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/******************************************************************************
* The MIT License
*
* Copyright (c) 2010 Perry Hung.
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*****************************************************************************/
/**
* @brief Generic Maple board initialization.
*
* By default, we bring up all Maple boards to 72MHz, clocked off the
* PLL, driven by the 8MHz external crystal. AHB and APB2 are clocked
* at 72MHz. APB1 is clocked at 36MHz.
*/
#include "wirish.h"
#include "flash.h"
#include "rcc.h"
#include "nvic.h"
#include "systick.h"
#include "gpio.h"
#include "adc.h"
#include "timer.h"
#include "usb.h"
static void setupFlash(void);
static void setupClocks(void);
static void setupADC(void);
static void setupTimers(void);
/**
* Board-wide initialization function. Called before main().
*/
void init(void) {
setupFlash();
setupClocks();
nvic_init();
systick_init(SYSTICK_RELOAD_VAL);
gpio_init_all();
afio_init();
setupADC();
setupTimers();
setupUSB();
BOARD_INIT;
}
static void setupFlash(void) {
flash_enable_prefetch();
flash_set_latency(FLASH_WAIT_STATE_2);
}
/*
* Clock setup. Note that some of this only takes effect if we're
* running bare metal and the bootloader hasn't done it for us
* already.
*
* If you change this function, you MUST change the file-level Doxygen
* comment above.
*/
static void setupClocks() {
rcc_clk_init(RCC_CLKSRC_PLL, RCC_PLLSRC_HSE, RCC_PLLMUL_9);
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);
}
/* TODO initialize more ADCs on high density boards. */
static void setupADC() {
adc_init(ADC1, 0);
adc_set_sample_rate(ADC1, ADC_SMPR_55_5); // for high impedance inputs
}
static void timerDefaultConfig(timer_dev*);
static void setupTimers() {
timer_foreach(timerDefaultConfig);
}
static void timerDefaultConfig(timer_dev *dev) {
timer_adv_reg_map *regs = (dev->regs).adv;
const uint16 full_overflow = 0xFFFF;
const uint16 half_duty = 0x8FFF;
timer_init(dev);
timer_pause(dev);
regs->CR1 = TIMER_CR1_ARPE;
regs->PSC = 1;
regs->SR = 0;
regs->DIER = 0;
regs->EGR = TIMER_EGR_UG;
switch (dev->type) {
case TIMER_ADVANCED:
regs->BDTR = TIMER_BDTR_MOE | TIMER_BDTR_LOCK_OFF;
// fall-through
case TIMER_GENERAL:
timer_set_reload(dev, full_overflow);
for (int channel = 1; channel <= 4; channel++) {
timer_set_compare(dev, channel, half_duty);
timer_oc_set_mode(dev, channel, TIMER_OC_MODE_PWM_1, TIMER_OC_PE);
}
// fall-through
case TIMER_BASIC:
break;
}
timer_resume(dev);
}
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