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dcd(samd): implement iso alloc/activate

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Reserve the bank SIZE bucket once, re-enable per altsetting, and scrub the
bank-ready state so a stale armed bank cannot send before the class re-arms.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01HeF2gZ1M7GWkz6Av4BpKPg
This commit is contained in:
hathach
2026-07-09 23:38:18 +07:00
parent dfb53cb30c
commit 8ec71dca0d
1 changed files with 39 additions and 5 deletions
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44
src/portable/microchip/samd/dcd_samd.c
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@ -229,15 +229,49 @@ bool dcd_edpt_open (uint8_t rhport, tusb_desc_endpoint_t const * desc_edpt)
bool dcd_edpt_iso_alloc(uint8_t rhport, uint8_t ep_addr, uint16_t largest_packet_size) {
(void) rhport;
(void) ep_addr;
(void)largest_packet_size;
return false;
uint8_t const epnum = tu_edpt_number(ep_addr);
uint8_t const dir = tu_edpt_dir(ep_addr);
// Reserve the endpoint bank with the largest packet size (persists across altsettings). The
// buffer address/count are filled per-transfer in dcd_edpt_xfer; only the SIZE bucket is fixed.
UsbDeviceDescBank* bank = &sram_registers[epnum][dir];
uint32_t size_value = 0;
while (size_value < 7) {
if (1 << (size_value + 3) >= largest_packet_size) {
break;
}
size_value++;
}
if ( size_value == 7 && largest_packet_size > 1023 ) return false;
bank->PCKSIZE.bit.SIZE = size_value;
return true;
}
bool dcd_edpt_iso_activate(uint8_t rhport, const tusb_desc_endpoint_t *desc_ep) {
(void)rhport;
(void)desc_ep;
return false;
uint8_t const epnum = tu_edpt_number(desc_ep->bEndpointAddress);
uint8_t const dir = tu_edpt_dir(desc_ep->bEndpointAddress);
// Configure and enable the ISO endpoint on altsetting selection (bank SIZE already reserved by
// dcd_edpt_iso_alloc). Mirrors the per-direction setup in dcd_edpt_open(), plus a bank scrub:
// under ISO_ALLOC the EP is never disabled on alt0 (usbd_edpt_close is a no-op), so the bank-ready
// state from the previous streaming session survives into re-activation. Leave the EP un-armed so
// a stale bank can't move a packet before dcd_edpt_xfer re-arms it (a leftover BK1RDY with a stale
// BYTE_COUNT would otherwise babble on the first IN token after re-selecting alt1).
UsbDeviceEndpoint* ep = &USB->DEVICE.DeviceEndpoint[epnum];
if ( dir == TUSB_DIR_OUT ) {
ep->EPCFG.bit.EPTYPE0 = desc_ep->bmAttributes.xfer + 1;
ep->EPSTATUSCLR.reg = USB_DEVICE_EPSTATUSCLR_STALLRQ0 | USB_DEVICE_EPSTATUSCLR_DTGLOUT;
ep->EPSTATUSSET.reg = USB_DEVICE_EPSTATUSSET_BK0RDY; // OUT: not ready to receive until armed
ep->EPINTENSET.bit.TRCPT0 = true;
} else {
ep->EPCFG.bit.EPTYPE1 = desc_ep->bmAttributes.xfer + 1;
ep->EPSTATUSCLR.reg = USB_DEVICE_EPSTATUSCLR_STALLRQ1 | USB_DEVICE_EPSTATUSCLR_DTGLIN |
USB_DEVICE_EPSTATUSCLR_BK1RDY; // IN: clear stale "loaded" bank
ep->EPINTENSET.bit.TRCPT1 = true;
}
return true;
}
void dcd_edpt_close_all (uint8_t rhport)