SPIM3 not work standalone.

[loquat]

nRF52804 SPIM3 not work.
(SCLK/MOSI not output)

However, if I debug it using jlink, it works. 

My environment is
nRF52840-DK(PCA10056/v1.0.0)
nRF52 SDK 17.0.2

My program is

	/* SCK */
	nrf_gpio_pin_clear(SPIM_CLK_PIN);
	nrf_gpio_cfg(SPIM_CLK_PIN,
						NRF_GPIO_PIN_DIR_OUTPUT,
						NRF_GPIO_PIN_INPUT_CONNECT,
						NRF_GPIO_PIN_NOPULL,
						NRF_GPIO_PIN_S0S1,
						NRF_GPIO_PIN_NOSENSE);
	/* MOSI */
	nrf_gpio_pin_clear(SPIM_MOSI_PIN);
	nrf_gpio_cfg_output(SPIM_MOSI_PIN);
	/* MISO */
	nrf_gpio_cfg_input(SPIM_MISO_PIN, (nrf_gpio_pin_pull_t)NRFX_SPIM_MISO_PULL_CFG);
	/* SS */
	nrf_gpio_pin_set(SPIM_SS_PIN);
	nrf_gpio_cfg_output(SPIM_SS_PIN);

	/**/
    NRFX_IRQ_DISABLE(TARGET_SPIM_IRQ);
	SpimReg.ENABLE = SPIM_ENABLE_ENABLE_Enabled << SPIM_ENABLE_ENABLE_Pos;
	SpimReg.TASKS_STOP = 1;
	SpimReg.PSEL.SCK = SPIM_CLK_PIN;
	SpimReg.PSEL.MOSI = SPIM_MOSI_PIN;
	SpimReg.PSEL.MISO = SPIM_MISO_PIN;
	SpimReg.FREQUENCY = SPIM_FREQUENCY_FREQUENCY_K125;
	SpimReg.RXD.PTR = uint32_t(m_recv_buff),
	SpimReg.RXD.MAXCNT = 2;
	SpimReg.RXD.LIST = 0;
	SpimReg.TXD.PTR = uint32_t(m_send_buff),
	SpimReg.TXD.MAXCNT = 2;
	SpimReg.TXD.LIST = 0;
	SpimReg.CONFIG = 0; /* active-high / Leading / MsbFirst */
	SpimReg.ORC = 0x00;
	
	SpimReg.EVENTS_END = 0;
	SpimReg.TASKS_START = 1;
	while ( SpimReg.EVENTS_END == 0);

EVENT_END is done.(Maybe the process is finished )
But SCLK and MOSI not output.

[Susheel Nuguru]

running your code as it is except one line change makes it work normally on my end.

I only changed this as I do not want to test the dcx line on my end.

        //APP_ERROR_CHECK(nrfx_spim_xfer_dcx(&spi, &xfer_desc, 0, 15));
        APP_ERROR_CHECK(nrfx_spim_xfer(&spi, &xfer_desc, 0));

Output is as expected

Check this without the dcx to see if that is the issue, i see no other faults as it is working as expected on the DK

[Susheel Nuguru]

Ok Wait, I see that I am not getting the event callback something is wrong at my end, I might have not connected the pins correct. I will be back with more testing

[loquat]

Did you get results?

[Susheel Nuguru]

Hi, I am sorry, that i did not get a chance to test this as i was away due to covid.

I will ask my colleague to help me test this.

[Susheel Nuguru]

Hi,

I am sorry for late response.

I added the below code in nRF5_SDK_17.0.2_d674dde\integration\nrfx\legacy\apply_old_config.h

#if NRFX_CHECK(NRFX_SPIM3_ENABLED)
    #define NRF_DRV_SPI_INSTANCE_3 \
        { 2, { .spim = NRFX_SPIM_INSTANCE(3) }, true }
#elif NRFX_CHECK(NRFX_SPI3_ENABLED)
    #define NRF_DRV_SPI_INSTANCE_2 \
        { 2, { .spi = NRFX_SPI_INSTANCE(2) }, false }
#endif

and enabled NRFX_SPIM3_ENABLED in sdk_config.h and everything on my end is working ok. tested it by connecting two boards with SPI and SPIS examples in nRF5_SDK_17.0.2_d674dde\examples\peripheral\

[loquat]

I added the code to apply_old_config.h and added NRFX_SPIM3_ENABLED to sdk_config.h.
However, SPI does not work properly.

I think there is a serious clock problem with SPIM3.
I would like more research.

[Susheel Nuguru]

Please test the SPIM with the examples I tested with.

loquat said:

I think there is a serious clock problem with SPIM3.
I would like more research.

That looks like drive issues, I think the examples do not set high drive, so maybe try something like this after initialisation on all SCK CS and MOSI pins 

    nrf_gpio_cfg(SCK_1_PIN,
                 NRF_GPIO_PIN_DIR_OUTPUT,
                 NRF_GPIO_PIN_INPUT_DISCONNECT,
                 NRF_GPIO_PIN_NOPULL,
                 NRF_GPIO_PIN_H0H1,       // Require High Drive low & high levels
                 NRF_GPIO_PIN_NOSENSE

[loquat]

Take a look at the sample project I uploaded.

/cfs-file/__key/communityserver-discussions-components-files/4/8867.ble_5F00_app_5F00_hrs_5F00_freertos.zip

This project uses nrfx_spim_init ().
I'm not using nrf_gpio_cfg ().

[Susheel Nuguru]

Your application was asserting due to lack of stack memory for taskSpim task. When i increased the task size a bit  like this

	xTaskCreate(taskSpim, "spim", 1024, 0, 1, &xHandle);

Then everything works as intended.

[loquat]

No, it's not.
I will write it again.

SPIM's CLK / MOSI is normal when the debugger is enabled.
When the debugger is disabled, SPIM's CLK / MOSI will not be output.

Please find out what's going on.