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Add transaction (edpt_xact) as sub transfer

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A transfer can have one or multiple transactions.
Usually only EP0 splits one xfer into multiple xact.
This commit is contained in:
Jan Dümpelmann
2020-06-18 17:18:28 +02:00
parent 42edbc0006
commit 067287ef91
1 changed files with 49 additions and 48 deletions
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93
src/portable/st/synopsys/dcd_synopsys.c
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@@ -186,6 +186,40 @@ static void end_of_reset(void) {
}
}
static void edpt_xact(uint8_t const epnum, uint8_t const dir, uint16_t const num_packets, uint16_t total_bytes) {
USB_OTG_DeviceTypeDef * const dev = DEVICE_BASE;
USB_OTG_OUTEndpointTypeDef * const out_ep = OUT_EP_BASE;
USB_OTG_INEndpointTypeDef * const in_ep = IN_EP_BASE;
// EP0 is limited to one packet each xfer
// We use multiple transaction of xfer->max_size length to get a whole transfer done
if(epnum == 0) {
xfer_ctl_t * const xfer = XFER_CTL_BASE(epnum, dir);
total_bytes = tu_min16(ep0_pending[dir], xfer->max_size);
ep0_pending[dir] -= total_bytes;
}
// IN and OUT endpoint xfers are interrupt-driven, we just schedule them here.
if(dir == TUSB_DIR_IN) {
// A full IN transfer (multiple packets, possibly) triggers XFRC.
in_ep[epnum].DIEPTSIZ = (num_packets << USB_OTG_DIEPTSIZ_PKTCNT_Pos) |
((total_bytes << USB_OTG_DIEPTSIZ_XFRSIZ_Pos) & USB_OTG_DIEPTSIZ_XFRSIZ_Msk);
in_ep[epnum].DIEPCTL |= USB_OTG_DIEPCTL_EPENA | USB_OTG_DIEPCTL_CNAK;
// Enable fifo empty interrupt only if there are something to put in the fifo.
if(total_bytes != 0) {
dev->DIEPEMPMSK |= (1 << epnum);
}
} else {
// A full OUT transfer (multiple packets, possibly) triggers XFRC.
out_ep[epnum].DOEPTSIZ &= ~(USB_OTG_DOEPTSIZ_PKTCNT_Msk | USB_OTG_DOEPTSIZ_XFRSIZ);
out_ep[epnum].DOEPTSIZ |= (num_packets << USB_OTG_DOEPTSIZ_PKTCNT_Pos) |
((total_bytes << USB_OTG_DOEPTSIZ_XFRSIZ_Pos) & USB_OTG_DOEPTSIZ_XFRSIZ_Msk);
out_ep[epnum].DOEPCTL |= USB_OTG_DOEPCTL_EPENA | USB_OTG_DOEPCTL_CNAK;
}
}
/*------------------------------------------------------------------*/
/* Controller API
@@ -347,9 +381,6 @@ bool dcd_edpt_open (uint8_t rhport, tusb_desc_endpoint_t const * desc_edpt)
bool dcd_edpt_xfer (uint8_t rhport, uint8_t ep_addr, uint8_t * buffer, uint16_t total_bytes)
{
(void) rhport;
USB_OTG_DeviceTypeDef * dev = DEVICE_BASE;
USB_OTG_OUTEndpointTypeDef * out_ep = OUT_EP_BASE;
USB_OTG_INEndpointTypeDef * in_ep = IN_EP_BASE;
uint8_t const epnum = tu_edpt_number(ep_addr);
uint8_t const dir = tu_edpt_dir(ep_addr);
@@ -358,6 +389,14 @@ bool dcd_edpt_xfer (uint8_t rhport, uint8_t ep_addr, uint8_t * buffer, uint16_t
xfer->buffer = buffer;
xfer->total_len = total_bytes;
// EP0 can only handle one packet
if(epnum == 0) {
ep0_pending[dir] = total_bytes;
// Schedule the first transaction for EP0 transfer
edpt_xact(epnum, dir, 1, ep0_pending[dir]);
return true;
}
uint16_t num_packets = (total_bytes / xfer->max_size);
uint8_t const short_packet_size = total_bytes % xfer->max_size;
@@ -366,38 +405,8 @@ bool dcd_edpt_xfer (uint8_t rhport, uint8_t ep_addr, uint8_t * buffer, uint16_t
num_packets++;
}
// EP0 can only handle one packet
if(epnum == 0) {
num_packets = 1;
if(total_bytes > xfer->max_size) {
ep0_pending[dir] = total_bytes - xfer->max_size;
total_bytes = xfer->max_size;
// Decrement pointer to make EP0 buffers compatible with existing routines.
