/**
* \brief SPI command
*
* \param register_index The Register Index as SPI command to COG
* \param register_data The Register Data for sending command data to COG
*/
void epd_spi_send_byte (uint8_t register_index, uint8_t register_data) {
EPD_cs_low ();
epd_spi_write (0x70); // header of Register Index
epd_spi_write (register_index);
EPD_cs_high ();
Wait_10us ();
EPD_cs_low ();
epd_spi_write (0x72); // header of Register Data
epd_spi_write (register_data);
EPD_cs_high ();
}
/**
* \brief SPI command if register data is larger than two bytes
*
* \param register_index The Register Index as SPI command to COG
* \param register_data The Register Data for sending command data to COG
* \param length The number of bytes of Register Data which depends on which
* Register Index is selected.
*/
void epd_spi_send (unsigned char register_index, unsigned char *register_data,
unsigned length) {
EPD_cs_low ();
epd_spi_write (0x70); // header of Register Index
epd_spi_write (register_index);
EPD_cs_high ();
Wait_10us ();
EPD_cs_low ();
epd_spi_write (0x72); // header of Register Data of write command
while(length--) {
epd_spi_write (*register_data++);
}
EPD_cs_high ();
}
/**
* \brief SPI command
*
* \param Register The Register Index as SPI Data to COG
* \param Data The Register Data for sending command data to COG
* \return the SPI read value
*/
uint8_t SPI_R(uint8_t Register, uint8_t Data) {
uint8_t result;
EPD_cs_low ();
epd_spi_write (0x70); // header of Register Index
epd_spi_write (Register);
EPD_cs_high ();
Wait_10us ();
EPD_cs_low ();
epd_spi_write (0x73); // header of Register Data of read command
result=epd_spi_read (Data);
EPD_cs_high ();
return result;
}
/**
* \brief Power on COG Driver
* \note For detailed flow and description, please refer to the COG G2 document Section 3.
*/
void EPD_power_on (void) {
/* Initial state */
EPD_Vcc_turn_on(); //Vcc and Vdd >= 2.7V
EPD_cs_high();
EPD_border_high();
EPD_rst_high();
delay_ms(5);
EPD_rst_low();
delay_ms(5);
EPD_rst_high();
delay_ms(5);
}
/**
* \brief Initialize SPI
*/
void epd_spi_attach (void) {
EPD_flash_cs_high();
EPD_cs_high();
epd_spi_init();
}
/**
* \brief Set EPD_CS to high and Flash_CS to low
*/
void Flash_cs_low(void) {
EPD_cs_high();
EPD_flash_cs_low();
}
