Add RT-Thread Serial Device support

SConscript

@@ -6,6 +6,9 @@ src_folder = 'SystemView_Src'
 
 cwd = GetCurrentDir()
 src = Glob(src_folder +'/Config/*.c')
+if not GetDepend('PKG_SEGGER_RTT_AS_SERIAL_DEVICE'):
+    SrcRemove(src, [src_folder + '/Config/SEGGER_RTT_Device.c'])
+
 src += Glob(src_folder +'/SEGGER/*.c')
 
 CPPPATH = [cwd, os.path.join(cwd, src_folder+'/Config')]

SystemView_Src/Config/SEGGER_RTT_Device.c

@@ -0,0 +1,110 @@
+/*
+ * File      : kservice.c
+ * This file is part of RT-Thread RTOS
+ * COPYRIGHT (C) 2006 - 2012, RT-Thread Development Team
+ *
+ *  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 2 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, write to the Free Software Foundation, Inc.,
+ *  51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Change Logs:
+ * Date           Author       Notes
+ * 2018-07-20     FlyLu        the first version
+ * 2018-07-20     Tanek        use idle hook as receive
+ */
+
+#include <rtdevice.h>
+#include <rthw.h>
+#include "SEGGER_RTT.h"
+
+static struct rt_serial_device segger_serial;
+
+static void serial1_idle(void)
+{
+    rt_hw_serial_isr(&segger_serial, RT_SERIAL_EVENT_RX_IND);
+}
+
+static rt_err_t segger_control(struct rt_serial_device *serial, int cmd, void *arg)
+{
+    static rt_bool_t sethook = RT_FALSE;
+
+    RT_ASSERT(serial != RT_NULL);
+    RT_ASSERT(arg != RT_NULL);
+
+    switch (cmd)
+    {
+    case RT_DEVICE_CTRL_CLR_INT:
+        if (sethook)
+        {
+            rt_thread_idle_delhook(serial1_idle);
+            sethook = RT_FALSE;
+        }
+        break;
+
+    case RT_DEVICE_CTRL_SET_INT:
+        if (!sethook)
+        {
+            rt_thread_idle_sethook(serial1_idle);
+            sethook = RT_TRUE;
+        }
+        break;
+    }
+
+    return RT_EOK;
+}
+
+static int segger_putc(struct rt_serial_device *serial, char c)
+{
+    RT_ASSERT(serial != RT_NULL);
+
+    return SEGGER_RTT_Write(0, &c, 1);
+}
+
+static int segger_getc(struct rt_serial_device *serial)
+{
+    char ch;
+
+    RT_ASSERT(serial != RT_NULL);
+
+    if (SEGGER_RTT_Read(0, &ch, 1) == 1)
+    {
+        return ch;
+    }
+    else
+    {
+        return -1;
+    }
+}
+
+int hw_segger_init(void)
+{
+    static const struct rt_uart_ops segger_uart_ops =
+    {
+        NULL,
+        segger_control,
+        segger_putc,
+        segger_getc,
+    };
+
+    segger_serial.ops = &segger_uart_ops;
+    segger_serial.config.bufsz = RT_SERIAL_RB_BUFSZ;
+
+    /* register segger rtt as serial device */
+    rt_hw_serial_register(&segger_serial,
+                          PKG_SERIAL_DEVICE_NAME,
+                          RT_DEVICE_FLAG_RDWR  | RT_DEVICE_FLAG_INT_RX,
+                          NULL);
+
+    return 0;
+}
+INIT_BOARD_EXPORT(hw_segger_init);