xfer->buffer -= ep0_pending[dir];
} else {
ep0_pending[dir] = 0;
}
}
// IN and OUT endpoint xfers are interrupt-driven, we just schedule them here.
if(dir == TUSB_DIR_IN) {
// A full IN transfer (multiple packets, possibly) triggers XFRC.
in_ep[epnum].DIEPTSIZ = (num_packets << USB_OTG_DIEPTSIZ_PKTCNT_Pos) |
((total_bytes & USB_OTG_DIEPTSIZ_XFRSIZ_Msk) << USB_OTG_DIEPTSIZ_XFRSIZ_Pos);
in_ep[epnum].DIEPCTL |= USB_OTG_DIEPCTL_EPENA | USB_OTG_DIEPCTL_CNAK;
// Enable fifo empty interrupt only if there are something to put in the fifo.
if(total_bytes != 0) {
dev->DIEPEMPMSK |= (1 << epnum);
}
} else {
// A full OUT transfer (multiple packets, possibly) triggers XFRC.
out_ep[epnum].DOEPTSIZ &= ~(USB_OTG_DOEPTSIZ_PKTCNT_Msk | USB_OTG_DOEPTSIZ_XFRSIZ);
out_ep[epnum].DOEPTSIZ |= (num_packets << USB_OTG_DOEPTSIZ_PKTCNT_Pos) |
((total_bytes << USB_OTG_DOEPTSIZ_XFRSIZ_Pos) & USB_OTG_DOEPTSIZ_XFRSIZ_Msk);
out_ep[epnum].DOEPCTL |= USB_OTG_DOEPCTL_EPENA | USB_OTG_DOEPCTL_CNAK;
}
// Schedule the transaction for endpoint transfer
edpt_xact(epnum, dir, num_packets, total_bytes);
return true;
}
@@ -614,12 +623,8 @@ static void handle_epout_ints(USB_OTG_DeviceTypeDef * dev, USB_OTG_OUTEndpointTy
// EP0 can only handle one packet
if((n == 0) && ep0_pending[TUSB_DIR_OUT]) {
uint16_t const total_bytes = tu_min16(ep0_pending[TUSB_DIR_OUT], xfer->max_size);
ep0_pending[TUSB_DIR_OUT] -= total_bytes;
// Schedule another packet to be received.
out_ep[0].DOEPTSIZ |= (1 << USB_OTG_DOEPTSIZ_PKTCNT_Pos) |
((total_bytes << USB_OTG_DOEPTSIZ_XFRSIZ_Pos) & USB_OTG_DOEPTSIZ_XFRSIZ_Msk);
out_ep[0].DOEPCTL |= USB_OTG_DOEPCTL_EPENA | USB_OTG_DOEPCTL_CNAK;
edpt_xact(n, TUSB_DIR_OUT, 1, ep0_pending[TUSB_DIR_OUT]);
} else {
dcd_event_xfer_complete(0, n, xfer->total_len, XFER_RESULT_SUCCESS, true);
}
@@ -645,12 +650,8 @@ static void handle_epin_ints(USB_OTG_DeviceTypeDef * dev, USB_OTG_INEndpointType
// EP0 can only handle one packet
if((n == 0) && ep0_pending[TUSB_DIR_IN]) {
uint16_t const total_bytes = tu_min16(ep0_pending[TUSB_DIR_IN], xfer->max_size);
ep0_pending[TUSB_DIR_IN] -= total_bytes;
// Schedule another packet to be received.
in_ep[0].DIEPTSIZ |= (1 << USB_OTG_DIEPTSIZ_PKTCNT_Pos) |
((total_bytes << USB_OTG_DIEPTSIZ_XFRSIZ_Pos) & USB_OTG_DIEPTSIZ_XFRSIZ_Msk);
in_ep[0].DIEPCTL |= USB_OTG_DIEPCTL_EPENA | USB_OTG_DIEPCTL_CNAK;
// Schedule another packet to be transmitted.
edpt_xact(n, TUSB_DIR_IN, 1, ep0_pending[TUSB_DIR_IN]);
} else {
dcd_event_xfer_complete(0, n | TUSB_DIR_IN_MASK, xfer->total_len, XFER_RESULT_SUCCESS, true);
}