Re: [ECOS] MPC860 Quick question

["Radu Cernea" <rc at unusus dot com>]

>> The difference is in the pin allocation for SMC2:
>>
>> - Port B21 & B20 for MPC860
>> - Port A9 & A8 for MPC850
>>
>> The current version of quicc_smc1.c initialize the port pins MPC850-like
>> (function cyg_hal_smcx_init_channel).
>>
>> My question is:
>> How is it better to add the MPC860 initialization version to the eCos sources?
>> Should I create a new file, use a conditional pre-compilation flag, or??
>
> What version of quicc_smc1.c are you looking at? There is supposed to be
complete
> support already in place for SMC1/SMC2 and SCC1/SCC2/SCC4.  If this is not the
> case, we need to fix it *there*, not add new code somewhere else.
Unfortunately I do not have CVS access (the IT department rules?), so I
download snapshots from ecoscentric. In the last one (031026), I?m looking at
the file:
/ecos/packages/hal/powerpc/quicc/current/src/quicc_smc1.c

There is support for SMC2, but the initialization is not the proper one for
MPC860. Instead of:
168:    eppc->pio_papar |= 0xc0;
169:    eppc->pio_padir &= ~0xc0;
170:    eppc->pio_paodr &= ~0xc0;

It should be something like:
    eppc->pip_pbpar |=   0x00000C00;
    eppc->pip_pbdir &= ~0x00000C00;
    eppc->pip_pbodr &= ~0x00000C00;

See, for the reference, the table 34-6 in MPC860UM.pdf

Regards,
Radu



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