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"

#define SPI_PORT        GPIOC
#define SPI_SCK         GPIO_PIN_5
#define SPI_MOSI        GPIO_PIN_6
#define SPI_PINS        (SPI_SCK|SPI_MOSI)
#define SPI_LOAD_PORT   GPIOD
#define SPI_LOAD        GPIO_PIN_3

#define GPIO_SetBits(port, pin)     port->ODR |= (uint8_t)pin
#define GPIO_ResetBits(port, pin)   GPIOx->ODR &= (uint8_t)(~PortPins)

void MAX7219_Config(void) {
  /* Set the MOSI,MISO and SCK at high level */
  SPI_PORT->CR1 |= (uint8_t)SPI_PINS;

  /* Configure LOAD pin to Push-Pull, High, Fast*/
  SPI_LOAD_PORT->ODR |= SPI_LOAD;
  SPI_LOAD_PORT->DDR |= SPI_LOAD;
  SPI_LOAD_PORT->CR1 |= SPI_LOAD;
  SPI_LOAD_PORT->CR2 &= (uint8_t)(~(SPI_LOAD));

  /* Enable clock for SPI */
  CLK->PCKENR1 |= 1 << 0x01;

  /* SPI_MODE_MASTER, SPI_FIRSTBIT_MSB, SPI_BAUDRATEPRESCALER_2, SPI_CLOCKPOLARITY_HIGH, SPI_CLOCKPHASE_2EDGE */
  SPI->CR1 = 0x04 | 0x00 | 0x00 | 0x02 | 0x01;

  /* SPI_DATADIRECTION_1LINE_TX, SPI_NSS_SOFT */
  SPI->CR2 = 0xC0 | 0x02 | SPI_CR2_SSI;

  /* SPI Enable */
  SPI->CR1 |= SPI_CR1_SPE;

  /* 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 &= (uint8_t)(~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;
}