NRF52840 learning journey (1) light up

Time in 2021 Nian 1 Yue 25 Ri , winter vacation home, a good school to learn

Development Board : snow's 100 head piece NRF52840 EVAL KIT

Download tool: JINLK V11 (preferably JLINK V9 or higher, some people use JLINK OB, other downloaders STLINK, DAP are not recommended)

Version number: KEIL5 programming environment, CMSIS is 5.3.0, CMSIS of NRF52840 is 8.35.0

Reference material: NRF52840-Eval-Kit-Schematic.pdf (Schematic)

nRF5_SDK_17.0.2_d674dde (official routine)

nRF5_SDK_17.0.0_offline_doc (official document)

Realization function: lighting, running water, flashing, etc.

Schematic diagram

LED light position is 13,14,9+32=41,16

When 13,14,41,16 is given low level, the LED is on

Use nrf_gpio_cfg_output to configure the IO port to output mode

code show as below

    nrf_gpio_cfg_output(13);
	nrf_gpio_cfg_output(14);
	nrf_gpio_cfg_output(41);
	nrf_gpio_cfg_output(16);

When the IO port output is 1, the LED is off, when the output is 0, the LED is on

Note: set is to set IO to 1, clear is to clear (IO is set to 0), toggle is to flip the IO state

code show as below

    nrf_gpio_cfg_output(13);
	nrf_gpio_cfg_output(14);
	nrf_gpio_cfg_output(41);
	nrf_gpio_cfg_output(16);

	nrf_gpio_pin_set(13);
	nrf_gpio_pin_set(14);
	nrf_gpio_pin_set(41);
	nrf_gpio_pin_set(16);
	nrf_gpio_pin_clear(13);

Download and burn, you can find that there is indeed an LED on (IO13 is on)

We will also use a delay function

nrf_delay_ms(300);

Note, include the header file

#include "nrf_delay.h"

The flashing light program is as follows

while(1)
	{
		nrf_gpio_pin_toggle(13);
		nrf_gpio_pin_toggle(14);
		nrf_gpio_pin_toggle(41);
		nrf_gpio_pin_toggle(16);
		nrf_delay_ms(300);
}

The flow lamp program is as follows

while(1)
	{
		nrf_gpio_pin_clear(13);
		nrf_delay_ms(300);
		nrf_gpio_pin_set(13);

		nrf_gpio_pin_clear(14);
		nrf_delay_ms(300);
		nrf_gpio_pin_set(14);
		
		nrf_gpio_pin_clear(41);
		nrf_delay_ms(300);
		nrf_gpio_pin_set(41);
		
		nrf_gpio_pin_clear(16);
		nrf_delay_ms(300);
		nrf_gpio_pin_set(16);
		
	}

In addition, you can also use macro definitions to define the name of the lamp, such as LED0, LED1,...

Use NRF_GPIO_PIN_MAP to define

Then you can use LED0 instead of 13, such as

I'll learn here when you light the lamp, see you later

NRF52840 learning journey (1) light up

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