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nuc121: enhanced driver and hopefully added readability

This commit is contained in:
Peter Lawrence 2020-01-15 20:09:50 -06:00
parent 906471a487
commit c04bc07c29
1 changed files with 18 additions and 10 deletions
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28
src/portable/nuvoton/nuc121/dcd_nuc121.c
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@ -77,8 +77,11 @@ static bool active_ep0_xfer;
/* RAM table needed to track ongoing transfers performed by dcd_edpt_xfer(), dcd_in_xfer(), and the ISR */ /* RAM table needed to track ongoing transfers performed by dcd_edpt_xfer(), dcd_in_xfer(), and the ISR */
static struct xfer_ctl_t static struct xfer_ctl_t
{ {
uint8_t *data_ptr; /* collectively, data_ptr and remaining_bytes track progress of endpoint transfers */ uint8_t *data_ptr; /* data_ptr tracks where to next copy data to (for OUT) or from (for IN) */
uint16_t remaining_bytes; union {
uint16_t in_remaining_bytes; /* for IN endpoints, we track how many bytes are left to transfer */
uint16_t out_bytes_so_far; /* but for OUT endpoints, we track how many bytes we've transferred so far */
};
uint16_t max_packet_size; /* needed since device driver only finds out this at runtime */ uint16_t max_packet_size; /* needed since device driver only finds out this at runtime */
uint16_t total_bytes; /* quantity needed to pass as argument to dcd_event_xfer_complete() (for IN endpoints) */ uint16_t total_bytes; /* quantity needed to pass as argument to dcd_event_xfer_complete() (for IN endpoints) */
} xfer_table[PERIPH_MAX_EP]; } xfer_table[PERIPH_MAX_EP];
@ -139,7 +142,7 @@ static USBD_EP_T *ep_entry(uint8_t ep_addr, bool add)
/* perform an IN endpoint transfer; this is called by dcd_edpt_xfer() and the ISR */ /* perform an IN endpoint transfer; this is called by dcd_edpt_xfer() and the ISR */
static void dcd_in_xfer(struct xfer_ctl_t *xfer, USBD_EP_T *ep) static void dcd_in_xfer(struct xfer_ctl_t *xfer, USBD_EP_T *ep)
{ {
uint16_t bytes_now = tu_min16(xfer->remaining_bytes, xfer->max_packet_size); uint16_t bytes_now = tu_min16(xfer->in_remaining_bytes, xfer->max_packet_size);
memcpy((uint8_t *)(USBD_BUF_BASE + ep->BUFSEG), xfer->data_ptr, bytes_now); memcpy((uint8_t *)(USBD_BUF_BASE + ep->BUFSEG), xfer->data_ptr, bytes_now);
ep->MXPLD = bytes_now; ep->MXPLD = bytes_now;
@ -263,16 +266,21 @@ bool dcd_edpt_xfer(uint8_t rhport, uint8_t ep_addr, uint8_t *buffer, uint16_t to
/* store away the information we'll needing now and later */ /* store away the information we'll needing now and later */
xfer->data_ptr = buffer; xfer->data_ptr = buffer;
xfer->remaining_bytes = total_bytes; xfer->in_remaining_bytes = total_bytes;
xfer->total_bytes = total_bytes; xfer->total_bytes = total_bytes;
/* for the first of one or more EP0_IN packets in a message, the first must be DATA1 */ /* for the first of one or more EP0_IN packets in a message, the first must be DATA1 */
if ( (0x80 == ep_addr) && !active_ep0_xfer ) ep->CFG |= USBD_CFG_DSQSYNC_Msk; if ( (0x80 == ep_addr) && !active_ep0_xfer ) ep->CFG |= USBD_CFG_DSQSYNC_Msk;
if (TUSB_DIR_IN == dir) if (TUSB_DIR_IN == dir)
{
dcd_in_xfer(xfer, ep); dcd_in_xfer(xfer, ep);
}
else else
{
xfer->out_bytes_so_far = 0;
ep->MXPLD = xfer->max_packet_size; ep->MXPLD = xfer->max_packet_size;
}
return true; return true;
} }
@ -392,23 +400,23 @@ void USBD_IRQHandler(void)
{ {
/* copy the data from the PC to the previously provided buffer */ /* copy the data from the PC to the previously provided buffer */
memcpy(xfer->data_ptr, (uint8_t *)(USBD_BUF_BASE + ep->BUFSEG), available_bytes); memcpy(xfer->data_ptr, (uint8_t *)(USBD_BUF_BASE + ep->BUFSEG), available_bytes);
xfer->remaining_bytes -= available_bytes; xfer->out_bytes_so_far += available_bytes;
xfer->data_ptr += available_bytes; xfer->data_ptr += available_bytes;
/* when the transfer is finished, alert TinyUSB; otherwise, accept more data */ /* when the transfer is finished, alert TinyUSB; otherwise, accept more data */
if ( (0 == xfer->remaining_bytes) || (available_bytes < xfer->max_packet_size) ) if ( (xfer->total_bytes == xfer->out_bytes_so_far) || (available_bytes < xfer->max_packet_size) )
dcd_event_xfer_complete(0, ep_addr, xfer->total_bytes, XFER_RESULT_SUCCESS, true); dcd_event_xfer_complete(0, ep_addr, xfer->out_bytes_so_far, XFER_RESULT_SUCCESS, true);
else if (xfer->remaining_bytes) else
ep->MXPLD = xfer->max_packet_size; ep->MXPLD = xfer->max_packet_size;
} }
else else
{ {
/* update the bookkeeping to reflect the data that has now been sent to the PC */ /* update the bookkeeping to reflect the data that has now been sent to the PC */
xfer->remaining_bytes -= available_bytes; xfer->in_remaining_bytes -= available_bytes;
xfer->data_ptr += available_bytes; xfer->data_ptr += available_bytes;
/* if more data to send, send it; otherwise, alert TinyUSB that we've finished */ /* if more data to send, send it; otherwise, alert TinyUSB that we've finished */
if (xfer->remaining_bytes) if (xfer->in_remaining_bytes)
dcd_in_xfer(xfer, ep); dcd_in_xfer(xfer, ep);
else else
dcd_event_xfer_complete(0, ep_addr, xfer->total_bytes, XFER_RESULT_SUCCESS, true); dcd_event_xfer_complete(0, ep_addr, xfer->total_bytes, XFER_RESULT_SUCCESS, true);