611 lines
15 KiB
C
611 lines
15 KiB
C
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/** @defgroup rcc_file RCC peripheral API
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@ingroup peripheral_apis
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@brief <b>libopencm3 STM32L1xx Reset and Clock Control</b>
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@version 1.0.0
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This library supports the Reset and Clock Control System in the STM32L1xx
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series of ARM Cortex Microcontrollers by ST Microelectronics.
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Clock settings and resets for many peripherals are given here rather than in
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the corresponding peripheral library.
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The library also provides a number of common configurations for the processor
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system clock. Not all possible configurations are included.
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*/
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/*
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* This file is part of the libopencm3 project.
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*
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* Copyright (C) 2009 Federico Ruiz-Ugalde <memeruiz at gmail dot com>
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* Copyright (C) 2009 Uwe Hermann <uwe@hermann-uwe.de>
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* Copyright (C) 2010 Thomas Otto <tommi@viadmin.org>
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* Copyright (C) 2012 Karl Palsson <karlp@tweak.net.au>
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*
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* This library is free software: you can redistribute it and/or modify
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* it under the terms of the GNU Lesser General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public License
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* along with this library. If not, see <http://www.gnu.org/licenses/>.
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* Based on the F4 code...
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*/
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/**@{*/
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#include <libopencm3/cm3/assert.h>
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#include <libopencm3/stm32/rcc.h>
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#include <libopencm3/stm32/flash.h>
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#include <libopencm3/stm32/pwr.h>
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/* Set the default clock frequencies after reset. */
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uint32_t rcc_ahb_frequency = 2097000;
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uint32_t rcc_apb1_frequency = 2097000;
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uint32_t rcc_apb2_frequency = 2097000;
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const struct rcc_clock_scale rcc_clock_config[RCC_CLOCK_CONFIG_END] = {
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{ /* 24MHz PLL from HSI */
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.pll_source = RCC_CFGR_PLLSRC_HSI_CLK,
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.pll_mul = RCC_CFGR_PLLMUL_MUL3,
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.pll_div = RCC_CFGR_PLLDIV_DIV2,
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.hpre = RCC_CFGR_HPRE_NODIV,
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.ppre1 = RCC_CFGR_PPRE_NODIV,
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.ppre2 = RCC_CFGR_PPRE_NODIV,
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.voltage_scale = PWR_SCALE1,
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.flash_waitstates = 1,
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.ahb_frequency = 24000000,
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.apb1_frequency = 24000000,
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.apb2_frequency = 24000000,
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},
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{ /* 32MHz PLL from HSI */
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.pll_source = RCC_CFGR_PLLSRC_HSI_CLK,
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.pll_mul = RCC_CFGR_PLLMUL_MUL6,
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.pll_div = RCC_CFGR_PLLDIV_DIV3,
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.hpre = RCC_CFGR_HPRE_NODIV,
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.ppre1 = RCC_CFGR_PPRE_NODIV,
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.ppre2 = RCC_CFGR_PPRE_NODIV,
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.voltage_scale = PWR_SCALE1,
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.flash_waitstates = 1,
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.ahb_frequency = 32000000,
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.apb1_frequency = 32000000,
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.apb2_frequency = 32000000,
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},
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{ /* 16MHz HSI raw */
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.hpre = RCC_CFGR_HPRE_NODIV,
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.ppre1 = RCC_CFGR_PPRE_NODIV,
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.ppre2 = RCC_CFGR_PPRE_NODIV,
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.voltage_scale = PWR_SCALE1,
