mirror of https://github.com/ArduPilot/ardupilot
156 lines
3.7 KiB
C++
156 lines
3.7 KiB
C++
#include "SPIUARTDriver.h"
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#include <assert.h>
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#include <stdlib.h>
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#include <cstdio>
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#include <AP_HAL/AP_HAL.h>
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extern const AP_HAL::HAL &hal;
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#ifdef SPIUART_DEBUG
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#include <stdio.h>
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#define debug(fmt, args ...) do {hal.console->printf("[SPIUARTDriver]: %s:%d: " fmt "\n", __FUNCTION__, __LINE__, ## args); } while(0)
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#define error(fmt, args ...) do {fprintf(stderr,"%s:%d: " fmt "\n", __FUNCTION__, __LINE__, ## args); } while(0)
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#else
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#define debug(fmt, args ...)
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#define error(fmt, args ...)
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#endif
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using namespace Linux;
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SPIUARTDriver::SPIUARTDriver()
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: UARTDriver(false)
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{
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}
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void SPIUARTDriver::begin(uint32_t b, uint16_t rxS, uint16_t txS)
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{
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if (device_path != NULL) {
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UARTDriver::begin(b, rxS, txS);
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if (is_initialized()) {
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_external = true;
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return;
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}
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}
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if (!is_initialized()) {
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_dev = hal.spi->get_device("ublox");
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if (!_dev) {
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return;
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}
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}
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if (rxS < 1024) {
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rxS = 2048;
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}
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if (txS < 1024) {
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txS = 2048;
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}
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_readbuf.set_size(rxS);
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_writebuf.set_size(txS);
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if (_buffer == NULL) {
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/* Do not allocate new buffer, if we're just changing speed */
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_buffer = new uint8_t[rxS];
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if (_buffer == NULL) {
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hal.console->printf("Not enough memory\n");
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AP_HAL::panic("Not enough memory\n");
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}
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}
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switch (b) {
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case 4000000U:
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if (is_initialized()) {
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/* Do not allow speed changes before device is initialized, because
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* it can lead to misconfiguraration. Once the device is initialized,
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* it's sage to update speed
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*/
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_dev->set_speed(AP_HAL::Device::SPEED_HIGH);
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debug("Set higher SPI-frequency");
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} else {
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_dev->set_speed(AP_HAL::Device::SPEED_LOW);
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debug("Set lower SPI-frequency");
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}
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break;
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default:
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_dev->set_speed(AP_HAL::Device::SPEED_LOW);
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debug("Set lower SPI-frequency");
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debug("%s: wrong baudrate (%u) for SPI-driven device. setting default speed", __func__, b);
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break;
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}
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_initialised = true;
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}
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int SPIUARTDriver::_write_fd(const uint8_t *buf, uint16_t size)
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{
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if (_external) {
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return UARTDriver::_write_fd(buf,size);
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}
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if (!_dev->get_semaphore()->take_nonblocking()) {
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return 0;
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}
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_dev->transfer_fullduplex(buf, _buffer, size);
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_dev->get_semaphore()->give();
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uint16_t ret = size;
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/* Since all SPI-transactions are transfers we need update
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* the _readbuf. I do believe there is a way to encapsulate
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* this operation since it's the same as in the
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* UARTDriver::write().
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*/
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_readbuf.write(_buffer, size);
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return ret;
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}
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static uint8_t ff_stub[300] = {0xff};
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int SPIUARTDriver::_read_fd(uint8_t *buf, uint16_t n)
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{
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if (_external) {
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return UARTDriver::_read_fd(buf, n);
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}
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/* Make SPI transactions shorter. It can save SPI bus from keeping too
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* long. It's essential for NavIO as MPU9250 is on the same bus and
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* doesn't like to be waiting. Making transactions more frequent but shorter
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* is a win.
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*/
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if (n > 100) {
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n = 100;
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}
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if (!_dev->get_semaphore()->take_nonblocking()) {
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return 0;
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}
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_dev->transfer_fullduplex(ff_stub, buf, n);
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_dev->get_semaphore()->give();
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return n;
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}
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void SPIUARTDriver::_timer_tick(void)
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{
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if (_external) {
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UARTDriver::_timer_tick();
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return;
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}
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/* lower the update rate */
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if (AP_HAL::micros() - _last_update_timestamp < 10000) {
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return;
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}
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UARTDriver::_timer_tick();
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_last_update_timestamp = AP_HAL::micros();
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}
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