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p1Kernel.asm
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p1Kernel.asm
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;;
; Copyright Jacques Deschênes 2023,24
; This file is part of pomme-1
;
; pomme-1 is free software: you can redistribute it and/or modify
; it under the terms of the GNU General Public License as published by
; the Free Software Foundation, either version 3 of the License, or
; (at your option) any later version.
;
; pomme-1 is distributed in the hope that it will be useful,
; but WITHOUT ANY WARRANTY; without even the implied warranty of
; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
; GNU General Public License for more details.
;
; You should have received a copy of the GNU General Public License
; along with pomme-1. If not, see <http://www.gnu.org/licenses/>.
;;
.module KERNEL
; .include "config.inc"
.include "inc/p1Kernel.inc"
;-----------------------
; a little kernel
; to access TERMIOS
; functions using
; STM8 TRAP instruction
;------------------------
;;-------------------------------
.area CODE
;;--------------------------------
;-------------------------
; software interrupt handler
;-------------------------
.macro _syscode n, t
cp a,#n
jrne t
.endm
TrapHandler::
ldw x,(8,sp)
_strxz trap_ret
ldw x,#syscall_handler
ldw (8,sp),x
iret
;------------------------
; kernel services
; switch
;------------------------
syscall_handler:
_syscode SYS_RST, 0$
_swreset
0$:
_syscode SYS_TICKS,1$
_ldxz ticks
jp syscall_exit
1$:
_syscode PUTC, 2$
ld a,xl
call uart_putc
jp syscall_exit
2$:
_syscode GETC,3$
call uart_getc
jp syscall_exit
3$:
_syscode QCHAR,4$
call qgetc
jra syscall_exit
4$:
_syscode CLR_SCR,5$
call clr_screen
jra syscall_exit
5$:
_syscode DELBK,6$
call bksp
jra syscall_exit
6$:
_syscode GETLN , 7$
ld a,xl
call readln
jra syscall_exit
7$:
_syscode PRT_STR , 8$
call puts
jra syscall_exit
8$:
_syscode PRT_INT , 9$
call print_int
jra syscall_exit
9$:
_syscode SET_TIMER , 10$
bres sys_flags,#FSYS_TIMER
_strxz timer
jra syscall_exit
10$:
_syscode CHK_TIMOUT, 11$
clr a
btjf sys_flags,#FSYS_TIMER,syscall_exit
cpl a
jra syscall_exit
11$:
_syscode TONE , 12$
call tone
jra syscall_exit
12$:
_syscode FILE_OP, 13$
call file_op
jra syscall_exit
13$:
_syscode GET_RND , 14$
call prng
jra syscall_exit
14$:
_syscode SEED_PRNG , 15$
call set_seed
jra syscall_exit
15$:
; bad codes ignored
syscall_exit: ; jump after trap instruction
jp [trap_ret]
;------------------------------
; TIMER 4 is used to maintain
; a milliseconds 'ticks' counter
; and decrement 'timer' varaiable
; and 'tone_ms' variable .
; these 3 variables are unsigned
; ticks range {0..65535}
; timer range {0..65535}
; tone_ms range {0..65535}
;--------------------------------
Timer4UpdateHandler:
clr TIM4_SR
_incz ticks+1
jrne 0$
_incz ticks
0$:
_ldxz timer
jreq 1$
decw x
_strxz timer
jrne 1$
bset sys_flags,#FSYS_TIMER
1$:
_ldxz tone_ms
jreq 2$
decw x
_strxz tone_ms
jrne 2$
bres sys_flags,#FSYS_TONE
2$:
_led_toggle
iret
;-----------------
; 1 Khz beep
;-----------------
beep_1khz::
pushw y
ldw x,#100
ldw y,#1000
call tone
popw y
ret
;---------------------
; input:
; Y frequency
; x duration
;---------------------
DIVR=1 ; divisor
VSIZE=2
.if HSI ; internal oscillator used
FR_TIM2=250000 ;16Mhz/64
.else
FR_TIM2=375000 ;24Mhz/64
.endif
tone::
_vars VSIZE
_strxz tone_ms
ldw (DIVR,sp),y ; divisor
; FR_TIM2/frequency
ldw y,#FR_TIM2>>16
ldw x,#FR_TIM2
ld a,#17
1$: subw y,(DIVR,sp)
ccf
jrc 2$
addw y,(DIVR,sp)
rcf
2$:
rlcw x
rlcw y
dec a
jrne 1$
ld a,xh
ld TIM2_ARRH,a
ld a,xl
ld TIM2_ARRL,a
; 50% duty cycle
srlw x
ld a,xh
ld TIM2_CCR1H,a
ld a,xl
ld TIM2_CCR1L,a
bset TIM2_CCER1,#TIM2_CCER1_CC1E
bset TIM2_CR1,#TIM2_CR1_CEN
bset TIM2_EGR,#TIM2_EGR_UG
bset sys_flags,#FSYS_TONE
6$: ; wait end of tone
wfi
btjt sys_flags,#FSYS_TONE ,6$
tone_off:
bres TIM2_CCER1,#TIM2_CCER1_CC1E
bres TIM2_CR1,#TIM2_CR1_CEN
_drop VSIZE
ret
;---------------------------------
; Pseudo Random Number Generator
; XORShift algorithm.
