Lpc2000

Robert Adsett wrote:

>At 11:36 PM 1/22/06 -0500, Tom Walsh wrote:
>  
>
>>I dunno, mine works and I didn't bother with ASM:
>>
>>======== begin C call to ID ============
>>
>>#define  IAP_LOCATION            0x7ffffff1
>>
>>typedef void (*IAP)(unsigned int [],unsigned int[]);
>>unsigned int command_iap[5], result_iap[3];
>>IAP   iap_entry;
>>
>>
>>static int iapCommand (iap_calls_t command, int parm1, int parm2, int parm3)
>>{ // execute ISP similar command via IAP calls.
>>   iap_entry = (IAP) IAP_LOCATION;
>>   switch (command) {
>>....
>>....
>>      case IAP_READ_PART_ID:
>>         command_iap [0] = 54;
>>         disableIRQ(); iap_entry(command_iap,result_iap); enableIRQ();
>>    
>>
>
>That only works if the compiler uses a bx to call iap_entry.  Not all do 
>and there is AFAIK nothing that would require a compiler to (keep) doing so.
>
>  
>
Yes, and having a JTAG unit is a good thing!  :-)

TomW

-- 
Tom Walsh - WN3L - Embedded Systems Consultant
http://openhardware.net, http://cyberiansoftware.com
"Windows? No thanks, I have work to do..."
----------------------------------------------------