diff options
Diffstat (limited to 'firmware/src')
| -rw-r--r-- | firmware/src/simtrace/iso7816_uart.c | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/firmware/src/simtrace/iso7816_uart.c b/firmware/src/simtrace/iso7816_uart.c index 4169ab9..5f1bad0 100644 --- a/firmware/src/simtrace/iso7816_uart.c +++ b/firmware/src/simtrace/iso7816_uart.c @@ -157,6 +157,8 @@ static int compute_fidi_ratio(u_int8_t fi, u_int8_t di) if (d == 0) return -EINVAL; + /* See table 7 of ISO 7816-3: From 1000 on we divide by 1/d, + * which equals a multiplication by d */ if (di < 8) ret = f / d; else |