Functions allowing to read and set GPIO line values for single lines and in bulk. More...
Collaboration diagram for Reading & setting line values:
Functions | |
| int | gpiod_line_get_value (struct gpiod_line *line) GPIOD_API |
| Read current value of a single GPIO line. More... | |
| int | gpiod_line_get_value_bulk (struct gpiod_line_bulk *bulk, int *values) GPIOD_API |
| Read current values of a set of GPIO lines. More... | |
| int | gpiod_line_set_value (struct gpiod_line *line, int value) GPIOD_API |
| Set the value of a single GPIO line. More... | |
| int | gpiod_line_set_value_bulk (struct gpiod_line_bulk *bulk, const int *values) GPIOD_API |
| Set the values of a set of GPIO lines. More... | |
Detailed Description
Functions allowing to read and set GPIO line values for single lines and in bulk.
Function Documentation
◆ gpiod_line_get_value()
| int gpiod_line_get_value | ( | struct gpiod_line * | line | ) |
Read current value of a single GPIO line.
- Parameters
-
line GPIO line object.
- Returns
- 0 or 1 if the operation succeeds. On error this routine returns -1 and sets the last error number.
◆ gpiod_line_get_value_bulk()
| int gpiod_line_get_value_bulk | ( | struct gpiod_line_bulk * | bulk, |
| int * | values | ||
| ) |
Read current values of a set of GPIO lines.
- Parameters
-
bulk Set of GPIO lines to reserve. values An array big enough to hold line_bulk->num_lines values.
- Returns
- 0 is the operation succeeds. In case of an error this routine returns -1 and sets the last error number.
If succeeds, this routine fills the values array with a set of values in the same order, the lines are added to line_bulk. If the lines were not previously requested together, the behavior is undefined.
◆ gpiod_line_set_value()
| int gpiod_line_set_value | ( | struct gpiod_line * | line, |
| int | value | ||
| ) |
Set the value of a single GPIO line.
- Parameters
-
line GPIO line object. value New value.
- Returns
- 0 is the operation succeeds. In case of an error this routine returns -1 and sets the last error number.
◆ gpiod_line_set_value_bulk()
| int gpiod_line_set_value_bulk | ( | struct gpiod_line_bulk * | bulk, |
| const int * | values | ||
| ) |
Set the values of a set of GPIO lines.
- Parameters
-
bulk Set of GPIO lines to reserve. values An array holding line_bulk->num_lines new values for lines. A NULL pointer is interpreted as a logical low for all lines.
- Returns
- 0 is the operation succeeds. In case of an error this routine returns -1 and sets the last error number.
If the lines were not previously requested together, the behavior is undefined.