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.flash_waitstates = 0,
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.ahb_frequency = 16000000,
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.apb1_frequency = 16000000,
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.apb2_frequency = 16000000,
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},
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{ /* 4MHz HSI raw */
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.hpre = RCC_CFGR_HPRE_DIV4,
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.ppre1 = RCC_CFGR_PPRE_NODIV,
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.ppre2 = RCC_CFGR_PPRE_NODIV,
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.voltage_scale = PWR_SCALE1,
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.flash_waitstates = 0,
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.ahb_frequency = 4000000,
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.apb1_frequency = 4000000,
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.apb2_frequency = 4000000,
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},
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{ /* 4MHz MSI raw */
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.hpre = RCC_CFGR_HPRE_NODIV,
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.ppre1 = RCC_CFGR_PPRE_NODIV,
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.ppre2 = RCC_CFGR_PPRE_NODIV,
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.voltage_scale = PWR_SCALE1,
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.flash_waitstates = 0,
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.ahb_frequency = 4194000,
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.apb1_frequency = 4194000,
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.apb2_frequency = 4194000,
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.msi_range = RCC_ICSCR_MSIRANGE_4MHZ,
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},
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{ /* 2MHz MSI raw */
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.hpre = RCC_CFGR_HPRE_NODIV,
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.ppre1 = RCC_CFGR_PPRE_NODIV,
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.ppre2 = RCC_CFGR_PPRE_NODIV,
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.voltage_scale = PWR_SCALE1,
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.flash_waitstates = 0,
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.ahb_frequency = 2097000,
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.apb1_frequency = 2097000,
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.apb2_frequency = 2097000,
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.msi_range = RCC_ICSCR_MSIRANGE_2MHZ,
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},
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};
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void rcc_osc_ready_int_clear(enum rcc_osc osc)
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{
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switch (osc) {
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case RCC_PLL:
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RCC_CIR |= RCC_CIR_PLLRDYC;
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break;
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case RCC_HSE:
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RCC_CIR |= RCC_CIR_HSERDYC;
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break;
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case RCC_HSI:
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RCC_CIR |= RCC_CIR_HSIRDYC;
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break;
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case RCC_LSE:
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RCC_CIR |= RCC_CIR_LSERDYC;
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break;
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case RCC_LSI:
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RCC_CIR |= RCC_CIR_LSIRDYC;
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break;
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case RCC_MSI:
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RCC_CIR |= RCC_CIR_MSIRDYC;
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break;
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}
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}
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void rcc_osc_ready_int_enable(enum rcc_osc osc)
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{
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switch (osc) {
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case RCC_PLL:
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RCC_CIR |= RCC_CIR_PLLRDYIE;
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break;
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case RCC_HSE:
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RCC_CIR |= RCC_CIR_HSERDYIE;
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break;
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case RCC_HSI:
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RCC_CIR |= RCC_CIR_HSIRDYIE;
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break;
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case RCC_LSE:
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RCC_CIR |= RCC_CIR_LSERDYIE;
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break;
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case RCC_LSI:
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RCC_CIR |= RCC_CIR_LSIRDYIE;
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break;
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case RCC_MSI:
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RCC_CIR |= RCC_CIR_MSIRDYIE;
