/**
* \internal
* \brief Helper function to read a byte from an arbitrary interface
*
* This function is used to hide what interface is used by the driver, e.g.
* the driver does not need to know if USART in SPI mode is used or the native
* SPI module.
*/
__always_inline static uint8_t hx8347a_read_byte(void)
{
uint8_t data;
#if defined(CONF_HX8347A_USART_SPI)
# if UC3
/* A workaround for optimizing data transfer had to be done for the
* XMEGA in order for the display to work correctly at all SPI clock
* clock speeds */
/* This function could also be used for XMEGA but results in a very slow
* framerate, hence a workaround has been implemented for the XMEGA */
usart_spi_read_packet(CONF_HX8347A_USART_SPI, &data, 1);
# elif XMEGA
usart_spi_read_single(CONF_HX8347A_USART_SPI, &data);
# endif
#elif defined(CONF_HX8347A_SPI)
spi_write_single(CONF_HX8347A_SPI, 0xFF);
/* Wait for RX to complete */
while (!spi_is_rx_full(CONF_HX8347A_SPI)) {
/* Do nothing */
}
spi_read_single(CONF_HX8347A_SPI, &data);
#endif
return data;
}
/**
* \internal
* \brief Helper function to read a byte from an arbitrary interface
*
* This function is used to hide what interface is used by the component
* driver, e.g. the component driver does not need to know if USART in SPI
* mode is used or the native SPI module.
*
* \retval uint8_t Byte of data read from the display controller
*/
__always_inline static uint8_t ili9341_read_byte(void)
{
uint8_t data;
#if defined(CONF_ILI9341_USART_SPI)
# if XMEGA
/* Workaround for clearing the RXCIF for XMEGA */
usart_rx_enable(CONF_ILI9341_USART_SPI);
usart_put(CONF_ILI9341_USART_SPI, 0xFF);
while (!usart_rx_is_complete(CONF_ILI9341_USART_SPI)) {
/* Do nothing */
}
data = usart_get(CONF_ILI9341_USART_SPI);
/* Workaround for clearing the RXCIF for XMEGA */
usart_rx_disable(CONF_ILI9341_USART_SPI);
# else
usart_spi_read_single(CONF_ILI9341_USART_SPI, &data);
# endif
#elif defined(CONF_ILI9341_SPI)
spi_write_single(CONF_ILI9341_SPI, 0xFF);
ili9341_wait_for_send_done();
/* Wait for RX to complete */
while (!spi_is_rx_full(CONF_ILI9341_SPI)) {
/* Do nothing */
}
spi_read_single(CONF_ILI9341_SPI, &data);
#endif
return data;
}
