LEDs (HMM)
Overview⚓︎
This platform has four red, green and yellow light-emitting diodes (LEDs).
LEDs are used to indicate system flashing.
LED 1 will be yellow when entering u-boot and green when leaving. The same LED is then set up with a heartbeat trigger from device tree and blink in green light to indicate that the system is running. After that point, any application running on the device may take over and change the behavior of the LEDs. If your product comes with customer specific software, see the dedicated software manual companion for the specific LED matrix.
The following LEDs are available⚓︎
| Name | Overlay Typical Name | Default mode |
|---|---|---|
| green:LED_1 | A | Heartbeat |
| red:LED_1 | A | Off |
| green:LED_2 | B | Off |
| red:LED_2 | B | Off |
| green:LED_3 | C | Off |
| red:LED_3 | C | Off |
| green:LED_4 | D | Off |
| red:LED_4 | D | Off |
Default front⚓︎
Overlay illustration (HM020-***W11, HM020-***W21)
- 🟢 D
- 🟢 C
- 🟢 B
- 🟢 A
System built in modes⚓︎
| Stage | LED D (Top) | LED C | LED B | LED A (Bottom) |
|---|---|---|---|---|
| Power On | 🟡 | 🟡 | 🟡 | 🟡 |
| Booting U-Boot | ⚫ | ⚫ | ⚫ | 🟡 |
| Bootscript(load bootfs) | ⚫ | ⚫ | ⚫ | ⚫ |
| Flashing Mode(initial USB*) | ⚫ | ⚫ | ⚫ | ⚫ |
| File Load OK | ⚫ | 🟢 | ⚫ | ⚫ |
| File Load Fail(USB*) | ⚫ | 🔴 | ⚫ | ⚫ |
| Flash Success | 🟢 | 🟢 | ⚫ | ⚫ |
| Booting Linux | ⚫ | 🟢 | ||
| Linux Running | ⚫ | ⚫ | ⚫ | 🟢/⚫(blinking) |
| - *USB= Flashing with USB flash drive |