diff options
Diffstat (limited to 'src/stm32lib/examples/CortexM3/Mode_Privilege/main.c')
| -rwxr-xr-x | src/stm32lib/examples/CortexM3/Mode_Privilege/main.c | 217 |
1 files changed, 217 insertions, 0 deletions
diff --git a/src/stm32lib/examples/CortexM3/Mode_Privilege/main.c b/src/stm32lib/examples/CortexM3/Mode_Privilege/main.c new file mode 100755 index 0000000..6946220 --- /dev/null +++ b/src/stm32lib/examples/CortexM3/Mode_Privilege/main.c @@ -0,0 +1,217 @@ +/******************** (C) COPYRIGHT 2008 STMicroelectronics ********************
+* File Name : main.c
+* Author : MCD Application Team
+* Version : V2.0.1
+* Date : 06/13/2008
+* Description : Main program body.
+********************************************************************************
+* THE PRESENT FIRMWARE WHICH IS FOR GUIDANCE ONLY AIMS AT PROVIDING CUSTOMERS
+* WITH CODING INFORMATION REGARDING THEIR PRODUCTS IN ORDER FOR THEM TO SAVE TIME.
+* AS A RESULT, STMICROELECTRONICS SHALL NOT BE HELD LIABLE FOR ANY DIRECT,
+* INDIRECT OR CONSEQUENTIAL DAMAGES WITH RESPECT TO ANY CLAIMS ARISING FROM THE
+* CONTENT OF SUCH FIRMWARE AND/OR THE USE MADE BY CUSTOMERS OF THE CODING
+* INFORMATION CONTAINED HEREIN IN CONNECTION WITH THEIR PRODUCTS.
+*******************************************************************************/
+
+/* Includes ------------------------------------------------------------------*/
+#include "stm32f10x_lib.h"
+
+/* Private typedef -----------------------------------------------------------*/
+/* Private define ------------------------------------------------------------*/
+#define SP_PROCESS_SIZE 0x200 /* Process stack size */
+#define SP_PROCESS 0x02 /* Process stack */
+#define SP_MAIN 0x00 /* Main stack */
+#define THREAD_MODE_PRIVILEGED 0x00 /* Thread mode has privileged access */
+#define THREAD_MODE_UNPRIVILEGED 0x01 /* Thread mode has unprivileged access */
+
+/* Private macro -------------------------------------------------------------*/
+/* Private variables ---------------------------------------------------------*/
+ErrorStatus HSEStartUpStatus;
+vu8 PSPMemAlloc[SP_PROCESS_SIZE];
+vu32 Index = 0, PSPValue = 0, CurrentStack = 0, ThreadMode = 0;
+
+/* Private function prototypes -----------------------------------------------*/
+void RCC_Configuration(void);
+void NVIC_Configuration(void);
+
+/* Private functions ---------------------------------------------------------*/
+/*******************************************************************************
+* Function Name : main
+* Description : Main program.
+* Input : None
+* Output : None
+* Return : None
+*******************************************************************************/
+int main(void)
+{
+#ifdef DEBUG
+ debug();
+#endif
+
+ /* Clock configuration */
+ RCC_Configuration();
+
+ /* NVIC configuration */
+ NVIC_Configuration();
+
+
+/* Switch Thread mode Stack from Main to Process -----------------------------*/
+ /* Initialize memory reserved for Process Stack */
+ for(Index = 0; Index < SP_PROCESS_SIZE; Index++)
+ {
+ PSPMemAlloc[Index] = 0x00;
+ }
+
+ /* Set Process stack value */
+ __MSR_PSP((u32)PSPMemAlloc + SP_PROCESS_SIZE);
+
+ /* Select Process Stack as Thread mode Stack */
+ __MSR_CONTROL(SP_PROCESS);
+
+ /* Get the Thread mode stack used */
+ if((__MRS_CONTROL() & 0x02) == SP_MAIN)
+ {
+ /* Main stack is used as the current stack */
+ CurrentStack = SP_MAIN;
+ }
+ else
+ {
+ /* Process stack is used as the current stack */
+ CurrentStack = SP_PROCESS;
+
+ /* Get process stack pointer value */
+ PSPValue = __MRS_PSP();
+ }
+
+/* Switch Thread mode from privileged to unprivileged ------------------------*/
+ /* Thread mode has unprivileged access */
+ __MSR_CONTROL(THREAD_MODE_UNPRIVILEGED | SP_PROCESS);
