flex_set_port_direction |
Set I/O Port Direction
Usage
status = flex_set_port_direction(u8 boardID, u8 port, u16 directionMap);
Purpose
Sets the direction of a general-purpose I/O port as input or output.
Parameters
| Name | Type | Description |
|---|---|---|
| boardID | u8 | assigned by Measurement & Automation Explorer (MAX) |
| port | u8 | general-purpose I/O port to control |
| directionMap | u16 | port direction control |
Parameter Discussion
port is the general-purpose I/O port (NIMC_IO_PORT1 through NIMC_IO_PORT8) to control. Refer to 73xx Controller General-Purpose I/O Port IDs for general-purpose I/O port resource IDs.
directionMap is the bitmap of directions for the bits in the I/O port:
| D15 | ... | D9 | D8 | D7 | D6 | D5 | D4 | D3 | D2 | D1 | D0 |
| XXX | ... | XXX | XXX | Bit 7 | Bit 6 | Bit 5 | Bit 4 | Bit 3 | Bit 2 | Bit 1 | Bit 0 |
For D0 through D7:
1 = Input (default)
0 = Output
Using This Function
This function configures the bits in a general-purpose I/O port as input or output. After setting the direction, use the Read I/O Port function to read the port, the Set I/O Port MOMO function to write to the port, and the Set I/O Port Polarity function to set the polarity of each bit in the port to active high or active low.
 |
Note The direction of bits in the RTSI software port (NIMC_RTSI_PORT) is controlled with the Select Signal function. |