7u83/stc_rpncalc
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added facility to debug the stack pointer on P3_4 (LCD LED cathode)

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roughly 139 bytes
functions were chosen by manually traversing pow_decn to the bottom
This commit is contained in:
Mirko Scholz 2020-09-08 23:46:41 +02:00
parent 7593260487
commit 4316f928f8
10 changed files with 167 additions and 16 deletions
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5
Makefile
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@ -4,8 +4,9 @@ SDCCOPTS ?= --code-size $(STCCODESIZE) --xram-size 256 --idata-loc 0x80
#SDCCOPTS ?= --code-size $(STCCODESIZE) --xram-size 256 --stack-auto --model-large
FLASHFILE ?= main.hex
LARGE_LDFLAGS += -L/usr/share/sdcc/lib/large/
# CFLAGS += -DSTACK_DEBUG # write the stack pointer to P3_4
SRC = src/lcd.c src/key.c src/utils.c src/decn/decn.c src/calc.c
SRC = src/lcd.c src/key.c src/utils.c src/decn/decn.c src/calc.c src/stack_debug.c
OBJ=$(patsubst src%.c,build%.rel, $(SRC))
@ -13,7 +14,7 @@ all: main
build/%.rel: src/%.c src/%.h
mkdir -p $(dir $@)
$(SDCC) $(SDCCOPTS) -o $@ -c $<
$(SDCC) $(SDCCOPTS) $(CFLAGS) -o $@ -c $<
main: $(OBJ)
$(SDCC) -o build/ src/$@.c $(SDCCOPTS) $(CFLAGS) $^

1
src/calc.c
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@ -21,6 +21,7 @@
#include "utils.h"
#include "calc.h"
#include "stack_debug.h"
__xdata dec80 StoredDecn;
__xdata dec80 LastX;

2
src/decn/CMakeLists.txt
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@ -12,7 +12,7 @@ target_compile_options(coverage_config INTERFACE -O0 -g --coverage)
target_link_libraries(coverage_config INTERFACE --coverage)
# decn library
add_library(decn decn.c)
add_library(decn decn.c ../utils.c)
# decn library with coverage
add_library(decn_cover decn.c)

4
src/decn/decn.c
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@ -19,6 +19,7 @@
*/
#include "../utils.h"
#include "../stack_debug.h"
#include "decn.h"
@ -86,6 +87,8 @@ const dec80 DECN_LN_10 = {
void copy_decn(dec80* const dest, const dec80* const src){
uint8_t i;
stack_debug(0x01);
dest->exponent = src->exponent;
//copy nibbles
@ -163,6 +166,7 @@ static void remove_leading_zeros(dec80* x){
uint8_t is_negative = (x->exponent < 0);
exp_t exponent = get_exponent(x);
stack_debug(0x02);
//find first non-zero digit100
for (digit100 = 0; digit100 < DEC80_NUM_LSU; digit100++){
if (x->lsu[digit100] != 0){

6
src/lcd.c
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@ -155,9 +155,15 @@ void LCD_Open(void) {
//P2 entire port
P2M1 = 0;
P2M0 = 0xff;
#ifdef STACK_DEBUG
// P3_4 is special
P3M1 &= ~(0xe0);
P3M0 |= (0xe0);
#else
//P3 pins 7:4
P3M1 &= ~(0xf0);
P3M0 |= (0xf0);
#endif
_delay_ms(30); // to allow LCD powerup
outCsrBlindNibble(0x03); // (DL=1 8-bit mode)

7
src/main.c
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@ -28,6 +28,7 @@
#else
#include "stc15.h"
#endif
#include "stack_debug.h"
#define FOSC 11583000
@ -225,7 +226,9 @@ int main()
LCD_Open();
KeyInit();
Timer0Init(); //for reading keyboard
BACKLIGHT_ON(); //turn on led backlight
backlight_on(); //turn on led backlight
stack_debug_init();
stack_debug(0xfe);
ExpBuf[0] = 0;
ExpBuf[1] = 0;
@ -529,7 +532,7 @@ int main()
LcdAvailable.release();
#endif
//turn backlight back on
BACKLIGHT_ON();
backlight_on();
} //while (1)
}
/* ------------------------------------------------------------------------- */

