mirror of https://github.com/ArduPilot/ardupilot
97 lines
2.0 KiB
C++
97 lines
2.0 KiB
C++
#include <AP_HAL/AP_HAL.h>
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#if CONFIG_HAL_BOARD == HAL_BOARD_LINUX
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#include "RCInput_UART.h"
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#include <errno.h>
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#include <fcntl.h>
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#include <inttypes.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <termios.h>
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#include <unistd.h>
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#define MAGIC 0x55AA
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using namespace Linux;
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RCInput_UART::RCInput_UART(const char *path)
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{
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_fd = open(path, O_RDONLY|O_NOCTTY|O_NONBLOCK|O_NDELAY);
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if (_fd < 0) {
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AP_HAL::panic("RCInput_UART: Error opening '%s': %s",
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path, strerror(errno));
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}
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}
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RCInput_UART::~RCInput_UART()
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{
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close(_fd);
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}
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void RCInput_UART::init()
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{
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struct termios options;
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tcgetattr(_fd, &options);
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cfsetispeed(&options, B115200);
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cfsetospeed(&options, B115200);
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options.c_cflag &= ~(PARENB|CSTOPB|CSIZE);
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options.c_cflag |= CS8;
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options.c_lflag &= ~(ICANON|ECHO|ECHOE|ISIG);
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options.c_iflag &= ~(IXON|IXOFF|IXANY);
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options.c_oflag &= ~OPOST;
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if (tcsetattr(_fd, TCSANOW, &options) != 0) {
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AP_HAL::panic("RCInput_UART: error configuring device: %s",
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strerror(errno));
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}
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tcflush(_fd, TCIOFLUSH);
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_pdata = (uint8_t *)&_data;
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_remain = sizeof(_data);
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}
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void RCInput_UART::_timer_tick()
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{
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ssize_t n;
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if ((n = ::read(_fd, _pdata, _remain)) <= 0)
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return;
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_remain -= n;
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_pdata += n;
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if (_remain != 0)
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return;
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if (_data.magic != MAGIC) {
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/* try to find the magic number and move
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* it to the beggining of our buffer */
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uint16_t magic = MAGIC;
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_pdata = (uint8_t *)memmem(&_data, sizeof(_data), &magic, sizeof(magic));
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if (!_pdata)
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_pdata = (uint8_t *)&_data + sizeof(_data) - 1;
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_remain = _pdata - (uint8_t *)&_data;
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n = sizeof(_data) - _remain;
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memmove(&_data, _pdata, n);
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_pdata = (uint8_t *)&_data + n;
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return;
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}
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_update_periods(_data.values, CHANNELS);
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_pdata = (uint8_t *)&_data;
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_remain = sizeof(_data);
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}
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#endif
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