Hi, Expert!
I am going to create an application with a Timer. Following is how I define the interrupt handler in my code (tried both __interrupt keywords as well as the #pragma INTERRUPT" method, the results are the same - not working).
#if 1
#pragma INTERRUPT(IRQ_Handler, IRQ)
#endif
#if 0
__interrupt void IRQ_Handler(void)
#else
void IRQ_Handler(void)
#endif
{
switch((0xff & REG_IRQIVEC)-1)
{
case CIM_COMP1 : COMP1_irq_handler(); break;
}
}
After build, I got following disassembly code of the IRQ_Handler() code (a normal function call):
000029e0 <IRQ_Handler>:
29e0: e92d500f push {r0, r1, r2, r3, ip, lr}
29e4: ea000001 b 29f0 <IRQ_Handler+0x10>
29e8: ebfffe8b bl 241c <COMP1_irq_handler>
29ec: ea000006 b 2a0c <IRQ_Handler+0x2c>
29f0: e3e0c0df mvn ip, #223 ; 0xdf
29f4: e59cc000 ldr ip, [ip]
29f8: e20cc0ff and ip, ip, #255 ; 0xff
29fc: e24cc001 sub ip, ip, #1
2a00: e25cc002 subs ip, ip, #2
2a04: 0afffff7 beq 29e8 <IRQ_Handler+0x8>
2a08: eaffffff b 2a0c <IRQ_Handler+0x2c>
2a0c: e8bd500f pop {r0, r1, r2, r3, ip, lr}
2a10: e25ef004 subs pc, lr, #4
And my test failed. Since, the generated ISR is not appropriate.
I am expecting following ISR code (obtained from IAR's toolchain):
IRQ_Handler():
0000018c: E24EE004 SUB R14, R14, #0x4
00000190: E92D500F STMFD R13!, {R0-R3, R12, R14}
00000194: E3E000DF MVN R0, #0xDF
00000198: E5900000 LDR R0, [R0]
0000019c: E21000FF ANDS R0, R0, #0xFF
000001a0: E2500001 SUBS R0, R0, #0x1
000001a4: E3500002 CMP R0, #0x2
000001a8: 1A000000 BNE 0x000001B0
000001ac: EBFFFFA2 BL ?Veneer (0) for COMP1_irq_handler
000001b0: E8FD900F LDMFD R13!, {R0-R3, R12, PC}^
So, it seems that, compiler doesn't generate appropriate ISR code from c.
I have tried following compilers:
TI v15.12.2.LTS
TI v15.12.1.LTS
TI v5.2.5
My project configuration is: Generic ARM7 Device, EABI (ELF), BIG Endian, the RTSC library is rtsv4_A_be_eabi.lib
Regards!
Wen
