[bsp]add gdb support for BBB

bsp/beaglebone/applications/application.c

@@ -16,6 +16,10 @@
 #include <rtthread.h>
 #include <components.h>
 
+#ifdef RT_USING_GDB
+#include <gdb_stub.h>
+#endif
+
 int rt_application_init()
 {
     /* do component initialization */
@@ -23,6 +27,10 @@ int rt_application_init()
 #ifdef RT_USING_NEWLIB
 	libc_system_init(RT_CONSOLE_DEVICE_NAME);
 #endif
+#ifdef RT_USING_GDB
+    gdb_set_device("uart4");
+    gdb_start();
+#endif
 
     return 0;
 }

bsp/beaglebone/drivers/serial.c

@@ -80,6 +80,11 @@ static rt_err_t am33xx_configure(struct rt_serial_device *serial, struct serial_
         UART_DLL_REG(base) = 26;
         UART_DLH_REG(base) = 0;
     }
+    else if (cfg->baud_rate == BAUD_RATE_9600)
+    {
+        UART_DLL_REG(base) = 0x38;
+        UART_DLH_REG(base) = 1;
+    }
     else
     {
         NOT_IMPLEMENTED();
@@ -439,7 +444,7 @@ int rt_hw_serial_init(void)
 #endif
 
 #ifdef RT_USING_UART4
-    config.baud_rate = BAUD_RATE_115200;
+    config.baud_rate = BAUD_RATE_9600;
     config.bit_order = BIT_ORDER_LSB;
     config.data_bits = DATA_BITS_8;
     config.parity    = PARITY_NONE;
@@ -450,14 +455,14 @@ int rt_hw_serial_init(void)
     serial4.ops    = &am33xx_uart_ops;
     serial4.config = config;
     /* enable RX interrupt */
-    UART_IER_REG(uart4.base) = 0x01;
+    UART_IER_REG(uart4.base) = 0x00;
     /* install ISR */
     rt_hw_interrupt_install(uart4.irq, am33xx_uart_isr, &serial4, "uart4");
     rt_hw_interrupt_control(uart4.irq, 0, 0);
     rt_hw_interrupt_mask(uart4.irq);
     /* register UART4 device */
     rt_hw_serial_register(&serial4, "uart4",
-            RT_DEVICE_FLAG_RDWR | RT_DEVICE_FLAG_INT_RX,
+            RT_DEVICE_FLAG_RDWR | RT_DEVICE_FLAG_STREAM,
             &uart4);
 #endif
 

bsp/beaglebone/rtconfig.h

@@ -2,6 +2,12 @@
 #ifndef __RTTHREAD_CFG_H__
 #define __RTTHREAD_CFG_H__
 
+// <section name="RT_USING_GDB" description="Gdb Stub for rtt" default="true" >
+//#define RT_USING_GDB
+//#define RT_GDB_DEBUG
+#define RT_GDB_ICACHE
+// </section>
+
 // <RDTConfigurator URL="http://www.rt-thread.com/eclipse">
 
 // <integer name="RT_NAME_MAX" description="Maximal size of kernel object name length" default="6" />

bsp/beaglebone/rtconfig.py

@@ -23,7 +23,7 @@ elif CROSS_TOOL == 'iar':
 if os.getenv('RTT_EXEC_PATH'):
 	EXEC_PATH = os.getenv('RTT_EXEC_PATH')
 
-BUILD = 'release'
+BUILD = 'debug'
 
 if PLATFORM == 'gcc':
     # toolchains