feat: 保存已验证的CH390网络打通基线

Core/Src/retarget_rtt.c

@@ -0,0 +1,118 @@
+#include <rt_sys.h>
+#include <stdio.h>
+#include <string.h>
+
+#pragma import(__use_no_semihosting)
+
+const char __stdin_name[] = ":tt";
+const char __stdout_name[] = ":tt";
+const char __stderr_name[] = ":tt";
+
+#define NULL_FH_STDIN   0x8001
+#define NULL_FH_STDOUT  0x8002
+#define NULL_FH_STDERR  0x8003
+
+static int rtt_is_terminal_name(const char *name)
+{
+    return (name != NULL) && (strcmp(name, ":tt") == 0);
+}
+
+FILEHANDLE _sys_open(const char *name, int openmode)
+{
+    if (!rtt_is_terminal_name(name)) {
+        return -1;
+    }
+
+    if ((openmode & OPEN_W) == OPEN_W) {
+        return NULL_FH_STDOUT;
+    }
+
+    if ((openmode & OPEN_A) == OPEN_A) {
+        return NULL_FH_STDERR;
+    }
+
+    return NULL_FH_STDIN;
+}
+
+int _sys_close(FILEHANDLE fh)
+{
+    (void)fh;
+    return 0;
+}
+
+int _sys_write(FILEHANDLE fh, const unsigned char *buf, unsigned len, int mode)
+{
+    (void)mode;
+
+    if ((fh != NULL_FH_STDOUT) && (fh != NULL_FH_STDERR)) {
+        return -1;
+    }
+
+    if ((buf == NULL) || (len == 0u)) {
+        return 0;
+    }
+
+    (void)buf;
+    (void)len;
+    return 0;
+}
+
+int _sys_read(FILEHANDLE fh, unsigned char *buf, unsigned len, int mode)
+{
+    (void)fh;
+    (void)buf;
+    (void)len;
+    (void)mode;
+    return -1;
+}
+
+int _sys_istty(FILEHANDLE fh)
+{
+    return (fh == NULL_FH_STDIN) || (fh == NULL_FH_STDOUT) || (fh == NULL_FH_STDERR);
+}
+
+int _sys_seek(FILEHANDLE fh, long pos)
+{
+    (void)fh;
+    (void)pos;
+    return -1;
+}
+
+int _sys_ensure(FILEHANDLE fh)
+{
+    (void)fh;
+    return 0;
+}
+
+long _sys_flen(FILEHANDLE fh)
+{
+    (void)fh;
+    return 0;
+}
+
+int _sys_tmpnam(char *name, int sig, unsigned maxlen)
+{
+    (void)name;
+    (void)sig;
+    (void)maxlen;
+    return 0;
+}
+
+char *_sys_command_string(char *cmd, int len)
+{
+    (void)cmd;
+    (void)len;
+    return NULL;
+}
+
+void _ttywrch(int ch)
+{
+    (void)ch;
+}
+
+void _sys_exit(int returncode)
+{
+    (void)returncode;
+    while (1) {
+    }
+}