From 21468a69ca2e7ff9a5c7ffc03c608a24f1412d64 Mon Sep 17 00:00:00 2001 From: Marti Bolivar Date: Tue, 20 Mar 2012 17:44:34 -0400 Subject: [FIXME] Resurrect boards.cpp for F2 and F1. FIXME: - F1 support currently appears to be failing in start_c.c, for some unknown reason. This will need to get sorted out later. Add a new wirish namespace, and a sub-namespace wirish::priv::. Put a bunch of board setup routines in this namespace, and declare them in new wirish/boards_private.h. boards.cpp uses this to perform initialization tasks in a portable way, with two new boards_setup.cpp files under wirish/stm32f1 and wirish/stm32f2 handling the series-specific details. Signed-off-by: Marti Bolivar --- wirish/boards.cpp | 167 ++++++++++++++++++++++++------------------------------ 1 file changed, 74 insertions(+), 93 deletions(-) (limited to 'wirish/boards.cpp') diff --git a/wirish/boards.cpp b/wirish/boards.cpp index 5d5ecb5..7d783db 100644 --- a/wirish/boards.cpp +++ b/wirish/boards.cpp @@ -25,49 +25,55 @@ *****************************************************************************/ /** - * @brief Generic board initialization routines. + * @file boards.cpp + * @brief Generic board routines. * * This file is mostly interesting for the init() function, which * configures Flash, the core sytem clocks, and a variety of other * available peripherals on the board so the rest of Wirish doesn't * have to turn things on before using them. * - * Prior to returning, init() calls boardInit(), which allows boards - * to perform any initialization they need to. + * How init() does this is chip-specific. See the chip-specific pieces + * of Wirish (under e.g. wirish/stm32f1/, wirish/stmf32f2) for + * details. * - * Specifically how init() works varies across boards and MCUs. + * Finally, prior to returning, init() calls boardInit(), which allows + * boards to perform any initialization they need to. This file + * includes a weak no-op definition of boardInit(), so boards that + * don't need any special initialization don't have to define their + * own. */ #include - #include -#include #include #include -#include -#include -#include -#include +#include "boards_private.h" + +static void setup_flash(void); +static void setup_clocks(void); +static void setup_nvic(void); -static void setupFlash(void); -static void setupClocks(void); -static void setupNVIC(void); -static void setupADC(void); -static void setupTimers(void); +/* + * Exported functions + */ void init(void) { - setupFlash(); - setupClocks(); - setupNVIC(); + setup_flash(); + setup_clocks(); + setup_nvic(); systick_init(SYSTICK_RELOAD_VAL); - gpio_init_all(); - afio_init(); - setupADC(); - setupTimers(); - usb_cdcacm_enable(BOARD_USB_DISC_DEV, BOARD_USB_DISC_BIT); + wirish::priv::board_setup_gpio(); + wirish::priv::board_setup_adc(); + wirish::priv::board_setup_timers(); + wirish::priv::board_setup_usb(); boardInit(); } +/* Provide a default boardInit(). */ +__attribute__((weak)) void boardInit(void) { +} + /* You could farm this out to the files in boards/ if e.g. it takes * too long to test on Maple Native (all those FSMC pins...). */ bool boardUsesPin(uint8 pin) { @@ -79,24 +85,56 @@ bool boardUsesPin(uint8 pin) { return false; } -static void setupFlash(void) { - flash_enable_prefetch(); +/* + * Auxiliary routines + */ + +static void setup_flash(void) { + // Turn on as many Flash "go faster" features as + // possible. flash_enable_features() just ignores any flags it + // can't support. + flash_enable_features(FLASH_PREFETCH | FLASH_ICACHE | FLASH_DCACHE); + // Configure the wait states, assuming we're operating at "close + // enough" to 3.3V. flash_set_latency(FLASH_SAFE_WAIT_STATES); } -/* - * 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. - */ -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); +static void setup_clocks(void) { + // Turn on HSI. We'll switch to and run off of this while we're + // setting up the main PLL. + rcc_turn_on_clk(RCC_CLK_HSI); + + // Turn off and reset the clock subsystems we'll be using, as well + // as the clock security subsystem (CSS). Note that resetting CFGR + // to its default value of 0 implies a switch to HSI for SYSCLK. + RCC_BASE->CFGR = 0x00000000; + rcc_disable_css(); + rcc_turn_off_clk(RCC_CLK_PLL); + rcc_turn_off_clk(RCC_CLK_HSE); + wirish::priv::board_reset_pll(); + // Clear clock readiness interrupt flags and turn off clock + // readiness interrupts. + RCC_BASE->CIR = 0x00000000; + + // Enable HSE, and wait until it's ready. + rcc_turn_on_clk(RCC_CLK_HSE); + while (!rcc_is_clk_ready(RCC_CLK_HSE)) + ; + + // Configure AHBx, APBx, etc. prescalers and the main PLL. + wirish::priv::board_setup_clock_prescalers(); + rcc_configure_pll(&wirish::priv::board_pll_cfg); + + // Enable the PLL, and wait until it's ready. + rcc_turn_on_clk(RCC_CLK_PLL); + while(!rcc_is_clk_ready(RCC_CLK_PLL)) + ; + + // Finally, switch to the now-ready PLL as the main clock source. + rcc_switch_sysclk(RCC_CLKSRC_PLL); } -static void setupNVIC() { +static void setup_nvic(void) { #ifdef VECT_TAB_FLASH nvic_init(USER_ADDR_ROM, 0); #elif defined VECT_TAB_RAM @@ -107,60 +145,3 @@ static void setupNVIC() { #error "You must select a base address for the vector table." #endif } - -static void adcDefaultConfig(const adc_dev* dev); - -static void setupADC() { - rcc_set_prescaler(RCC_PRESCALER_ADC, RCC_ADCPRE_PCLK_DIV_6); - adc_foreach(adcDefaultConfig); -} - -static void timerDefaultConfig(timer_dev*); - -static void setupTimers() { - timer_foreach(timerDefaultConfig); -} - -static void adcDefaultConfig(const adc_dev *dev) { - adc_init(dev); - - adc_set_extsel(dev, ADC_SWSTART); - adc_set_exttrig(dev, true); - - adc_enable(dev); - adc_calibrate(dev); - adc_set_sample_rate(dev, ADC_SMPR_55_5); -} - -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); -} -- cgit v1.2.3