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LED sample application

Overview

This sample allows to test the Microchip led-xec driver which uses the breathing-blinking LED (BBLED) controllers. The SoC design is fixed allowing each BBLED control over one specific GPIO. MEC15xx and MEC172x: BBLED controller 0 uses GPIO 0156. BBLED controller 1 uses GPIO 0157. BBLED controller 2 uses GPIO 0153. MEC172x has a fourth instance of BBLED. BBLED controller 3 uses GPIO 0035

Test pattern

For each LEDs (one after the other):

  • Turning on

  • Turning off

  • Blinking on: 0.1 sec, off: 0.1 sec

  • Blinking on: 1 sec, off: 1 sec

Board Jumpers

EVB: mec172xevb_assy6906 BBLED0 GPIO 0156. Connect GPIO 0156 to board LED4 by placing a wire from JP71-11 to J47-3. Make sure there are no jumpers on JP54 1-2 and JP21 4-5

BBLED1 GPIO 0157. Connect GPIO 0156 to board LED5 by placing a wire from JP71-12 to J48-3. Make sure there are no jumpers on JP54 3-4 and JP21 16-17

BBLED2 GPIO 0153. Connect GPIO 0153 to board LED7 by placing a wire from JP71-5 to JP146-5. JP146-5 is connected to MEC172x VCI_OUT1 without a jumper. Force VCI_OUT1 high by forcing VCI_IN1 high: install jumper on J55 3-4 which pulls VCI_IN1 to the VBAT rail via a 100K pull-up. Requires VBAT power rail is connected to VTR or some other power source.

BBLED3 GPIO 0035. Connect GPIO 0035 to board LED7 by placing a wire from JP67-19 to JP146-1. Make sure there is no jumper on JP79 17-18. JP146-1 is connected to MEC172x VCI_OUT2 without a jumper. Force VCI_OUT2 high by forcing VCI_IN2 high: install a jumper on J55 5-6 which pulls VCI_IN2 to the VBAT rail via a 100K pull-up. Requires VBAT power rail is connected to VTR or some other power source.

EVB: mec15xxevb_assy6853 BBLED0 GPIO 0156. Add jumper on JP41 1-2 to connect GPIO 0156 to board LED2 Remove jumper on JP31 13-14

BBLED1 GPIO 0157. Add jumper on JP41 3-4 to connect GPIO 0157 to board LED3 Remove jumper on JP31 15-16

BBLED2 GPIO 0153. Add jumper on JP41 3-4 to connect GPIO 0153 to board LED4 Remove jumper on JP31 17-18

Building and Running

This sample can be built and executed on all the boards with the LEDs connected. The LEDs must be correctly described in the DTS. Each breathing-blinking LED controller is fixed by chip design to connect to one GPIO. The bbled node must have its PINCTRL properties set to the correct GPIO.