diff options
Diffstat (limited to 'apps/drivers/device/spi.cpp')
| -rw-r--r-- | apps/drivers/device/spi.cpp | 160 |
1 files changed, 0 insertions, 160 deletions
diff --git a/apps/drivers/device/spi.cpp b/apps/drivers/device/spi.cpp deleted file mode 100644 index 8fffd60cb..000000000 --- a/apps/drivers/device/spi.cpp +++ /dev/null @@ -1,160 +0,0 @@ -/**************************************************************************** - * - * Copyright (C) 2012 PX4 Development Team. All rights reserved. - * - * Redistribution and use in source and binary forms, with or without - * modification, are permitted provided that the following conditions - * are met: - * - * 1. Redistributions of source code must retain the above copyright - * notice, this list of conditions and the following disclaimer. - * 2. Redistributions in binary form must reproduce the above copyright - * notice, this list of conditions and the following disclaimer in - * the documentation and/or other materials provided with the - * distribution. - * 3. Neither the name PX4 nor the names of its contributors may be - * used to endorse or promote products derived from this software - * without specific prior written permission. - * - * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS - * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT - * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS - * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE - * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, - * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, - * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS - * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED - * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT - * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN - * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE - * POSSIBILITY OF SUCH DAMAGE. - * - ****************************************************************************/ - -/** - * @file spi.cpp - * - * Base class for devices connected via SPI. - * - * @todo Work out if caching the mode/frequency would save any time. - * - * @todo A separate bus/device abstraction would allow for mixed interrupt-mode - * and non-interrupt-mode clients to arbitrate for the bus. As things stand, - * a bus shared between clients of both kinds is vulnerable to races between - * the two, where an interrupt-mode client will ignore the lock held by the - * non-interrupt-mode client. - */ - -#include <nuttx/arch.h> - -#include "spi.h" - -#ifndef CONFIG_SPI_EXCHANGE -# error This driver requires CONFIG_SPI_EXCHANGE -#endif - -namespace device -{ - -SPI::SPI(const char *name, - const char *devname, - int bus, - enum spi_dev_e device, - enum spi_mode_e mode, - uint32_t frequency, - int irq) : - // base class - CDev(name, devname, irq), - // public - // protected - // private - _bus(bus), - _device(device), - _mode(mode), - _frequency(frequency), - _dev(nullptr) -{ -} - -SPI::~SPI() -{ - // XXX no way to let go of the bus... -} - -int -SPI::init() -{ - int ret = OK; - - /* attach to the spi bus */ - if (_dev == nullptr) - _dev = up_spiinitialize(_bus); - - if (_dev == nullptr) { - debug("failed to init SPI"); - ret = -ENOENT; - goto out; - } - - /* deselect device to ensure high to low transition of pin select */ - SPI_SELECT(_dev, _device, false); - - /* call the probe function to check whether the device is present */ - ret = probe(); - - if (ret != OK) { - debug("probe failed"); - goto out; - } - - /* do base class init, which will create the device node, etc. */ - ret = CDev::init(); - - if (ret != OK) { - debug("cdev init failed"); - goto out; - } - - /* tell the workd where we are */ - log("on SPI bus %d at %d", _bus, _device); - -out: - return ret; -} - -int -SPI::probe() -{ - // assume the device is too stupid to be discoverable - return OK; -} - -int -SPI::transfer(uint8_t *send, uint8_t *recv, unsigned len) -{ - - if ((send == nullptr) && (recv == nullptr)) - return -EINVAL; - - /* do common setup */ - if (!up_interrupt_context()) - SPI_LOCK(_dev, true); - - SPI_SETFREQUENCY(_dev, _frequency); - SPI_SETMODE(_dev, _mode); - SPI_SETBITS(_dev, 8); - SPI_SELECT(_dev, _device, true); - - /* do the transfer */ - SPI_EXCHANGE(_dev, send, recv, len); - - /* and clean up */ - SPI_SELECT(_dev, _device, false); - - if (!up_interrupt_context()) - SPI_LOCK(_dev, false); - - return OK; -} - -} // namespace device |