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/* Megumin LED display firmware
* Copyright (C) 2018 Sebastian Götte <code@jaseg.net>
*
* 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 <http://www.gnu.org/licenses/>.
*/
#include "global.h"
#include "i2c.h"
#include "mpu6050.h"
uint32_t pcg32_random_r() {
// *Really* minimal PCG32 code / (c) 2014 M.E. O'Neill / pcg-random.org
// Licensed under Apache License 2.0 (NO WARRANTY, etc. see website)
static uint64_t state = 0xbc422715d3aef60f;
static uint64_t inc = 0x6605e3bc6d1a869b;
uint64_t oldstate = state;
// Advance internal state
state = oldstate * 6364136223846793005ULL + (inc|1);
// Calculate output function (XSH RR), uses old state for max ILP
uint32_t xorshifted = ((oldstate >> 18u) ^ oldstate) >> 27u;
uint32_t rot = oldstate >> 59u;
return (xorshifted >> rot) | (xorshifted << ((-rot) & 31));
}
unsigned char dumb_random() {
static unsigned char x=0x66, a=0x05, b=0xe3, c=0xbc;
x++; //x is incremented every round and is not affected by any other variable
a = (a ^ c ^ x); //note the mix of addition and XOR
b = (b + a); //And the use of very few instructions
c = ((c + (b >> 1) ^ a)); // the AES S-Box Operation ensures an even distributon of entropy
return (c);
}
int main(void) {
/* We're starting out from HSI@8MHz */
SystemCoreClockUpdate();
/* Turn on lots of neat things */
RCC->AHBENR |= RCC_AHBENR_GPIOAEN | RCC_AHBENR_GPIOBEN;
GPIOA->MODER |=
(1<<GPIO_MODER_MODER1_Pos)| /* PA1 - Port 1 */
(1<<GPIO_MODER_MODER2_Pos)| /* PA2 - Port 2 */
(1<<GPIO_MODER_MODER3_Pos)| /* PA3 - Port 3 */
(1<<GPIO_MODER_MODER4_Pos)| /* PA4 - Port 4 */
(1<<GPIO_MODER_MODER9_Pos); /* PA9 - LED */
int idx = 1;
while (1) {
GPIOA->ODR ^= (1<<9);
GPIOA->ODR = 2<<idx;
idx += 1;
if (idx > 4)
idx = 1;
for (size_t j=0; j<1000000; j++) {
asm volatile ("nop");
}
}
}
void gdb_dump(void) {
/* debugger hook */
}
void NMI_Handler(void) {
asm volatile ("bkpt");
}
void HardFault_Handler(void) __attribute__((naked));
void HardFault_Handler() {
asm volatile ("bkpt");
}
void SVC_Handler(void) {
asm volatile ("bkpt");
}
void PendSV_Handler(void) {
asm volatile ("bkpt");
}
void SysTick_Handler(void) {
asm volatile ("bkpt");
}
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