add new concept USB-CDC template for STM32F303

F3:F303/USB_template_CDC/proto.c

@@ -0,0 +1,53 @@
+#include <stm32f3.h>
+#include <string.h>
+
+#include "strfunc.h"
+#include "usb_dev.h"
+#include "version.inc"
+
+//#define LOCBUFFSZ       (32)
+// local buffer for I2C data to send
+//static uint8_t locBuffer[LOCBUFFSZ];
+extern volatile uint32_t Tms;
+
+const char *helpstring =
+        "https://github.com/eddyem/stm32samples/tree/master/F3:F303/USB_template build#" BUILD_NUMBER " @ " BUILD_DATE "\n"
+        "T - print current Tms\n"
+;
+/*
+// read N numbers from buf, @return 0 if wrong or none
+TRUE_INLINE uint16_t readNnumbers(const char *buf){
+    uint32_t D;
+    const char *nxt;
+    uint16_t N = 0;
+    while((nxt = getnum(buf, &D)) && nxt != buf && N < LOCBUFFSZ){
+        buf = nxt;
+        locBuffer[N++] = (uint8_t) D&0xff;
+        USND("add byte: "); USND(uhex2str(D&0xff)); USND("\n");
+    }
+    USND("Send "); USND(u2str(N)); USND(" bytes\n");
+    return N;
+}
+*/
+
+
+const char *parse_cmd(const char *buf){
+    // "long" commands
+  /*  switch(*buf){
+        case '':
+        break;
+    }*/
+    // "short" commands
+    if(buf[1]) return buf; // echo wrong data
+    switch(*buf){
+        case 'T':
+            USB_sendstr("T=");
+            USB_sendstr(u2str(Tms));
+            newline();
+        break;
+        default: // help
+            USB_sendstr(helpstring);
+        break;
+    }
+    return NULL;
+}