Add full ringbuffer @PL2303

F0:F030,F042,F072/PL2303_ringbuffer/main.c

@@ -0,0 +1,57 @@
+/*
+ * This file is part of the pl2303 project.
+ * Copyright 2022 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 "hardware.h"
+#include "proto.h"
+#include "ringbuffer.h"
+#include "usb.h"
+
+#define MAXSTRLEN    128
+static char inbuff[MAXSTRLEN];
+
+volatile uint32_t Tms = 0;
+
+void sys_tick_handler(void){
+    ++Tms;
+}
+
+int main(void){
+    sysreset();
+    SysTick_Config(6000, 1);
+    hw_setup();
+    USB_setup();
+
+    uint32_t ctr = Tms, msgctr = Tms;
+    while(1){
+        if(Tms - ctr > 499){
+            ctr = Tms;
+            LED_blink(LED0);
+        }
+        if(Tms - msgctr > 3999){
+            msgctr = Tms;
+            USB_sendstr("Test ping message\n");
+        }
+        USB_proc();
+        int len = USB_receivestr(inbuff, MAXSTRLEN);
+        if(len < 0) USB_sendstr("ERROR: USB buffer overflow or string was too long\n");
+        else if(len){
+            const char *ans = parse_cmd(inbuff);
+            if(ans) USB_sendstr(ans);
+        }
+    }
+}