;---------------------------------
;---------------------------------
; seedx:seedy= x:y ^ seedx:seedy
; output:
; X:Y seedx:seedy new value
;---------------------------------
xor_seed32:
ld a,xh
_xorz seedx
_straz seedx
ld a,xl
_xorz seedx+1
_straz seedx+1
ld a,yh
_xorz seedy
_straz seedy
ld a,yl
_xorz seedy+1
_straz seedy+1
_ldxz seedx
_ldyz seedy
ret
;-----------------------------------
; x:y= x:y << a
; input:
; A shift count
; X:Y uint32 value
; output:
; X:Y uint32 shifted value
;-----------------------------------
sll_xy_32:
sllw y
rlcw x
dec a
jrne sll_xy_32
ret
;-----------------------------------
; x:y= x:y >> a
; input:
; A shift count
; X:Y uint32 value
; output:
; X:Y uint32 shifted value
;-----------------------------------
srl_xy_32:
srlw x
rrcw y
dec a
jrne srl_xy_32
ret
;-------------------------------------
; PRNG generator proper
; input:
; none
; ouput:
; X bits 31...16 PRNG seed
; use:
; seedx:seedy system variables
;--------------------------------------
prng::
pushw y
_ldxz seedx
_ldyz seedy
ld a,#13
call sll_xy_32
call xor_seed32
ld a,#17
call srl_xy_32
call xor_seed32
ld a,#5
call sll_xy_32
call xor_seed32
popw y
ret
;---------------------------------
; initialize seedx:seedy
; input:
; X 0 -> seedx=ticks, seedy=tib[0..1]
; X !0 -> seedx=X, seedy=0
;-------------------------------------------
set_seed::
tnzw x
jrne 1$
ldw x,ticks
_strxz seedx
ldw x,tib
_strxz seedy
ret
1$:
_strxz seedx
_clrz seedy
_clrz seedy+1
ret
;;;;;;;;;;;;;;;;;;;;;;;;;;
;;; EEPROM routines ;;;
;;;;;;;;;;;;;;;;;;;;;;;;;;
;---------------------------
; unlock eeprom programming
;---------------------------
eeprom_unlock:
btjt FLASH_IAPSR,#FLASH_IAPSR_DUL,3$
1$: mov FLASH_DUKR,#FLASH_DUKR_KEY1
mov FLASH_DUKR,#FLASH_DUKR_KEY2
2$: btjf FLASH_IAPSR,#FLASH_IAPSR_DUL,.
3$:
ret
;-------------------------------
; lock eeprom programming
;-------------------------------
eeprom_lock:
bres FLASH_IAPSR,#FLASH_IAPSR_DUL
ret
;-------------------------------
; write 1 byte to eeprom
; eeprom must be unlocked
; input:
; a value
; Y address
;--------------------------------
eeprom_write_byte::
btjf FLASH_IAPSR,#FLASH_IAPSR_DUL,9$
ld (y),a
btjf FLASH_IAPSR,#FLASH_IAPSR_EOP,.
9$:
ret
;----------------------------
; write uint8_t to EEPROM
; eeprom must be unlocked
; input:
; x value
; y address
;----------------------------
eeprom_write_2bytes::
btjf FLASH_IAPSR,#FLASH_IAPSR_DUL,9$
ld a,xh
ld (y),a
btjf FLASH_IAPSR,#FLASH_IAPSR_EOP,.
ld a,xl
ld (1,y),a
btjf FLASH_IAPSR,#FLASH_IAPSR_EOP,.
9$:
ret
;---------------------------------
; write uint32_t to EEPROM
; eeprom must be unlocked
; input:
; X *uint32_t
; y eeprom address
;---------------------------------
eeprom_write_4bytes::
btjf FLASH_IAPSR,#FLASH_IAPSR_DUL,9$
mov FLASH_CR2,#0X40
mov FLASH_CR2,#0XBF
push #4
4$:
ld a,(x)
ld (y),a
incw x
incw y
dec (1,sp)
jrne 4$
_drop 1
btjf FLASH_IAPSR,#FLASH_IAPSR_EOP,.
9$:
ret