//* \brief This function Activates the USB device\r
//*----------------------------------------------------------------------------\r
void usb_enable() {\r
- // Set the PLL USB Divider\r
- AT91C_BASE_CKGR->CKGR_PLLR |= AT91C_CKGR_USBDIV_1 ;\r
- \r
- // Specific Chip USB Initialisation\r
- // Enables the 48MHz USB clock UDPCK and System Peripheral USB Clock\r
- AT91C_BASE_PMC->PMC_SCER = AT91C_PMC_UDP;\r
- AT91C_BASE_PMC->PMC_PCER = (1 << AT91C_ID_UDP);\r
- \r
- // Enable UDP PullUp (USB_DP_PUP) : enable & Clear of the corresponding PIO\r
- // Set in PIO mode and Configure in Output\r
- AT91C_BASE_PIOA->PIO_PER = GPIO_USB_PU; // Set in PIO mode\r
+ // Set the PLL USB Divider\r
+ AT91C_BASE_CKGR->CKGR_PLLR |= AT91C_CKGR_USBDIV_1 ;\r
+\r
+ // Specific Chip USB Initialisation\r
+ // Enables the 48MHz USB clock UDPCK and System Peripheral USB Clock\r
+ AT91C_BASE_PMC->PMC_SCER = AT91C_PMC_UDP;\r
+ AT91C_BASE_PMC->PMC_PCER = (1 << AT91C_ID_UDP);\r
+\r
+ // Enable UDP PullUp (USB_DP_PUP) : enable & Clear of the corresponding PIO\r
+ // Set in PIO mode and Configure in Output\r
+ AT91C_BASE_PIOA->PIO_PER = GPIO_USB_PU; // Set in PIO mode\r
AT91C_BASE_PIOA->PIO_OER = GPIO_USB_PU; // Configure as Output\r
- \r
- // Clear for set the Pullup resistor\r
+\r
+ // Clear for set the Pullup resistor\r
AT91C_BASE_PIOA->PIO_CODR = GPIO_USB_PU;\r
- \r
- // Disconnect and reconnect USB controller for 100ms\r
- usb_disable();\r
- \r
- // Wait for a short while\r
- for (volatile size_t i=0; i<0x100000; i++);\r
\r
- // Reconnect USB reconnect\r
- AT91C_BASE_PIOA->PIO_SODR = GPIO_USB_PU;\r
- AT91C_BASE_PIOA->PIO_OER = GPIO_USB_PU;\r
+ // Disconnect and reconnect USB controller for 100ms\r
+ usb_disable();\r
+\r
+ // Wait for a short while\r
+ for (volatile size_t i=0; i<0x100000; i++);\r
+ //sleep(1);\r
+ \r
+ // Reconnect USB reconnect\r
+ AT91C_BASE_PIOA->PIO_SODR = GPIO_USB_PU;\r
+ AT91C_BASE_PIOA->PIO_OER = GPIO_USB_PU;\r
}\r
\r
//*----------------------------------------------------------------------------\r
return (pUdp->UDP_CSR[AT91C_EP_OUT] & btReceiveBank);\r
}\r
\r
+/**\r
+ In github PR #129, some users appears to get a false positive from\r
+ usb_poll, which returns true, but the usb_read operation\r
+ still returns 0.\r
+ This check is basically the same as above, but also checks\r
+ that the length available to read is non-zero, thus hopefully fixes the\r
+ bug.\r
+**/\r
+bool usb_poll_validate_length()\r
+{\r
+\r
+ if (!usb_check()) return false;\r
+ if (!(pUdp->UDP_CSR[AT91C_EP_OUT] & btReceiveBank)) return false;\r
+ return (pUdp->UDP_CSR[AT91C_EP_OUT] >> 16) > 0;\r
+}\r
+\r
//*----------------------------------------------------------------------------\r
//* \fn usb_read\r
//* \brief Read available data from Endpoint OUT\r