61af64e734
Use set_pin_mode() to set pinmux for UART RX and TX pins. This is similar effect as running the config-pin utility. Signed-off-by: Drew Fustini <drew@pdp7.com>
134 lines
4.1 KiB
C
134 lines
4.1 KiB
C
/*
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Copyright (c) 2013 Adafruit
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Author: Justin Cooper
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Permission is hereby granted, free of charge, to any person obtaining a copy of
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this software and associated documentation files (the "Software"), to deal in
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the Software without restriction, including without limitation the rights to
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use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies
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of the Software, and to permit persons to whom the Software is furnished to do
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so, subject to the following conditions:
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The above copyright notice and this permission notice shall be included in all
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copies or substantial portions of the Software.
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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SOFTWARE.
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*/
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#include "Python.h"
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#include "constants.h"
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#include "common.h"
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#include "c_uart.h"
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#include "c_pinmux.h"
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const char *valid_uarts[4] = {"UART1", "UART2", "UART4", "UART5"};
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// python function cleanup()
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static PyObject *py_cleanup(__attribute__ ((unused)) PyObject *self, __attribute__ ((unused)) PyObject *args)
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{
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// unexport the UART
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uart_cleanup();
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Py_RETURN_NONE;
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}
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// python function setup()
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static PyObject *py_setup_uart(__attribute__ ((unused)) PyObject *self, PyObject *args)
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{
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char dt[FILENAME_BUFFER_SIZE];
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char *channel;
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BBIO_err err;
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if (!PyArg_ParseTuple(args, "s", &channel)) {
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PyErr_SetString(PyExc_ValueError, "Invalid UART channel.");
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return NULL;
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}
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err = get_uart_device_tree_name(channel, dt);
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if (err != BBIO_OK) {
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PyErr_SetString(PyExc_ValueError, "Invalid UART channel.");
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return NULL;
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}
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err = uart_setup(dt);
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if (err != BBIO_OK) {
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PyErr_SetString(PyExc_RuntimeError, "Unable to export UART channel.");
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return NULL;
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}
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#ifdef BBBVERSION41
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uart_t *p;
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for (p = uart_table; p->name != NULL; ++p) {
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if (strcmp(p->name, channel) == 0) {
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err = set_pin_mode(p->rx, "uart");
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//Check if set_pin_mode() returned no error
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if (err != BBIO_OK) {
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fprintf(stderr, "py_setup_uart(%s): set_pin_mode() failed for pin=%s", channel, p->rx);
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PyErr_SetString(PyExc_ValueError, "Set pin mode failed for uart channel.");
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return NULL;
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}
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err = set_pin_mode(p->tx, "uart");
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//Check if set_pin_mode() returned no error
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if (err != BBIO_OK) {
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fprintf(stderr, "py_setup_uart(%s): set_pin_mode() failed for pin=%s", channel, p->tx);
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PyErr_SetString(PyExc_ValueError, "Set pin mode failed for uart channel.");
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return NULL;
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}
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}
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}
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#endif
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Py_RETURN_NONE;
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}
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static const char moduledocstring[] = "UART functionality of a BeagleBone using Python";
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PyMethodDef uart_methods[] = {
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{"setup", py_setup_uart, METH_VARARGS, "Set up and start the UART channel."},
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{"cleanup", py_cleanup, METH_VARARGS, "Clean up UART."},
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//{"setwarnings", py_setwarnings, METH_VARARGS, "Enable or disable warning messages"},
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{NULL, NULL, 0, NULL}
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};
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#if PY_MAJOR_VERSION > 2
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static struct PyModuleDef bbuartmodule = {
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PyModuleDef_HEAD_INIT,
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"UART", // name of module
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moduledocstring, // module documentation, may be NULL
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-1, // size of per-interpreter state of the module, or -1 if the module keeps state in global variables.
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uart_methods
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};
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#endif
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#if PY_MAJOR_VERSION > 2
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PyMODINIT_FUNC PyInit_UART(void)
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#else
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PyMODINIT_FUNC initUART(void)
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#endif
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{
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PyObject *module = NULL;
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#if PY_MAJOR_VERSION > 2
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if ((module = PyModule_Create(&bbuartmodule)) == NULL)
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return NULL;
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#else
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if ((module = Py_InitModule3("UART", uart_methods, moduledocstring)) == NULL)
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return;
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#endif
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define_constants(module);
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#if PY_MAJOR_VERSION > 2
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return module;
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#else
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return;
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#endif
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}
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