HAL_UARTInterruptID (changes)

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Hardware Abstraction Layer

HAL entry points from RISC OS

» HAL_UARTInterruptID

HAL_UARTInterruptID

(HAL entry #79)

int HAL_UARTInterruptID(int port)

Use

This is an internal call for use by the DualSerial module and should not be used by user code. Instead of calling the HAL directly, user code should interact with the Serial* entries that DualSerial creates in DeviceFS.

Returns the highest priority interrupt currently asserted. In order of priority:

• 3 => Receiver Line Status (Cleared by HAL_UARTReceiveByte/HAL_UARTLineStatus)
• 2 => Received Data Available (Cleared by reading enough data)
• 6 => Character Timeout (received data waiting)
• 1 => Transmitter TX Holding Register Empty (Cleared by this call) call)/FIFO under threshold (cleared by sending enough chars)
• 0 => Modem Status (Cleared by HAL_UARTModemStatus)
• -1 => No Interrupt

The Modem Status interrupt occurs when the CTS, DSR or DCD inputs change, or when RI goes from high to low (ie bits 0 to 3 of HAL_UARTModemStatus are set).

See also

• HAL UART API

Information source: Kernel.Docs.HAL.Serial in CVS