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usbuart: Don't try to send until configured. Enumeration may hang else

This commit is contained in:
Uwe Bonnes 2013-02-15 17:55:36 +01:00
parent dee82a0d4f
commit ff8de39774
1 changed files with 6 additions and 0 deletions
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6
src/platforms/stm32/usbuart.c
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@ -126,6 +126,12 @@ void USBUSART_ISR(void)
{ {
char c = usart_recv(USBUSART); char c = usart_recv(USBUSART);
/* Don't try to write until we are configured.
* Otherwise enumeration hanged in some cases.
*/
if (cdcacm_get_config() != 1)
return;
gpio_set(LED_PORT_UART, LED_UART); gpio_set(LED_PORT_UART, LED_UART);
/* Try to send now */ /* Try to send now */