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Use ping-pong mode from the start of usb_write()

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Before:
708608,708608,707584,707584,708608->708198.4 bytes/s
After:
722944,733184,732160,731136,733184->730521.6 bytes/s

Added some note for ping-pong mode and non ping-pong mode
This commit is contained in:
wh201906
2023-10-24 12:31:41 +08:00
parent 96dc4be112
commit a0af1fa085
1 changed files with 5 additions and 3 deletions
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common_arm/usb_cdc.c
+5 -3
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@@ -777,7 +777,7 @@ int usb_write(const uint8_t *data, const size_t len) {
}
UDP_SET_EP_FLAGS(AT91C_EP_IN, AT91C_UDP_TXPKTRDY);
while (pUdp->UDP_CSR[AT91C_EP_IN] & AT91C_UDP_TXPKTRDY) {};
while (!(pUdp->UDP_CSR[AT91C_EP_IN] & AT91C_UDP_TXPKTRDY)) {};
while (length) {
// Send next chunk
@@ -810,9 +810,9 @@ int usb_write(const uint8_t *data, const size_t len) {
if (len % AT91C_EP_IN_SIZE == 0) {
// like AT91F_USB_SendZlp(), in non ping-pong mode
UDP_SET_EP_FLAGS(AT91C_EP_IN, AT91C_UDP_TXPKTRDY);
while (!(pUdp->UDP_CSR[AT91C_EP_IN] & AT91C_UDP_TXPKTRDY)) {};
while (!(pUdp->UDP_CSR[AT91C_EP_IN] & AT91C_UDP_TXCOMP)) {};
UDP_CLEAR_EP_FLAGS(AT91C_EP_IN, AT91C_UDP_TXCOMP);
while (pUdp->UDP_CSR[AT91C_EP_IN] & AT91C_UDP_TXCOMP) {};
@@ -869,6 +869,8 @@ void AT91F_USB_SendData(AT91PS_UDP pudp, const char *pData, uint32_t length) {
//*----------------------------------------------------------------------------
void AT91F_USB_SendZlp(AT91PS_UDP pudp) {
UDP_SET_EP_FLAGS(AT91C_EP_CONTROL, AT91C_UDP_TXPKTRDY);
// for non ping-pong operation, wait until the FIFO is released
// the flag for FIFO released is AT91C_UDP_TXCOMP rather than AT91C_UDP_TXPKTRDY
while (!(pudp->UDP_CSR[AT91C_EP_CONTROL] & AT91C_UDP_TXCOMP)) {};
UDP_CLEAR_EP_FLAGS(AT91C_EP_CONTROL, AT91C_UDP_TXCOMP);
while (pudp->UDP_CSR[AT91C_EP_CONTROL] & AT91C_UDP_TXCOMP) {};