STM32中用到的Cortex-M3寄存器說明

在STM32中用到了Cortex-M3定義的三組寄存器，有關這三組寄存器的說明不在STM32的技術手冊中，需要參考ARM公司發布的Cortex-M3 Technical Reference Manual (r2p0)。

在STM32的固件庫中定義了三個結構體與這三個寄存器組相對應，這三個結構體與ARM手冊中寄存器的對應關系如下：

一、NVIC寄存器組

STM32的固件庫中有如下定義：

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;

它們對應ARM手冊中的名稱為

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

每個寄存器有240位，以Interrupt Set-Enable Registers說明，ISER[0]對應中斷源0~31，ISER[1]對應中斷源32~63，STM32只有60個中斷源，所以沒有ISER[2:7]。

參考STM32技術參考手冊中的中斷向量表，中斷源的位置為：

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、系統控制寄存器組

STM32的固件庫中有如下定義：

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 */

它們對應ARM手冊中的名稱為

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、系統時鐘寄存器組

STM32的固件庫中有如下定義：

typedef struct

{

vu32 CTRL;

vu32 LOAD;

vu32 VAL;

vuc32 CALIB;

} SysTick_TypeDef;

它們對應ARM手冊中的名稱為

CTRL = SysTick Control and Status Register

LOAD = SysTick Reload Value Register

VAL = SysTick Current Value Register

CALIB = SysTick Calibration Value Register