Part Number: LAUNCHXL-F28069M
Hi,
Interfacing a SPI LCD to SPIA, few things that confuses me.
1. SPISTEA
Should this be controlled by the SPI Master F28069 ? I understand it implies SPI Slave Transmit Enable A. Is it really useful in the master mode ?
2. SPI Character Length
For the ILI9341, should this be 8bits, or should it be 16 bits ? Slightly lost on this.
At the moment, I am using the following SPI configuration:
void setup_spi(void)
{
SpiaRegs.SPICCR.bit.SPISWRESET = 0; /* Reset SPI */
SpiaRegs.SPIPRI.bit.TRIWIRE = 0; /* SPI 4 wire MODE enabled */
SpiaRegs.SPICCR.bit.SPICHAR = 0xf; /* 16 bits */
SpiaRegs.SPICCR.bit.CLKPOLARITY = 0; /* CPOL = 0 */
SpiaRegs.SPICTL.bit.MASTER_SLAVE = 1; /* Master */
SpiaRegs.SPICTL.bit.CLK_PHASE = 0; /* CPHA = 0, normal mode */
SpiaRegs.SPICTL.bit.TALK = 1; /* enable transmission */
SpiaRegs.SPISTS.all = 0x0000; /* clear status flags */
SpiaRegs.SPIBRR = 0x0063; /* Baud Rate */
SpiaRegs.SPIFFTX.bit.SPIFFENA = 1; /* FIFO enhancement enabled */
SpiaRegs.SPIFFTX.bit.SPIRST = 1; /* FIFO can resume Rx/Tx */
SpiaRegs.SPIFFCT.all = 0x00; /* no delays */
SpiaRegs.SPIPRI.bit.FREE = 1; /* Free run */
SpiaRegs.SPICCR.bit.SPISWRESET = 1; /* Enable SPI */
SpiaRegs.SPIFFTX.bit.TXFIFO = 1; /* Re enable TX FIFO */
SpiaRegs.SPIFFRX.bit.RXFIFORESET = 1; /* Re enable RX FIFO */
}
/**
* ILI9341 <--> LAUNCHXL-F28069M interconnect
* ILI9341 LAUNCHXL-F28069M InitSpiaGpio
* -------------------------------------------------------------
* SDO(MISO) J2(14) 1SPI_SO (GPIO17) (SPISOMIA)
* LED J4(34) GPIO (GPIO13)
* SCK J1(7) 1SPI_CLK (GPIO18) (SPICLKA)
* SDI(MOSI) J2(15) 1SPI_SI (GPIO16) (SPISIMOA)
* DC J2(18) GPIO (GPIO44)
* RESET J1(8) GPIO (GPIO22)
* CS J2(19) 1SPI_CS (GPIO19) (SPISTEA)
* GND
* VCC
*/
void lcd_cmd(Uint16 cmd)
{
Uint16 tmp;
GpioDataRegs.GPBSET.bit.GPIO44 = 1; /* enable D/C pin */
SpiaRegs.SPITXBUF = cmd; /* master TX data */
while (SpiaRegs.SPISTS.bit.INT_FLAG != 1);
tmp = SpiaRegs.SPIRXBUF; /* Clear self received data */
}
Any thoughts/suggestions ?
Thanks,
Manu
