Hello, everyone,

We met with a problem about the connection between the chip and DAS. The chip we use is XC2224L, VQFN package. DAP connector of DAP miniwiggler. The schematic refers to the Easy Kit XC2XXX. The DAS can not recognize the chip. Memtool 4.4 was also tested but failed.

Already connect 'TDO_A' to 470R then GND and '/TRST' to 2.74K to +5V.

While connecting, 'RESET' is high. '/PORST' is high.

Do you have any idea about that?

Thanks. Show Less

Hi,

I have been trying to get the SPI working on a XC2734 chip to read a eeprom.
Problems i have is with receiving the data, the RBUF always stays 0x00 and never changes.

Check data with a scope and on the MISO input line i see data and it is changing on different address reads.
But RBUF always returns 0x00.

P10.0 Data input MISO
P10.1 Data output MOSI
P10.2 Clock
P10.8 CS

 

void EEPROM_test()
{

char recValue = '0';

U0C0_PCRL = 0x0F4F;

P10_OMRH = 0x0100; // P10.8 CS Output Low

U0C0_SCTRH = 0x071F; // Sets frame length on 4 byte

vSendData1(0x03);

vSendData1(0x01);
vSendData1(0xD0);

vSendData1(0xFF);

recValue = uwGetData();
//recValue = U0C0_RBUF;

P10_OMRH = 0x0001; // P10.8 CS Output High

}

 

void vSendData1(uword uwData)
{

U0C0_TBUF00 = uwData; // load transmit buffer register
while(!(U0C0_PSR & 0x1000)); // wait until tx buffer indication flag is set
U0C0_PSCR |= 0x1000; // clear transmit buffer indication flag

}

 

uword uwGetData(void)
{
while(!((U0C0_PSR & 0x8000) || (U0C0_PSR & 0x4000)));

U0C0_PSCR |= 0xC000; // clear alternate receive indication flag & receive indication flag
return U0C0_RBUF; // return receive buffer register
}

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