Hi all
I stumbled across this code in spi-bitbang.c:
list_for_each_entry (t, &m->transfers, transfer_list) {
...
cs_change = t->cs_change;
...
if (!cs_change)
continue;
...
/* sometimes a short mid-message deselect of the chip
* may be needed to terminate a mode or command
*/
ndelay(nsecs);
bitbang->chipselect(spi, BITBANG_CS_INACTIVE);
ndelay(nsecs);
}
...
/* normally deactivate chipselect ... unless no error and
* cs_change has hinted that the next message will probably
* be for this chip too.
*/
if (!(status == 0 && cs_change)) {
ndelay(nsecs);
bitbang->chipselect(spi, BITBANG_CS_INACTIVE);
ndelay(nsecs);
}
So, IIUC, on the first occurrance cs_change is interpreted as "true ==
have to disable CD," whereas the second one does the opposite. Shouldn't
the latter one be inverted?
Thanks
Guennadi
---
Guennadi Liakhovetski, Ph.D.
Freelance Open-Source Software Developer
http://www.open-technology.de/
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