今天在STM32参考手册中找,滴达时钟寄存器怎么也找不到,后来在网上收到,心情有点不爽
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在STM32中用到了Cortex-M3定义的三组寄存器,有关这三组寄存器的说明不在STM32的技术手册中,需要参考ARM公司发布的Cortex-M3 Technical Reference Manual (r2p0)。
在STM32的固件库中定义了三个结构体与这三个寄存器组相对应,这三个结构体与ARM手册中寄存器的对应关系如下:
一、NVIC寄存器组
STM32的固件库中有如下定义:
typedef struct { vu32 ISER[2]; u32 RESERVED0[30]; vu32 ICER[2]; u32 RSERVED1[30]; vu32 ISPR[2]; u32 RESERVED2[30]; vu32 ICPR[2]; u32 RESERVED3[30]; vu32 IABR[2]; u32 RESERVED4[62]; vu32 IPR[11]; } NVIC_TypeDef;
它们对应ARM手册中的名称为 ISER = Interrupt Set-Enable Registers ICER = Interrupt Clear-Enable Registers ISPR = Interrupt Set-Pending Register ICPR = Interrupt Clear-Pending Register IABR = Active Bit Register IPR = Interrupt Priority Registers
每个寄存器有240位,以Interrupt Set-Enable Registers说明,ISER[0]对应中断源0~31,ISER[1]对应中断源32~63,STM32只有60个中断源,所以没有ISER[2:7]。
参考STM32技术参考手册中的中断向量表,中断源的位置为: 位置0 - WWDG = Window Watchdog interrupt 位置1 - PVD = PVD through EXTI Line detection interrupt 位置2 - TAMPER = Tamper interrupt ...... 位置58 - DMA2_Channel3 = DMA2 Channel3 global interrupt 位置59 - DMA2_Channel4_5 = DMA2 Channel4 and DMA2 Channel5 global interrupts
二、系统控制寄存器组
STM32的固件库中有如下定义:
typedef struct { vuc32 CPUID; vu32 ICSR; vu32 VTOR; vu32 AIRCR; vu32 SCR; vu32 CCR; vu32 SHPR[3]; vu32 SHCSR; vu32 CFSR; vu32 HFSR; vu32 DFSR; vu32 MMFAR; vu32 BFAR; vu32 AFSR; } SCB_TypeDef; /* System Control Block Structure */
它们对应ARM手册中的名称为
CPUID = CPUID Base Register ICSR = Interrupt Control State Register VTOR = Vector Table Offset Register AIRCR = Application Interrupt/Reset Control Register SCR = System Control Register CCR = Configuration Control Register SHPR = System Handlers Priority Register SHCSR = System Handler Control and State Register CFSR = Configurable Fault Status Registers HFSR = Hard Fault Status Register DFSR = Debug Fault Status Register MMFAR = Mem Manage Address Register BFAR = Bus Fault Address Register AFSR = Auxiliary Fault Status Register
三、系统时钟寄存器组
STM32的固件库中有如下定义:
typedef struct { vu32 CTRL; vu32 LOAD; vu32 VAL; vuc32 CALIB; } SysTick_TypeDef;
它们对应ARM手册中的名称为
CTRL = SysTick Control and Status Register LOAD = SysTick Reload Value Register VAL = SysTick Current Value Register CALIB = SysTick Calibration Value Register
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