92
src/stack_debug.c Normal file
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@ -0,0 +1,92 @@
// This program 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.
//
// This program 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 this program. If not, see <https://www.gnu.org/licenses/>.
#include <stdint.h>
#include "stack_debug.h"
#if defined(STACK_DEBUG)
extern uint16_t _SP;
inline static void HIGH() {
P3_4 = 1;
}
inline static void LOW() {
P3_4 = 1;
}
void stack_debug_init() {
P3M1 &= ~(0x10);
P3M0 |= 0x10;
LOW();
stack_debug_write(0x55);
stack_debug_write(0xAA);
stack_debug_write(0x55);
stack_debug_write(0xAA);
stack_debug_write(0x80);
stack_debug_write(0x10);
stack_debug_write(0x08);
stack_debug_write(0x01);
}
/*
for frequency of 12.000 MHz (12.005 adjusted) this gives a rate of 1'190'000 Baud
negative polarity, MSB
*/
void stack_debug_write(uint8_t value) __naked {
value;
__asm
.macro HIGH
setb _P3_4
.endm
.macro LOW
clr _P3_4
.endm
mov dph,r0
mov a,dpl
mov r0,#8
; START
HIGH ; 1
nop ; 1
nop ; 1
nop ; 1
stack_debug_1$:
rlc a ; 1
jc stack_debug_2$ ; 3
HIGH ; 1
djnz r0,stack_debug_1$ ; 4
sjmp stack_debug_3$ ; 3
stack_debug_2$:
LOW ; 1
djnz r0,stack_debug_1$ ; 4
sjmp stack_debug_3$ ; 3
stack_debug_3$:
nop ; 1
; STOP
LOW ; 1
nop ; 1
nop ; 1
mov r0,dph ; 3
ret ; 4
__endasm;
}
void stack_debug(uint8_t marker) {
stack_debug_write(marker);
stack_debug_write(SP);
}
#endif // !defined(DESKTOP)

54
src/stack_debug.h Normal file
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@ -0,0 +1,54 @@
// This program 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.
//
// This program 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 this program. If not, see <https://www.gnu.org/licenses/>.
#ifndef SRC_STACK_DEBUG_H_
#define SRC_STACK_DEBUG_H_
#include <stdint.h>
#if !defined(DESKTOP)
#include "stc15.h"
#endif
#ifdef __cplusplus
extern "C" {
#endif
// P3_4 is connected to the cathode and the only pin that is not toggled normally
// unfortunately, the hardware uart cannot be mapped to TX = P3_4
#if defined(STACK_DEBUG)
void stack_debug_init(void);
void stack_debug(uint8_t marker);
void stack_debug_write(uint8_t value) __naked;
#else
#define stack_debug_init()
#define stack_debug(marker)
#endif
#if defined(DESKTOP) || defined(STACK_DEBUG)
#define backlight_on()
#define backlight_off()
#else
inline void backlight_on(void) {
P3_4 = 0;
}
inline void backlight_off(void) {
P3_4 = 1;
}
#endif
#ifdef __cplusplus
}
#endif
#endif

5
src/utils.c
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@ -29,7 +29,6 @@ void _delay_us(uint8_t us)
(void) us;
}
#endif
void backlight_off(void){ }
#else //!DESKTOP
void _delay_ms(uint8_t ms)
{
@ -69,10 +68,6 @@ void _delay_us(uint8_t us)
}
#endif
void backlight_off(void){
P3_4 = 1;
}
#endif //ifdef desktop
#ifdef DESKTOP

5
src/utils.h
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@ -35,9 +35,6 @@ void _delay_us(uint8_t us);
#define _delay_us(x) _delay_ms(1)
#endif
void backlight_off(void);
#ifdef __linux__
#define DESKTOP
@ -58,11 +55,9 @@ char* u32str(uint32_t x, char* buf, uint8_t base);
#define __at uint8_t*
#define SDCC_ISR(isr, reg)
#define __using(x)
#define BACKLIGHT_ON()
#define TURN_OFF()
#else
#define SDCC_ISR(isr, reg) __interrupt (isr) __using (reg)
#define BACKLIGHT_ON() P3_4 = 0
#define TURN_OFF() P3_2 = 0
#endif