+ /* Unprivileged access mainly affect ability to:
+ - Use or not use certain instructions such as MSR fields
+ - Access System Control Space (SCS) registers such as NVIC and SysTick */
+
+ /* Check Thread mode privilege status */
+ if((__MRS_CONTROL() & 0x01) == THREAD_MODE_PRIVILEGED)
+ {
+ /* Thread mode has privileged access */
+ ThreadMode = THREAD_MODE_PRIVILEGED;
+ }
+ else
+ {
+ /* Thread mode has unprivileged access*/
+ ThreadMode = THREAD_MODE_UNPRIVILEGED;
+ }
+
+/* Switch back Thread mode from unprivileged to privileged -------------------*/
+ /* Try to switch back Thread mode to privileged (Not possible, this can be
+ done only in Handler mode) */
+ __MSR_CONTROL(THREAD_MODE_PRIVILEGED | SP_PROCESS);
+
+ /* Generate a system call exception, and in the ISR switch back Thread mode
+ to privileged */
+ __SVC();
+
+ /* Check Thread mode privilege status */
+ if((__MRS_CONTROL() & 0x01) == THREAD_MODE_PRIVILEGED)
+ {
+ /* Thread mode has privileged access */
+ ThreadMode = THREAD_MODE_PRIVILEGED;
+ }
+ else
+ {
+ /* Thread mode has unprivileged access*/
+ ThreadMode = THREAD_MODE_UNPRIVILEGED;
+ }
+
+ while (1)
+ {
+ }
+}
+
+/*******************************************************************************
+* Function Name : RCC_Configuration
+* Description : Configures the different system clocks.
+* Input : None
+* Output : None
+* Return : None
+*******************************************************************************/
+void RCC_Configuration(void)
+{
+ /* RCC system reset(for debug purpose) */
+ RCC_DeInit();
+
+ /* Enable HSE */
+ RCC_HSEConfig(RCC_HSE_ON);
+
+ /* Wait till HSE is ready */
+ HSEStartUpStatus = RCC_WaitForHSEStartUp();
+
+ if(HSEStartUpStatus == SUCCESS)
+ {
+ /* Enable Prefetch Buffer */
+ FLASH_PrefetchBufferCmd(FLASH_PrefetchBuffer_Enable);
+
+ /* Flash 0 wait state */
+ FLASH_SetLatency(FLASH_Latency_0);
+
+ /* HCLK = SYSCLK */
+ RCC_HCLKConfig(RCC_SYSCLK_Div1);
+
+ /* PCLK2 = HCLK */
+ RCC_PCLK2Config(RCC_HCLK_Div1);
+
+ /* PCLK1 = HCLK */
+ RCC_PCLK1Config(RCC_HCLK_Div1);
+
+ /* Select HSE as system clock source */
+ RCC_SYSCLKConfig(RCC_SYSCLKSource_HSE);
+
+ /* Wait till HSE is used as system clock source */
+ while(RCC_GetSYSCLKSource() != 0x04)
+ {
+ }
+ }
+}
+
+/*******************************************************************************
+* Function Name : NVIC_Configuration
+* Description : Configures NVIC and Vector Table base location.
+* Input : None
+* Output : None
+* Return : None
+*******************************************************************************/
+void NVIC_Configuration(void)
+{
+#ifdef VECT_TAB_RAM
+ /* Set the Vector Table base location at 0x20000000 */
+ NVIC_SetVectorTable(NVIC_VectTab_RAM, 0x0);
+#else /* VECT_TAB_FLASH */
+ /* Set the Vector Table base location at 0x08000000 */
+ NVIC_SetVectorTable(NVIC_VectTab_FLASH, 0x0);
+#endif
+}
+
+
+#ifdef DEBUG
+/*******************************************************************************
+* Function Name : assert_failed
+* Description : Reports the name of the source file and the source line number
+* where the assert_param error has occurred.
+* Input : - file: pointer to the source file name
+* - line: assert_param error line source number
+* Output : None
+* Return : None
+*******************************************************************************/
+void assert_failed(u8* file, u32 line)
+{
+ /* User can add his own implementation to report the file name and line number,
+ ex: printf("Wrong parameters value: file %s on line %d\r\n", file, line) */
+
+ /* Infinite loop */
+ while (1)
+ {
+ }
+}
+#endif
+
+/******************* (C) COPYRIGHT 2008 STMicroelectronics *****END OF FILE****/
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