1、添加移植文件
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ports/cortex_m3/keil/src/tx_initialize_low_level.s
Normal file
121
ports/cortex_m3/keil/src/tx_initialize_low_level.s
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IMPORT _tx_thread_system_stack_ptr
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IMPORT _tx_initialize_unused_memory
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IMPORT _tx_timer_interrupt
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IMPORT __main
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IMPORT __initial_sp
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IMPORT __Vectors
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SYSTEM_CLOCK EQU 72000000
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SYSTICK_CYCLES EQU ((SYSTEM_CLOCK / 1000) -1)
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AREA ||.text||, CODE, READONLY
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;VOID _tx_initialize_low_level(VOID)
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;{
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EXPORT _tx_initialize_low_level
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_tx_initialize_low_level
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;
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; /* Disable interrupts during ThreadX initialization. */
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;
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CPSID i
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;
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; /* Set base of available memory to end of non-initialised RAM area. */
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;
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LDR r0, =_tx_initialize_unused_memory ; Build address of unused memory pointer
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LDR r1, =__initial_sp ; Build first free address
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ADD r1, r1, #4 ;
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STR r1, [r0] ; Setup first unused memory pointer
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;
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; /* Setup Vector Table Offset Register. */
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;
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MOV r0, #0xE000E000 ; Build address of NVIC registers
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LDR r1, =__Vectors ; Pickup address of vector table
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STR r1, [r0, #0xD08] ; Set vector table address
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;
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; /* Enable the cycle count register. */
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;
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; LDR r0, =0xE0001000 ; Build address of DWT register
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; LDR r1, [r0] ; Pickup the current value
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; ORR r1, r1, #1 ; Set the CYCCNTENA bit
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; STR r1, [r0] ; Enable the cycle count register
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;
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; /* Set system stack pointer from vector value. */
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;
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LDR r0, =_tx_thread_system_stack_ptr ; Build address of system stack pointer
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LDR r1, =__Vectors ; Pickup address of vector table
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LDR r1, [r1] ; Pickup reset stack pointer
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STR r1, [r0] ; Save system stack pointer
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;
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; /* Configure SysTick for 100Hz clock, or 16384 cycles if no reference. */
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;
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MOV r0, #0xE000E000 ; Build address of NVIC registers
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LDR r1, =SYSTICK_CYCLES
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STR r1, [r0, #0x14] ; Setup SysTick Reload Value
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MOV r1, #0x7 ; Build SysTick Control Enable Value
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STR r1, [r0, #0x10] ; Setup SysTick Control
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;
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; /* Configure handler priorities. */
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;
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LDR r1, =0x00000000 ; Rsrv, UsgF, BusF, MemM
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STR r1, [r0, #0xD18] ; Setup System Handlers 4-7 Priority Registers
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LDR r1, =0xFF000000 ; SVCl, Rsrv, Rsrv, Rsrv
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STR r1, [r0, #0xD1C] ; Setup System Handlers 8-11 Priority Registers
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; Note: SVC must be lowest priority, which is 0xFF
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LDR r1, =0x40FF0000 ; SysT, PnSV, Rsrv, DbgM
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STR r1, [r0, #0xD20] ; Setup System Handlers 12-15 Priority Registers
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; Note: PnSV must be lowest priority, which is 0xFF
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;
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; /* Return to caller. */
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;
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BX lr
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;}
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;/* Define shells for each of the unused vectors. */
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;
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EXPORT __tx_BadHandler
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__tx_BadHandler
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B __tx_BadHandler
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EXPORT __tx_SVCallHandler
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__tx_SVCallHandler
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B __tx_SVCallHandler
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EXPORT __tx_IntHandler
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__tx_IntHandler
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; VOID InterruptHandler (VOID)
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; {
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PUSH {r0, lr}
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; /* Do interrupt handler work here */
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; /* .... */
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POP {r0, lr}
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BX LR
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; }
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EXPORT __tx_SysTickHandler
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EXPORT SysTick_Handler
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__tx_SysTickHandler
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SysTick_Handler
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; VOID TimerInterruptHandler (VOID)
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; {
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;
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PUSH {r0, lr}
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BL _tx_timer_interrupt
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POP {r0, lr}
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BX LR
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; }
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EXPORT __tx_NMIHandler
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__tx_NMIHandler
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B __tx_NMIHandler
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EXPORT __tx_DBGHandler
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__tx_DBGHandler
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B __tx_DBGHandler
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ALIGN
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LTORG
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END
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