rtt: Add gdb monitor rtt down command

UsingRTT.md

@@ -121,7 +121,11 @@ grep 2000 HelloWorld.ino.map | grep RTT
     sets RTT ident to *string*. If *string* contains a space, replace the space with an
         underscore _. Setting ident string is optional, RTT works fine without.
 
-- `monitor rtt ident`
+- ``monitor rtt send string``
+
+	push *string* to the RTT down buffer. It is equivalent to pushing the string to ttyBmpTarg.
+
+- ``monitor rtt ident``
 
     clears ident string. (default)
 

src/command.c

@@ -104,8 +104,8 @@ const command_s cmd_list[] = {
 #endif
 #ifdef ENABLE_RTT
 	{"rtt", cmd_rtt,
-		"[enable|disable|status|channel [0..15 ...]|ident [STR]|cblock|ram [RAM_START RAM_END]|poll [MAXMS MINMS "
-		"MAXERR]]"},
+		"[enable|disable|status|channel [0..15 ...]|ident [STR]|send [STR]|cblock|ram [RAM_START RAM_END]|"
+		"poll [MAXMS MINMS MAXERR]]"},
 #endif
 #ifdef PLATFORM_HAS_TRACESWO
 #if defined TRACESWO_PROTOCOL && TRACESWO_PROTOCOL == 2
@@ -572,6 +572,9 @@ static bool cmd_rtt(target_s *t, int argc, const char **argv)
 			if (rtt_ident[i] == '_')
 				rtt_ident[i] = ' ';
 		}
+	} else if (argc == 3 && strncmp(argv[1], "send", command_len) == 0) {
+		size_t len = strlen(argv[2]);
+		rtt_load_recv_buf(argv[2], len);
 	} else if (argc == 2 && strncmp(argv[1], "ram", command_len) == 0)
 		rtt_flag_ram = false;
 	else if (argc == 4 && strncmp(argv[1], "ram", command_len) == 0) {

src/include/rtt.h

@@ -60,5 +60,6 @@ typedef struct rtt_channel {
 extern rtt_channel_s rtt_channel[MAX_RTT_CHAN];
 
 void poll_rtt(target_s *cur_target);
+void rtt_load_recv_buf(const char *data_buf, size_t len);
 
 #endif /* INCLUDE_RTT_H */

src/platforms/common/stm32/rtt_if.c

@@ -58,9 +58,20 @@ inline static bool recv_set_nak()
 	return recv_bytes_free() < 2U * CDCACM_PACKET_SIZE;
 }
 
+void rtt_load_recv_buf(const char *data_buf, size_t len)
+{
+	/* copy data to recv_buf */
+	for (size_t i = 0; i < len; i++) {
+		uint32_t next_recv_head = (recv_head + 1U) % sizeof(recv_buf);
+		if (next_recv_head == recv_tail)
+			break; /* overflow */
+		recv_buf[recv_head] = data_buf[i];
+		recv_head = next_recv_head;
+	}
+}
+
 /* debug_serial_receive_callback is called when usb uart has received new data for target.
    this routine has to be fast */
-
 void rtt_serial_receive_callback(usbd_device *dev, uint8_t ep)
 {
 	(void)dev;
@@ -78,14 +89,7 @@ void rtt_serial_receive_callback(usbd_device *dev, uint8_t ep)
 		return;
 	}
 
-	/* copy data to recv_buf */
-	for (int i = 0; i < len; i++) {
-		uint32_t next_recv_head = (recv_head + 1U) % sizeof(recv_buf);
-		if (next_recv_head == recv_tail)
-			break; /* overflow */
-		recv_buf[recv_head] = usb_buf[i];
-		recv_head = next_recv_head;
-	}
+	rtt_load_recv_buf(usb_buf, len);
 
 	/* block flag: flow control closed if not enough free buffer space */
 	if (!(rtt_flag_block && recv_set_nak()))

src/platforms/launchpad-icdi/rtt_if.c

@@ -58,6 +58,18 @@ inline static bool recv_set_nak()
 	return recv_bytes_free() < 2U * CDCACM_PACKET_SIZE;
 }
 
+void rtt_load_recv_buf(const char *data_buf, size_t len)
+{
+	/* copy data to recv_buf */
+	for (size_t i = 0; i < len; i++) {
+		uint32_t next_recv_head = (recv_head + 1U) % sizeof(recv_buf);
+		if (next_recv_head == recv_tail)
+			break; /* overflow */
+		recv_buf[recv_head] = data_buf[i];
+		recv_head = next_recv_head;
+	}
+}
+
 /* debug_serial_receive_callback is called when usb uart has received new data for target.
    this routine has to be fast */
 
@@ -78,14 +90,7 @@ void rtt_serial_receive_callback(usbd_device *dev, uint8_t ep)
 		return;
 	}
 
-	/* copy data to recv_buf */
-	for (int i = 0; i < len; i++) {
-		uint32_t next_recv_head = (recv_head + 1U) % sizeof(recv_buf);
-		if (next_recv_head == recv_tail)
-			break; /* overflow */
-		recv_buf[recv_head] = usb_buf[i];
-		recv_head = next_recv_head;
-	}
+	rtt_load_recv_buf(usb_buf, len);
 
 	/* block flag: flow control closed if not enough free buffer space */
 	if (!(rtt_flag_block && recv_set_nak()))