SPI Core

I have the same problem. I want to read in an ADC (LTC2351-14). I modifiet the altera_spi_hal to my needs but i only see 8 clks when i look at the signale on a osci. I tried both, reading the reg directly and using the altera cmd.

here is the modified code:

# include "alt_types.h"# include "altera_spi_regs.h"# include "altera_spi.h"

int alt_avalon_command(alt_u32 base, alt_u32 slave,

alt_u32 write_length, const alt_u16 * write_data,

alt_u32 read_length, alt_u16 * read_data,

alt_u32 flags)

{

const alt_u16 * write_end = write_data + write_length;

alt_u16 * read_end = read_data + read_length;

alt_u32 write_zeros = read_length;

alt_u32 read_ignore = write_length;

alt_u32 status;

alt_32 credits = 1;

IOWR_ALTERA_AVALON_SPI_SLAVE_SEL(base, 1 << slave);

if ((flags & ALT_AVALON_SPI_COMMAND_TOGGLE_SS_N) == 0) {

IOWR_ALTERA_AVALON_SPI_CONTROL(base, ALTERA_AVALON_SPI_CONTROL_SSO_MSK);

}

IORD_ALTERA_AVALON_SPI_RXDATA(base);

for ( ; ; ){

do{

status = IORD_ALTERA_AVALON_SPI_STATUS(base);

}

while (((status & ALTERA_AVALON_SPI_STATUS_TRDY_MSK) == 0 || credits == 0) &&

(status & ALTERA_AVALON_SPI_STATUS_RRDY_MSK) == 0);

if ((status & ALTERA_AVALON_SPI_STATUS_TRDY_MSK) != 0 && credits > 0){

credits--;

if (write_data < write_end)

IOWR_ALTERA_AVALON_SPI_TXDATA(base, *write_data++);

else if (write_zeros > 0)

{

write_zeros--;

IOWR_ALTERA_AVALON_SPI_TXDATA(base, 0);

}

else

credits = -1024;

};

if ((status & ALTERA_AVALON_SPI_STATUS_RRDY_MSK) != 0){

alt_u32 rxdata = IORD_ALTERA_AVALON_SPI_RXDATA(base);

if (read_ignore > 0)

read_ignore--;

else

*read_data++ = (alt_u16)rxdata;

credits++;

if (read_ignore == 0 && read_data == read_end)

break;

}

}

do{

status = IORD_ALTERA_AVALON_SPI_STATUS(base);

}

while ((status & ALTERA_AVALON_SPI_STATUS_TMT_MSK) == 0);

if ((flags & ALT_AVALON_SPI_COMMAND_MERGE) == 0)

IOWR_ALTERA_AVALON_SPI_CONTROL(base, 0);

return read_length;

}