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HAL_USBPortIRQ
Hardware Abstraction Layer
HAL entry points from RISC OS
ยป HAL_USBPortIRQ
HAL_USBPortIRQ
(HAL entry #111)
int HAL_USBPortIRQ(int port, int mode)
| Entry | |
|---|---|
| port | Port number to query |
| mode | Operation to perform; see below |
| Exit | |
|---|---|
| - | Return value is dependent upon mode |
Use
This is an internal call for OS use only and should not be used by user software.
Used to query the port overcurrent IRQ number, and to service the interrupt. mode behaves as follows:
| mode | Operation | Return value |
|---|---|---|
| 0 | Disable IRQ source | Returns IRQ device number |
| 1 | Enable IRQ source and acknowledge the IRQ | Unknown |
| 2 | Read IRQ status and acknowledge the IRQ | 0: Port overcurrent IRQ did not occur |
| 1: Port overcurrent IRQ did occur |