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fix(usb/host): Correctly parse bInterval field in HighSpeed EP descriptors

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For LS and FS interrupt endpoint: interval = bInterval
For isochronous and HS interrupt endpoint: interval = 2^(bInterval-1)
This commit is contained in:
Tomas Rezucha
2023-12-06 18:05:41 +01:00
committed by Darian Leung
parent 0ce4aa114e
commit 1e2c271bd0
3 changed files with 21 additions and 34 deletions
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40
components/usb/hcd_dwc.c
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@@ -1578,31 +1578,31 @@ static void pipe_set_ep_char(const hcd_pipe_config_t *pipe_config, usb_transfer_
// Calculate the pipe's interval in terms of USB frames
// @see USB-OTG programming guide chapter 6.5 for more information
if (type == USB_TRANSFER_TYPE_INTR || type == USB_TRANSFER_TYPE_ISOCHRONOUS) {
unsigned int interval_frames;
unsigned int xfer_list_len;
if (type == USB_TRANSFER_TYPE_INTR) {
interval_frames = pipe_config->ep_desc->bInterval;
xfer_list_len = XFER_LIST_LEN_INTR;
// Convert bInterval field to real value
// @see USB 2.0 specs, Table 9-13
unsigned int interval_value;
if (type == USB_TRANSFER_TYPE_INTR && pipe_config->dev_speed != USB_SPEED_HIGH) {
interval_value = pipe_config->ep_desc->bInterval;
} else {
interval_frames = (1 << (pipe_config->ep_desc->bInterval - 1));
xfer_list_len = XFER_LIST_LEN_ISOC;
interval_value = (1 << (pipe_config->ep_desc->bInterval - 1));
}
// Round down interval to nearest power of 2
if (interval_frames >= 32) {
interval_frames = 32;
} else if (interval_frames >= 16) {
interval_frames = 16;
} else if (interval_frames >= 8) {
interval_frames = 8;
} else if (interval_frames >= 4) {
interval_frames = 4;
} else if (interval_frames >= 2) {
interval_frames = 2;
} else if (interval_frames >= 1) {
interval_frames = 1;
if (interval_value >= 32) {
interval_value = 32;
} else if (interval_value >= 16) {
interval_value = 16;
} else if (interval_value >= 8) {
interval_value = 8;
} else if (interval_value >= 4) {
interval_value = 4;
} else if (interval_value >= 2) {
interval_value = 2;
} else if (interval_value >= 1) {
interval_value = 1;
}
ep_char->periodic.interval = interval_frames;
ep_char->periodic.interval = interval_value;
// We are the Nth pipe to be allocated. Use N as a phase offset
unsigned int xfer_list_len = (type == USB_TRANSFER_TYPE_INTR) ? XFER_LIST_LEN_INTR : XFER_LIST_LEN_ISOC;
ep_char->periodic.phase_offset_frames = pipe_idx & (xfer_list_len - 1);
} else {
ep_char->periodic.interval = 0;