128 lines
3.5 KiB
C
128 lines
3.5 KiB
C
/*
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* The MIT License (MIT)
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*
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* Copyright (c) 2019 Ha Thach (tinyusb.org)
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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* THE SOFTWARE.
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*
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* This file is part of the TinyUSB stack.
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*/
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#include "../board.h"
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#include "stm32f4xx.h"
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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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#if CFG_TUSB_OS == OPT_OS_NONE
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// 1ms tick timer
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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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//--------------------------------------------------------------------+
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// Board porting API
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//--------------------------------------------------------------------+
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void board_led_write(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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uint32_t board_button_read(void)
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{
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// TODO implement
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return 0;
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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 board_millis(void)
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{
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return 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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