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;;; button - serial input dripver for CTP
;;;
;;; Copyright (c) 2009 Openmoko Inc.
;;;
;;; Authors Christopher Hall <hsw@openmoko.com>
;;;
;;; Redistribution and use in source and binary forms, with or without
;;; modification, are permitted provided that the following conditions are
;;; met:
;;;
;;; 1. Redistributions of source code must retain the above copyright
;;; notice, this list of conditions and the following disclaimer.
;;;
;;; 2. Redistributions in binary form must reproduce the above copyright
;;; notice, this list of conditions and the following disclaimer in
;;; the documentation and/or other materials provided with the
;;; distribution.
;;;
;;; THIS SOFTWARE IS PROVIDED BY THE CONTRIBUTORS ``AS IS'' AND ANY
;;; EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
;;; IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
;;; PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE CONTRIBUTORS BE LIABLE
;;; FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
;;; CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
;;; SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
;;; BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
;;; WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE
;;; OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN
;;; IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
.include "regs.inc"
;;; register usage
;;; r0 .. r3 must be preserved
;;; r4 result low
;;; r5 result high
;;; r6 .. r9 arguments 1..4
;;; r10 ..r14 reserved
;;; r15 __dp value
.section .bss
;;; buffer size = 2^n is conveient for modulo operation
BufferSize = 256
;;; buffer is full if: (write + 1) mod size == read
;;; buffer is full if: write == read
RxBuffer:
.space BufferSize
RxRead:
.long 0
RxWrite:
.long 0
ButtonMask = 0x07 ; only 3 bits used
PowerButton = 0x10 ; above ButtonMask
.section .text
;;; see if input is available
;;; input:
;;; output:
;;; r4 = 0 => not ready
;;; 1 => ready
;;; r5 = offset of byte to read
;;; r6 = address of RxRead
;;; temporary:
.global Button_available
Button_available:
xld.w %r6, RxRead
xld.w %r4, RxWrite
ld.w %r5, [%r6] ; read
ld.w %r4, [%r4] ; write
cmp %r5, %r4 ; read == write ?
jreq Button_available_buffer_empty
ld.w %r4, 1 ; TRUE => buffer is not empty
ret
Button_available_buffer_empty:
ld.w %r4, 0 ; FALSE => buffer is empty
ret
;;; read a button
;;; input:
;;; output:
;;; r4 = button
.global Button_get
Button_get_wait:
xcall suspend ; suspend until more input
Button_get:
call Button_available
or %r4, %r4
jreq Button_get_wait
ld.w %r7, %r5
xld.w %r4, RxBuffer
add %r5, %r4
xadd %r7, 1
xand %r7, (BufferSize - 1)
ld.ub %r4, [%r5]+ ; value
ld.w [%r6], %r7 ; update RxRead
ret
;;; poll the buttons
;;; input:
;;; output:
;;; r4 = button
.global Button_poll
Button_poll:
xld.w %r4, R8_P6_P6D ; address of buttond port
ld.ub %r4, [%r4] ; read buttond
xand %r4, ButtonMask ; mask unused bits
ret
;;; flush the buffer
