restructuring

2026-02-28 03:44:30 +03:00 · 2022-03-10 11:04:14 +03:00
parent 29560b7c0c
commit 733dbd75d2
1758 changed files with 14 additions and 26855 deletions
--- a/F0:F030,F042,F072/blink/systick_blink.c
+++ b/F0:F030,F042,F072/blink/systick_blink.c
@@ -0,0 +1,87 @@
+/*
+ * systick_blink.c
+ *
+ * Copyright 2017 Edward V. Emelianoff <eddy@sao.ru, edward.emelianoff@gmail.com>
+ *
+ * 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 2 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, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
+ * MA 02110-1301, USA.
+ */
+
+#include "stm32f0.h"
+
+static volatile uint32_t blink_ctr = 0;
+
+/* Called when systick fires */
+void sys_tick_handler(void){
+    ++blink_ctr;
+}
+
+/*
+ * Set up timer to fire every x milliseconds
+ */
+static void systick_setup(uint32_t xms){
+    static uint32_t curms = 0;
+    if(curms == xms) return;
+    // 6MHz - HCLK/8 (due to HPRE=1 HCLK=SYSCLK)
+    // this function also clears counter so it starts right away
+    SysTick_Config(6000 * xms, 1);
+    curms = xms;
+}
+
+
+/* set STM32 to clock by 48MHz from HSI oscillator */
+//static void clock_setup(void){
+    //StartHSE(RCC_CR_CSSON | RCC_CR_HSEBYP);
+//}
+
+static void gpio_setup(void){
+    /* Enable clocks to the GPIO subsystems (A&B) */
+    RCC->AHBENR |= RCC_AHBENR_GPIOAEN | RCC_AHBENR_GPIOBEN;
+    /* Set green led (PB3) as output */
+    GPIOB->MODER = GPIO_MODER_MODER3_O;
+   // gpio_mode_setup(GPIOB, GPIO_MODE_OUTPUT, GPIO_PUPD_NONE, GPIO3);
+    /* D2 - PA12 - switch blink rate (pullup input) */
+    GPIOA->PUPDR = GPIO_PUPDR_PUPDR12_0;
+    //gpio_mode_setup(GPIOA, GPIO_MODE_INPUT, GPIO_PUPD_PULLUP, GPIO12);
+}
+
+static const uint32_t L[] = {125,100,125,100,125,200, 350,100,350,100,350,200, 125,100,125,100,125, 1000};
+
+int main(void){
+    sysreset();
+    // set divider by 8
+    SysTick->CTRL &= ~SysTick_CTRL_CLKSOURCE_Msk;
+    //StartHSE();
+    //StartHSI48();
+  //  clock_setup();
+    gpio_setup();
+
+    /* 500ms ticks =>  1000ms period => 1Hz blinks */
+    systick_setup(100);
+    /* Do nothing in main loop */
+    while (1){
+        if(pin_read(GPIOA, 1<<12)){
+            uint32_t T = blink_ctr % 18;
+            systick_setup(L[T]);
+            if(T & 1) pin_clear(GPIOB, 1<<3);
+            else pin_set(GPIOB, 1<<3);
+        }else{
+            systick_setup(2000);
+            if(blink_ctr & 1) pin_clear(GPIOB, 1<<3);
+            else pin_set(GPIOB, 1<<3);
+
+        }
+    }
+}