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| Micro Controllers Discuss all aspects of micro controllers - building them, coding them, etc. All controllers are welcome - PIC, BASIC, Z8 Encore!, etc. |
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19th February 2004, 04:25 AM
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 how to do case select in ASM?? in c, we have if or case select to select different cases... but how can we do it in assembly? especially for the PIC programming? can anyone give me some suggestion? thx... | |
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19th February 2004, 07:05 AM
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| Re: how to do case select in ASM?? Quote:
I'm presuming you are talking about the 4 bit A2D result you asked about in another thread, if so there's an easier and faster way to do it. As you have only 16 possible results (with 4 bits) you could use a jump table. This works exactly like a lookup table, except instead of RETLW lines it uses GOTO's instead. | ||
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19th February 2004, 06:00 PM
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| Instead of subtraction, you can also use XOR function to test if variable = constant expression.
__________________ "There is no way to peace, peace is the way!" | |
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19th February 2004, 11:17 PM
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| Here's a PIC16 code sample: Code: ; On entry, W reg contains the switch value ; SWITCH: movwf TEMP ; Save to a temporary register ; movlw CASE1_VAL subwf TEMP,W skpnz goto CASE1 ; movlw CASE2_VAL subwf TEMP,W skpnz goto CASE2 ; return CASE1: return CASE2: return
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