update stm32f107 project

git-svn-id: https://rt-thread.googlecode.com/svn/trunk@1733 bbd45198-f89e-11dd-88c7-29a3b14d5316

bsp/stm32f107/stm32_rom.icf

@@ -31,4 +31,4 @@ place at address mem:__ICFEDIT_intvec_start__ { readonly section .intvec };
 
 place in ROM_region   { readonly };
 place in RAM_region   { readwrite,
-                        block CSTACK, block HEAP };
+                        block CSTACK, last block HEAP };

bsp/stm32f107/usart.c

@@ -189,7 +189,8 @@ static void NVIC_Configuration(void)
 #ifdef RT_USING_UART1
 	/* Enable the USART1 Interrupt */
 	NVIC_InitStructure.NVIC_IRQChannel = USART1_IRQn;
-	NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;
+	NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 1;
+	NVIC_InitStructure.NVIC_IRQChannelSubPriority = 1;
 	NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
 	NVIC_Init(&NVIC_InitStructure);
 #endif
@@ -197,6 +198,7 @@ static void NVIC_Configuration(void)
 #ifdef RT_USING_UART2
 	/* Enable the USART2 Interrupt */
 	NVIC_InitStructure.NVIC_IRQChannel = USART2_IRQn;
+	NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 1;
 	NVIC_InitStructure.NVIC_IRQChannelSubPriority = 1;
 	NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
 	NVIC_Init(&NVIC_InitStructure);
@@ -205,12 +207,14 @@ static void NVIC_Configuration(void)
 #ifdef RT_USING_UART3
 	/* Enable the USART3 Interrupt */
 	NVIC_InitStructure.NVIC_IRQChannel = USART3_IRQn;
+	NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 1;
 	NVIC_InitStructure.NVIC_IRQChannelSubPriority = 1;
 	NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
 	NVIC_Init(&NVIC_InitStructure);
 
 	/* Enable the DMA1 Channel2 Interrupt */
 	NVIC_InitStructure.NVIC_IRQChannel = DMA1_Channel2_IRQn;
+	NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 1;
 	NVIC_InitStructure.NVIC_IRQChannelSubPriority = 1;
 	NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
 	NVIC_Init(&NVIC_InitStructure);