added blink for STM32G0B1, next -> add USART

2026-03-22 01:31:21 +03:00 · 2026-03-01 23:11:22 +03:00
parent 061fd8bec8
commit 1f4f111c52
18 changed files with 454 additions and 88 deletions
--- a/G0:G070/g0b1/main.c
+++ b/G0:G070/g0b1/main.c
@@ -0,0 +1,86 @@
+/*
+ * This file is part of the blink project.
+ * Copyright 2023 Edward V. Emelianov <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 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 "stm32g0.h"
+
+#define KEY_PORT        GPIOC
+#define KEY_PIN         (1<<13)
+#define LED_PORT        GPIOC
+#define LED_PIN         (1<<6)
+#define KEY_PRESSED()   (pin_read(KEY_PORT, KEY_PIN) == 1)
+#define LED_ON()        do{pin_set(LED_PORT, LED_PIN);}while(0)
+#define LED_OFF()       do{pin_clear(LED_PORT, LED_PIN);}while(0)
+
+// KEY (intpullup->0) - PC13
+// LED - PC6
+
+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){ // xms < 2098!!!
+    blink_ctr = 0;
+    static uint32_t curms = 0;
+    if(curms == xms) return;
+    // 8MHz - HCLK/8
+    // this function also clears counter so it starts right away
+    SysTick_Config(8000 * xms); // arg should be < 0xffffff, so ms should be < 2098
+    curms = xms;
+}
+
+static void gpio_setup(void){
+    RCC->IOPENR = RCC_IOPENR_GPIOCEN; // enable PC
+    // set PC8 as opendrain output, PC0 is pullup input, other as default (AIN)
+    GPIOC->MODER = (0xffffffff & ~(GPIO_MODER_MODE6 | GPIO_MODER_MODE13)) | GPIO_MODER_MODER6_O; // GPIO_MODER_MODER13_I == 0
+    GPIOC->PUPDR = GPIO_PUPDR13_PD; // pull down
+}
+
+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){
+    StartHSE();
+    gpio_setup();
+    systick_setup(500);
+    uint32_t M = 0;
+    int pressed = 0;
+    /* Do nothing in main loop */
+    while (1){
+        if(KEY_PRESSED()){ // key pressed - 'sos'
+            pressed = 1;
+            systick_setup(L[M]);
+            if(M & 1) LED_OFF();
+            else LED_ON();
+            if(++M == 18) M = 0;
+            while(blink_ctr == 0);
+        }else{ // key not pressed - blink with period of 1s
+            if(pressed){
+                M = 0;
+                pressed = 0;
+                systick_setup(500);
+            }
+            if(blink_ctr & 1) LED_ON();
+            else LED_OFF();
+        }
+    }
+}