add eeprom flash emulation for G0

2026-02-28 11:54:30 +03:00 · 2023-02-18 20:02:11 +03:00
parent 2cc06884b4
commit 87d9bc17c7
18 changed files with 1155 additions and 0 deletions
--- a/G0:G070/flash/main.c
+++ b/G0:G070/flash/main.c
@@ -0,0 +1,122 @@
+/*
+ * This file is part of the usart 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>
+#include "flash.h"
+#include "strfunc.h"
+#include "usart.h"
+
+// KEY (intpullup->0) - PC0
+// LED - PC8
+
+volatile uint32_t Tms = 0;
+
+/* Called when systick fires */
+void sys_tick_handler(void){
+    ++Tms;
+}
+
+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_MODE8 | GPIO_MODER_MODE0)) | GPIO_MODER_MODER8_O;
+    GPIOC->PUPDR = GPIO_PUPDR0_PU; // pullup
+    GPIOC->OTYPER = GPIO_OTYPER_OT8; // open drain
+}
+
+static const char *helpmsg =
+        "'1' - change U16 value\n"
+        "'2' - change U32 value\n"
+        "'d' - dumpconf\n"
+        "'e' - erase flash\n"
+        "'f' - save conf to flash\n"
+        "'s' - change string (up to 31 symbol)\n"
+        "'t' - print Tms\n"
+;
+
+static void chstr(const char *s){
+    int i = 0;
+    for(; i < 31 && *s; ++i){
+        the_conf.str[i] = *s++;
+    }
+    the_conf.str[i] = 0;
+}
+
+int main(void){
+    StartHSE();
+    SysTick_Config(8000); // 1ms counter
+    flashstorage_init();
+    gpio_setup();
+    usart3_setup();
+    uint32_t T = 0;
+    int sent = 0;
+    /* Do nothing in main loop */
+    while (1){
+        if(Tms - T > 499){ // blink LED
+            T = Tms;
+            pin_toggle(GPIOC, 1<<8);
+            usart3_sendbuf();
+        }
+        if(pin_read(GPIOC, 1<<0) == 0){ // key pressed - send data over USART
+            if(!sent){
+                usart3_sendstr("Button pressed\n");
+                sent = 1;
+            }
+        }else sent = 0;
+        int wasbo = 0;
+        char *rcv = usart3_getline(&wasbo);
+        if(wasbo) usart3_sendstr("Buffer overflow occured @ last message\n");
+        if(rcv){
+            char cmd = *rcv++;
+            uint32_t U, got = 0;
+            const char *n = getnum(rcv, &U);
+            if(n != rcv) got = 1;
+            switch(cmd){
+                case '1':
+                    if(!got || U > 0xffff) SEND("Need an uint16_t number\n");
+                    else the_conf.flagU16 = (uint16_t)U;
+                    SEND("Changed to "); printuhex(the_conf.flagU16); newline();
+                break;
+                case '2':
+                    if(!got) SEND("Need an uint32_t number\n");
+                    else the_conf.flagU32 = U;
+                    SEND("Changed to "); printuhex(the_conf.flagU32); newline();
+                break;
+                case 'd':
+                    dump_userconf();
+                break;
+                case 'e':
+                    if(erase_storage()) SEND("Error erasing\n");
+                    else SEND("Erased OK\n");
+                break;
+                case 'f':
+                    if(store_userconf()) SEND("Error: can't save\n");
+                    else SEND("OK, stored\n");
+                break;
+                case 's':
+                    chstr(omit_spaces(rcv));
+                    SEND("Changed to: "); SEND(the_conf.str); newline();
+                break;
+                case 't':
+                    SEND("Tms="); printu(Tms); newline();
+                break;
+                default: SEND(helpmsg);
+            }
+        }
+    }
+}