Merge pull request #135 from kwagyeman/kwabena/add_pt_buzzer_pin

ports/stm32: Add OpenMV PureThermal buzzer pin.

Author: iabdalkader

ports/stm32/boards/OPENMVPT/board_init.c

@@ -5,6 +5,53 @@
 #define OMV_BOOTLOADER_MAGIC_ADDR   (0x2001FFFCU)
 #define OMV_BOOTLOADER_MAGIC_VALUE  (0xB00710ADU)
 
+void board_early_init(void) {
+    // Bring FLIR Lepton out of reset.
+    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);
+
+    // Release powerdown.
+    mp_hal_pin_config(pyb_pin_LEPTON_PWDN, MP_HAL_PIN_MODE_OUTPUT, MP_HAL_PIN_PULL_NONE, 0);
+    mp_hal_pin_config_speed(pyb_pin_LEPTON_PWDN, MP_HAL_PIN_SPEED_LOW);
+    mp_hal_pin_write(pyb_pin_LEPTON_PWDN, 1);
+
+    // Enable FLIR Lepton MCLK.
+    mp_hal_pin_config(pyb_pin_LEPTON_MCLK, MP_HAL_PIN_MODE_ALT, MP_HAL_PIN_PULL_NONE, 4);
+    mp_hal_pin_config_speed(pyb_pin_LEPTON_MCLK, MP_HAL_PIN_SPEED_HIGH);
+
+    // Hardcode the clock frequency as SystemClock_Config() hasn't been called yet.
+    int tclk = 120000000 * 2; // HAL_RCC_GetPCLK2Freq() * 2
+    int period = (tclk / 24000000) - 1;
+
+    TIM_HandleTypeDef mclk_tim_handle;
+    mclk_tim_handle.Instance = TIM15;
+    mclk_tim_handle.Init.Prescaler = 0;
+    mclk_tim_handle.Init.CounterMode = TIM_COUNTERMODE_UP;
+    mclk_tim_handle.Init.Period = period;
+    mclk_tim_handle.Init.ClockDivision = TIM_CLOCKDIVISION_DIV1;
+    mclk_tim_handle.Init.RepetitionCounter = 0;
+    mclk_tim_handle.Init.AutoReloadPreload = TIM_AUTORELOAD_PRELOAD_DISABLE;
+
+    TIM_OC_InitTypeDef mclk_tim_oc_handle;
+    mclk_tim_oc_handle.Pulse = (period + 1) / 2;
+    mclk_tim_oc_handle.OCMode = TIM_OCMODE_PWM1;
+    mclk_tim_oc_handle.OCPolarity = TIM_OCPOLARITY_HIGH;
+    mclk_tim_oc_handle.OCNPolarity = TIM_OCNPOLARITY_HIGH;
+    mclk_tim_oc_handle.OCFastMode = TIM_OCFAST_DISABLE;
+    mclk_tim_oc_handle.OCIdleState = TIM_OCIDLESTATE_RESET;
+    mclk_tim_oc_handle.OCNIdleState = TIM_OCNIDLESTATE_RESET;
+
+    __HAL_RCC_TIM15_CLK_ENABLE();
+    __HAL_RCC_TIM15_CLK_SLEEP_ENABLE();
+    __HAL_RCC_TIM15_FORCE_RESET();
+    __HAL_RCC_TIM15_RELEASE_RESET();
+
+    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);
+}
+
 void board_low_power(int mode) {
     switch (mode) {
         case 0:     // Leave stop mode.

ports/stm32/boards/OPENMVPT/mpconfigboard.h

@@ -42,6 +42,9 @@ typedef unsigned int mp_uint_t;     // must be pointer size
 #define MICROPY_HW_SPIFLASH_SOFT_RESET      (1)
 #define MICROPY_HW_ENABLE_INTERNAL_FLASH_STORAGE (0)
 
+#define MICROPY_BOARD_EARLY_INIT board_early_init
+void board_early_init(void);
+
 extern void board_enter_bootloader(void);
 #define MICROPY_BOARD_ENTER_BOOTLOADER(nargs, args) board_enter_bootloader()
 

ports/stm32/boards/OPENMVPT/pins.csv

@@ -19,6 +19,7 @@ LED_WHITE,PG3
 LED_RED,-PC0
 LED_GREEN,-PC2
 LED_BLUE,-PC1
+BUZZER,PA1
 PA4,PA4
 PA15,PA15
 PB3,PB3
@@ -105,3 +106,6 @@ TOUCH_SCL,PJ13
 TOUCH_SDA,PJ14
 TOUCH_INT,PJ6
 WINC_INT,-PH5
+LEPTON_RSTN,PD5
+LEPTON_PWDN,PD4
+LEPTON_MCLK,PA3