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stm32/boards/OPENMVPT: Fix white illuminator default state and Lepton reset #149

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stm32/boards/OPENMVPT: Fix white illuminator default state and Lepton reset #149

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f792dca
stm32/boards/OPENMVPT: Stop turning the white illuminator on at boot.
kwagyeman Sep 19, 2026
631ffab
stm32/boards/OPENMVPT: Actually reset the Lepton at boot.
kwagyeman Sep 19, 2026
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18 changes: 16 additions & 2 deletions ports/stm32/boards/OPENMVPT/board_init.c
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Original file line number Diff line number Diff line change
Expand Up @@ -6,10 +6,16 @@
#define OMV_BOOTLOADER_MAGIC_VALUE (0xB00710ADU)

void board_early_init(void) {
// Bring FLIR Lepton out of reset.
// Hold the FLIR Lepton in reset until its master clock is running. The part
// wants MCLK present when RESET_L is released, and driving RSTN straight
// high (as this used to) means a Lepton that is already confused never sees
// a reset at all: it answers on I2C but never reports booted, omv_csi_init()
// fails, and main() takes that as fatal before USB is up. The board then
// looks bricked - no enumeration, no REPL - and no amount of resetting the
// MCU recovers it, because only removing the Lepton's power does.
mp_hal_pin_config(pyb_pin_LEPTON_RSTN, MP_HAL_PIN_MODE_OUTPUT, MP_HAL_PIN_PULL_NONE, 0);
mp_hal_pin_config_speed(pyb_pin_LEPTON_RSTN, MP_HAL_PIN_SPEED_LOW);
mp_hal_pin_write(pyb_pin_LEPTON_RSTN, 1);
mp_hal_pin_write(pyb_pin_LEPTON_RSTN, 0);

// Release powerdown.
mp_hal_pin_config(pyb_pin_LEPTON_PWDN, MP_HAL_PIN_MODE_OUTPUT, MP_HAL_PIN_PULL_NONE, 0);
Expand Down Expand Up @@ -50,6 +56,14 @@ void board_early_init(void) {
HAL_TIM_PWM_Init(&mclk_tim_handle);
HAL_TIM_PWM_ConfigChannel(&mclk_tim_handle, &mclk_tim_oc_handle, TIM_CHANNEL_2);
HAL_TIM_PWM_Start(&mclk_tim_handle, TIM_CHANNEL_2);

// Release the Lepton now that MCLK is running, after holding reset for well
// over the 5000 clock periods the part requires. SystemClock_Config() has
// not run yet, so this is a spin rather than mp_hal_delay_ms(): at the 64MHz
// HSI boot clock this is comfortably past 210us even if it compiles tight.
for (volatile uint32_t i = 0; i < 50000; i++) {
}
mp_hal_pin_write(pyb_pin_LEPTON_RSTN, 1);
}

void board_low_power(int mode) {
Expand Down
5 changes: 3 additions & 2 deletions ports/stm32/boards/OPENMVPT/mpconfigboard.h
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Original file line number Diff line number Diff line change
Expand Up @@ -116,9 +116,10 @@ void board_low_power(int mode);
#define MICROPY_HW_LED1 (pin_C0) // red
#define MICROPY_HW_LED2 (pin_C1) // green
#define MICROPY_HW_LED3 (pin_C2) // blue
#define MICROPY_HW_LED4 (pin_G3) // white
#define MICROPY_HW_LED_OTYPE (GPIO_MODE_OUTPUT_PP)
// NOTE: LEDs are active low.
// NOTE: LEDs are active low. The white illuminator on PG3 is NOT: it gates a
// PMZ390UN N-MOSFET (100K pulldown on the gate), so it is active high and is
// deliberately left out of the LED table - see the commit message.
#define MICROPY_HW_LED_ON(pin) (pin->gpio->BSRR = (pin->pin_mask << 16))
#define MICROPY_HW_LED_OFF(pin) (pin->gpio->BSRR = pin->pin_mask)

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