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Enum pl_io_num |
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Enum pl_io_num contains the list of constants that refer to available GPIO lines. Use these constants when selecting the line with the io. object (see the io.num property).
Note that GPIO lines are of unidirectional type and require explicit configuration as outputs or inputs. Some lines are configured as inputs or outputs automatically -- see the notes at the bottom of the page.
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The EM1202EV-RS board and the DS1202 controller have RS232 transceiver IC onboard. This IC defines which I/O lines of the device should be configured as inputs, and which- as outputs. Specifically, do not try to use I/I lines 0, 2, 4, 6, and 7 as outputs -- this can permanently damage the hardware. |
Enum pl_io_num includes the following constants:
| 0- PL_IO_NUM_0_RX0_INT0(1): | General-purpose I/O line 0 (P0.0). This line is also the RX/W1in/din input of the serial port 0 and the interrupt line 0. |
| 1- PL_IO_NUM_1_TX0_INT4(2): | General-purpose I/O line 1 (P0.1). This line is also the TX/W1out/dout output of the serial port 0 and the interrupt line 4. |
| 2- PL_IO_NUM_2_RX1_INT1(1): | General-purpose I/O line 2 (P0.2). This line is also the RX/W0&1in/din input of the serial port 1 and the interrupt line 1. |
| 3- PL_IO_NUM_3_TX1_INT5(2): | General-purpose I/O line 3 (P0.3). This line is also the TX/W1out/dout output of the serial port 1 and the interrupt line 5. |
| 4- PL_IO_NUM_4_RX2_INT2(1): | General-purpose I/O line 4 (P0.4). This line is also the RX/W0&1in/din input of the serial port 2 and the interrupt line 2. |
| 5- PL_IO_NUM_5_TX2_INT6(2): | General-purpose I/O line 5 (P0.5). This line is also the TX/W1out/dout output of the serial port 2 and the interrupt line 6. |
| 6- PL_IO_NUM_6_RX3_INT3(1): | General-purpose I/O line 6 (P0.6). This line is also the RX/W0&1in/din input of the serial port 3 and the interrupt line 3. |
| 7- PL_IO_NUM_7_INT7(2): | General-purpose I/O line 7 (P0.7). This line is also the interrupt line 7. |
| PL_IO_NULL: | This is a NULL line that does not physically exist. The state of this line is always detected as LOW. Setting this line has no effect. |
Notes:
| 1. | Should be configured as an input. When a serial port is in the UART mode (ser.mode= 0- PL_SER_MODE_UART) this line is automatically configured to be an input when this serial port is enabled (ser.enabled= 1- YES) and returns to the previous input/output and high/low state when this serial port is closed (ser.enabled= 0- NO). When a serial port is in the Wiegand or clock/data mode (ser.mode= 1- PL_SER_MODE_WIEGAND or ser.mode= 2- PL_SER_MODE_CLOCKDATA), the line has to be configured as input by the application- this will not happen automatically. |
| 2. | Should be configured as an output. When a serial port is in the UART mode (ser.mode= 0- PL_SER_MODE_UART) this line is automatically configured to be an output when the serial port is enabled (ser.enabled= 1- YES) and returns to the previous input/output and high/low state when the serial port is closed (ser.enabled= 0- NO). When a serial port is in the Wiegand or clock/data mode (ser.mode= 1- PL_SER_MODE_WIEGAND or ser.mode= 2- PL_SER_MODE_CLOCKDATA), the line has to be configured as output by the application- this will not happen automatically. |
