NOTE: This is a *solved* problem. I wrote this up as a question,
promptly followed by finding the answer. I'm posting anyway so others
might be able to find it on Google. As usual, the answer lay in RTFM.
I was running into an issue where if I had something like:
__xdata uint8_t nop[5] = { 0x04, 0x60, 0x00, 0x00, 0x00 };
Then I'd find the initial values in an XINIT section, were I assume
_mcs51_genXINIT() copies into the XISEG section on startup/reset. The
problem was that it wasn't being initialized when I halted the
processor and read out the XISEG addresses. But if I did this:
__xdata __at 0xe000 uint8_t nop[5] = { 0x04, 0x60, 0x00, 0x00, 0x00 };
Then the data was alright and my firmware ran as expected.
The solution was in the SDCC manual under 4.1.1 pdata access by SFR.
The Cypress EZ-USB FX2 chip needs to have _XPAGE defined to MPAGE (sfr
@ 0x92) as specified in EZ-USB Technical Reference Manual, version
1.4, 11.12 Special Function Registers (SFR).
As
--
- Tristan -
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