diff options
| -rw-r--r-- | firmware/target/arm/samsung/yh920/lcd-as-yh920.S | 26 |
1 files changed, 15 insertions, 11 deletions
diff --git a/firmware/target/arm/samsung/yh920/lcd-as-yh920.S b/firmware/target/arm/samsung/yh920/lcd-as-yh920.S index 9444954..2c7f511 100644 --- a/firmware/target/arm/samsung/yh920/lcd-as-yh920.S +++ b/firmware/target/arm/samsung/yh920/lcd-as-yh920.S @@ -27,27 +27,31 @@ .align 2 +/* Writes an array of pixels of specified width (in 8 bits unit) + * + * Arguments: + * r0 : pixels array + * r1 : number of pixels in 8 bits unit + * + * Register usage: + * r2 : LCD_CONTROL value / pixel value + * r3 : lcd bridge address + */ + .global lcd_write_data .type lcd_write_data,%function lcd_write_data: - ldr r12, =LCD1_BASE + ldr r3, =LCD1_BASE .loop: - ldrb r2, [r0], #1 - 1: - ldr r3, [r12] - tst r3, #LCD1_BUSY_MASK + ldr r2, [r3] + tst r2, #LCD1_BUSY_MASK bne 1b - str r2, [r12, #0x10] ldrb r2, [r0], #1 -1: - ldr r3, [r12] - tst r3, #LCD1_BUSY_MASK - bne 1b - str r2, [r12, #0x10] + str r2, [r3, #0x10] subs r1, r1, #1 bne .loop |