diff options
Diffstat (limited to 'libopna/opnassg.c')
| -rw-r--r-- | libopna/opnassg.c | 6 |
1 files changed, 4 insertions, 2 deletions
diff --git a/libopna/opnassg.c b/libopna/opnassg.c index 3c5b108..223758c 100644 --- a/libopna/opnassg.c +++ b/libopna/opnassg.c @@ -108,8 +108,10 @@ unsigned opna_ssg_readreg(const struct opna_ssg *ssg, unsigned reg) { return ssg->regs[reg]; } -static int opna_ssg_tone_period(const struct opna_ssg *ssg, int chan) { - return ssg->regs[0+chan*2] | ((ssg->regs[1+chan*2] & 0xf) << 8); +unsigned opna_ssg_tone_period(const struct opna_ssg *ssg, int ch) { + if (ch < 0) return 0; + if (ch >= 3) return 0; + return ssg->regs[0+ch*2] | ((ssg->regs[1+ch*2] & 0xf) << 8); } static bool opna_ssg_chan_env(const struct opna_ssg *ssg, int chan) { |