HAL_UARTModemControl (changes)
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Hardware Abstraction Layer
HAL entry points from RISC OS
ยป HAL_UARTModemControl
HAL_UARTModemControl
(HAL entry #81)
int HAL_UARTModemControl(int port, int eor, int mask)
| Entry | |
|---|---|
| port | Port number to modify |
| eor | EOR mask |
| mask | AND mask |
| Exit | |
|---|---|
| - | Returns the previous state |
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.
Modifies the modem control outputs. The state is updated as follows:
new_state = (old_state AND mask) EOR eor
The meanings of the bits are as follows:
| Bit | Meaning |
|---|---|
| 0 | DTR |
| 1 | RTS (read-only if bit |
| 2 | |
| 3 | internal use |
| 4 | internal use |
| 5 | Enable hardware RTS/CTS control |
Note that these are logical outputs, although the physical pins may be inverted. So 1 indicates a request to send.
See also
Information source: Kernel.Docs.HAL.Serial in CVS
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