diff options
Diffstat (limited to 'libopencm3/lib/stm32/f3/rcc.c')
| -rw-r--r-- | libopencm3/lib/stm32/f3/rcc.c | 465 |
1 files changed, 465 insertions, 0 deletions
diff --git a/libopencm3/lib/stm32/f3/rcc.c b/libopencm3/lib/stm32/f3/rcc.c new file mode 100644 index 0000000..8291a2b --- /dev/null +++ b/libopencm3/lib/stm32/f3/rcc.c @@ -0,0 +1,465 @@ +/** @defgroup rcc_file RCC + * + * @ingroup STM32F3xx + * + * @brief <b>libopencm3 STM32F3xx Reset and Clock Control</b> + * + * @version 1.0.0 + * + * @date 11 July 2013 + * + * LGPL License Terms @ref lgpl_license + */ +/* + * This file is part of the libopencm3 project. + * + * Copyright (C) 2009 Federico Ruiz-Ugalde <memeruiz at gmail dot com> + * Copyright (C) 2009 Uwe Hermann <uwe@hermann-uwe.de> + * Copyright (C) 2010 Thomas Otto <tommi@viadmin.org> + * Modified by 2013 Fernando Cortes <fernando.corcam@gmail.com> (stm32f3) + * Modified by 2013 Guillermo Rivera <memogrg@gmail.com> (stm32f3) + * + * This library is free software: you can redistribute it and/or modify + * it under the terms of the GNU Lesser General Public License as published by + * the Free Software Foundation, either version 3 of the License, or + * (at your option) any later version. + * + * This library is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU Lesser General Public License for more details. + * + * You should have received a copy of the GNU Lesser General Public License + * along with this library. If not, see <http://www.gnu.org/licenses/>. + */ +/**@{*/ + +#include <libopencm3/cm3/assert.h> +#include <libopencm3/stm32/rcc.h> +#include <libopencm3/stm32/flash.h> +#include <libopencm3/stm32/i2c.h> + +/* Set the default ppre1 and ppre2 peripheral clock frequencies after reset. */ +uint32_t rcc_ppre1_frequency = 8000000; +uint32_t rcc_ppre2_frequency = 8000000; + +const clock_scale_t hsi_8mhz[CLOCK_END] = { + { /* 44MHz */ + .pll = RCC_CFGR_PLLMUL_PLL_IN_CLK_X11, + .pllsrc = RCC_CFGR_PLLSRC_HSI_DIV2, + .hpre = RCC_CFGR_HPRE_DIV_NONE, + .ppre1 = RCC_CFGR_PPRE1_DIV_2, + .ppre2 = RCC_CFGR_PPRE2_DIV_NONE, + .power_save = 1, + .flash_config = FLASH_ACR_PRFTBE | FLASH_ACR_LATENCY_1WS, + .apb1_frequency = 22000000, + .apb2_frequency = 44000000, + }, + { /* 48MHz */ + .pll = RCC_CFGR_PLLMUL_PLL_IN_CLK_X12, + .pllsrc = RCC_CFGR_PLLSRC_HSI_DIV2, + .hpre = RCC_CFGR_HPRE_DIV_NONE, + .ppre1 = RCC_CFGR_PPRE1_DIV_2, + .ppre2 = RCC_CFGR_PPRE2_DIV_NONE, + .power_save = 1, + .flash_config = FLASH_ACR_PRFTBE | FLASH_ACR_LATENCY_1WS, + .apb1_frequency = 24000000, + .apb2_frequency = 48000000, + }, + { /* 64MHz */ + .pll = RCC_CFGR_PLLMUL_PLL_IN_CLK_X16, + .pllsrc = RCC_CFGR_PLLSRC_HSI_DIV2, + .hpre = RCC_CFGR_HPRE_DIV_NONE, + .ppre1 = RCC_CFGR_PPRE1_DIV_2, + .ppre2 = RCC_CFGR_PPRE2_DIV_NONE, + .power_save = 1, + .flash_config = FLASH_ACR_PRFTBE | FLASH_ACR_LATENCY_2WS, + .apb1_frequency = 32000000, + .apb2_frequency = 64000000, + } +}; + +void rcc_osc_ready_int_clear(enum osc osc) +{ + switch (osc) { + case PLL: + RCC_CIR |= RCC_CIR_PLLRDYC; + break; + case HSE: + RCC_CIR |= RCC_CIR_HSERDYC; + break; + case HSI: + RCC_CIR |= RCC_CIR_HSIRDYC; + break; + case LSE: + RCC_CIR |= RCC_CIR_LSERDYC; + break; + case LSI: + RCC_CIR |= RCC_CIR_LSIRDYC; + break; + } +} + +void rcc_osc_ready_int_enable(enum osc osc) +{ + switch (osc) { + case PLL: + RCC_CIR |= RCC_CIR_PLLRDYIE; + break; + case HSE: + RCC_CIR |= RCC_CIR_HSERDYIE; + break; + case HSI: + RCC_CIR |= RCC_CIR_HSIRDYIE; + break; + case LSE: + RCC_CIR |= RCC_CIR_LSERDYIE; + break; + case LSI: + RCC_CIR |= RCC_CIR_LSIRDYIE; + break; + } +} + +void rcc_osc_ready_int_disable(enum osc osc) +{ + switch (osc) { + case PLL: + RCC_CIR &= ~RCC_CIR_PLLRDYIE; + break; + case HSE: + RCC_CIR &= ~RCC_CIR_HSERDYIE; + break; + case HSI: + RCC_CIR &= ~RCC_CIR_HSIRDYIE; + break; + case LSE: + RCC_CIR &= ~RCC_CIR_LSERDYIE; + break; + case LSI: + RCC_CIR &= ~RCC_CIR_LSIRDYIE; + break; + } +} + +int rcc_osc_ready_int_flag(enum osc osc) +{ + switch (osc) { + case PLL: + return ((RCC_CIR & RCC_CIR_PLLRDYF) != 0); + break; + case HSE: + return ((RCC_CIR & RCC_CIR_HSERDYF) != 0); + break; + case HSI: + return ((RCC_CIR & RCC_CIR_HSIRDYF) != 0); + break; + case LSE: + return ((RCC_CIR & RCC_CIR_LSERDYF) != 0); + break; + case LSI: + return ((RCC_CIR & RCC_CIR_LSIRDYF) != 0); + break; + } + + cm3_assert_not_reached(); +} + +void rcc_css_int_clear(void) +{ + RCC_CIR |= RCC_CIR_CSSC; +} + +int rcc_css_int_flag(void) +{ + return ((RCC_CIR & RCC_CIR_CSSF) != 0); +} + +void rcc_wait_for_osc_ready(enum osc osc) +{ + switch (osc) { + case PLL: + while ((RCC_CR & RCC_CR_PLLRDY) == 0); + break; + case HSE: + while ((RCC_CR & RCC_CR_HSERDY) == 0); + break; + case HSI: + while ((RCC_CR & RCC_CR_HSIRDY) == 0); + break; + case LSE: + while ((RCC_BDCR & RCC_BDCR_LSERDY) == 0); + break; + case LSI: + while ((RCC_CSR & RCC_CSR_LSIRDY) == 0); + break; + } +} + + +void rcc_wait_for_osc_not_ready(enum osc osc) +{ + switch (osc) { + case PLL: + while ((RCC_CR & RCC_CR_PLLRDY) != 0); + break; + case HSE: + while ((RCC_CR & RCC_CR_HSERDY) != 0); + break; + case HSI: + while ((RCC_CR & RCC_CR_HSIRDY) != 0); + break; + case LSE: + while ((RCC_BDCR & RCC_BDCR_LSERDY) != 0); + break; + case LSI: + while ((RCC_CSR & RCC_CSR_LSIRDY) != 0); + break; + } +} + +void rcc_wait_for_sysclk_status(enum osc osc) +{ + switch (osc) { + case PLL: + while ((RCC_CFGR & ((1 << 1) | (1 << 0))) != RCC_CFGR_SWS_PLL); + break; + case HSE: + while ((RCC_CFGR & ((1 << 1) | (1 << 0))) != RCC_CFGR_SWS_HSE); + break; + case HSI: + while ((RCC_CFGR & ((1 << 1) | (1 << 0))) != RCC_CFGR_SWS_HSI); + break; + default: + /* Shouldn't be reached. */ + break; + } +} + +void rcc_osc_on(enum osc osc) +{ + switch (osc) { + case PLL: + RCC_CR |= RCC_CR_PLLON; + break; + case HSE: + RCC_CR |= RCC_CR_HSEON; + break; + case HSI: + RCC_CR |= RCC_CR_HSION; + break; + case LSE: + RCC_BDCR |= RCC_BDCR_LSEON; + break; + case LSI: + RCC_CSR |= RCC_CSR_LSION; + break; + } +} + +void rcc_osc_off(enum osc osc) +{ + switch (osc) { + case PLL: + RCC_CR &= ~RCC_CR_PLLON; + break; + case HSE: + RCC_CR &= ~RCC_CR_HSEON; + break; + case HSI: + RCC_CR &= ~RCC_CR_HSION; + break; + case LSE: + RCC_BDCR &= ~RCC_BDCR_LSEON; + break; + case LSI: + RCC_CSR &= ~RCC_CSR_LSION; + break; + } +} + +void rcc_css_enable(void) +{ + RCC_CR |= RCC_CR_CSSON; +} + +void rcc_css_disable(void) +{ + RCC_CR &= ~RCC_CR_CSSON; +} + +void rcc_osc_bypass_enable(enum osc osc) +{ + switch (osc) { + case HSE: + RCC_CR |= RCC_CR_HSEBYP; + break; + case LSE: + RCC_BDCR |= RCC_BDCR_LSEBYP; + break; + case PLL: + case HSI: + case LSI: + /* Do nothing, only HSE/LSE allowed here. */ + break; + } +} + +void rcc_osc_bypass_disable(enum osc osc) +{ + switch (osc) { + case HSE: + RCC_CR &= ~RCC_CR_HSEBYP; + break; + case LSE: + RCC_BDCR &= ~RCC_BDCR_LSEBYP; + break; + case PLL: + case HSI: + case LSI: + /* Do nothing, only HSE/LSE allowed here. */ + break; + } +} + +void rcc_set_sysclk_source(uint32_t clk) +{ + uint32_t reg32; + + reg32 = RCC_CFGR; + reg32 &= ~((1 << 1) | (1 << 0)); + RCC_CFGR = (reg32 | clk); +} + +void rcc_set_pll_source(uint32_t pllsrc) +{ + uint32_t reg32; + + reg32 = RCC_CFGR; + reg32 &= ~RCC_CFGR_PLLSRC; + RCC_CFGR = (reg32 | (pllsrc << 16)); +} + +void rcc_set_ppre2(uint32_t ppre2) +{ + uint32_t reg32; + + reg32 = RCC_CFGR; + reg32 &= ~((1 << 13) | (1 << 14) | (1 << 15)); + RCC_CFGR = (reg32 | (ppre2 << 11)); +} + +void rcc_set_ppre1(uint32_t ppre1) +{ + uint32_t reg32; + + reg32 = RCC_CFGR; + reg32 &= ~((1 << 10) | (1 << 11) | (1 << 12)); + RCC_CFGR = (reg32 | (ppre1 << 8)); +} + +void rcc_set_hpre(uint32_t hpre) +{ + uint32_t reg32; + + reg32 = RCC_CFGR; + reg32 &= ~((1 << 4) | (1 << 5) | (1 << 6) | (1 << 7)); + RCC_CFGR = (reg32 | (hpre << 4)); +} + + +void rcc_set_main_pll_hsi(uint32_t pll) +{ + RCC_CFGR = (~RCC_CFGR_PLLMUL_MASK & RCC_CFGR) | + (pll << RCC_CFGR_PLLMUL_SHIFT); +} + + +uint32_t rcc_get_system_clock_source(void) +{ + /* Return the clock source which is used as system clock. */ + return (RCC_CFGR & 0x000c) >> 2; +} + + +void rcc_clock_setup_hsi(const clock_scale_t *clock) +{ + /* Enable internal high-speed oscillator. */ + rcc_osc_on(HSI); + rcc_wait_for_osc_ready(HSI); + /* Select HSI as SYSCLK source. */ + rcc_set_sysclk_source(RCC_CFGR_SW_HSI); /* XXX: se cayo */ + rcc_wait_for_sysclk_status(HSI); + + rcc_osc_off(PLL); + rcc_wait_for_osc_not_ready(PLL); + rcc_set_pll_source(clock->pllsrc); + rcc_set_main_pll_hsi(clock->pll); + /* Enable PLL oscillator and wait for it to stabilize. */ + rcc_osc_on(PLL); + rcc_wait_for_osc_ready(PLL); + /* + * Set prescalers for AHB, ADC, ABP1, ABP2. + * Do this before touching the PLL (TODO: why?). + */ + rcc_set_hpre(clock->hpre); + rcc_set_ppre2(clock->ppre2); + rcc_set_ppre1(clock->ppre1); + /* Configure flash settings. */ + flash_set_ws(clock->flash_config); + /* Select PLL as SYSCLK source. */ + rcc_set_sysclk_source(RCC_CFGR_SW_PLL); /* XXX: se cayo */ + /* Wait for PLL clock to be selected. */ + rcc_wait_for_sysclk_status(PLL); + + /* Set the peripheral clock frequencies used. */ + rcc_ppre1_frequency = clock->apb1_frequency; + rcc_ppre2_frequency = clock->apb2_frequency; +} + + +void rcc_backupdomain_reset(void) +{ + /* Set the backup domain software reset. */ + RCC_BDCR |= RCC_BDCR_BDRST; + + /* Clear the backup domain software reset. */ + RCC_BDCR &= ~RCC_BDCR_BDRST; +} + +void rcc_set_i2c_clock_hsi(uint32_t i2c) +{ + if (i2c == I2C1) { + RCC_CFGR3 &= ~RCC_CFGR3_I2C1SW; + } + if (i2c == I2C2) { + RCC_CFGR3 &= ~RCC_CFGR3_I2C2SW; + } +} + +void rcc_set_i2c_clock_sysclk(uint32_t i2c) +{ + if (i2c == I2C1) { + RCC_CFGR3 |= RCC_CFGR3_I2C1SW; + } + if (i2c == I2C2) { + RCC_CFGR3 |= RCC_CFGR3_I2C2SW; + } +} + +uint32_t rcc_get_i2c_clocks(void) +{ + return RCC_CFGR3 & (RCC_CFGR3_I2C1SW | RCC_CFGR3_I2C2SW); +} + +void rcc_usb_prescale_1_5(void) +{ + RCC_CFGR &= ~RCC_CFGR_USBPRES; +} + +void rcc_usb_prescale_1(void) +{ + RCC_CFGR |= RCC_CFGR_USBPRES; +} +/**@}*/ + |