SPIM 3 at 16MHz

RE: SPIM 3 at 16MHz

Einar Thorsrud — Mon, 22 Oct 2018 09:34:41 GMT

I have not been able to reproduce this on my side. I have modified the SDK 15.2 SPI example to use SPIM3 and the nrfx driver and 16 MHz, and this works as expected on my side.

This is my main.c and sdk_config.h file:

devzone.nordicsemi.com/.../main.c

devzone.nordicsemi.com/.../sdk_5F00_config.h

Can you upload your full source code including sck_config.h so that we can compare?

RE: SPIM 3 at 16MHz

siri sam — Fri, 19 Oct 2018 09:01:24 GMT

when I set SPIM at 16Mz, there is no clk generated anymore but the firmware is still running background.

RE: SPIM 3 at 16MHz

Einar Thorsrud — Fri, 19 Oct 2018 08:20:51 GMT

I see. What happens when you set "config.frequency = NRF_SPIM_FREQ_16M;" this instead? In what way does things fail?

RE: SPIM 3 at 16MHz

siri sam — Fri, 19 Oct 2018 07:50:46 GMT

We are using the SDK 15, I'm now migrating to the 15.2. The device work fine at 8Mhz but to optimize our device, we need to go up to 16Mhz.

here is the init part in our code :

void init_spi() {

// CS output
nrf_gpio_cfg_output(SPI_CS);

nrfx_spim_config_t config = NRFX_SPIM_DEFAULT_CONFIG;

config.sck_pin = SPI_SCK;
config.miso_pin = SPI_MISO;
config.mosi_pin = SPI_MOSI;
config.rx_delay = 2;
config.frequency = NRF_SPIM_FREQ_8M; // max working frequency
config.irq_priority =2;

config.mode = NRF_SPIM_MODE_0;

nrf_gpio_cfg_default(IO_NAND_IO0);
nrf_gpio_cfg_default(IO_NAND_IO1);
nrf_gpio_cfg_output(IO_NAND_IO2);
nrf_gpio_cfg_output(IO_NAND_IO3);
nrf_gpio_pin_write(IO_NAND_IO2, 1);
nrf_gpio_pin_write(IO_NAND_IO3, 1);

uint32_t err_code = nrfx_spim_init(&m_spi, &config, spi_event_handler, NULL);

}

Thanks for your help

RE: SPIM 3 at 16MHz

Einar Thorsrud — Fri, 19 Oct 2018 07:21:58 GMT

I see, then all should be good. Can you let me know which SDK you are using and how you have configured and are using the SPIM3 peripheral? Seeing your code would be helpful. In what way does it not work?

RE: SPIM 3 at 16MHz

siri sam — Fri, 19 Oct 2018 07:05:10 GMT

We are using the revision 1. We also have some revision B but as it is describe on some other thread it seems to works with this one too no?

Anyway all our product are with the final revision.

RE: SPIM 3 at 16MHz

Einar Thorsrud — Fri, 19 Oct 2018 06:40:22 GMT

Fast SPIM is only functional on the final silicon. Are you using a engineering sample (for instance preview DK) or do you have revision 1? (What is the marking on the chip?)

RE: SPIM 3 at 16MHz

siri sam — Thu, 18 Oct 2018 11:36:14 GMT

Hello,

I have seen the thread about the SPIM3->IFTIMING.RXDELAY and i've set it to 2 but it doesn't work either. Do you have more information about how I should adapt the driver? I have activated the anomaly 198 workaround but no success.

RE: SPIM 3 at 16MHz

Einar Thorsrud — Fri, 05 Oct 2018 10:32:06 GMT

Hi,

There is no example of SPIM3 with speeds > 8 MHz. It is supported by the HW, but you have to adapt the driver slightly as it only supports up to 8 MHz. Note that that you should read the errata list if you use SPIM3 as there is quite a few issues with it.

RE: SPIM 3 at 16MHz

hmolesworth — Thu, 04 Oct 2018 15:20:15 GMT

Have a look at this link, it might help. Also search for SPIM3 for more ..