112 lines
2.5 KiB
C++
112 lines
2.5 KiB
C++
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// STL includes
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#include <cstring>
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#include <cstdio>
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#include <iostream>
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#include <cerrno>
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// Linux includes
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#include <fcntl.h>
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#include <sys/ioctl.h>
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// Local Hyperion includes
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#include "ProviderSpi.h"
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#include <utils/Logger.h>
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ProviderSpi::ProviderSpi(const Json::Value &deviceConfig)
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: LedDevice()
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, _fid(-1)
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{
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if (deviceConfig != Json::nullValue)
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{
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setConfig(deviceConfig);
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}
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memset(&_spi, 0, sizeof(_spi));
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}
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ProviderSpi::~ProviderSpi()
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{
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// close(_fid);
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}
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bool ProviderSpi::setConfig(const Json::Value &deviceConfig, int defaultBaudRateHz)
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{
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_deviceName = deviceConfig.get("output","/dev/spidev0.0").asString();
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_baudRate_Hz = deviceConfig.get("rate",defaultBaudRateHz).asInt();
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_latchTime_ns = deviceConfig.get("latchtime",0).asInt();
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_spiMode = deviceConfig.get("spimode",SPI_MODE_0).asInt();
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_spiDataInvert = deviceConfig.get("invert",false).asBool();
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return true;
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}
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int ProviderSpi::open()
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{
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Debug(_log, "_baudRate_Hz %d, _latchTime_ns %d", _baudRate_Hz, _latchTime_ns);
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Debug(_log, "_spiDataInvert %d, _spiMode %d", _spiDataInvert, _spiMode);
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const int bitsPerWord = 8;
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_fid = ::open(_deviceName.c_str(), O_RDWR);
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if (_fid < 0)
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{
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Error( _log, "Failed to open device (%s). Error message: %s", _deviceName.c_str(), strerror(errno) );
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return -1;
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}
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if (ioctl(_fid, SPI_IOC_WR_MODE, &_spiMode) == -1 || ioctl(_fid, SPI_IOC_RD_MODE, &_spiMode) == -1)
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{
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return -2;
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}
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if (ioctl(_fid, SPI_IOC_WR_BITS_PER_WORD, &bitsPerWord) == -1 || ioctl(_fid, SPI_IOC_RD_BITS_PER_WORD, &bitsPerWord) == -1)
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{
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return -4;
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}
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if (ioctl(_fid, SPI_IOC_WR_MAX_SPEED_HZ, &_baudRate_Hz) == -1 || ioctl(_fid, SPI_IOC_RD_MAX_SPEED_HZ, &_baudRate_Hz) == -1)
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{
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return -6;
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}
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return 0;
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}
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int ProviderSpi::writeBytes(const unsigned size, const uint8_t * data)
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{
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if (_fid < 0)
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{
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return -1;
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}
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_spi.tx_buf = __u64(data);
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_spi.len = __u32(size);
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if (_spiDataInvert)
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{
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uint8_t * newdata = (uint8_t *)malloc(size);
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for (unsigned i = 0; i<size; i++) {
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newdata[i] = data[i] ^ 0xff;
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}
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_spi.tx_buf = __u64(newdata);
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}
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int retVal = ioctl(_fid, SPI_IOC_MESSAGE(1), &_spi);
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ErrorIf((retVal < 0), _log, "SPI failed to write. errno: %d, %s", errno, strerror(errno) );
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if (retVal == 0 && _latchTime_ns > 0)
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{
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// The 'latch' time for latching the shifted-value into the leds
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timespec latchTime;
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latchTime.tv_sec = 0;
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latchTime.tv_nsec = _latchTime_ns;
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// Sleep to latch the leds (only if write succesfull)
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nanosleep(&latchTime, NULL);
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}
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return retVal;
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}
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