void dmaStartFrameTransfer(int firstLine, int lastLine)
{
/* Get address of first line */
uint16_t *startAddr = FB_getActiveBuffer();
startAddr += firstLine * 10;
/* Create update command and address of first line */
uint16_t cmd = MEMLCD_CMD_UPDATE | ((firstLine+1) << 8);
/* Enable chip select */
GPIO_PinOutSet( pConf->scs.port, pConf->scs.pin );
/* Set number of lines to copy */
DMA->RECT0 = (DMA->RECT0 & ~_DMA_RECT0_HEIGHT_MASK) | (lastLine - firstLine);
/* Indicate to the rest of the program that SPI transfer is in progress */
spiTransferActive = true;
/* Send the update command */
USART_TxDouble(pConf->usart, cmd);
/* Start the transfer */
DMA_ActivateBasic(DMA_CHANNEL,
true, /* Use primary channel */
false, /* No burst */
(void *)&(pConf->usart->TXDOUBLE), /* Write to USART */
startAddr, /* Start address */
FRAME_BUFFER_WIDTH/16-1); /* Width -1 */
}
/**************************************************************************//**
* @brief Transmit data on the SPI interface.
*
* @param[in] data Pointer to the data to be transmitted.
* @param[in] len Length of data to transmit.
*
* @return EMSTATUS code of the operation.
*****************************************************************************/
EMSTATUS PAL_SpiTransmit (uint8_t* data, unsigned int len)
{
EMSTATUS status = PAL_EMSTATUS_OK;
while (len>1)
{
/* Send only one byte if len==1 or data pointer is not aligned at a 16 bit
word location in memory. */
if ((len == 1) || ((unsigned int)data & 0x1))
{
USART_Tx( PAL_SPI_USART_UNIT, *(uint8_t*)data );
len --;
data ++;
}
else
{
USART_TxDouble( PAL_SPI_USART_UNIT, *(uint16_t*)data );
len -= 2;
data += 2;
}
}
/* Wait for transfer to finish */
while (!(PAL_SPI_USART_UNIT->STATUS & USART_STATUS_TXC)) ;
return status;
}
void spi_write(spi_t *obj, int value)
{
if (obj->spi.bits <= 8) {
USART_Tx(obj->spi.spi, (uint8_t) value);
} else if (obj->spi.bits == 9) {
USART_TxExt(obj->spi.spi, (uint16_t) value & 0x1FF);
} else {
USART_TxDouble(obj->spi.spi, (uint16_t) value);
}
}