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break;
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}
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}
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void rcc_osc_ready_int_disable(enum rcc_osc osc)
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{
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switch (osc) {
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case RCC_PLL:
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RCC_CIR &= ~RCC_CIR_PLLRDYIE;
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break;
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case RCC_HSE:
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RCC_CIR &= ~RCC_CIR_HSERDYIE;
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break;
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case RCC_HSI:
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RCC_CIR &= ~RCC_CIR_HSIRDYIE;
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break;
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case RCC_LSE:
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RCC_CIR &= ~RCC_CIR_LSERDYIE;
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break;
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case RCC_LSI:
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RCC_CIR &= ~RCC_CIR_LSIRDYIE;
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break;
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case RCC_MSI:
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RCC_CIR &= ~RCC_CIR_MSIRDYIE;
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break;
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}
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}
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int rcc_osc_ready_int_flag(enum rcc_osc osc)
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{
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switch (osc) {
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case RCC_PLL:
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return ((RCC_CIR & RCC_CIR_PLLRDYF) != 0);
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break;
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case RCC_HSE:
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return ((RCC_CIR & RCC_CIR_HSERDYF) != 0);
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break;
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case RCC_HSI:
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return ((RCC_CIR & RCC_CIR_HSIRDYF) != 0);
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break;
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case RCC_LSE:
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return ((RCC_CIR & RCC_CIR_LSERDYF) != 0);
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break;
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case RCC_LSI:
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return ((RCC_CIR & RCC_CIR_LSIRDYF) != 0);
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break;
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case RCC_MSI:
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return ((RCC_CIR & RCC_CIR_MSIRDYF) != 0);
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break;
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}
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/* Shouldn't be reached. */
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return -1;
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}
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void rcc_css_int_clear(void)
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{
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RCC_CIR |= RCC_CIR_CSSC;
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}
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int rcc_css_int_flag(void)
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{
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return ((RCC_CIR & RCC_CIR_CSSF) != 0);
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}
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bool rcc_is_osc_ready(enum rcc_osc osc)
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{
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switch (osc) {
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case RCC_PLL:
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return RCC_CR & RCC_CR_PLLRDY;
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case RCC_HSE:
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return RCC_CR & RCC_CR_HSERDY;
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case RCC_HSI:
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return RCC_CR & RCC_CR_HSIRDY;
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case RCC_MSI:
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return RCC_CR & RCC_CR_MSIRDY;
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case RCC_LSE:
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return RCC_CSR & RCC_CSR_LSERDY;
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case RCC_LSI:
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return RCC_CSR & RCC_CSR_LSIRDY;
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}
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return false;
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}
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void rcc_wait_for_osc_ready(enum rcc_osc osc)
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{
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while (!rcc_is_osc_ready(osc));
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}
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void rcc_wait_for_sysclk_status(enum rcc_osc osc)
