Is there a problem with SPI communication of ncs1.9.0 SDK?

RE: Is there a problem with SPI communication of ncs1.9.0 SDK?

Einarh — Fri, 26 Aug 2022 08:18:53 GMT

Have you tried setting spi_cfg.cs_active_high = 0?

RE: Is there a problem with SPI communication of ncs1.9.0 SDK?

duxinglang — Fri, 26 Aug 2022 03:39:58 GMT

No matter I put gpio_dt_flags set to GPIO_ACTIVE_HIGH or GPIO_ACTIVE_LOW, the waveforms I see from the logic analyzer are all high-level, which is very strange. like this:

static void LCD_SPI_Init(void)
{
	spi_lcd = device_get_binding(LCD_DEV);
	if(!spi_lcd) 
	{
		return;
	}

	spi_cfg.operation = SPI_OP_MODE_MASTER | SPI_WORD_SET(8);
	spi_cfg.frequency = 8000000;
	spi_cfg.slave = 0;

	spi_cs_ctr.gpio_dev = device_get_binding(LCD_PORT);
	if(!spi_cs_ctr.gpio_dev)
	{
		return;
	}

	spi_cs_ctr.gpio_pin = CS;
	spi_cs_ctr.delay = 0U;
	spi_cs_ctr.gpio_dt_flags = GPIO_ACTIVE_LOW;//GPIO_ACTIVE_HIGH
	spi_cfg.cs = &spi_cs_ctr;	
}

RE: Is there a problem with SPI communication of ncs1.9.0 SDK?

Einarh — Mon, 15 Aug 2022 09:30:23 GMT

I believe you should get active low by setting cs_active_high to 0

RE: Is there a problem with SPI communication of ncs1.9.0 SDK?

duxinglang — Mon, 15 Aug 2022 09:26:56 GMT

Yes, I see SPI_ CS_ ACTIVE_ High is the setting item, but what I need is that the CS signal is effective at low level. I don't see SPI_ CS_ ACTIVE_ Low this option.

RE: Is there a problem with SPI communication of ncs1.9.0 SDK?

Einarh — Mon, 15 Aug 2022 08:00:48 GMT

I can't see that you've set the CS polarity, so you should try doing that.

How is your spi_cfg struct defined?

RE: Is there a problem with SPI communication of ncs1.9.0 SDK?

duxinglang — Mon, 15 Aug 2022 05:35:12 GMT

Hi, this is my spi cpnfiguration:

static void LCD_SPI_Init(void)
{
	spi_lcd = device_get_binding(LCD_DEV);
	if(!spi_lcd) 
	{
		printk("Could not get %s device\n", LCD_DEV);
		return;
	}

	spi_cfg.operation = SPI_OP_MODE_MASTER | SPI_WORD_SET(8);
	spi_cfg.frequency = 8000000;
	spi_cfg.slave = 0;

	spi_cs_ctr.gpio_dev = device_get_binding(LCD_PORT);
	if (!spi_cs_ctr.gpio_dev)
	{
		printk("Unable to get GPIO SPI CS device\n");
		return;
	}

	spi_cs_ctr.gpio_pin = CS;
	spi_cs_ctr.delay = 0U;
	spi_cfg.cs = &spi_cs_ctr;
}

RE: Is there a problem with SPI communication of ncs1.9.0 SDK?

Einarh — Fri, 12 Aug 2022 11:38:24 GMT

Hello!

You should be able to set the CS polarity in your SPI configuration:

http://developer.nordicsemi.com/nRF_Connect_SDK/doc/latest/zephyr/hardware/peripherals/spi.html#c.spi_config

What does your current SPI configuration look like?

Best regards,

Einar