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Hi,
We want to use TMS320F28377D SPI Slave mode.
We already set as SPI Master with NXP ARM MCU(mk60xxxx).
If We set sclk - 15KHz , it work normal.
But if we set scl - 50KHz or higher than 50KHz, (ex 1MHz), it do not work...
I think Slave can not accept high sclk. because MISO data corrupted at some sclk (between 15KHz and 50KHz).
Please help me~
This is Slave code.
// 9.1 Idle Loop
for(;;) // Just sit and loop forever
{
BackTicker++;
while(SpiaRegs.SPIFFRX.bit.RXFFST !=1) { }
Rdata = SpiaRegs.SPIRXBUF;
}
void spia_initialize()
{
// Initialize SPI FIFO registers
SpiaRegs.SPIFFTX.all = 0xE040;
SpiaRegs.SPIFFRX.all = 0x2044;
SpiaRegs.SPIFFCT.all = 0x0;
// Set reset low before configuration changes
// Clock polarity (0 == rising, 1 == falling)
// 16-bit character
// Disable loop-back
SpiaRegs.SPICCR.bit.SPISWRESET = 0;
SpiaRegs.SPICCR.bit.CLKPOLARITY = 0;
SpiaRegs.SPICCR.bit.SPICHAR = (16-1);
SpiaRegs.SPICCR.bit.SPILBK = 0;
// Enable master (0 == slave, 1 == master)
// Enable transmission (Talk)
// Clock phase (0 == normal, 1 == delayed)
// SPI interrupts are disabled
SpiaRegs.SPICTL.bit.MASTER_SLAVE = 0;
SpiaRegs.SPICTL.bit.TALK = 1;
SpiaRegs.SPICTL.bit.CLK_PHASE = 0;
SpiaRegs.SPICTL.bit.SPIINTENA = 0;
// Set the baud rate
SpiaRegs.SPIBRR.bit.SPI_BIT_RATE = ((200E6 / 4) / 500E3) - 1;
// Set FREE bit
// Halting on a breakpoint will not halt the SPI
SpiaRegs.SPIPRI.bit.FREE = 1;
// Release the SPI from reset
SpiaRegs.SPICCR.bit.SPISWRESET = 1;
}
// End of file.this is normal and abnormal(BLUE-MISO line do not working) scope
yellow - sclk
red - /cs
blue - MISO
green - MOSI
