Replace unavailable flag-preserving instruction

It seems sub requires thumb2 instructions which are unavailable. This is in line with the rest of the sdk code base which uses subs.
This commit is contained in:
foopub 2021-02-26 01:42:11 +00:00 committed by graham sanderson
parent e371f6af60
commit 542b86e5db

View File

@ -79,7 +79,7 @@ bool clock_configure(enum clock_index clk_index, uint32_t src, uint32_t auxsrc,
uint delay_cyc = configured_freq[clk_sys] / configured_freq[clk_index] + 1;
asm volatile (
"1: \n\t"
"sub %0, #1 \n\t"
"subs %0, #1 \n\t"
"bne 1b"
: "+r" (delay_cyc)
);
@ -386,4 +386,4 @@ bool clock_configure_gpin(enum clock_index clk_index, uint gpio, uint32_t src_fr
// Now we have the src, auxsrc, and configured the gpio input
// call clock configure to run the clock from a gpio
return clock_configure(clk_index, src, auxsrc, src_freq, freq);
}
}