SR74HCT595.cpp

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// Copyright (c) 2024 anabrid GmbH
// Contact: https://www.anabrid.com/licensing/
// SPDX-License-Identifier: MIT OR GPL-2.0-or-later
 
#include "SR74HCT595.h"
 
const SPISettings functions::SR74HCT595::DEFAULT_SPI_SETTINGS{
    4'000'000, MSBFIRST, SPI_MODE3 /* Chip expects MODE0, CLK is inverted on the way */};
 
const SPISettings functions::SR74HCT595::DEFAULT_SPI_SETTINGS_SHIFTED_CLOCK{
    4'000'000, MSBFIRST,
    SPI_MODE2 /* Chip expects MODE0, CLK is inverted on the way, but MOSI is not, thus CLK must be shifted */};
 
functions::SR74HCT595::SR74HCT595(bus::addr_t address, bool shift_clock)
    : functions::DataFunction(address,
                              shift_clock ? DEFAULT_SPI_SETTINGS_SHIFTED_CLOCK : DEFAULT_SPI_SETTINGS) {}
 
bool functions::SR74HCT595::transfer(const void *mosi_buf, void *miso_buf, size_t count) const {
  DataFunction::transfer(mosi_buf, miso_buf, count);
#ifdef ANABRID_PEDANTIC
  uint8_t miso_check[count];
  DataFunction::transfer(mosi_buf, miso_check, count);
  return memcmp(mosi_buf, miso_check, count) == 0;
#else
  return true;
#endif
}
 
bool functions::SR74HCT595::transfer8(uint8_t data_in, uint8_t *data_out) const {
  auto ret = DataFunction::transfer8(data_in);
  if (data_out)
    *data_out = ret;
#ifdef ANABRID_PEDANTIC
  auto written_data = DataFunction::transfer8(data_in);
  return written_data == data_in;
#else
  return true;
#endif
}
 
bool functions::SR74HCT595::transfer16(uint16_t data_in, uint16_t *data_out) const {
  auto ret = DataFunction::transfer16(data_in);
  if (data_out)
    *data_out = ret;
#ifdef ANABRID_PEDANTIC
  auto written_data = DataFunction::transfer16(data_in);
  return written_data == data_in;
#else
  return true;
#endif
}
 
bool functions::SR74HCT595::transfer32(uint32_t data_in, uint32_t *data_out) const {
  auto ret = DataFunction::transfer32(data_in);
  if (data_out)
    *data_out = ret;
#ifdef ANABRID_PEDANTIC
  auto written_data = DataFunction::transfer32(data_in);
  return written_data == data_in;
#else
  return true;
#endif
}