RE: Zephyr CustomBoard with NRF52840 and MCP23S17

trug — Tue, 06 Oct 2020 14:51:06 GMT

Ok I found my problems:

1. Custom board error

Between the Zephyr version 2.1.0 and version 2.4.0 are some differences.

1.1 In XXX_defconfig the following configs aren't supported anymore:

CONFIG_ARM=y
CONFIG_SOC_FAMILY_NRF=y

1.2 In XXX.dts

compatible = "nordic,nrf52840-qiaa"; is not working!

I use compatible = "nordic,nrf52840-dk-nrf52840"; instead.

2. MCP23S17 pins

The gpio expander mcp23s17 uses low active reset (nReset) and low active chip select (nCS).

In my XYZ.overlay file I have to set the CS Pin to 1

Wrong:

cs-gpios = <&gpio1 1 0>;

Correct:

cs-gpios = <&gpio1 1 1>;

3. My solution

3.1 Here my .overlay file

/* GPIO Expander */
&spi2 {
    label="SPI2";
    status = "okay";
    sck-pin = <36>;
    mosi-pin = <37>;
    miso-pin = <38>;
    cs-gpios = <&gpio1 1 1>;

    spi2gpio: gpio@0 {	
    	label="mcp23s17";
	compatible = "microchip,mcp23s17";
        gpio-controller;
        #gpio-cells = <2>;
        spi-max-frequency = <800000>;
        reg = <0>;
	ngpios = <16>;
    };
};

3.2 Here my main.c for testing

#include <zephyr.h>
#include <device.h>
#include <devicetree.h>
#include <drivers/gpio.h>


#include "CustomBoard.h"


#include <sys/printk.h>
#include <logging/log.h>
LOG_MODULE_REGISTER(blinky_logging, LOG_LEVEL_DBG);

/* 1000 msec = 1 sec */
#define SLEEP_TIME_MS   1000

/* The devicetree node identifier for the "led0" alias. */
#define LED0_NODE DT_ALIAS(led0)

#if DT_NODE_HAS_STATUS(LED0_NODE, okay)
#define LED0		DT_GPIO_LABEL(LED0_NODE, gpios)
#define PIN_LED0	DT_GPIO_PIN(LED0_NODE, gpios)
#define FLAGS_LED0	DT_GPIO_FLAGS(LED0_NODE, gpios)
#else
/* A build error here means your board isn't set up to blink an LED. */
#error "Unsupported board: led0 devicetree alias is not defined"
#define LED0		""
#define PIN_LED0	0
#define FLAGS_LED0	0
#endif



/* The devicetree node identifier for the "led1" alias. */
#define LED1_NODE DT_ALIAS(led1)

#if DT_NODE_HAS_STATUS(LED1_NODE, okay)
#define LED1		DT_GPIO_LABEL(LED1_NODE, gpios)
#define PIN_LED1	DT_GPIO_PIN(LED1_NODE, gpios)
#define FLAGS_LED1	DT_GPIO_FLAGS(LED1_NODE, gpios)
#else
/* A build error here means your board isn't set up to blink an LED. */
#error "Unsupported board: led0 devicetree alias is not defined"
#define LED0		""
#define PIN_LED1	1
#define FLAGS_LED1	1
#endif



#define	MCP23S17_DEV_NAME	DT_LABEL(DT_NODELABEL(spi2gpio))


void main(void)
{

	k_msleep(1000);
	LOG_INF(">>> [main]: Test Application <<<");
	
	const struct device *dev_led_0,*dev_led_1;
	const struct device *mcp23s17_dev,*gpio_port0_dev;
	bool led_is_on = true;
	int ret,i;
	
