issue about setting of DM368 spi setup time and hold time

stevenyin

Hi all:

We are use DM368 spi2 to communicate with one MCU, base on the IPNC 3.1 RDK , when short connect SPI2_SOMI and SPI2_SIMO pins, then run the spi test tool, it works ok.

But Waveform in osciloscope looks there is no setup time and hold time, we have set CSHOLD = 0, timer_disable = 0, and add "iowrite32(0 | (8<< 24) | (8 << 16), davinci_spi->base + SPIDELAY);" in the "dvsdk_ipnctools\ipnc_psp_2_10_00_14\ti-davinci\drivers\spi\davinci_spi_master.c" file.

why the tC2TDELAY and tT2CDELAY are 0 on the waveform? we have read the driver code and spi datasheet for long time, but still can not fix the problem!!!

thanks

REGARDS

Steven

over 10 years ago

0 Cvetolin Shulev-XID over 10 years ago

TI__Guru 65405 points

Moving to DM3x DaVinci Video Processor Forum.

BR
Tsvetolin Shulev

0 Cvetolin Shulev-XID over 10 years ago

TI__Guru 65405 points

Hi Steven,

Could you check the value of 'davinci_spi->base'? Is it corresponds to SPI0 base address but you trying to configure SPIDELAY of SPI2 interface.

BR
Tsvetolin Shulev

0 stevenyin over 10 years ago in reply to Cvetolin Shulev-XID

Intellectual 440 points

Hi Shulev:

Thanks for your reply, 'davinci_spi->base' is point to 0x01C6 7800, this is correct.

I found if I add debug code :

       for(i=0; i<101; i=i+4) {
            ret = ioread32(davinci_spi->base + i);
            printk("*********reg %x = %x   *********\n", i, ret);
            udelay(100);
       }

on top of the "ret = spi_bitbang_start(&davinci_spi->bitbang);" in the "static int davinci_spi_probe(struct device *d)",

the read value of SPIDELAY is 0("*********reg 48= 0 ********* ). it is so strange.

Steven

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issue about setting of DM368 spi setup time and hold time