86 lines
3.1 KiB
C
86 lines
3.1 KiB
C
/*
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* This file is part of the MicroPython project, http://micropython.org/
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*
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* The MIT License (MIT)
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*
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* Copyright (c) 2020 Mark Komus
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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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
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* THE SOFTWARE.
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*/
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#include "shared-bindings/adafruit_bus_device/SPIDevice.h"
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#include "shared-bindings/busio/SPI.h"
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#include "shared-bindings/digitalio/DigitalInOut.h"
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#include "py/mperrno.h"
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#include "py/nlr.h"
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#include "py/runtime.h"
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void common_hal_adafruit_bus_device_spidevice_construct(adafruit_bus_device_spidevice_obj_t *self, busio_spi_obj_t *spi, digitalio_digitalinout_obj_t *cs,
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uint32_t baudrate, uint8_t polarity, uint8_t phase, uint8_t extra_clocks) {
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self->spi = spi;
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self->baudrate = baudrate;
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self->polarity = polarity;
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self->phase = phase;
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self->extra_clocks = extra_clocks;
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self->chip_select = cs;
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}
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void common_hal_adafruit_bus_device_spidevice_enter(adafruit_bus_device_spidevice_obj_t *self) {
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bool success = false;
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while (!success) {
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success = common_hal_busio_spi_try_lock(self->spi);
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RUN_BACKGROUND_TASKS;
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mp_handle_pending();
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}
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common_hal_busio_spi_configure(self->spi, self->baudrate, self->polarity, self->phase, 8);
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if (self->chip_select != MP_OBJ_NULL) {
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common_hal_digitalio_digitalinout_set_value(MP_OBJ_TO_PTR(self->chip_select), false);
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}
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}
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void common_hal_adafruit_bus_device_spidevice_exit(adafruit_bus_device_spidevice_obj_t *self) {
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if (self->chip_select != MP_OBJ_NULL) {
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common_hal_digitalio_digitalinout_set_value(MP_OBJ_TO_PTR(self->chip_select), true);
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}
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if (self->extra_clocks > 0) {
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mp_buffer_info_t bufinfo;
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mp_obj_t buffer = mp_obj_new_bytearray_of_zeros(1);
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mp_get_buffer_raise(buffer, &bufinfo, MP_BUFFER_READ);
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((uint8_t*)bufinfo.buf)[0] = 0xFF;
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uint8_t clocks = self->extra_clocks / 8;
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if ((self->extra_clocks % 8) != 0)
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clocks += 1;
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while (clocks > 0) {
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if (!common_hal_busio_spi_write(self->spi, ((uint8_t*)bufinfo.buf), 1)) {
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mp_raise_OSError(MP_EIO);
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}
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clocks--;
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}
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}
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common_hal_busio_spi_unlock(self->spi);
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}
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