VAPC2/lib/max7219.c

/* MAX7219 Interaction Code
 * ---------------------------
 * For more information see
 * http://www.adnbr.co.uk/articles/max7219-and-7-segment-displays
 * ----------------------------------------------------------------------------
 * "THE BEER-WARE LICENSE" (Revision 42):
 * <shilow@ukr.net> wrote this file.  As long as you retain this notice you
 * can do whatever you want with this stuff. If we meet some day, and you think
 * this stuff is worth it, you can buy me a beer in return.   Shilov V.N.
 * ----------------------------------------------------------------------------
 */

#include "max7219.h"

void MAX7219_Config(void) {
  /* Настройка MAX71219 */
  MAX7219_WriteData(RegDecodeMode, 0x00);            // все без BCD декодирования
  MAX7219_WriteData(RegScanLimit, MAX7219_DIGITS);   // сколько цифр используем
  MAX7219_WriteData(RegIntensity, MAX7219_BRIGHT);   // яркость из 16
  MAX7219_WriteData(RegPower, MAX7219_ON);           // включили питание

}

void MAX7219_WriteData(max7219_reg_t reg, uint8_t data) {
  /*!< Wait wait until the completion of the transfer. */
  while ((SPI->SR & 0x80) != RESET);
  /* Down LOAD pin */
  SPI_LOAD_PORT->ODR &= ~(SPI_LOAD);

  /*!< Wait until the transmit buffer is empty */
  while ((SPI->SR & 0x02) == RESET);
  /* Send the register where the data will be stored */
  SPI->DR = reg; /* Write in the DR register the data to be sent*/

  /*!< Wait until the transmit buffer is empty */
  while ((SPI->SR & 0x02) == RESET);
  /* Send the data to be stored */
  SPI->DR = data; /* Write in the DR register the data to be sent*/

  /*!< Wait wait until the completion of the transfer. */
  while ((SPI->SR & 0x80) != RESET);
  /* Up LOAD pin */
  SPI_LOAD_PORT->ODR |= SPI_LOAD;
}