Linux driver for nRF7002

[kaushalyasat]

Hi,

I am evaluating the nRF7002 to be used as a host based WiFi MAC/PHY. My host is TI AM3358. The Linux version we use is 4.1.15. 

1. Is it possible to use the nRF7002 for this purpose?

2. I couldn't find any Linux drivers for this except https://github.com/NordicPlayground/nrf70-linux-driver. I tried building this but west fails.

Cheers,

Kaushalya

[Alan Low]

Hi,

I am currently porting the nrf7002 Linux driver from NordicPlayground to work with (NXP iMX6ULL + nRF7002 EK) using normal SPI interface.

1) The RDSR1, RDSR2 and WRSR2 commands work fine but not FAST READ (0x0B). I am using 16MHz SPI clock and SPI slave latency set to 1. It always returns 0xFFFFFFFF when trying to read data from offset 0x400.

2) I see from the code that for PP command, the address MSBit is set to 1. Is that any reason to do so? 

/***************************************************************************************/

static int _spdev_write(unsigned long addr, unsigned int val, unsigned int len)
{
      int err;
      struct spi_device *spi_dev = config->dev;
      uint8_t hdr[8] = {
           0x02, /* PP opcode */
          (((addr >> 16) & 0xFF) | 0x80),
          (addr >> 8) & 0xFF,
          (addr & 0xFF),
          (val & 0xFF),
          ((val >> 8) & 0xFF),
          ((val >> 16) & 0xFF),
          ((val >> 24) & 0xFF),
     };
     struct spi_transfer tr = { .tx_buf = hdr, .len = sizeof(hdr) };
     struct spi_message m;

     spi_message_init(&m);
     spi_message_add_tail(&tr, &m);

     err = spi_sync(spi_dev, &m);
     if (err < 0) {
         pr_err("%s: SPI error: %d\n", __func__, err);
     }

     return err;
}

/***************************************************************************************/

Hope I can get some response although I understand that this code is not officially supported by Nordic. Thanks!