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Diffstat (limited to 'tmp/STM32F10x_StdPeriph_Lib_V3.5.0/Project/STM32F10x_StdPeriph_Examples/CortexM3/BitBand/main.c')
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1 files changed, 144 insertions, 0 deletions
diff --git a/tmp/STM32F10x_StdPeriph_Lib_V3.5.0/Project/STM32F10x_StdPeriph_Examples/CortexM3/BitBand/main.c b/tmp/STM32F10x_StdPeriph_Lib_V3.5.0/Project/STM32F10x_StdPeriph_Examples/CortexM3/BitBand/main.c new file mode 100644 index 0000000..3074221 --- /dev/null +++ b/tmp/STM32F10x_StdPeriph_Lib_V3.5.0/Project/STM32F10x_StdPeriph_Examples/CortexM3/BitBand/main.c @@ -0,0 +1,144 @@ +/** + ****************************************************************************** + * @file CortexM3/BitBand/main.c + * @author MCD Application Team + * @version V3.5.0 + * @date 08-April-2011 + * @brief Main program body. + ****************************************************************************** + * @attention + * + * 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. + * + * <h2><center>© COPYRIGHT 2011 STMicroelectronics</center></h2> + ****************************************************************************** + */ + +/* Includes ------------------------------------------------------------------*/ +#include "stm32f10x.h" + +/** @addtogroup STM32F10x_StdPeriph_Examples + * @{ + */ + +/** @addtogroup CortexM3_BitBand + * @{ + */ + +/* Private typedef -----------------------------------------------------------*/ +/* Private define ------------------------------------------------------------*/ +#define RAM_BASE 0x20000000 +#define RAM_BB_BASE 0x22000000 + +/* Private macro -------------------------------------------------------------*/ +#define Var_ResetBit_BB(VarAddr, BitNumber) \ + (*(__IO uint32_t *) (RAM_BB_BASE | ((VarAddr - RAM_BASE) << 5) | ((BitNumber) << 2)) = 0) + +#define Var_SetBit_BB(VarAddr, BitNumber) \ + (*(__IO uint32_t *) (RAM_BB_BASE | ((VarAddr - RAM_BASE) << 5) | ((BitNumber) << 2)) = 1) + +#define Var_GetBit_BB(VarAddr, BitNumber) \ + (*(__IO uint32_t *) (RAM_BB_BASE | ((VarAddr - RAM_BASE) << 5) | ((BitNumber) << 2))) + +/* Private variables ---------------------------------------------------------*/ + +__IO uint32_t Var, VarAddr = 0, VarBitValue = 0; + +/* Private function prototypes -----------------------------------------------*/ +/* Private functions ---------------------------------------------------------*/ + +/** + * @brief Main program. + * @param None + * @retval None + */ +int main(void) +{ + /*!< At this stage the microcontroller clock setting is already configured, + this is done through SystemInit() function which is called from startup + file (startup_stm32f10x_xx.s) before to branch to application main. + To reconfigure the default setting of SystemInit() function, refer to + system_stm32f10x.c file + */ + + Var = 0x00005AA5; + +/* 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 = (uint32_t)&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) + { + } +} + +#ifdef USE_FULL_ASSERT + +/** + * @brief Reports the name of the source file and the source line number + * where the assert_param error has occurred. + * @param file: pointer to the source file name + * @param line: assert_param error line source number + * @retval None + */ +void assert_failed(uint8_t* file, uint32_t 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 2011 STMicroelectronics *****END OF FILE****/ |