	//-------------------------------------------------------------------------------
	// MCP23S17
	//-------------------------------------------------------------------------------
	LOG_INF("[main]: MCP23S17_Init");
	mcp23s17_dev = device_get_binding(MCP23S17_DEV_NAME);
	
	if (!mcp23s17_dev) {
		LOG_INF("Cannot find mcp23s17!\n");
		return;
	}

	for(i=0; i<16; i++){
		ret = gpio_pin_configure(mcp23s17_dev, i, GPIO_OUTPUT_ACTIVE);
		if (ret < 0) {
			return;
		}
	}


	//-------------------------------------------------------------------------------
	// GPIO Port_0
	//-------------------------------------------------------------------------------
	LOG_INF("[main]: GPIO_Port0_Init");
	gpio_port0_dev = device_get_binding(CONFIG_GPIO_PORT_0);
	if (gpio_port0_dev == NULL) {
		return;
	}
	ret = gpio_pin_configure(gpio_port0_dev, GPIO_EXP_RST, GPIO_OUTPUT_ACTIVE);
	if (ret < 0) {
		return;
	}
	gpio_pin_set(gpio_port0_dev, GPIO_EXP_RST, (int)true);
	
		
	//-------------------------------------------------------------------------------
	// LED
	//-------------------------------------------------------------------------------
	LOG_INF("[main]: LED_Init");
	dev_led_0 = device_get_binding(LED0);
	dev_led_1 = device_get_binding(LED1);
	if (dev_led_0 == NULL && dev_led_1 == NULL) {
		LOG_INF("LEDs not found!\n");
		return;
	}

	ret = gpio_pin_configure(dev_led_0, PIN_LED0, GPIO_OUTPUT_ACTIVE | FLAGS_LED0);
	if (ret < 0) {
		return;
	}

	ret = gpio_pin_configure(dev_led_1, PIN_LED1, GPIO_OUTPUT_ACTIVE | FLAGS_LED1);
	if (ret < 0) {
		return;
	}

	//-------------------------------------------------------------------------------
	// While
	//-------------------------------------------------------------------------------
	LOG_INF("[main]: while");
	while (1) {
		gpio_pin_set(dev_led_0, PIN_LED0, (int)led_is_on);
		
		for(i=0; i<16; i++){
			//LOG_INF(">>> [main:while]: gpio[%i]=[%i]  <<<",i,(int)led_is_on);
			gpio_pin_set(mcp23s17_dev, i, (int)led_is_on);
		}
		LOG_INF("[main:while]: gpio[XYZ]=[%i]",i,(int)led_is_on);
		
		led_is_on = !led_is_on;
		k_msleep(SLEEP_TIME_MS);
		
		gpio_pin_set(dev_led_1, PIN_LED1, (int)led_is_on);
		k_msleep(SLEEP_TIME_MS);

	}
}

RE: Zephyr CustomBoard with NRF52840 and MCP23S17

Simon — Wed, 30 Sep 2020 13:51:55 GMT

Could you upload your board folder in zipped format, then I can test it myself? Have you seen this guide? Try following that when creating your board folder.

Best regards,

Simon

RE: Zephyr CustomBoard with NRF52840 and MCP23S17

trug — Wed, 30 Sep 2020 09:18:07 GMT

Since the Zephyr version of Nordic is lagging behind, I use the latest version of Zephyr (2.4). I use some drivers on my customboard that are not yet included in the NCS.

Do you think this could also lead to further problems?

RE: Zephyr CustomBoard with NRF52840 and MCP23S17

trug — Wed, 30 Sep 2020 09:14:37 GMT

Thanks Simon

I tried to build the firmware as nrf52840dk_nrf52840 and it worked fine.
But it does not work with my customboard.

Since my customboard is not in the Zephyr directory, it could be a CMake problem?!

I will check it and as soon as I find a solution, I will post it here.

RE: Zephyr CustomBoard with NRF52840 and MCP23S17

Simon — Tue, 29 Sep 2020 14:25:10 GMT

What tag are you using? I tested your sample with NCS v1.3.0 and it built without any errors. The only change I made was to swap #ngpios with ngpios in the overlay file.

Best regards,

Simon