Posted on February 06, 2016 at 16:12I made a custom board using stm32f105rc with external 8MHz x-tal.
I think I would set the system clock with HSE,PLL,72MHz.
But each stm32f105 board's SysTick_Handler timing are not same. 10,000 tick is 1 sec.
In some board, 9645 tick is 1 sec, for other board, 9834 tick is 1 sec....
I think the system is not set to HSE/PLL, but HSI. But I'm not sure. Just guessing from different SysTick for all the board.
My program regarding clock setting are bellow.
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stmf1xx.h
#if !defined (STM32F10X_LD) && !defined (STM32F10X_LD_VL) && !defined (STM32F10X_MD) && !defined (STM32F10X_MD_VL) && !defined (STM32F10X_HD) && !defined (STM32F10X_HD_VL) && !defined (STM32F10X_XL) && !defined (STM32F10X_CL)
/* #define STM32F10X_LD */ /*!< STM32F10X_LD: STM32 Low density devices */
/* #define STM32F10X_LD_VL */ /*!< STM32F10X_LD_VL: STM32 Low density Value Line devices */
//#define STM32F10X_MD /*!< STM32F10X_MD: STM32 Medium density devices */
/* #define STM32F10X_MD_VL */ /*!< STM32F10X_MD_VL: STM32 Medium density Value Line devices */
#define STM32F10X_HD /*!< STM32F10X_HD: STM32 High density devices */
//#define STM32F10X_HD_VL /*!< STM32F10X_HD_VL: STM32 High density value line devices */
/* #define STM32F10X_XL */ /*!< STM32F10X_XL: STM32 XL-density devices */
//#define STM32F10X_CL /*!< STM32F10X_CL: STM32 Connectivity line devices */
#endif
system_stm32f1xx.c
#if defined (STM32F10X_LD_VL) || (defined STM32F10X_MD_VL) || (defined STM32F10X_HD_VL)
// #define SYSCLK_FREQ_HSE HSE_VALUE
// #define SYSCLK_FREQ_24MHz 24000000
#else
// #define SYSCLK_FREQ_HSE HSE_VALUE
/* #define SYSCLK_FREQ_24MHz 24000000 */
//#define SYSCLK_FREQ_36MHz 36000000
/* #define SYSCLK_FREQ_48MHz 48000000 */
/* #define SYSCLK_FREQ_56MHz 56000000 */
#define SYSCLK_FREQ_72MHz 72000000
#endif
