From 226fef1618dd9a37c050bb79a24c77396cd14c46 Mon Sep 17 00:00:00 2001
From: jaseg <git@jaseg.net>
Date: Sun, 11 Oct 2020 23:31:12 +0200
Subject: Initial fw commit

---
 fw/main.c | 97 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 97 insertions(+)
 create mode 100644 fw/main.c

(limited to 'fw/main.c')

diff --git a/fw/main.c b/fw/main.c
new file mode 100644
index 0000000..360728e
--- /dev/null
+++ b/fw/main.c
@@ -0,0 +1,97 @@
+/* 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");
+}
+
-- 
cgit