Other Parts Discussed in Thread: ADS1298
Hello,
I`ve started to operate F28069(Piccolo) for control ADS1298.
When I tried to operate ADS1298 using F28069 by SPI, I recieved what I had sent to ADS1298 by TX Buffer.
It looked like a loopback mode, so I checked Loopback mode. However, it was loopback disable.
I tried changing POL & PHA but it was ineffective.
In my setting, I use RX Interrupt to recieve data, and just send data to TX Buffer.
I think I rule the MCU to obey Clock formation that ADS1298 needed(POL=0, PHA=1).
Here is my code that makes the issue.
void main(void)
{
InitSysCtrl();
InitSpiaGpio();
DINT;
IER = 0x0000;
IFR = 0x0000;
InitPieCtrl();
InitPieVectTable();
EALLOW; // This is needed to write to EALLOW protected registers
PieVectTable.SPIRXINTA = &spiRxFifoIsr;
PieVectTable.SPITXINTA = &spiTxIsr;
EDIS; // This is needed to disable write to EALLOW protected registers
// ADS1298 POR setting is Omitted
spi_xmit(0x11);
DELAY_US(100);
for(a=0;a<28;a++)// OP Code test Form
{
spi_xmit(0xF6);
DELAY_US(100);
}
for(;;)
{
}
}
void spi_xmit(Uint16 a)
{
SpiaRegs.SPITXBUF=a; // I`m not sure it would be a<<8; or not
}
void spi_fifo_init()
{
//POL=0, PHA=0
// Initialize SPI FIFO registers
SpiaRegs.SPICCR.bit.SPISWRESET=0; // Reset SPI
SpiaRegs.SPICCR.all=0x0007; //8-bit character, POL=0
SpiaRegs.SPICTL.all=0x0017; //Interrupt enabled, Master/Slave XMIT enabled, Phase Normal
SpiaRegs.SPISTS.all=0x0000;
SpiaRegs.SPIBRR=0x007F; // Baud rate
SpiaRegs.SPIFFTX.all=0xC002; // Enable FIFO's, Disable TXFIFO int
SpiaRegs.SPIFFRX.all=0x0022; // Set RX FIFO level to 4
SpiaRegs.SPIFFCT.all=0x00;
SpiaRegs.SPIPRI.all=0x0010;
SpiaRegs.SPICCR.bit.SPISWRESET=1; // Enable SPI
SpiaRegs.SPIFFTX.bit.TXFIFO=1;
SpiaRegs.SPIFFRX.bit.RXFIFORESET=1;
}
interrupt void spiTxIsr(void)
{
/**/
}
interrupt void spiRxFifoIsr(void)
{
rdata[i%length]=SpiaRegs.SPIRXBUF; // Read data
i++;
SpiaRegs.SPIFFRX.bit.RXFFOVFCLR=1; // Clear Overflow flag
SpiaRegs.SPIFFRX.bit.RXFFINTCLR=1; // Clear Interrupt flag
PieCtrlRegs.PIEACK.all|=0x20; // Issue PIE ack
}
Thank you,
Kim
