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ChibiOS
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git-svn-id: svn://svn.code.sf.net/p/chibios/svn/trunk@4275 35acf78f-673a-0410-8e92-d51de3d6d3f4

This commit is contained in:
gdisirio 2012-06-13 18:32:03 +00:00
parent 25d731ed0b
commit 18cab5548c
1 changed files with 25 additions and 17 deletions
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18
os/hal/platforms/STM32/OTGv1/usb_lld.c
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@ -301,7 +301,10 @@ static void otg_fifo_write_from_queue(usbep_t ep,
ntogo = n;
while (ntogo > 0) {
uint32_t dw, i;
size_t streak, nw = ntogo / 4;
size_t nw = ntogo / 4;
if (nw > 0) {
size_t streak;
uint32_t nw2end = (oqp->q_top - oqp->q_rdptr) / 4;
ntogo -= (streak = nw <= nw2end ? nw : nw2end) * 4;
@ -310,9 +313,10 @@ static void otg_fifo_write_from_queue(usbep_t ep,
oqp->q_rdptr = oqp->q_buffer;
continue;
}
}
/* If this condition is not satisfied then there is a word lying across
queue circular buffer boundary.*/
queue circular buffer boundary or there is a residual of data.*/
if (ntogo <= 0)
break;
@ -407,7 +411,10 @@ static void otg_fifo_read_to_queue(InputQueue *iqp, size_t n) {
ntogo = n;
while (ntogo > 0) {
uint32_t dw, i;
size_t streak, nw = ntogo / 4;
size_t nw = ntogo / 4;
if (nw > 0) {
size_t streak;
uint32_t nw2end = (iqp->q_wrptr - iqp->q_wrptr) / 4;
ntogo -= (streak = nw <= nw2end ? nw : nw2end) * 4;
@ -416,9 +423,10 @@ static void otg_fifo_read_to_queue(InputQueue *iqp, size_t n) {
iqp->q_wrptr = iqp->q_buffer;
continue;
}
}
/* If this condition is not satisfied then there is a word lying across
queue circular buffer boundary.*/
queue circular buffer boundary or there is a residual of data.*/
if (ntogo <= 0)
break;
@ -426,7 +434,7 @@ static void otg_fifo_read_to_queue(InputQueue *iqp, size_t n) {
dw = *fifop;
i = 0;
while ((ntogo > 0) && (i < 4)) {
*iqp->q_wrptr++ = (uint8_t)dw >> (i * 8);
*iqp->q_wrptr++ = (uint8_t)(dw >> (i * 8));
if (iqp->q_wrptr >= iqp->q_top)
iqp->q_wrptr = iqp->q_buffer;
ntogo--;