restructuring

F1:F103/DHT22_DHT11/proto.c

@@ -0,0 +1,95 @@
+/*
+ * This file is part of the DHT22 project.
+ * Copyright 2021 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 "dht.h"
+#include "proto.h"
+#include "usb.h"
+
+extern volatile uint32_t Tms;
+
+static const char *helpmesg =
+        "'M' - start measurement\n"
+        "'S' - get DHT state\n"
+        "'R' - software reset\n"
+        "'W' - test watchdog\n"
+;
+
+const char *parse_cmd(const char *buf){
+    if(buf[1] != '\n') return buf;
+    switch(*buf){
+        case 'M':
+            if(DHT_start(Tms)) return "Started\n";
+            else return "Wait a little\n";
+        break;
+        case 'R':
+            USB_send("Soft reset\n");
+            NVIC_SystemReset();
+        break;
+        case 'S':
+            switch(DHT_getstate()){
+                case DHT_SLEEP:
+                    return "Sleeping\n";
+                case DHT_RESETTING:
+                    return "Resetting\n";
+                case DHT_MEASURING:
+                    return "Measuring\n";
+                case DHT_GOTRESULT:
+                    return "Results are ready\n";
+                default:
+                    return "Not found\n";
+            }
+        case 'W':
+            USB_send("Wait for reboot\n");
+            while(1){nop();};
+        break;
+        default: // help
+            return helpmesg;
+        break;
+    }
+    return NULL;
+}
+
+static char *_2str(uint32_t  val, uint8_t minus){
+    static char strbuf[12];
+    char *bufptr = &strbuf[11];
+    *bufptr = 0;
+    if(!val){
+        *(--bufptr) = '0';
+    }else{
+        while(val){
+            *(--bufptr) = val % 10 + '0';
+            val /= 10;
+        }
+    }
+    if(minus) *(--bufptr) = '-';
+    return bufptr;
+}
+
+// return string with number `val`
+char *u2str(uint32_t val){
+    return _2str(val, 0);
+}
+char *i2str(int32_t i){
+    uint8_t minus = 0;
+    uint32_t val;
+    if(i < 0){
+        minus = 1;
+        val = -i;
+    }else val = i;
+    return _2str(val, minus);
+}