MISO Pin not working properly in SPIS mode

[AhmedPs19]

Hello,

I am using a custom NRF5340 board and trying to run SPIS related code. The issue I am facing is that MISO pin kept low during the complete transaction . My pin configurations are following

#define APP_SPIS_CS_PIN             NRF_GPIO_PIN_MAP(1 , 6)
#define APP_SPIS_MISO_PIN           NRF_GPIO_PIN_MAP(0 , 19)
#define APP_SPIS_MOSI_PIN           NRF_GPIO_PIN_MAP(0 , 21)

#define APP_SPIS_SCK_PIN           NRF_GPIO_PIN_MAP(1 , 4)

Please advise me what can be the cause of this issue. I have test the same code on NRF5340 dk with different pins it was working fine.

Regards

Ahmed

[AhmedPs19]

One thing I would like to add is that I have confirmed that NRF5340 is sampling MOSI data correctly with the help of breakpoints and Segger Jlink. SPIS registers are correctly setting but due to some reason MISO pin is not outputting the loaded buffer , it just remains low throughout the whole transaction.

I kindly request your advice on this matter, as we are pressed for time. A quick response would be greatly appreciated.

Kind Regards,

Ahmed

[Naeem Maroof]

Hello,

Thank you for contacting DevZone at NordicSemi.

As the problem does not occur with the DK, I doubt there could be problem with your board.

How many custom boards do you have? All are showing the same problem?

How does your overlay look like?

Maybe you can revisit your board, and check everything including device-tree and the connections are correct.

BR,

Naeem

[AhmedPs19]

Hello Naeem,

Following are the contents of the conf file

CONFIG_BOARD_ENABLE_DCDC_APP=n
CONFIG_BOARD_ENABLE_DCDC_NET=n
CONFIG_BOARD_ENABLE_DCDC_HV=n
CONFIG_LOG=n
CONFIG_NRFX_SPIS1=y
CONFIG_BOOT_BANNER=n
CONFIG_ASSERT=y
CONFIG_SPEED_OPTIMIZATIONS=n
CONFIG_ZERO_LATENCY_IRQS=y
CONFIG_BUILD_WITH_TFM=n

CONFIG_PRINTK=n

CONFIG_BOARD_ENABLE_CPUNET=y
CONFIG_MBOX_NRFX_IPC=y
CONFIG_IPC_SERVICE=y
CONFIG_IPC_SERVICE_BACKEND_ICMSG=y
CONFIG_MBOX=y

CONFIG_LOG=n
CONFIG_ASSERT=y

--------------------------------------------------------------------------

Following are the contents of the overlay file

&spi1 {
    status = "okay";
    compatible = "nordic,nrf-spis";
    def-char = <0xFF>;
};

/{
    chosen {
        /delete-property/ zephyr,ipc_shm;
    };

    reserved-memory {
        /delete-node/ memory@20070000;

        sram_rx: memory@20070000 {
            reg = <0x20070000 0x0800>;
        };

        sram_tx: memory@20078000 {
            reg = <0x20078000 0x0800>;
        };
    };

    ipc {
        /delete-node/ ipc0;

        ipc0: ipc0 {
            compatible = "zephyr,ipc-icmsg";
            tx-region = <&sram_tx>;
            rx-region = <&sram_rx>;
            mboxes = <&mbox 0>, <&mbox 1>;
            mbox-names = "rx", "tx";
            status = "okay";
        };
    };
};

----------------------------------------------------------------------------------------------------------------------------------

code spinet from main.c file

#define SPIS_INST_IDX 1

void * p_context = "Some context";

nrfx_spis_t spis = NRFX_SPIS_INSTANCE(SPIS_INST_IDX);

    nrfx_spis_config_t spis_config = NRFX_SPIS_DEFAULT_CONFIG(APP_SPIS_SCK_PIN,

                                                              APP_SPIS_MOSI_PIN,

                                                              APP_SPIS_MISO_PIN,

                                                              APP_SPIS_CS_PIN);

//   spis_config.miso_drive= NRF_GPIO_PIN_H0H1;                                              

 spis_config.irq_priority = 2 ;

 spis_config.miso_drive = NRF_GPIO_PIN_H0H1 ;

spis_config.skip_gpio_cfg = 0 ;

spis_config.skip_psel_cfg = 0 ;

NRF_SPIS1->ENABLE = (SPIS_ENABLE_ENABLE_Disabled << SPIS_ENABLE_ENABLE_Pos);

status = nrfx_spis_init(&spis, &spis_config, spis_handler, p_context);

     NRFX_ASSERT(status == NRFX_SUCCESS);

#define SPIS_INST         NRFX_CONCAT_2(NRF_SPIS, SPIS_INST_IDX)

#define SPIS_INST_HANDLER NRFX_CONCAT_3(nrfx_spis_, SPIS_INST_IDX, _irq_handler)

IRQ_DIRECT_CONNECT(NRFX_IRQ_NUMBER_GET(SPIS_INST), IRQ_PRIO_LOWEST, SPIS_INST_HANDLER, 0)

Kind Regards,

Ahmed

[AhmedPs19]

Hello Naeem,

I have changed the MISO pin from P0.19 to P0.13 and the issue is resolved but I want to further investigate what could be cause of this issue. I have checked the bare boards , there is no hardware issue in the custom boards. 

Best Regards,

Ahmed

[Naeem Maroof]

Hello Ahmed,

Good to know that you have made progress and somehow the issue is resolved.

I can see that you have set MISO pin (Pin 0.19) configuration as H0H1 drive.

spis_config.miso_drive = NRF_GPIO_PIN_H0H1 ;

From the product specification, we see that P0.13 - P0.18 should be used for H0H1 drive configuration from the Pin assignment chapter of nrf5340 product specification.

BR, Naeem

[AhmedPs19]

Naeem Maroof said:

specification

I have tried it in both ways , i.e in H0H1 and S0S1 . Nothing worked on P0.19.

Regards,

Ahmed