85 lines
1.6 KiB
C++
85 lines
1.6 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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// 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 "LedSpiDevice.h"
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LedSpiDevice::LedSpiDevice(const std::string& outputDevice, const unsigned baudrate, const int latchTime_ns) :
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mDeviceName(outputDevice),
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mBaudRate_Hz(baudrate),
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mLatchTime_ns(latchTime_ns),
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mFid(-1)
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{
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memset(&spi, 0, sizeof(spi));
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}
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LedSpiDevice::~LedSpiDevice()
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{
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// close(mFid);
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}
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int LedSpiDevice::open()
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{
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const int bitsPerWord = 8;
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mFid = ::open(mDeviceName.c_str(), O_RDWR);
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if (mFid < 0)
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{
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std::cerr << "Failed to open device('" << mDeviceName << "') " << std::endl;
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return -1;
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}
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int mode = SPI_MODE_0;
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if (ioctl(mFid, SPI_IOC_WR_MODE, &mode) == -1 || ioctl(mFid, SPI_IOC_RD_MODE, &mode) == -1)
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{
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return -2;
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}
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if (ioctl(mFid, SPI_IOC_WR_BITS_PER_WORD, &bitsPerWord) == -1 || ioctl(mFid, 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(mFid, SPI_IOC_WR_MAX_SPEED_HZ, &mBaudRate_Hz) == -1 || ioctl(mFid, SPI_IOC_RD_MAX_SPEED_HZ, &mBaudRate_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 LedSpiDevice::writeBytes(const unsigned size, const uint8_t * data)
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{
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if (mFid < 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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int retVal = ioctl(mFid, SPI_IOC_MESSAGE(1), &spi);
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if (retVal == 0 && mLatchTime_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 = mLatchTime_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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