STM32_RTTY/radio.c

//
// Created by Admin on 2016-12-24.
//

#include "radio.h"

uint8_t _spi_sendrecv(const uint16_t data_word) {
  GPIO_ResetBits(GPIOC, radioNSELpin);
  // wait for tx buffer
  while (SPI_I2S_GetFlagStatus(SPI2, SPI_I2S_FLAG_TXE) == RESET);
  SPI_I2S_SendData(SPI2, data_word);

  // wait for data in rx buffer
  while (SPI_I2S_GetFlagStatus(SPI2, SPI_I2S_FLAG_RXNE) == RESET);
  GPIO_SetBits(GPIOC, radioNSELpin);
  return (uint8_t) SPI_I2S_ReceiveData(SPI2);
}

uint8_t radio_rw_register(const uint8_t register_addr, uint8_t value, uint8_t write){
  return _spi_sendrecv(((write ? register_addr | WR : register_addr) << 8) | value);
}

void radio_set_tx_frequency() {

  uint8_t gen_div  =  3;  //Stała nie zmieniac
  uint16_t fc = (uint16_t) (((freq / ((26.0 / gen_div) * (fbsel + 1))) - fb - 24) * 64000);

  radio_rw_register(0x75, 0x61, 1); // FIXME: tutaj powinno zdaje się być ustawiane fbsel?!
  radio_rw_register(0x76, (uint8_t) (((uint16_t)fc >> 8) & 0xff), 1);
  radio_rw_register(0x77, (uint8_t) ((uint16_t)fc & 0xff), 1);
}

void radio_disable_tx() {
  radio_rw_register(0x07, 0x40, 1);
}

void radio_soft_reset() {
  radio_rw_register(0x07, 0x80, 1);
}

void radio_enable_tx() {
  radio_rw_register(0x07, 0x48, 1);
}