:8b26631e8c70	85	ORR R6, R7, R6, lsr #7 ; store RG bits in R6 with clever stuff in R chan
rsavitski	0:8b26631e8c70	86
rsavitski	0:8b26631e8c70	87	; B channel
rsavitski	0:8b26631e8c70	88	LDRB R8, [R1], #1 ; read data word (0-255 intensity) into R8 and post-increment to point to next word in data
rsavitski	0:8b26631e8c70	89	LDRB R7, [R0, R8] ; loading on/off state from dsVal, pointed to by offset equal to intensity of data
rsavitski	0:8b26631e8c70	90
rsavitski	0:8b26631e8c70	91	AND R7, R7, #0x4 ; pick green channel bit
rsavitski	0:8b26631e8c70	92
rsavitski	0:8b26631e8c70	93	; writing to output
rsavitski	0:8b26631e8c70	94	ORR R6, R6, R7 ; RGB bits in R6
rsavitski	0:8b26631e8c70	95
rsavitski	0:8b26631e8c70	96	MOV R6, R6, lsl #7
rsavitski	0:8b26631e8c70	97
rsavitski	0:8b26631e8c70	98	STR R6, [R2,#0x18] ; FIOSET on/off for LED
rsavitski	0:8b26631e8c70	99
rsavitski	0:8b26631e8c70	100	;SUB R1, R1, #3
rsavitski	0:8b26631e8c70	101	;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
rsavitski	0:8b26631e8c70	102
rsavitski	0:8b26631e8c70	103
rsavitski	0:8b26631e8c70	104	MOV R5, #0x00068000 ; bitmask for RGB bits
rsavitski	0:8b26631e8c70	105
rsavitski	0:8b26631e8c70	106	STR R5, [R2, #0x1C] ; clear RGB via FIOCLEAR
rsavitski	0:8b26631e8c70	107
rsavitski	0:8b26631e8c70	108	; R channel
rsavitski	0:8b26631e8c70	109	LDRB R8, [R1], #1 ; read data word (0-255 intensity) and post-increment array pointer to point to next word in data
rsavitski	0:8b26631e8c70	110	LDRB R6, [R0, R8] ; loading on/off state from dsVal, pointed to by offset equal to intensity of data
rsavitski	0:8b26631e8c70	111
rsavitski	0:8b26631e8c70	112
rsavitski	0:8b26631e8c70	113	; G channel
rsavitski	0:8b26631e8c70	114	LDRB R8, [R1], #1 ; read data word (0-255 intensity) into R8 and post-increment to point to next word in data
rsavitski	0:8b26631e8c70	115	LDRB R7, [R0, R8] ; loading on/off state from dsVal, pointed to by offset equal to intensity of data
rsavitski	0:8b26631e8c70	116
rsavitski	0:8b26631e8c70	117	AND R7, R7, #0x4 ; pick blue channel bit
rsavitski	0:8b26631e8c70	118
rsavitski	0:8b26631e8c70	119	ORR R6, R7, R6, lsr #7 ; store RG bits in R6 with clever stuff in R chan
rsavitski	0:8b26631e8c70	120
rsavitski	0:8b26631e8c70	121	; B channel
rsavitski	0:8b26631e8c70	122	LDRB R8, [R1], #1 ; read data word (0-255 intensity) into R8 and post-increment to point to next word in data
rsavitski	0:8b26631e8c70	123	LDRB R7, [R0, R8] ; loading on/off state from dsVal, pointed to by offset equal to intensity of data
rsavitski	0:8b26631e8c70	124
rsavitski	0:8b26631e8c70	125	AND R7, R7, #0x8 ; pick green channel bit
rsavitski	0:8b26631e8c70	126
rsavitski	0:8b26631e8c70	127	; writing to output
rsavitski	0:8b26631e8c70	128	ORR R6, R6, R7 ; RGB bits in R6
rsavitski	0:8b26631e8c70	129
rsavitski	0:8b26631e8c70	130	MOV R6, R6, lsl #15
rsavitski	0:8b26631e8c70	131
rsavitski	0:8b26631e8c70	132	STR R6, [R2,#0x18] ; FIOSET on/off for LED
rsavitski	0:8b26631e8c70	133
rsavitski	0:8b26631e8c70	134	;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
rsavitski	0:8b26631e8c70	135
rsavitski	0:8b26631e8c70	136	SUBS R3, R3, #0x1 ; decrement loop counter
rsavitski	0:8b26631e8c70	137
rsavitski	0:8b26631e8c70	138	STR R4, [R2, #0x18] ; setting clock high
rsavitski	0:8b26631e8c70	139
rsavitski	0:8b26631e8c70	140
rsavitski	0:8b26631e8c70	141	BNE LOOP
rsavitski	0:8b26631e8c70	142
rsavitski	0:8b26631e8c70	143	POP {R4, R5, R6, R7, R8}
rsavitski	0:8b26631e8c70	144
rsavitski	0:8b26631e8c70	145	BX LR
rsavitski	0:8b26631e8c70	146	END

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Type:	Program
Mbed OS support:	Mbed 2 deprecated
Created:	06 Mar 2012
Imports:	2
Forks:	0
Commits:	1
Dependents:	0
Dependencies:	1
Followers:	1

frameout.s@0:8b26631e8c70, 2012-03-06 (annotated)

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