Hi, I am trying to get two CDC working on SAMG55.
The CDC device example from ASF3 works fine with single CDC, but when I change UDI_CDC_PORT_NB to 2 not even one CDC works.
I modified CDC callbacks to "multi" type, and added a simple echo (working fine when UDI_CDC_PORT_NB = 2).
BTW, I don't need a to a physical UART
void uart_rx_notify(uint8_t port)
{
UNUSED(port);
LED_Toggle(LED0);
if (udi_cdc_multi_is_rx_ready(port))
{
int c = udi_cdc_multi_getc(port);
if (udi_cdc_multi_is_tx_ready(port)){
udi_cdc_multi_putc(port, c);
}
}
// If UART is open
// if (usart_get_interrupt_mask(USART_BASE)
// & US_IMR_RXRDY) {
// // Enable UART TX interrupt to send a new value
// usart_enable_tx(USART_BASE);
// usart_enable_interrupt(USART_BASE, US_IER_TXRDY);
// }
}
USB configuration from udi_cdc_conf.h:
/**
* \name Default endpoint configuration
* The USBB, UDP, UDPHS and UOTGHS interfaces can support up to 2 CDC interfaces.
*/
//@{
# if UDI_CDC_PORT_NB > 2
# error USBB, UDP, UDPHS and UOTGHS interfaces have not enought endpoints.
# endif
#define UDI_CDC_DATA_EP_IN_0 (1 | USB_EP_DIR_IN) // TX
#define UDI_CDC_DATA_EP_OUT_0 (2 | USB_EP_DIR_OUT) // RX
#define UDI_CDC_COMM_EP_0 (3 | USB_EP_DIR_IN) // Notify endpoint
# if SAM3U
/* For 3U max endpoint size of 4 is 64, use 5 and 6 as bulk tx and rx */
# define UDI_CDC_DATA_EP_IN_1 (6 | USB_EP_DIR_IN) // TX
# define UDI_CDC_DATA_EP_OUT_1 (5 | USB_EP_DIR_OUT) // RX
# define UDI_CDC_COMM_EP_1 (4 | USB_EP_DIR_IN) // Notify
# else
# define UDI_CDC_DATA_EP_IN_1 (4 | USB_EP_DIR_IN) // TX
# define UDI_CDC_DATA_EP_OUT_1 (5 | USB_EP_DIR_OUT) // RX
# define UDI_CDC_COMM_EP_1 (6 | USB_EP_DIR_IN) // Notify
# endif
//! 3 endpoints used per CDC interface
#undef USB_DEVICE_MAX_EP // undefine this definition in header file
#define USB_DEVICE_MAX_EP (3*UDI_CDC_PORT_NB)
//@}
I found that the udi_cdc_comm_enable() is called only once, so only one CDC instance is initialized, but can't trace it back.
Can anyone help and point me in the right direction ?
