diff options
Diffstat (limited to 'src')
| -rw-r--r-- | src/class/audio/audio_host.c | 11 |
1 files changed, 4 insertions, 7 deletions
diff --git a/src/class/audio/audio_host.c b/src/class/audio/audio_host.c index c29db658c..571680885 100644 --- a/src/class/audio/audio_host.c +++ b/src/class/audio/audio_host.c @@ -237,14 +237,11 @@ static bool audioh_format_from_uac1(uint8_t subframe_size, uint8_t bit_resolutio return true; } -// Endpoint poll interval in microseconds: full-speed bInterval is in 1 ms -// frames, high-speed isochronous bInterval is a power-of-2 exponent of -// 125 us microframes +// Isochronous bInterval is a power-of-2 exponent in 1 ms full-speed frames +// or 125 us high-speed microframes. static uint32_t audioh_interval_us(uint8_t ep_interval, uint8_t daddr) { - if (tuh_speed_get(daddr) == TUSB_SPEED_HIGH) { - return ((uint32_t)1u << (ep_interval - 1)) * 125u; - } - return (uint32_t)ep_interval * 1000u; + const uint32_t unit_us = (tuh_speed_get(daddr) == TUSB_SPEED_HIGH) ? 125u : 1000u; + return ((uint32_t)1u << (ep_interval - 1)) * unit_us; } // UAC 1.0 feature-unit control value width (0 = unsupported variable/unknown width) |