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Implemented pin_get

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T-moe
2016-01-31 19:35:03 +01:00
parent fb6a5ba3bc
commit 36b136074e
1 changed files with 21 additions and 2 deletions
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21
src/io.s
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@@ -31,6 +31,14 @@ pin_t2: .word 0 //storage for GPIO ptr
pin_t3: .word 0 //storage for GPIO ptr pin_t3: .word 0 //storage for GPIO ptr
.hword 0 .hword 0
/*
static uint8_t new = 0;
static uint8_t old = 0;
static volatile uint8_t edg = 0;
*/
new: .byte 0
old: .byte 0
edg: .byte 0
@@ -104,8 +112,19 @@ end_pin_create:
//R0: address to pin struct. Return value in R0 (1 byte) //R0: address to pin struct. Return value in R0 (1 byte)
pin_get: pin_get:
//TODO: Implement .set GPIO_IDR, 0x10
//return ((pin->GPIO->IDR & pin->pinmask) > 0);
LDR r1, [r0, #OFFSET_PIN_GPIO] //r1 = pin->GPIO
LDR r1, [r1,#GPIO_IDR] // r1 = pin->GPIO->IDR
LDRH r2, [r0, #OFFSET_PIN_PINMASK] // r2 = pin->pinmask
TST r1, r2 // flags = r1 & r2
BEQ pin_get_1 //jump to pin_get_1 if r1 & r2 > 0
MOV r0, #0 //return 0
MOV pc, lr
pin_get_1:
MOV r0, #1 //return 1
MOV pc, lr
end_pin_get: end_pin_get: