topic Re: Problem with SPI0 in LPCXpresso IDE

Problem with SPI0

lpcware — Thu, 16 Jun 2016 02:28:16 GMT

Content originally posted in LPCWare by furkan.yuksel on Wed Jun 08 05:21:20 MST 2011
Hi, I'm trying to control two spi devices using spi0 and spi1 ports. However, spi0 doesn't work even spi1 works correctly.

I switched devices on ports 0 and 1 and againg device which is connected to spi0 did not respond, but it was fine with spi1.

What can my problem be ?

Re: Problem with SPI0

lpcware — Thu, 16 Jun 2016 02:28:17 GMT

Content originally posted in LPCWare by furkan.yuksel on Wed Jun 08 05:30:52 MST 2011
Bytheway, I'm using lpcxpresso1114, sorry I forgot to mention.

Quote: furkan.yuksel
Hi, I'm trying to control two spi devices using spi0 and spi1 ports. However, spi0 doesn't work even spi1 works correctly.

I switched devices on ports 0 and 1 and againg device which is connected to spi0 did not respond, but it was fine with spi1.

What can my problem be ?

Re: Problem with SPI0

lpcware — Thu, 16 Jun 2016 02:28:17 GMT

Content originally posted in LPCWare by Ex-Zero on Wed Jun 08 05:37:22 MST 2011
Wrong hardware or wrong software :)

So how did you connect SPI0 and how did you init it?

Re: Problem with SPI0

lpcware — Thu, 16 Jun 2016 02:28:18 GMT

Content originally posted in LPCWare by furkan.yuksel on Wed Jun 08 05:47:42 MST 2011
I connected mt device to spi0 connections on board which is at leftenside of the board and cheched that these connections are connected to p0.2,6,8,9 and second device to spi1's port connections p2.0-3. I think my connections and hardware is ok, I suppose that I'm missing something while initialaing.

my initialization is:

SystemInit();
GPIOInit();
SSP_IOConfig(0);
SSP_Init(0);
SSP_IOConfig( 1);
SSP_Init( 1);

am I missing something here?

Quote: Zero
Wrong hardware or wrong software :)

So how did you connect SPI0 and how did you init it?

Re: Problem with SPI0

lpcware — Thu, 16 Jun 2016 02:28:18 GMT

Content originally posted in LPCWare by Ex-Zero on Wed Jun 08 05:55:42 MST 2011
Sorry, don't know what sample you are using and what

Quote:

SSP_IOConfig(0);
SSP_Init(0);

does :confused:

Re: Problem with SPI0

lpcware — Thu, 16 Jun 2016 02:28:19 GMT

Content originally posted in LPCWare by furkan.yuksel on Wed Jun 08 06:12:10 MST 2011
This is SSP example of eample projects from "lpcxpresso.examples.lpc1114.301" my spi1 is working fine so it must be enough to initialize spi. There must be anything special for spi0, can it be interrupted by something. UART ports are using same pins with spi0 but I never initialize UART.

are there any possibility that uart interrupts job of spi0 although I did not use uart?

Quote: Zero
Sorry, don't know what sample you are using and what

does :confused:

Re: Problem with SPI0

lpcware — Thu, 16 Jun 2016 02:28:20 GMT

Content originally posted in LPCWare by Ex-Zero on Wed Jun 08 06:24:06 MST 2011
There's nothing special about SPI0. You should use Peripherals View to control your IOCON and SSP0 settings.

They should match with your SSP_IOConfig values (especially if PIO0_2 is switched to SSEL0).

Re: Problem with SPI0

lpcware — Thu, 16 Jun 2016 02:28:20 GMT

Content originally posted in LPCWare by furkan.yuksel on Wed Jun 08 06:58:41 MST 2011

Quote: Zero
There's nothing special about SPI0. You should use Peripherals View to control your IOCON and SSP0 settings.

They should match with your SSP_IOConfig values (especially if PIO0_2 is switched to SSEL0).

I think that SSP_IOConfig function handles all IO configuration, here is the part of that function which configures spi0. Should I change something in there?

LPC_SYSCON->PRESETCTRL |= (0x1<<0);
    LPC_SYSCON->SYSAHBCLKCTRL |= (0x1<<11);
    LPC_SYSCON->SSP0CLKDIV = 0x02;            /* Divided by 2 */
LPC_IOCON->PIO0_8           &= ~0x07;    /* SSP I/O config */
LPC_IOCON->PIO0_8           |= 0x01;        /* SSP MISO */
LPC_IOCON->PIO0_9           &= ~0x07;
LPC_IOCON->PIO0_9           |= 0x01;        /* SSP MOSI */
#ifdef __JTAG_DISABLED
    LPC_IOCON->SCK_LOC = 0x00;
    LPC_IOCON->SWCLK_PIO0_10 &= ~0x07;
    LPC_IOCON->SWCLK_PIO0_10 |= 0x02;        /* SSP CLK */
#else
#if 0
    /* On HummingBird/Candiru 1(HB1/CD1), SSP CLK can be routed to different
    pins, other than JTAG TCK, it's either P2.11 func. 1 or P0.6 func. 2. */
LPC_IOCON->SCK_LOC = 0x01;
    LPC_IOCON->PIO2_11 = 0x01;    /* P2.11 function 1 is SSP clock, need to
                                combined with IOCONSCKLOC register setting */
#else
    LPC_IOCON->SCK_LOC = 0x02;
    LPC_IOCON->PIO0_6 = 0x02;    /* P0.6 function 2 is SSP clock, need to
                                combined with IOCONSCKLOC register setting */
#endif
#endif    /* endif __JTAG_DISABLED */

#if USE_CS
LPC_IOCON->PIO0_2 &= ~0x07;
LPC_IOCON->PIO0_2 |= 0x01;        /* SSP SSEL */
#else
    /* Enable AHB clock to the GPIO domain. */
    LPC_SYSCON->SYSAHBCLKCTRL |= (1<<6);

LPC_IOCON->PIO0_2 &= ~0x07;        /* SSP SSEL is a GPIO pin */
/* port0, bit 2 is set to GPIO output and high */
GPIOSetDir( PORT0, 2, 1 );
GPIOSetValue( PORT0, 2, 1 );
#endif

Re: Problem with SPI0

lpcware — Thu, 16 Jun 2016 02:28:21 GMT

Content originally posted in LPCWare by furkan.yuksel on Wed Jun 08 07:02:19 MST 2011
And also I attach the complete ssp driver "ssp.c" which I'm using.

Re: Problem with SPI0

lpcware — Thu, 16 Jun 2016 02:28:21 GMT

Content originally posted in LPCWare by Ex-Zero on Wed Jun 08 07:07:07 MST 2011

Quote:

Should I change something in there?

Are you configuring PIO0_2 as SSEL0 or GPIO ?

Is your Send / Receive code using PIO0_2 the same way?

Could be a good idea to control that via debugger and / or scope.

Re: Problem with SPI0

lpcware — Thu, 16 Jun 2016 02:28:22 GMT

Content originally posted in LPCWare by furkan.yuksel on Wed Jun 08 07:46:54 MST 2011

Quote: Zero
Are you configuring PIO0_2 as SSEL0 or GPIO ?

Is your Send / Receive code using PIO0_2 the same way?

Could be a good idea to control that via debugger and / or scope.

This ssp_init code configures PIO0_2 as GPIO output.

My send/receive code is in ssp.c file which I attached one message before. These send/receive functions works fine for spi1.

What do you mean by "conrtol that via debuger"?

Re: Problem with SPI0

lpcware — Thu, 16 Jun 2016 02:28:22 GMT

Content originally posted in LPCWare by Ex-Zero on Wed Jun 08 08:01:07 MST 2011
In SSP_Send / SSP_Receive there's nothing done to select your chip via GPIO. If you have switched PIO0_2 to GPIO you have to do it somewhere else.

Therefore I've suggested several times to control your PIO0_2 IOCON setting via Debugger -> Peripherals View -> IOCON.

Re: Problem with SPI0

lpcware — Thu, 16 Jun 2016 02:28:23 GMT

Content originally posted in LPCWare by furkan.yuksel on Wed Jun 08 08:07:00 MST 2011

Quote: Zero
In SSP_Send / SSP_Receive there's nothing done to select your chip via GPIO. If you have switched PIO0_2 to GPIO you have to do it somewhere else.

Therefore I've suggested several times to control your PIO0_2 IOCON setting via Debugger -> Peripherals View -> IOCON.

I'm selecting my chip with controlng SSEL. For example for port0:
        GPIOSetValue( PORT0, 2, 0 );
        SSP_Send( 0, &src_addr0, 2 );
        GPIOSetValue( PORT0, 2, 1 );

and first variable of sssp_send selects the sending port.

Re: Problem with SPI0

lpcware — Thu, 16 Jun 2016 02:28:23 GMT

Content originally posted in LPCWare by Ex-Zero on Wed Jun 08 08:21:13 MST 2011
So you have checked your IOCON setting for PIO0_2? It's really GPIO?

And you have scoped PIO0_2, it's really switching?

Re: Problem with SPI0

lpcware — Thu, 16 Jun 2016 02:28:24 GMT

Content originally posted in LPCWare by furkan.yuksel on Wed Jun 08 23:35:06 MST 2011

Quote: Zero
So you have checked your IOCON setting for PIO0_2? It's really GPIO?

And you have scoped PIO0_2, it's really switching?

I think you are right, I reilize that there is inconsistency on working of SSEL0 on P0.2. But I measured it and it was fine while printf functions are not in use, however, when I try to use printf P0.2 stays high all the time.

Re: Problem with SPI0

lpcware — Thu, 16 Jun 2016 02:28:25 GMT

Content originally posted in LPCWare by Ex-Zero on Thu Jun 09 00:31:12 MST 2011
Since you are not using SSEL0, it can't be a problem with it :)
And if PIO0_2 as GPIO is just used for chip select (= active low) your debugger and a few breakpoints can help you to see if there's happening something unexpected.
If it's high it just shows that SPI0 is not in use at the moment. And that's no surprise if printf is working...
I hope you don't use semihosting printf...

Re: Problem with SPI0

lpcware — Thu, 16 Jun 2016 02:28:25 GMT

Content originally posted in LPCWare by furkan.yuksel on Thu Jun 09 00:45:18 MST 2011

Quote: Zero
Since you are not using SSEL0, it can't be a problem with it :)
And if PIO0_2 as GPIO is just used for chip select (= active low) your debugger and a few breakpoints can help you to see if there's happening something unexpected.
If it's high it just shows that SPI0 is not in use at the moment. And that's no surprise if printf is working...
I hope you don't use semihosting printf...

Yes, actually I'm using semihosting printf. Why, can it cause problem to spi?

Re: Problem with SPI0

lpcware — Thu, 16 Jun 2016 02:28:26 GMT

Content originally posted in LPCWare by Ex-Zero on Thu Jun 09 01:10:29 MST 2011

Quote:

[U][B]Important notes about semihosting[/B][/U]

...it is normally advisable to[B][COLOR=Red] avoid the use[/COLOR][/B] of semihosting... :eek:

See:

http://support.code-red-tech.com/CodeRedWiki/UsingPrintf

So it's slow and bitchy and not made to use it in time critical programs :mad:

Re: Problem with SPI0

lpcware — Thu, 16 Jun 2016 02:28:26 GMT

Content originally posted in LPCWare by furkan.yuksel on Thu Jun 09 01:33:06 MST 2011

Quote: Zero
See:

http://support.code-red-tech.com/CodeRedWiki/UsingPrintf

So it's slow and bitchy and not made to use it in time critical programs :mad:

But even when I disable semihosting, it still does not work :( I cannot undertand what is wrong :( whatelse can efect the spi0 :(

Re: Problem with SPI0

lpcware — Thu, 16 Jun 2016 02:28:27 GMT

Content originally posted in LPCWare by Ex-Zero on Thu Jun 09 01:44:50 MST 2011

Quote: furkan.yuksel
....it still does not work :(...

So what is not working? What did you scope at your SPI0? What is your debugger doing while 'it still does not work'?

Perhaps you should post your project and let someone else solve your problem :confused: