STM32 MCU - WILK - REVB1
- Lukas Rosky
Customers may request access to the source-code of the firmware to modify it for their needs.
Commands & Registers (I2C)
I2C-Address: 0x40 (7-bit) | ||||
Register | Name | Access | Description | Default Value |
0x01 | REG_ID | read | ID-Register | 0x96 |
0x02 | REG_CONTROL | write | Restart and boot with BOOT_MODE= 0x04 - Shutdown (Hard) | - |
0x03 | REG_CONFIG | - | - | - |
0x04 | REG_PIN_CONFIG | write | <Pin> <Parameter> 0x01: Input, NoPull 0x20: Output PushPull, init low level 0x80: IRQ Rising Edge | - |
0x05 | REG_PIN_SET | write | <Pin> <Level> | - |
0x06 | REG_PIN_GET | write | <Pin> | - |
0x07 | REG_PWM_CONFIG | write | <Pin> <Duty Cycle [%]> | - |
0x08 | REG_ALTERNATE_ | write | Set Pin to specific alternate function. <Pin> <Alternate Function> Alternate Functions: |
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0x09 | REG_ADC_READ | read | Read ADC value: 0x00 - ADC_VOLT_MON (=5V_SLEEP/2) | - |
0x0A | REG_INT_STATUS0 | read | Read INT_STATUS register, clear it and reset EC_IRQ#_OD to “1” 0x01: GPIO4 | 0x00 |
0x0B | REG_INT_ENABLE0 | r/w | Read or update IRQ Enable Register. Same signals as in REG_INT_STATUS0. | 0x00 |
0x0C | REG_INT_STATUS1 | read | Read INT_STATUS2 register, clear it and reset EC_IRQ#_OD to “1” if all interrupts are read. 0x01: USB1_EN_OC# | 0x00 |
0x0D | REG_INT_ENABLE1 | r/w | Read or update IRQ Enable Register. Same signals as in REG_INT_STATUS1. | 0x00 |
0x0E | REG_INT_STATUS2 | - | - |
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0x0F | REG_INT_ENABLE2 | - | - |
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0x10 | REG_SHUTDOWN_DELAY | r/w | Read/write delay in 10ms steps before powering off during soft shutdown/restart. (0x01 = 10ms, 0xFF = 2550 ms) |
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0x80 | REG_SECO_CODE0 | read | Read bits [7:0] of SECO_CODE. | - |
0x81 | REG_SECO_CODE1 | read | Read bits [11:8] of SECO_CODE. |
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0x90 | REG_RAM_CODE | read | Read RAM_CODE [3:0]. 0x4 - 4GB RAM | - |
0xF0 | REG_VERSION | read | Read firmware version | 0x01 |
Configurable GPIO Pins (I2C)
The following Pins are configurable via I2C:
Pin# | Name | Default Configuration | IRQ | Alternate Function |
|---|---|---|---|---|
0 | GPIO4 | Input, NoPull |
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1 | GPIO5 | Input, NoPull | PWM | |
2 | GPIO11 | Input, NoPull |
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3 | GPIO12 | Input, NoPull |
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4 | GPIO13 | Input, NoPull |
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5 | RTC_INT# | (IRQ only) |
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6 | SMB_ALERT# | (IRQ only) |
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7 | USB0_EN_OC# | Output, OpenDrain, init low level |
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8 | USB1_EN_OC# | Output, OpenDrain, init low level |
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9 | USB2_EN_OC# | Output, OpenDrain, init low level |
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10 | CPU_IRQ# | (IRQ only) | * |
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11 | USB_HUB_RST# | Output, PushPull, init low level |
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12 | WIFI_PWRDWN# | Output, PushPull, init low level |
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13 | BATLOW# | Input, NoPull |
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14 | CHARGING# | Input, NoPull |
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15 | CHARGER_PRSNT# | Input, NoPull |
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16 | RESET_OUT# | Output, PushPull, init low level, set high ~100ms after startup (-> SMARC Spec.) |
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*: Polled IRQ
Carrier board BOOT_SEL configuration
The BOOT_SEL[2:0] Configuration on the carrier board is used to determine whether the system will boot into serial download mode or attempt to boot from eMMC:
BOOT_SEL[2:0]# | KPCOL0 | Boot Device |
|---|---|---|
1 0 1 | 0 | Serial Download Mode |
1 1 0 | 1 | Module eMMC (default) |
Any other BOOT_SEL configuration will be treated like the default option.
Connecting FORCE_RECOV# to GND will cause the STM32 to always set the BOOT_MODE to Serial Dwonload Mode.
Other Functions
Pressing the POWER button for <10 seconds while the system is running (if 1V8_RUN is enabled and Linux is running) triggers a soft shutdown.
Holding the POWER button for >= 10 seconds will cause the system to shut down hard.
Holding the RESET button for >= 10 seconds will cause the system to reboot into serial download mode rather than rebooting into the mode selected by the BOOT_SEL configuration of the carrier board.
The “RESET” button is automatically enabled when booting into Linux.