constant是一个8位立即数。ARM文档对于constant的介绍如下: constant is an 8-bit pattern rotated by an even number of bits within a 32-bit word. (Not available in Thumb.) Rm是源寄存器。 fields由下面的一个或者多个组合而成: c:xPSR[7:0],控制位域; x:xPSR[15:8],扩展位域; s:xPSR[23:16...
ARM中的程序状态寄存器(CPSR)31302928272676543210N Z C V Q DNM(RAZ) I F T M4 M3 M2 M1 M0| | | |___ Overflow : (Signed) Overflow/Underflow : The V flag works the sameasthe C flag, butforsigned operations.| | |the result of which will not fit into a 32bit destination register.|...
ARM v7-A and ARM v7-R Reference: ARM ® Architecture Reference Manual(ARM ® v7-A and ARM ® v7-R edition) Chapter B1, The System Level Programmers’ Model B1.3 ARM processor modes and core registers B1.3.3 Program Status Registers (PSRs) The format of the CPSR and SPSRs is: |...
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Also, if you take a look at this Processor SDK RTOS exampleC:\ti\pdk_am335x_1_0_6\packages\MyExampleProjects\UART_BasicExample_Dma_evmAM335x_armTestProject This enables interrupts and shows an implementation that should help getting it to work. ...