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Fix some wrong synchronization waits in usb_write()

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To make the full use of the ping-pong endpoint
Transfer speed before this fix:
616448,618496,618496,615424,615424->616857.6 bytes/s
Transfer speed after this fix:
707584,709632,707584,709632,710656->709017.6 bytes/s (+14.9%)
Tested by running hw status
This commit is contained in:
wh201906 2023-10-24 00:46:28 +08:00
parent e20742dd04
commit 72da0c9623
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1 changed files with 2 additions and 2 deletions
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4
common_arm/usb_cdc.c
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@ -797,7 +797,7 @@ int usb_write(const uint8_t *data, const size_t len) {
while (pUdp->UDP_CSR[AT91C_EP_IN] & AT91C_UDP_TXCOMP) {}; while (pUdp->UDP_CSR[AT91C_EP_IN] & AT91C_UDP_TXCOMP) {};
UDP_SET_EP_FLAGS(AT91C_EP_IN, AT91C_UDP_TXPKTRDY); 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)) {};
} }
// Wait for the end of transfer // Wait for the end of transfer
@ -812,7 +812,7 @@ int usb_write(const uint8_t *data, const size_t len) {
if (len % AT91C_EP_IN_SIZE == 0) { if (len % AT91C_EP_IN_SIZE == 0) {
UDP_SET_EP_FLAGS(AT91C_EP_IN, AT91C_UDP_TXPKTRDY); UDP_SET_EP_FLAGS(AT91C_EP_IN, AT91C_UDP_TXPKTRDY);
while (!(pUdp->UDP_CSR[AT91C_EP_IN] & AT91C_UDP_TXCOMP)) {}; while (!(pUdp->UDP_CSR[AT91C_EP_IN] & AT91C_UDP_TXPKTRDY)) {};
UDP_CLEAR_EP_FLAGS(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) {}; while (pUdp->UDP_CSR[AT91C_EP_IN] & AT91C_UDP_TXCOMP) {};