226 lines
7.0 KiB
C++
226 lines
7.0 KiB
C++
/******************************************************************************
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* The MIT License
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*
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* Copyright (c) 2010 Perry Hung.
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* Copyright (c) 2011, 2012 LeafLabs, LLC.
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*
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* Permission is hereby granted, free of charge, to any person
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* obtaining a copy of this software and associated documentation
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* files (the "Software"), to deal in the Software without
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* restriction, including without limitation the rights to use, copy,
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* modify, merge, publish, distribute, sublicense, and/or sell copies
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* 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
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* included in 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,
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* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
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* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
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* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
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* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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* SOFTWARE.
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*****************************************************************************/
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/**
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* @file wirish/boards.cpp
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* @brief init() and board routines.
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*
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* This file is mostly interesting for the init() function, which
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* configures Flash, the core clocks, and a variety of other available
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* peripherals on the board so the rest of Wirish doesn't have to turn
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* things on before using them.
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*
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* Prior to returning, init() calls boardInit(), which allows boards
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* to perform any initialization they need to. This file includes a
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* weak no-op definition of boardInit(), so boards that don't need any
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* special initialization don't have to define their own.
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*
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* How init() works is chip-specific. See the boards_setup.cpp files
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* under e.g. wirish/stm32f1/, wirish/stmf32f2 for the details, but be
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* advised: their contents are unstable, and can/will change without
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* notice.
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*/
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#include <boards.h>
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#include <libmaple/libmaple_types.h>
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#include <libmaple/flash.h>
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#include <libmaple/nvic.h>
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#include <libmaple/systick.h>
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#include "boards_private.h"
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static void setup_flash(void);
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static void setup_clocks(void);
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static void setup_nvic(void);
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static void setup_adcs(void);
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static void setup_timers(void);
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/*
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* Exported functions
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*/
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void init(void) {
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setup_flash();
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setup_clocks();
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setup_nvic();
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systick_init(SYSTICK_RELOAD_VAL);
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wirish::priv::board_setup_gpio();
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setup_adcs();
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setup_timers();
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wirish::priv::board_setup_usb();
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wirish::priv::series_init();
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boardInit();
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}
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/* Provide a default no-op boardInit(). */
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__weak void boardInit(void) {
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}
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/* You could farm this out to the files in boards/ if e.g. it takes
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* too long to test on boards with lots of pins. */
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bool boardUsesPin(uint8 pin) {
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for (int i = 0; i < BOARD_NR_USED_PINS; i++) {
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if (pin == boardUsedPins[i]) {
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return true;
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}
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}
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return false;
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}
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/*
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* Auxiliary routines
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*/
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static void setup_flash(void) {
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// Turn on as many Flash "go faster" features as
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// possible. flash_enable_features() just ignores any flags it
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// can't support.
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flash_enable_features(FLASH_PREFETCH | FLASH_ICACHE | FLASH_DCACHE);
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// Configure the wait states, assuming we're operating at "close
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// enough" to 3.3V.
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flash_set_latency(FLASH_SAFE_WAIT_STATES);
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}
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static void setup_clocks(void) {
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// Turn on HSI. We'll switch to and run off of this while we're
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// setting up the main PLL.
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rcc_turn_on_clk(RCC_CLK_HSI);
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// Turn off and reset the clock subsystems we'll be using, as well
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// as the clock security subsystem (CSS). Note that resetting CFGR
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// to its default value of 0 implies a switch to HSI for SYSCLK.
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RCC_BASE->CFGR = 0x00000000;
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rcc_disable_css();
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rcc_turn_off_clk(RCC_CLK_PLL);
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rcc_turn_off_clk(RCC_CLK_HSE);
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wirish::priv::board_reset_pll();
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// Clear clock readiness interrupt flags and turn off clock
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// readiness interrupts.
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RCC_BASE->CIR = 0x00000000;
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#if !USE_HSI_CLOCK
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// Enable HSE, and wait until it's ready.
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rcc_turn_on_clk(RCC_CLK_HSE);
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while (!rcc_is_clk_ready(RCC_CLK_HSE))
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;
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#endif
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// Configure AHBx, APBx, etc. prescalers and the main PLL.
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wirish::priv::board_setup_clock_prescalers();
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rcc_configure_pll(&wirish::priv::w_board_pll_cfg);
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// Enable the PLL, and wait until it's ready.
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rcc_turn_on_clk(RCC_CLK_PLL);
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while(!rcc_is_clk_ready(RCC_CLK_PLL))
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;
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// Finally, switch to the now-ready PLL as the main clock source.
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rcc_switch_sysclk(RCC_CLKSRC_PLL);
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}
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/*
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* These addresses are where usercode starts when a bootloader is
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* present. If no bootloader is present, the user NVIC usually starts
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* at the Flash base address, 0x08000000.
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*/
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#if defined(BOOTLOADER_maple)
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#define USER_ADDR_ROM 0x08002000
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#else
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#define USER_ADDR_ROM 0x08000000
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#endif
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#define USER_ADDR_RAM 0x20000C00
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extern char __text_start__;
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static void setup_nvic(void) {
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nvic_init((uint32)VECT_TAB_ADDR, 0);
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/* Roger Clark. We now control nvic vector table in boards.txt using the build.vect paramater
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#ifdef VECT_TAB_FLASH
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nvic_init(USER_ADDR_ROM, 0);
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#elif defined VECT_TAB_RAM
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nvic_init(USER_ADDR_RAM, 0);
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#elif defined VECT_TAB_BASE
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nvic_init((uint32)0x08000000, 0);
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#elif defined VECT_TAB_ADDR
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// A numerically supplied value
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nvic_init((uint32)VECT_TAB_ADDR, 0);
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#else
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// Use the __text_start__ value from the linker script; this
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// should be the start of the vector table.
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nvic_init((uint32)&__text_start__, 0);
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#endif
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*/
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}
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static void adc_default_config(adc_dev *dev) {
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adc_enable_single_swstart(dev);
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adc_set_sample_rate(dev, wirish::priv::w_adc_smp);
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}
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static void setup_adcs(void) {
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adc_set_prescaler(wirish::priv::w_adc_pre);
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adc_foreach(adc_default_config);
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}
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static void timer_default_config(timer_dev *dev) {
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timer_adv_reg_map *regs = (dev->regs).adv;
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const uint16 full_overflow = 0xFFFF;
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const uint16 half_duty = 0x8FFF;
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timer_init(dev);
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timer_pause(dev);
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regs->CR1 = TIMER_CR1_ARPE;
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regs->PSC = 1;
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regs->SR = 0;
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regs->DIER = 0;
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regs->EGR = TIMER_EGR_UG;
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switch (dev->type) {
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case TIMER_ADVANCED:
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regs->BDTR = TIMER_BDTR_MOE | TIMER_BDTR_LOCK_OFF;
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// fall-through
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case TIMER_GENERAL:
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timer_set_reload(dev, full_overflow);
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for (uint8 channel = 1; channel <= 4; channel++) {
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if (timer_has_cc_channel(dev, channel)) {
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timer_set_compare(dev, channel, half_duty);
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timer_oc_set_mode(dev, channel, TIMER_OC_MODE_PWM_1,
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TIMER_OC_PE);
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}
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}
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// fall-through
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case TIMER_BASIC:
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break;
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}
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timer_generate_update(dev);
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timer_resume(dev);
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}
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static void setup_timers(void) {
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timer_foreach(timer_default_config);
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}
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