restructuring

2026-02-28 11:54:30 +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/uart_blink_dma/main.c
+++ b/F0:F030,F042,F072/uart_blink_dma/main.c
@@ -0,0 +1,91 @@
+/*
+ * main.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"
+#include "usart.h"
+
+volatile uint32_t Tms = 0;
+
+/* Called when systick fires */
+void sys_tick_handler(void){
+    ++Tms;
+}
+
+static void gpio_setup(void){
+    /* Enable clocks to the GPIO subsystems (A&B) */
+    RCC->AHBENR |= RCC_AHBENR_GPIOAEN;
+    /* Set green leds (PA5 & PA5) as output */
+    GPIOA->MODER = GPIO_MODER_MODER4_O | GPIO_MODER_MODER5_O;
+    GPIOA->OTYPER = 1 << 5; // PA5 - opendrain, PA4 - pushpull
+    /* PA6 - switch blink rate (pullup input) */
+    GPIOA->PUPDR = GPIO_PUPDR_PUPDR6_0;
+}
+
+/**
+ * reverce line
+ */
+char *rline(char *in, int L){
+    static char out[UARTBUFSZ];
+    if(L > UARTBUFSZ - 1) return in;
+    char *optr = out, *iptr = &in[L-1];
+    for(; L > 0; --L) *optr++ = *iptr--;
+    *optr = '\n';
+    return out;
+}
+
+int main(void){
+    uint32_t lastT = 0;
+    int L = 0, dummyctr = 0;
+    uint32_t ostctr = 0;
+    char *txt;
+    sysreset();
+    SysTick_Config(6000, 1);
+    gpio_setup();
+    USART1_config();
+    //StartHSE();
+    pin_set(GPIOA, 1<<5); // clear extern LED
+    /* Do nothing in main loop */
+    while (1){
+        if(lastT > Tms || Tms - lastT > 499){
+            pin_toggle(GPIOA, 1<<4); // blink by onboard LED once per second
+            lastT = Tms;
+        }
+        if(usart1rx()){ // usart1 received data, store in in buffer
+            L = usart1_getline(&txt);
+            if(!pin_read(GPIOA, 1<<6)){ // there's a jumper: reverse string
+                txt = rline(txt, L);
+            }
+            pin_clear(GPIOA, 1<<5); // set extern LED
+        }
+        if(L){ // text waits for sending
+            if(ALL_OK == usart1_send(txt, L)){
+                L = 0;
+                pin_set(GPIOA, 1<<5); // clear extern LED
+            }
+        }else if(ostctr != Tms){
+            ostctr = Tms;
+            if(++dummyctr > 5000){ // once per 5 seconds
+                dummyctr = 0;
+                if(ALL_OK != usart1_send("Dummy text\n", 11)) pin_toggle(GPIOA, 1<<5);
+            }
+        }
+    }
+}