marlin/buildroot/share/PlatformIO/variants/marlin_maple_CHITU_F103/wirish/boards_setup.cpp

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/**
 * @file wirish/stm32f1/boards_setup.cpp
 * @author Marti Bolivar <mbolivar@leaflabs.com>
 * @brief STM32F1 chip setup.
 *
 * This file controls how init() behaves on the STM32F1. Be very
 * careful when changing anything here. Many of these values depend
 * upon each other.
 */

#include "boards_private.h"

#include <libmaple/gpio.h>
#include <libmaple/timer.h>

#include <boards.h>
#include <usb_serial.h>

// Allow boards to provide a PLL multiplier. This is useful for
// e.g. STM32F100 value line MCUs, which use slower multipliers.
// (We're leaving the default to RCC_PLLMUL_9 for now, since that
// works for F103 performance line MCUs, which is all that LeafLabs
// currently officially supports).
#ifndef BOARD_RCC_PLLMUL
  #if !USE_HSI_CLOCK
    #if F_CPU==128000000
      #define BOARD_RCC_PLLMUL RCC_PLLMUL_16
    #elif F_CPU==72000000
      #define BOARD_RCC_PLLMUL RCC_PLLMUL_9
    #elif F_CPU==48000000
      #define BOARD_RCC_PLLMUL RCC_PLLMUL_6
    #elif F_CPU==16000000
      #define BOARD_RCC_PLLMUL RCC_PLLMUL_2
    #endif
  #else
    #define BOARD_RCC_PLLMUL RCC_PLLMUL_16
  #endif
#endif

namespace wirish {
    namespace priv {

        static stm32f1_rcc_pll_data pll_data = {BOARD_RCC_PLLMUL};
#if !USE_HSI_CLOCK
        __weak rcc_pll_cfg w_board_pll_cfg = {RCC_PLLSRC_HSE, &pll_data};
#else
        __weak rcc_pll_cfg w_board_pll_cfg = {RCC_PLLSRC_HSI_DIV_2, &pll_data};
#endif
        __weak adc_prescaler w_adc_pre = ADC_PRE_PCLK2_DIV_6;
        __weak adc_smp_rate w_adc_smp = ADC_SMPR_55_5;

        __weak void board_reset_pll(void) {
            // TODO
        }

        __weak void board_setup_clock_prescalers(void) {
            rcc_set_prescaler(RCC_PRESCALER_AHB, RCC_AHB_SYSCLK_DIV_1);
            rcc_set_prescaler(RCC_PRESCALER_APB1, RCC_APB1_HCLK_DIV_2);
            rcc_set_prescaler(RCC_PRESCALER_APB2, RCC_APB2_HCLK_DIV_1);
            rcc_clk_disable(RCC_USB);
#if F_CPU == 72000000
            rcc_set_prescaler(RCC_PRESCALER_USB, RCC_USB_SYSCLK_DIV_1_5);
#elif F_CPU == 48000000
            rcc_set_prescaler(RCC_PRESCALER_USB, RCC_USB_SYSCLK_DIV_1);
#endif
        }

        __weak void board_setup_gpio(void) {
            /**
             * PA14 is a pull up pin. But, some V5 boards it start with LOW state! And just behave properly when the Z- PROBE is actived at least once.
             * So, if the sensor isnt actived, the PA14 pin will be forever in LOW state, telling Marlin the probe IS ALWAYS ACTIVE, that isnt the case!
             * Chitu original firmware seems to start with every pullup PIN with HIGH to workaround this.
             * So we are doing the same here.
             * This hack only works if applied *before* the GPIO Init, it's the reason I did it here.
             */
            #ifdef CHITU_V5_Z_MIN_BUGFIX
              GPIOA->regs->BSRR = (1U << PA14);
            #endif
            gpio_init_all();
        }

        __weak void board_setup_usb(void) {
#ifdef SERIAL_USB
#ifdef GENERIC_BOOTLOADER
          // Reset the USB interface on generic boards - developed by Victor PV
          gpio_set_mode(PIN_MAP[PA12].gpio_device, PIN_MAP[PA12].gpio_bit, GPIO_OUTPUT_PP);
          gpio_write_bit(PIN_MAP[PA12].gpio_device, PIN_MAP[PA12].gpio_bit,0);

          for (volatile unsigned int i = 0; i < 512; i++); // Only small delay seems to be needed, and USB pins will get configured in Serial.begin
          gpio_set_mode(PIN_MAP[PA12].gpio_device, PIN_MAP[PA12].gpio_bit, GPIO_INPUT_FLOATING);
#endif
          Serial.begin(); // Roger Clark. Changed SerialUSB to Serial for Arduino sketch compatibility
#endif
        }

        __weak void series_init(void) {
            // Initialize AFIO here, too, so peripheral remaps and external
            // interrupts work out of the box.
            afio_init();
        }
    }
}