I have no problems with normal interrupts (irqs) but cannot get fast interrupt (fiq) working. I am using the assembler wrapper code found in the "MIPS" example. Looking at the wrapper code for fiq (FIQ_Handler_Entry), I am wondering if it is complete : is it not supposed to save the LR_fiq in fiq stack at the begining? Has anybody tested successfully this wrapper ? Thanks. Michel
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Michel Boulanger wrote: > I have no problems with normal interrupts (irqs) but cannot get fast > interrupt (fiq) working. I am using the assembler wrapper code found in > the "MIPS" example. Looking at the wrapper code for fiq > (FIQ_Handler_Entry), I am wondering if it is complete : is it not > supposed to save the LR_fiq in fiq stack at the begining? > > Has anybody tested successfully this wrapper ? I don't think the wrapper itself does cause the problem. I have not used ARM7 FIQ so far since I did not need it in a project -> I have not tested the wrapper. But the wrapper seems to handle the "banked" LR correctly and the LR is also "saved" on the stack before the wrapper calls the user-function. You may check the stack-setup startup assembler-code. The startup-code based on examples from Atmel do not include the "MOV SP,..." for the FIQ stack-setup. The instructions used for the other stack initialisations can serve as templates for the FIQ stack-setup Martin Thomas