mirror of https://github.com/ArduPilot/ardupilot
130 lines
3.7 KiB
C++
130 lines
3.7 KiB
C++
/*
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* This file is free software: you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the
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* Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This file is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
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* See the GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include "Device.h"
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#include <stdio.h>
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/*
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using checked registers allows a device check that a set of critical
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register values don't change at runtime. This is useful on key
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sensors (such as IMUs) which may experience brownouts or other
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issues in flight
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To use register checking call setup_checked_registers() once to
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allocate the space for the checked register values. The set the
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checked flag on any write_register() calls that you want protected.
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Periodically (say at 50Hz) you should then call
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check_next_register(). If that returns false then the sensor has had
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a corrupted register value. Marking the sensor as unhealthy is
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approriate. The bad value will be corrected
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*/
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/*
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setup nregs checked registers
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*/
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bool AP_HAL::Device::setup_checked_registers(uint8_t nregs, uint8_t frequency)
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{
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if (_checked.regs != nullptr) {
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delete[] _checked.regs;
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_checked.n_allocated = 0;
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_checked.n_set = 0;
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_checked.next = 0;
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}
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_checked.regs = new struct checkreg[nregs];
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if (_checked.regs == nullptr) {
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return false;
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}
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_checked.n_allocated = nregs;
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_checked.frequency = frequency;
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_checked.counter = 0;
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return true;
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}
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/*
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set value of one checked register
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*/
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void AP_HAL::Device::set_checked_register(uint8_t reg, uint8_t val)
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{
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set_checked_register(0, reg, val);
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}
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void AP_HAL::Device::set_checked_register(uint8_t bank, uint8_t reg, uint8_t val)
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{
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if (_checked.regs == nullptr) {
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return;
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}
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struct checkreg *regs = _checked.regs;
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for (uint8_t i=0; i<_checked.n_set; i++) {
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if (regs[i].regnum == reg && regs[i].bank == bank) {
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regs[i].value = val;
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return;
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}
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}
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if (_checked.n_set == _checked.n_allocated) {
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printf("Not enough checked registers for reg 0x%02x on device 0x%x\n",
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(unsigned)reg, (unsigned)get_bus_id());
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return;
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}
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regs[_checked.n_set].bank = bank;
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regs[_checked.n_set].regnum = reg;
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regs[_checked.n_set].value = val;
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_checked.n_set++;
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}
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/*
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check one register value
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*/
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bool AP_HAL::Device::check_next_register(void)
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{
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if (_checked.n_set == 0) {
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return true;
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}
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if (++_checked.counter < _checked.frequency) {
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return true;
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}
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_checked.counter = 0;
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struct checkreg ® = _checked.regs[_checked.next];
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uint8_t v;
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if (_bank_select) {
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if (!_bank_select(reg.bank)) {
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// Cannot set bank
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#if 0
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printf("Device 0x%x set bank 0x%02x\n",
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(unsigned)get_bus_id(),
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(unsigned)reg.bank);
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#endif
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return false;
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}
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}
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if (!read_registers(reg.regnum, &v, 1) || v != reg.value) {
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// a register has changed value unexpectedly. Try changing it back
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// and re-check it next time
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#if 0
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printf("Device 0x%x fixing 0x%02x 0x%02x -> 0x%02x\n",
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(unsigned)get_bus_id(),
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(unsigned)reg.regnum, (unsigned)v, (unsigned)reg.value);
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#endif
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write_register(reg.regnum, reg.value);
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return false;
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}
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_checked.next = (_checked.next+1) % _checked.n_set;
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return true;
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}
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