Created
February 2, 2014 05:56
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assembly program for the vexpress-a9 to fill the screen with a color
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| .arch armv7-a | |
| .fpu neon | |
| .syntax unified | |
| .global _start | |
| _start: | |
| mov r1, $0 | |
| movt r1, $0x1002 //Primecell pl111 clcd is mapped to 0x10020000 | |
| //setup primecell registers | |
| movw r3, $0x3F9C | |
| movt r3, $0x3F1F //0x3F1F3F9C | |
| str r3, [r1, $0x0] //CLCD_TIM0 | |
| movw r3, $0x61DF | |
| movt r3, $0x090B //0x090B61DF | |
| str r3, [r1, $0x4] //CLCD_TIM1 | |
| mov r3, $0x1800 | |
| movt r3, $0x067F //0x067F1800 | |
| str r3, [r1, $0x8] //CLCD_TIM2 | |
| mov r2, $0 | |
| movt r2, $0x6002 //0x60020000 | |
| str r2, [r1, $0x10] //CLCD_UBAS | |
| movw r3, $0x082B //CNTL_LCDEN | CNTL_LCDBPP24 | CNTL_LCDTFT | CNTL_LCDPWR | |
| str r3, [r1, $0x18] //CLCD_PL111_CNTL | |
| //testcode | |
| mov r0, $0 | |
| mov r3, $0x12c000 //640 x 480 x 4 | |
| color: | |
| mov r1, r0 | |
| movw r4, $0xcc33 //99cc33 bgr in register, but is 33cc99 rgb color | |
| movt r4, $0x99 | |
| str r4, [r2, r0] | |
| add r0, r0, $4 | |
| cmp r0, r3 //we have drawn all pixles on the screen | |
| bne color | |
| hcf: B hcf //loop |
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