diff options
Diffstat (limited to 'nuttx/include')
| -rw-r--r-- | nuttx/include/nuttx/net/enc28j60.h | 16 |
1 files changed, 16 insertions, 0 deletions
diff --git a/nuttx/include/nuttx/net/enc28j60.h b/nuttx/include/nuttx/net/enc28j60.h index 2e39d88ac..7d0d7c3e5 100644 --- a/nuttx/include/nuttx/net/enc28j60.h +++ b/nuttx/include/nuttx/net/enc28j60.h @@ -85,6 +85,22 @@ struct enc_stats_s /* The ENC28J60 normal provides interrupts to the MCU via a GPIO pin. The * following structure provides an MCU-independent mechanixm for controlling * the ENC28J60 GPIO interrupt. + * + * The ENC32J60 interrupt is an active low, *level* interrupt. "When an + * interrupt occurs, the interrupt flag is set. If the interrupt is enabled + * in the EIE register and the INTIE global interrupt enable bit is set, the + * INT pin will be driven low" + * + * "When an enabled interrupt occurs, the interrupt pin will remain low until + * all flags which are causing the interrupt are cleared or masked off + * (enable bit is cleared) by the host controller." However, the interrupt + * will behave like a falling edge interrupt because "After an interrupt + * occurs, the host controller [clears] the global enable bit for the + * interrupt pin before servicing the interrupt. Clearing the enable bit + * will cause the interrupt pin to return to the non-asserted state (high). + * Doing so will prevent the host controller from missing a falling edge + * should another interrupt occur while the immediate interrupt is being + * serviced." */ struct enc_lower_s |