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- 2021-4-10
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发表于 2020-7-6 18:19:25
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有这么夸张,楼主需要修改一下.s文件,增加对硬件浮点计算的处理,错误中断是由于硬件浮点使用后,不能正确跳转回ucos系统导致。下面代码加到对应的startup_stm32f40xx.c中。位置就是上下;后面指定的位置。
; Reset handler
Reset_Handler PROC
EXPORT Reset_Handler [WEAK]
IMPORT SystemInit
IMPORT __main
LDR R0, =SystemInit
BLX R0
IF {FPU} != "SoftVFP"
; Enable Floating Point Support at reset for FPU
LDR.W R0, =0xE000ED88 ; Load address of CPACR register
LDR R1, [R0] ; Read value at CPACR
ORR R1, R1, #(0xF <<20) ; Set bits 20-23 to enable CP10 and CP11 coprocessors
; Write back the modified CPACR value
STR R1, [R0] ; Wait for store to complete
DSB
; Disable automatic FP register content
; Disable lazy context switch
LDR.W R0, =0xE000EF34 ; Load address to FPCCR register
LDR R1, [R0]
AND R1, R1, #(0x3FFFFFFF) ; Clear the LSPEN and ASPEN bits
STR R1, [R0]
ISB ; Reset pipeline now the FPU is enabled
ENDIF
LDR R0, =__main
BX R0
ENDP
; Dummy Exception Handlers (infinite loops which can be modified) |
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