;;; input:
;;; output:
.global Button_flush
Button_flush:
xld.w %r4, RxRead
xld.w %r5, RxWrite
ld.w %r6, 0
DISABLE_INTERRUPTS
ld.w [%r4], %r6
ld.w [%r5], %r6
ENABLE_INTERRUPTS
ret
;;; initialisation
;;; input:
;;; output:
.global Button_initialise
Button_initialise:
xld.w %r6, Vector_Key_input_interrupt_0
xld.w %r7, Button_RxInterrupt
xcall Vector_set
xld.w %r6, Vector_Key_input_interrupt_1
xld.w %r7, Button_RxInterrupt
xcall Vector_set
xld.w %r6, Vector_Port_input_interrupt_3
xld.w %r7, Button_P0Interrupt
xcall Vector_set
ld.w %r5, 0
xld.w %r4, RxRead
ld.w [%r4], %r5
xld.w %r4, RxWrite
ld.w [%r4], %r5
DISABLE_INTERRUPTS
xld.w %r4, R8_INT_PK01L ; key priority
xld.w %r5, 0x66
ld.b [%r4], %r5
xld.w %r4, R8_INT_FK01_FP03 ; clear key interrupts
xld.w %r5, FK1 | FK0 | FP3 | FP2 | FP1 | FP0
ld.b [%r4], %r5
xld.w %r4, R8_KINTCOMP_SCPK0 ; comparison = all buttons off
xld.w %r5, 0x00
ld.b [%r4], %r5
xld.w %r4, R8_KINTCOMP_SMPK0 ; enable 3 buttons
xld.w %r5, 0x07
ld.b [%r4], %r5
xld.w %r4, R8_KINTSEL_SPPK01 ; use P60..P62
xld.w %r5, 0x04
ld.b [%r4], %r5
xld.w %r4, R8_INT_PP01L ; P0 prority
xld.w %r5, 0x06
ld.b [%r4], %r5
xld.w %r4, R8_PINTSEL_SPT03 ; select P03 interrupt
xld.w %r5, 0x00
ld.b [%r4], %r5
xld.w %r4, R8_PINTPOL_SPP07 ; P03 active high
xld.w %r5, SPPT3
ld.b [%r4], %r5
xld.w %r4, R8_PINTEL_SEPT07 ; P03 edge trigered
xld.w %r5, SEPT3
ld.b [%r4], %r5
xld.w %r4, R8_INT_EK01_EP03 ; enable KINT0 and Port0
xld.w %r5, EK0 | EP3
ld.b [%r4], %r5
ENABLE_INTERRUPTS
ret
;;; receive new button value
;;; input:
;;; output:
.global Button_RxInterrupt
Button_RxInterrupt:
pushn %r14
xld.w %r4, R8_INT_FK01_FP03
xld.w %r5, FK1 | FK0
ld.b [%r4], %r5
xld.w %r0, R8_P6_P6D
xld.w %r1, R8_KINTCOMP_SCPK0
xld.w %r2, RxRead
xld.w %r3, RxWrite
ld.ub %r10, [%r0] ; button
xand %r10, ButtonMask ; mask unused bits
ld.b [%r1], %r10 ; update change of state
ld.w %r9, [%r3] ; RxWrite
xld.w %r11, RxBuffer ; buffer start
add %r11, %r9 ; + offset
ld.b [%r11]+, %r10 ; store button
ld.w %r11, [%r2] ; RxRead
xadd %r9, 1 ; next position
xand %r9, (BufferSize - 1) ; mod buffer size
cmp %r11, %r9 ; read == write?
jreq Button_RxInterrupt_buffer_full ; ...yes => buffer overrun, value lost
ld.w [%r3], %r9 ; update RxWrite
Button_RxInterrupt_buffer_full:
popn %r14
reti
;;; receive power button short pulse
;;; input:
;;; output:
.global Button_P0Interrupt
Button_P0Interrupt:
pushn %r14
xld.w %r4, R8_INT_FK01_FP03
xld.w %r5, FP3
ld.b [%r4], %r5
xld.w %r2, RxRead
xld.w %r3, RxWrite
xld.w %r10, PowerButton
ld.w %r9, [%r3] ; RxWrite
xld.w %r11, RxBuffer ; buffer start
add %r11, %r9 ; + offset
ld.b [%r11]+, %r10 ; store button
ld.w %r11, [%r2] ; RxRead
xadd %r9, 1 ; next position
xand %r9, (BufferSize - 1) ; mod buffer size
cmp %r11, %r9 ; read == write?
jreq Button_P0Interrupt_buffer_full ; ...yes => buffer overrun, value lost
ld.w [%r3], %r9 ; update RxWrite
Button_P0Interrupt_buffer_full:
popn %r14
reti
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