nrf9160 spi error - 5.

[ephraim]

Dear Sir.

I am using Master SPI to drive 2 slaves.

Both spi are referenced within Interrupt routine ,

When both spi;s slave are referenced I get an error 

err = spi_transceive(spi_dev3, &spi_cfg_afe4900, &tx, &rx);

if (err) {
printk("SPI error: %d\n", err);
}

Errro = -5 .

The spi is configured as follows.

&spi3 {
status = "okay";
compatible = "nordic,nrf-spim";
sck-pin = <31>;
mosi-pin = <9>;
miso-pin = <30>;
cs-gpios = <&gpio0 26 1>,<&gpio0 15 1>;
};

// Main.

struct spi_cs_control afe4900_spi_cs = {
.gpio_pin = 26 , /*CS_PIN_NUM(CONFIG_ST25R3911B_SPI_PORT), */
.delay = 1, /* 8T_NCS_SCLK */
};

struct spi_config spi_cfg_afe4900 = {
.operation = SPI_OP_MODE_MASTER | SPI_WORD_SET(8) | SPI_TRANSFER_MSB |
SPI_MODE_CPOL | SPI_MODE_CPHA ,
.frequency = 7000000,
.slave = 0,
.cs = &afe4900_spi_cs,
};

struct spi_cs_control flash_spi_cs = {
.gpio_pin = 15 , /*CS_PIN_NUM(CONFIG_ST25R3911B_SPI_PORT), */
.delay = 1, /* 8T_NCS_SCLK */
};

struct spi_config spi_cfg_flash = { // ****** NOTICE ME! ********
.operation = SPI_OP_MODE_MASTER | SPI_WORD_SET(8) | SPI_TRANSFER_MSB |
SPI_MODE_CPOL | SPI_MODE_CPHA ,
.frequency = 7000000,
.slave = 0,
.cs = &flash_spi_cs,
};

// Init.

afe4900_spi_cs.gpio_dev = device_get_binding("GPIO_0");
afe4900_spi_cs.gpio_pin = 26;
afe4900_spi_cs.delay = 0;

flash_spi_cs.gpio_dev = device_get_binding("GPIO_0");
flash_spi_cs.gpio_pin = 15;
flash_spi_cs.delay = 0;

// Interrupt

         SPI_read_continuous(0x2a,2);   ( cs == 26 )
         flash_page_counter += afe4900_mem_chunk;

        if(afe4900_int_counter == 30)
        {
            MT25qlxx_WriteEnable();   ( cs == 15 )
            Wait4EraeWrite();               ( cs == 15 )
        }

       if(++afe4900_int_counter >= 40)
       {

             MT25qlxx_WriteFullPage(&flash_buffer[flash_bank][flash_section_counter * 0x100],0);    ( cs == 15 )

      }

Onle when  one slave is enabled   cs == 26 or cs == 15 , I do not get the error -5.

What  is the meaning of it ?.

Thanks

[Hakon]

When both spi;s slave are referenced I get an error 

 What do you mean by this? Are you trying to read/write to two slaves at the same time?

[ephraim]

Hi.

Both Spi slaves are referenced within an interrupt.

One after another . There is no time collision.  See the afe49p00_inetrrupt

[Hakon]

So when do you get the error? After the second interrupt?

[ephraim]

Hi.

I get an error after the first Interrupt.

[Hakon]

Onle when  one slave is enabled   cs == 26 or cs == 15 , I do not get the error -5.

 Can you please do a logic trace of the cs pins and data bus in both the case where it works and when it doesn't work?

[ephraim]

Hi.

I have found the problem , still need help to fix it.

When SPI CS = 26 IS ALONE 

The cs length is 30 Usec. see pic 52 

cs

when SPI withe both cs is applied . 

The CS = 26 length is down to 4.2 u .  see pic 50 

In prj.conf 

#CONFIG_SPI_ASYNC = y

If I comment out  to  

CONFIG_SPI_ASYNC = y   or CONFIG_SPI_ASYNC = n

I get out of board error.

Please Advise

[Hakon]

Are you sending the same data every time? It would be really helpful if you could also provide the logic trace with all the pins (MISO and MOSI as well). Also, is pic 52 the top one and pic 50 the bottom one?