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{
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switch (osc) {
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case RCC_PLL:
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while (((RCC_CFGR >> RCC_CFGR_SWS_SHIFT) & RCC_CFGR_SWS_MASK) !=
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RCC_CFGR_SWS_SYSCLKSEL_PLLCLK);
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break;
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case RCC_HSE:
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while (((RCC_CFGR >> RCC_CFGR_SWS_SHIFT) & RCC_CFGR_SWS_MASK) !=
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RCC_CFGR_SWS_SYSCLKSEL_HSECLK);
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break;
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case RCC_HSI:
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while (((RCC_CFGR >> RCC_CFGR_SWS_SHIFT) & RCC_CFGR_SWS_MASK) !=
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RCC_CFGR_SWS_SYSCLKSEL_HSICLK);
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break;
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case RCC_MSI:
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while (((RCC_CFGR >> RCC_CFGR_SWS_SHIFT) & RCC_CFGR_SWS_MASK) !=
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RCC_CFGR_SWS_SYSCLKSEL_MSICLK);
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break;
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default:
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/* Shouldn't be reached. */
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break;
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}
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}
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void rcc_osc_on(enum rcc_osc osc)
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{
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switch (osc) {
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case RCC_PLL:
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RCC_CR |= RCC_CR_PLLON;
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break;
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case RCC_MSI:
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RCC_CR |= RCC_CR_MSION;
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break;
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case RCC_HSE:
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RCC_CR |= RCC_CR_HSEON;
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break;
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case RCC_HSI:
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RCC_CR |= RCC_CR_HSION;
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break;
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case RCC_LSE:
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RCC_CSR |= RCC_CSR_LSEON;
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break;
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case RCC_LSI:
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RCC_CSR |= RCC_CSR_LSION;
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break;
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}
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}
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void rcc_osc_off(enum rcc_osc osc)
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{
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switch (osc) {
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case RCC_PLL:
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RCC_CR &= ~RCC_CR_PLLON;
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break;
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case RCC_MSI:
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RCC_CR &= ~RCC_CR_MSION;
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break;
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case RCC_HSE:
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RCC_CR &= ~RCC_CR_HSEON;
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break;
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case RCC_HSI:
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RCC_CR &= ~RCC_CR_HSION;
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break;
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case RCC_LSE:
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RCC_CSR &= ~RCC_CSR_LSEON;
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break;
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case RCC_LSI:
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RCC_CSR &= ~RCC_CSR_LSION;
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break;
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}
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}
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void rcc_css_enable(void)
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{
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RCC_CR |= RCC_CR_CSSON;
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}
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void rcc_css_disable(void)
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{
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RCC_CR &= ~RCC_CR_CSSON;
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}
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/**
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* Set the range of the MSI oscillator
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* @param range desired range @ref rcc_icscr_msirange
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*/
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void rcc_set_msi_range(uint32_t range)
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{
