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examples: disco: Using generic board configuration. #11983

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examples: disco: Using generic board configuration.
cybertale Dec 10, 2018
b887378
examples: disco: Apply changes to the corresponding doc.
cybertale Dec 10, 2018
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55 changes: 16 additions & 39 deletions samples/basic/disco/README.rst
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Expand Up @@ -9,51 +9,28 @@ Overview
A simple 'disco' demo. The demo assumes that 2 LEDs are connected to
GPIO outputs of the MCU/board.

Requirements
************

Wiring
******
This demo assumes there are two LEDs connected to two GPIO lines. These two
LEDs should be given aliases as 'led0' and 'led1' in the board dts file so the
configure process will automatically create these four define macros in generated
board head file
:file:`samples/basic/disco/build/zephyr/include/generated/generated_dts_board.h`.

The code may need some work before running on another board: set PORT,
LED1 and LED2 according to the board's GPIO configuration.

Nucleo-64 F103RB/F401RE boards
==============================

Connect two LEDs to PB5 and PB8 pins. PB5 is mapped to the
Arduino's D4 pin and PB8 to Arduino's D15. For more details about
these boards see:

- https://developer.mbed.org/platforms/ST-Nucleo-F103RB/
- https://developer.mbed.org/platforms/ST-Nucleo-F401RE/

Arduino 101 (x86)
=================

Connect two LEDs to D4 (IO4) and D7 (IO7) pins. The schematics for the Arduino
101 board is available at:

https://www.arduino.cc/en/uploads/Main/Arduino101-REV4Schematic.pdf

For Arduino 101's pinmux mapping in Zephyr, see: :file:`boards/x86/arduino_101/pinmux.c`

Modify the src/main.c file and set:

.. code-block:: c

#define PORT CONFIG_GPIO_QMSI_0_NAME
/* GPIO_19 is Arduino's D4 */
#define LED1 19
/* GPIO_20 is Arduino's D7 */
#define LED2 20
- LED0_GPIO_CONTROLLER
- LED0_GPIO_PIN
- LED1_GPIO_CONTROLLER
- LED1_GPIO_PIN

Building and Running
*********************

After startup, the program looks up a predefined GPIO device defined by 'PORT',
and configures pins 'LED1' and 'LED2' in output mode. During each iteration of
the main loop, the state of GPIO lines will be changed so that one of the lines
is in high state, while the other is in low, thus switching the LEDs on and off
in an alternating pattern.
After startup, the program looks up two predefined GPIO line defined in
devicetree, and configures them in output mode. During each iteration of the
main loop, the state of GPIO lines will be changed so that one of the lines is
in high state, while the other is in low, thus switching the LEDs on and off in
an alternating pattern.

This project does not output to the serial console, but instead causes two LEDs
connected to the GPIO device to blink in an alternating pattern.
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27 changes: 11 additions & 16 deletions samples/basic/disco/src/main.c
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Expand Up @@ -8,33 +8,28 @@
#include <device.h>
#include <gpio.h>

/**
* the demo assumes use of nucleo_f103rb board, adjust defines below
* to fit your board
*/
#define LED0_PORT LED0_GPIO_CONTROLLER
#define LED1_PORT LED1_GPIO_CONTROLLER

/* we're going to use PB8 and PB5 */
#define PORT "GPIOB"
/* PB5 */
#define LED1 5
/* PB8 */
#define LED2 8
#define LED0 LED0_GPIO_PIN
#define LED1 LED1_GPIO_PIN

#define SLEEP_TIME 500

void main(void)
{
int cnt = 0;
struct device *gpiob;
struct device *gpio0, *gpio1;

gpiob = device_get_binding(PORT);
gpio0 = device_get_binding(LED0_PORT);
gpio1 = device_get_binding(LED1_PORT);

gpio_pin_configure(gpiob, LED1, GPIO_DIR_OUT);
gpio_pin_configure(gpiob, LED2, GPIO_DIR_OUT);
gpio_pin_configure(gpio0, LED0, GPIO_DIR_OUT);
gpio_pin_configure(gpio1, LED1, GPIO_DIR_OUT);

while (1) {
gpio_pin_write(gpiob, LED1, cnt % 2);
gpio_pin_write(gpiob, LED2, (cnt + 1) % 2);
gpio_pin_write(gpio0, LED0, cnt % 2);
gpio_pin_write(gpio1, LED1, (cnt + 1) % 2);
k_sleep(SLEEP_TIME);
cnt++;
}
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