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/**
* @file svc.c
* An unused handler for SVC calls
* TODO: use SVC calls, possibly allowing for switch to unprivileged mode?
*
* Copyright (C) 2018 Clyne Sullivan
*
* 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 <gpio.h>
#include <clock.h>
//#include <lcd.h>
void SVC_Handler(void) {
uint32_t *stack;
uint8_t index;
asm("\
mrs r0, psp; \
mov %0, r0; \
ldr r0, [r0, #24]; \
ldr %1, [r0, #-2]; \
" : "=r" (stack), "=r" (index));
gpio_mode(GPIOA, 6, OUTPUT);
switch (index) {
case 1:
gpio_dout(GPIOA, 6, 1);
for (int i = 0; i < 100000; i++)
asm("");
gpio_dout(GPIOA, 6, 0);
break;
case 2:
// lcd_put((char *)stack[0]);
break;
default:
break;
}
}
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