diff options
Diffstat (limited to 'example-cdc/sample.c')
| -rw-r--r-- | example-cdc/sample.c | 21 |
1 files changed, 14 insertions, 7 deletions
diff --git a/example-cdc/sample.c b/example-cdc/sample.c index ee6d23f..9b9a4a6 100644 --- a/example-cdc/sample.c +++ b/example-cdc/sample.c @@ -65,24 +65,31 @@ usb_intr (void *arg) chopstx_intr_t interrupt; (void)arg; - usb_lld_init (0x80); /* Bus powered. */ - chopstx_claim_irq (&interrupt, INTR_REQ_USB); - +#if defined(OLDER_SYS_H) /* + * Historically (before sys < 3.0), NVIC priority setting for USB + * interrupt was done in usb_lld_sys_init. Thus this code. + * * When USB interrupt occurs between usb_lld_init (which assumes * ISR) and chopstx_claim_irq (which clears pending interrupt), * invocation of usb_interrupt_handler won't occur. * - * We can't call usb_lld_init after chopstx_claim_irq, as - * usb_lld_init does its own setting for NVIC. Calling - * chopstx_claim_irq after usb_lld_init overrides that. - * * Calling usb_interrupt_handler is no harm even if there were no * interrupts, thus, we call it unconditionally here, just in case * if there is a request. * + * We can't call usb_lld_init after chopstx_claim_irq, as + * usb_lld_init does its own setting for NVIC. Calling + * chopstx_claim_irq after usb_lld_init overrides that. + * */ + usb_lld_init (0x80); /* Bus powered. */ + chopstx_claim_irq (&interrupt, INTR_REQ_USB); usb_interrupt_handler (); +#else + chopstx_claim_irq (&interrupt, INTR_REQ_USB); + usb_lld_init (0x80); /* Bus powered. */ +#endif while (1) { |