diff options
| author | NIIBE Yutaka <gniibe@fsij.org> | 2013-06-19 09:14:40 +0900 |
|---|---|---|
| committer | NIIBE Yutaka <gniibe@fsij.org> | 2013-06-19 09:14:40 +0900 |
| commit | b65635756347245c8ea52e9ba2b6f1576834140b (patch) | |
| tree | 755bbed2cc99967a5205721ea8af93aa7611596e /example-cdc | |
| parent | 7f2415f3a2c7aa49468d8f9195f3d31c5653b769 (diff) | |
fix example-cdc/sample.c
Diffstat (limited to 'example-cdc')
| -rw-r--r-- | example-cdc/sample.c | 20 |
1 files changed, 16 insertions, 4 deletions
diff --git a/example-cdc/sample.c b/example-cdc/sample.c index 0451049..c95680f 100644 --- a/example-cdc/sample.c +++ b/example-cdc/sample.c @@ -66,12 +66,24 @@ usb_intr (void *arg) chopstx_intr_t interrupt; (void)arg; - asm volatile ("cpsid i" : : : "memory"); - /* Disable because of usb_lld_init assumes interrupt handler. */ usb_lld_init (0x80); /* Bus powered. */ chopstx_claim_irq (&interrupt, INTR_REQ_USB); - /* Enable */ - asm volatile ("cpsie i" : : : "memory"); + + /* + * 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. + * + */ + usb_interrupt_handler (); while (1) { |