139 lines
4.3 KiB
C
139 lines
4.3 KiB
C
/**************************************************************************/
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/*!
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@file board_metro_m4_express.c
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@author hathach (tinyusb.org)
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@section LICENSE
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Software License Agreement (BSD License)
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Copyright (c) 2018, hathach (tinyusb.org)
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All rights reserved.
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Redistribution and use in source and binary forms, with or without
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modification, are permitted provided that the following conditions are met:
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1. Redistributions of source code must retain the above copyright
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notice, this list of conditions and the following disclaimer.
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2. Redistributions in binary form must reproduce the above copyright
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notice, this list of conditions and the following disclaimer in the
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documentation and/or other materials provided with the distribution.
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3. Neither the name of the copyright holders nor the
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names of its contributors may be used to endorse or promote products
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derived from this software without specific prior written permission.
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THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS ''AS IS'' AND ANY
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EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER BE LIABLE FOR ANY
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DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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(INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
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ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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This file is part of the tinyusb stack.
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*/
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/**************************************************************************/
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#include "bsp/board.h"
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#include "stm32f4xx.h"
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#include "tusb_option.h"
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//--------------------------------------------------------------------+
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// MACRO TYPEDEF CONSTANT ENUM DECLARATION
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//--------------------------------------------------------------------+
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void board_init(void)
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{
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// Init the LED on PD14
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RCC->AHB1ENR |= RCC_AHB1ENR_GPIODEN;
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GPIOD->MODER |= GPIO_MODER_MODE14_0;
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// USB Clock init
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// PLL input- 8 MHz (External oscillator clock; HSI clock tolerance isn't
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// tight enough- 1%, need 0.25%)
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// VCO input- 1 to 2 MHz (2 MHz, M = 4)
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// VCO output- 100 to 432 MHz (144 MHz, N = 72)
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// Main PLL out- <= 180 MHz (18 MHz, P = 3- divides by 8)
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// USB PLL out- 48 MHz (Q = 3)
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RCC->PLLCFGR = RCC_PLLCFGR_PLLSRC_HSE | (3 << RCC_PLLCFGR_PLLQ_Pos) | \
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(3 << RCC_PLLCFGR_PLLP_Pos) | (72 << RCC_PLLCFGR_PLLN_Pos) | \
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(4 << RCC_PLLCFGR_PLLM_Pos);
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// Wait for external clock to become ready
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RCC->CR |= RCC_CR_HSEON;
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while(!(RCC->CR & RCC_CR_HSERDY_Msk));
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// Wait for PLL to become ready
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RCC->CR |= RCC_CR_PLLON;
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while(!(RCC->CR & RCC_CR_PLLRDY_Msk));
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// Switch clocks!
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RCC->CFGR |= RCC_CFGR_SW_1;
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// Notify runtime of frequency change.
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SystemCoreClockUpdate();
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// Systick init
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#if CFG_TUSB_OS == OPT_OS_NONE
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SysTick_Config(SystemCoreClock / 1000);
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#endif
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RCC->AHB2ENR |= RCC_AHB2ENR_OTGFSEN;
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// USB Pin Init
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// PA9- VUSB, PA10- ID, PA11- DM, PA12- DP
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// PC0- Power on
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RCC->AHB1ENR |= RCC_AHB1ENR_GPIOAEN;
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GPIOA->MODER |= GPIO_MODER_MODE9_1 | GPIO_MODER_MODE10_1 | \
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GPIO_MODER_MODE11_1 | GPIO_MODER_MODE12_1;
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GPIOA->AFR[1] |= (10 << GPIO_AFRH_AFSEL9_Pos) | \
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(10 << GPIO_AFRH_AFSEL10_Pos) | (10 << GPIO_AFRH_AFSEL11_Pos) | \
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(10 << GPIO_AFRH_AFSEL12_Pos);
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// Pullup required on ID, despite the manual claiming there's an
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// internal pullup already (page 1245, Rev 17)
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GPIOA->PUPDR |= GPIO_PUPDR_PUPD10_0;
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}
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void board_led_control(bool state)
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{
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if (!state) {
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GPIOD->BSRR = GPIO_BSRR_BR14;
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} else {
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GPIOD->BSRR = GPIO_BSRR_BS14;
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}
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}
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/*------------------------------------------------------------------*/
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/* TUSB HAL MILLISECOND
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*------------------------------------------------------------------*/
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#if CFG_TUSB_OS == OPT_OS_NONE
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volatile uint32_t system_ticks = 0;
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void SysTick_Handler (void)
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{
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system_ticks++;
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}
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uint32_t tusb_hal_millis(void)
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{
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return board_tick2ms(system_ticks);
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}
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#endif
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void HardFault_Handler (void)
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{
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asm("bkpt");
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}
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// Required by __libc_init_array in startup code if we are compiling using
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// -nostdlib/-nostartfiles.
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void _init(void)
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{
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}
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