TMS320F28069 SPI Interrupt

Sagar, this is some kind of configuration issue!

Please check all your initialization steps.

Regards,

Gautam

Hi Gautam,

In Initialization I am only disable the loopback mode.Also the SPISTEA pin is low for all time.It should be Toggle after 8bit clk.

// Initialize SPI FIFO registers

SpiaRegs.SPICCR.bit.SPISWRESET=0; // Reset SPI

SpiaRegs.SPICCR.all = 0x0047; //8-bit character, Loopback mode disable ,CLK PHA Enable
SpiaRegs.SPICTL.all = 0x001F; //Interrupt enabled, Master/Slave XMIT enabled
SpiaRegs.SPISTS.all = 0x0000;
SpiaRegs.SPIBRR = 0x0063; // Baud rate
SpiaRegs.SPIFFTX.all = 0xC022; // Enable FIFO's, set TX FIFO level to 4
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;

Hello,

The SPI will receive data every time a transmission is made whether there is any "data" being sent to the pin or not.  Each time the clock is looking for received data it will shift in whatever value is on the SPI RX buffer.  So even though no data is being sent to the device, it is still shifting in a value and thinking it received something.  If you look at the SPIRXBUF it is probably 0x0 or 0xFFFFFFFF depending if the pin is low or high.

Kris