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fix host issue when mounting an CDC device without IAD

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hathach 2023-01-31 18:40:07 +07:00
parent b03a688b24
commit 95403ed9ac
1 changed files with 12 additions and 1 deletions
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13
src/host/usbh.c
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@ -1522,7 +1522,7 @@ static bool _parse_configuration_descriptor(uint8_t dev_addr, tusb_desc_configur
#if CFG_TUH_MIDI
// MIDI has 2 interfaces (Audio Control v1 + MIDIStreaming) but does not have IAD
// manually increase the associated count
// manually force associated count = 2
if (1 == assoc_itf_count &&
TUSB_CLASS_AUDIO == desc_itf->bInterfaceClass &&
AUDIO_SUBCLASS_CONTROL == desc_itf->bInterfaceSubClass &&
@ -1532,6 +1532,17 @@ static bool _parse_configuration_descriptor(uint8_t dev_addr, tusb_desc_configur
}
#endif
#if CFG_TUH_CDC
// Some legacy CDC device does not use IAD but rather use device class as hint to combine 2 interfaces
// manually force associated count = 2
if (1 == assoc_itf_count &&
TUSB_CLASS_CDC == desc_itf->bInterfaceClass &&
CDC_COMM_SUBCLASS_ABSTRACT_CONTROL_MODEL == desc_itf->bInterfaceSubClass)
{
assoc_itf_count = 2;
}
#endif
uint16_t const drv_len = tu_desc_get_interface_total_len(desc_itf, assoc_itf_count, (uint16_t) (desc_end-p_desc));
TU_ASSERT(drv_len >= sizeof(tusb_desc_interface_t));