diff options
Diffstat (limited to 'src/stm32lib/examples/CortexM3/BitBand/main.c')
| -rwxr-xr-x | src/stm32lib/examples/CortexM3/BitBand/main.c | 191 |
1 files changed, 191 insertions, 0 deletions
diff --git a/src/stm32lib/examples/CortexM3/BitBand/main.c b/src/stm32lib/examples/CortexM3/BitBand/main.c new file mode 100755 index 0000000..36188fc --- /dev/null +++ b/src/stm32lib/examples/CortexM3/BitBand/main.c @@ -0,0 +1,191 @@ +/******************** (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 RAM_BASE 0x20000000
+#define RAM_BB_BASE 0x22000000
+
+/* Private macro -------------------------------------------------------------*/
+#define Var_ResetBit_BB(VarAddr, BitNumber) \
+ (*(vu32 *) (RAM_BB_BASE | ((VarAddr - RAM_BASE) << 5) | ((BitNumber) << 2)) = 0)
+
+#define Var_SetBit_BB(VarAddr, BitNumber) \
+ (*(vu32 *) (RAM_BB_BASE | ((VarAddr - RAM_BASE) << 5) | ((BitNumber) << 2)) = 1)
+
+#define Var_GetBit_BB(VarAddr, BitNumber) \
+ (*(vu32 *) (RAM_BB_BASE | ((VarAddr - RAM_BASE) << 5) | ((BitNumber) << 2)))
+
+/* Private variables ---------------------------------------------------------*/
+ErrorStatus HSEStartUpStatus;
+vu32 Var, VarAddr = 0, VarBitValue = 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
+
+ Var = 0x00005AA5;
+
+ /* Clock configuration */
+ RCC_Configuration();
+
+ /* NVIC configuration */
+ NVIC_Configuration();
+
+/* A mapping formula shows how to reference each word in the alias region to a corresponding
+bit in the bit-band region. The mapping formula is:
+ bit_word_addr = bit_band_base + (byte_offset x 32) + (bit_number × 4)
+
+where:
+ - bit_word_addr: is the address of the word in the alias memory region that maps to the
+ targeted bit.
+ - bit_band_base is the starting address of the alias region
+ - byte_offset is the number of the byte in the bit-band region that contains the targeted bit
+ - bit_number is the bit position (0-7) of the targeted bit */
+
+/* Get the variable address --------------------------------------------------*/
+ VarAddr = (u32)&Var;
+
+/* Modify variable bit using bit-band access ---------------------------------*/
+ /* Modify Var variable bit 0 -----------------------------------------------*/
+ Var_ResetBit_BB(VarAddr, 0); /* Var = 0x00005AA4 */
+ Var_SetBit_BB(VarAddr, 0); /* Var = 0x00005AA5 */
+
+ /* Modify Var variable bit 11 -----------------------------------------------*/
+ Var_ResetBit_BB(VarAddr, 11); /* Var = 0x000052A5 */
+ /* Get Var variable bit 11 value */
+ VarBitValue = Var_GetBit_BB(VarAddr, 11); /* VarBitValue = 0x00000000 */
+
+ Var_SetBit_BB(VarAddr, 11); /* Var = 0x00005AA5 */
+ /* Get Var variable bit 11 value */
+ VarBitValue = Var_GetBit_BB(VarAddr, 11); /* VarBitValue = 0x00000001 */
+
+ /* Modify Var variable bit 31 -----------------------------------------------*/
+ Var_SetBit_BB(VarAddr, 31); /* Var = 0x80005AA5 */
+ /* Get Var variable bit 31 value */
+ VarBitValue = Var_GetBit_BB(VarAddr, 31); /* VarBitValue = 0x00000001 */
+
+ Var_ResetBit_BB(VarAddr, 31); /* Var = 0x00005AA5 */
+ /* Get Var variable bit 31 value */
+ VarBitValue = Var_GetBit_BB(VarAddr, 31); /* VarBitValue = 0x00000000 */
+
+ 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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