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/*
* The MIT License (MIT)
*
* Copyright (c) 2016 Matthias P. Braendli
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in all
* copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*/
#include "common.h"
#include "usart.h"
#include "FreeRTOS.h"
#include "timers.h"
#include "gps.h"
#include <stm32f4xx.h>
#include <time.h>
static uint64_t common_timestamp = 0; // milliseconds since startup
static TimerHandle_t common_timer;
// The LFSR is used as random number generator
static const uint16_t lfsr_start_state = 0x12ABu;
static uint16_t lfsr;
static void common_increase_timestamp(TimerHandle_t t);
int find_last_sunday(const struct tm* time)
{
struct tm t = *time;
// the last sunday can never be before the 20th
t.tm_mday = 20;
int last_sunday = 1;
while (t.tm_mon == time->tm_mon) {
t.tm_mday++;
if (mktime(&t) == (time_t)-1) {
// TODO error
return -1;
}
const int sunday = 0;
if (t.tm_wday == sunday) {
last_sunday = t.tm_mday;
}
}
return last_sunday;
}
/* Calculate if we are in daylight saving time.
* return 0 if false
* 1 if true
* -1 in case of error
*/
static int is_dst(const struct tm *time)
{
/* DST from 01:00 UTC on last Sunday in March
* to 01:00 UTC on last Sunday in October
*/
const int march = 2;
const int october = 9;
if (time->tm_mon < march) {
return 0;
}
else if (time->tm_mon == march) {
int last_sunday = find_last_sunday(time);
if (last_sunday == -1) return -1;
if (time->tm_mday < last_sunday) {
return 0;
}
else if (time->tm_mday == last_sunday) {
return (time->tm_hour < 1) ? 0 : 1;
}
else {
return 1;
}
}
else if (time->tm_mon > march && time->tm_mon < october) {
return 1;
}
else if (time->tm_mon == october) {
int last_sunday = find_last_sunday(time);
if (last_sunday == -1) return -1;
if (time->tm_mday < last_sunday) {
return 1;
}
else if (time->tm_mday == last_sunday) {
return (time->tm_hour < 1) ? 1 : 0;
}
else {
return 0;
}
}
else {
return 0;
}
}
int local_time(struct tm *time)
{
const int local_time_offset=1; // hours
int valid = gps_utctime(time);
if (valid) {
time->tm_hour += local_time_offset;
if (is_dst(time)) {
time->tm_hour++;
time->tm_isdst = 1;
}
// Let mktime fix the struct tm *time
if (mktime(time) == (time_t)-1) {
// TODO inform about failure
valid = 0;
}
}
return valid;
}
void common_init(void)
{
common_timer = xTimerCreate("Timer",
portTICK_PERIOD_MS,
pdTRUE, // Auto-reload
NULL, // No unique id
common_increase_timestamp
);
xTimerStart(common_timer, 0);
lfsr = lfsr_start_state;
}
static void common_increase_timestamp(TimerHandle_t t)
{
common_timestamp++;
}
uint64_t timestamp_now(void)
{
return common_timestamp;
}
// Return either 0 or 1, somewhat randomly
int random_bool(void)
{
uint16_t bit;
/* taps: 16 14 13 11; feedback polynomial: x^16 + x^14 + x^13 + x^11 + 1 */
bit = ((lfsr >> 0) ^ (lfsr >> 2) ^ (lfsr >> 3) ^ (lfsr >> 5) ) & 1;
lfsr = (lfsr >> 1) | (bit << 15);
return bit;
}
// For the debugger
static int faultsource = 0;
void trigger_fault(int source)
{
usart_debug("Fatal: %d", source);
__disable_irq();
faultsource = source;
while (1) {}
}
void hard_fault_handler_c(uint32_t *hardfault_args)
{
uint32_t stacked_r0;
uint32_t stacked_r1;
uint32_t stacked_r2;
uint32_t stacked_r3;
uint32_t stacked_r12;
uint32_t stacked_lr;
uint32_t stacked_pc;
uint32_t stacked_psr;
stacked_r0 = hardfault_args[0];
stacked_r1 = hardfault_args[1];
stacked_r2 = hardfault_args[2];
stacked_r3 = hardfault_args[3];
stacked_r12 = hardfault_args[4];
stacked_lr = hardfault_args[5];
stacked_pc = hardfault_args[6];
stacked_psr = hardfault_args[7];
usart_debug_puts("\n\n[Hard fault handler - all numbers in hex]\n");
usart_debug("R0 = %x\n", stacked_r0);
usart_debug("R1 = %x\n", stacked_r1);
usart_debug("R2 = %x\n", stacked_r2);
usart_debug("R3 = %x\n", stacked_r3);
usart_debug("R12 = %x\n", stacked_r12);
usart_debug("LR [R14] = %x subroutine call return address\n", stacked_lr);
usart_debug("PC [R15] = %x program counter\n", stacked_pc);
usart_debug("PSR = %x\n", stacked_psr);
usart_debug("BFAR = %x\n", (*((volatile unsigned long *)(0xE000ED38))));
usart_debug("CFSR = %x\n", (*((volatile unsigned long *)(0xE000ED28))));
usart_debug("HFSR = %x\n", (*((volatile unsigned long *)(0xE000ED2C))));
usart_debug("DFSR = %x\n", (*((volatile unsigned long *)(0xE000ED30))));
usart_debug("AFSR = %x\n", (*((volatile unsigned long *)(0xE000ED3C))));
usart_debug("SCB_SHCSR = %x\n", SCB->SHCSR);
while (1);
}
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