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uint32_t reg = RCC_ICSCR;
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reg &= ~(RCC_ICSCR_MSIRANGE_MASK << RCC_ICSCR_MSIRANGE_SHIFT);
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reg |= (range << RCC_ICSCR_MSIRANGE_SHIFT);
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RCC_ICSCR = reg;
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}
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void rcc_set_sysclk_source(uint32_t clk)
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{
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uint32_t reg32;
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reg32 = RCC_CFGR;
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reg32 &= ~(RCC_CFGR_SW_MASK << RCC_CFGR_SW_SHIFT);
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RCC_CFGR = (reg32 | clk << RCC_CFGR_SW_SHIFT);
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}
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void rcc_set_pll_configuration(uint32_t source, uint32_t multiplier,
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uint32_t divisor)
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{
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uint32_t reg32;
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reg32 = RCC_CFGR;
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reg32 &= ~(RCC_CFGR_PLLDIV_MASK << RCC_CFGR_PLLDIV_SHIFT);
|
||
|
|
reg32 &= ~(RCC_CFGR_PLLMUL_MASK << RCC_CFGR_PLLMUL_SHIFT);
|
||
|
|
reg32 &= ~(1 << 16);
|
||
|
|
reg32 |= (source << 16);
|
||
|
|
reg32 |= (multiplier << RCC_CFGR_PLLMUL_SHIFT);
|
||
|
|
reg32 |= (divisor << RCC_CFGR_PLLDIV_SHIFT);
|
||
|
|
RCC_CFGR = reg32;
|
||
|
|
}
|
||
|
|
|
||
|
|
void rcc_set_pll_source(uint32_t pllsrc)
|
||
|
|
{
|
||
|
|
uint32_t reg32;
|
||
|
|
|
||
|
|
reg32 = RCC_CFGR;
|
||
|
|
reg32 &= ~(1 << 16);
|
||
|
|
RCC_CFGR = (reg32 | (pllsrc << 16));
|
||
|
|
}
|
||
|
|
|
||
|
|
void rcc_set_ppre2(uint32_t ppre2)
|
||
|
|
{
|
||
|
|
uint32_t reg32;
|
||
|
|
|
||
|
|
reg32 = RCC_CFGR;
|
||
|
|
reg32 &= ~(RCC_CFGR_PPRE2_MASK << RCC_CFGR_PPRE2_SHIFT);
|
||
|
|
RCC_CFGR = (reg32 | (ppre2 << RCC_CFGR_PPRE2_SHIFT));
|
||
|
|
}
|
||
|
|
|
||
|
|
void rcc_set_ppre1(uint32_t ppre1)
|
||
|
|
{
|
||
|
|
uint32_t reg32;
|
||
|
|
|
||
|
|
reg32 = RCC_CFGR;
|
||
|
|
reg32 &= ~(RCC_CFGR_PPRE1_MASK << RCC_CFGR_PPRE1_SHIFT);
|
||
|
|
RCC_CFGR = (reg32 | (ppre1 << RCC_CFGR_PPRE1_SHIFT));
|
||
|
|
}
|
||
|
|
|
||
|
|
void rcc_set_hpre(uint32_t hpre)
|
||
|
|
{
|
||
|
|
uint32_t reg32;
|
||
|
|
|
||
|
|
reg32 = RCC_CFGR;
|
||
|
|
reg32 &= ~(RCC_CFGR_HPRE_MASK << RCC_CFGR_HPRE_SHIFT);
|
||
|
|
RCC_CFGR = (reg32 | (hpre << RCC_CFGR_HPRE_SHIFT));
|
||
|
|
}
|
||
|
|
|
||
|
|
void rcc_set_rtcpre(uint32_t rtcpre)
|
||
|
|
{
|
||
|
|
uint32_t reg32;
|
||
|
|
|
||
|
|
reg32 = RCC_CR;
|
||
|
|
reg32 &= ~(RCC_CR_RTCPRE_MASK << RCC_CR_RTCPRE_SHIFT);
|
||
|
|
RCC_CR = (reg32 | (rtcpre << RCC_CR_RTCPRE_SHIFT));
|
||
|
|
}
|
||
|
|
|
||
|
|
uint32_t rcc_system_clock_source(void)
|
||
|
|
{
|
||
|
|
/* Return the clock source which is used as system clock. */
|
||
|
|
return (RCC_CFGR & 0x000c) >> 2;
|
||
|
|
}
|
||
|
|
|
||
|
|
void rcc_rtc_select_clock(uint32_t clock)
|
||
|
|
{
|
||
|
|
RCC_CSR &= ~(RCC_CSR_RTCSEL_MASK << RCC_CSR_RTCSEL_SHIFT);
|
||
|
|
RCC_CSR |= (clock << RCC_CSR_RTCSEL_SHIFT);
|
||
|
|
}
|
||
|
|
|
||
|
|
void rcc_clock_setup_msi(const struct rcc_clock_scale *clock)
|
||
|
|
{
|
||
|
|
/* Enable internal multi-speed oscillator. */
|
||
|
|
rcc_set_msi_range(clock->msi_range);
|
||
|
|
rcc_osc_on(RCC_MSI);
|
||
|
|
rcc_wait_for_osc_ready(RCC_MSI);
|
||
|
|
|
||
|
|
/* Select MSI as SYSCLK source. */
|
||
|
|
rcc_set_sysclk_source(RCC_CFGR_SW_SYSCLKSEL_MSICLK);
|
||
|
|
|
||
|
|
/*
|
||
|
|
* Set prescalers for AHB, ADC, APB1, APB2.
|
||
|
|
* Do this before touching the PLL (TODO: why?).
|
||
|
|
*/
|
||
|
|
rcc_set_hpre(clock->hpre);
|
||
|
|
rcc_set_ppre1(clock->ppre1);
|
||
|
|
rcc_set_ppre2(clock->ppre2);
|
||
|
|
|
||
|
|
rcc_periph_clock_enable(RCC_PWR);
|
||
|
|
pwr_set_vos_scale(clock->voltage_scale);
|
||
|
|
|
||
|
|
/* I guess this should be in the settings? */
|
||
|
|
flash_64bit_enable();
|
||
|
|
flash_prefetch_enable();
|
||
|
|
flash_set_ws(clock->flash_waitstates);
|
||
|
|
|
||
|
|
/* Set the peripheral clock frequencies used. */
|
||
|
|
rcc_ahb_frequency = clock->ahb_frequency;
|
||
|
|
rcc_apb1_frequency = clock->apb1_frequency;
|
||
|
|
rcc_apb2_frequency = clock->apb2_frequency;
|
||
|
|
}
|
||
|
|
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Switch sysclock to HSI with the given parameters.
|
||
|
|
* This should be usable from any point in time, but only if you have used
|
||
|
|
* library functions to manage clocks. It relies on the global
|
||
|
|
* @ref rcc_ahb_frequency to ensure that it reliably scales voltage up or down
|
||
|
|
* as appropriate.
|
||
|
|
* @param clock full struct with desired parameters
|
||
|
|
*/
|
||
|
|
void rcc_clock_setup_hsi(const struct rcc_clock_scale *clock)
|
||
|
|
{
|
||
|
|
/* Enable internal high-speed oscillator. */
|
||
|
|
rcc_osc_on(RCC_HSI);
|
||
|
|
rcc_periph_clock_enable(RCC_PWR);
|
||
|
|
|
||
|
|
/* I guess this should be in the settings? */
|
||
|
|
flash_64bit_enable();
|
||
|
|
flash_prefetch_enable();
|
||
|
|
|
||
|
|
/* Don't try and go to fast for a voltage range! */
|
||
|
|
if (clock->ahb_frequency > rcc_ahb_frequency) {
|
||
|
|
/* Going up, power up first */
|
||
|
|
pwr_set_vos_scale(clock->voltage_scale);
|
||
|
|
rcc_set_hpre(clock->hpre);
|
||
|
|
rcc_set_ppre1(clock->ppre1);
|
||
|
|
rcc_set_ppre2(clock->ppre2);
|
||
|
|
flash_set_ws(clock->flash_waitstates);
|
||
|
|
} else {
|
||
|
|
/* going down, slow down before cutting power */
|
||
|
|
rcc_set_hpre(clock->hpre);
|
||
|
|
rcc_set_ppre1(clock->ppre1);
|
||
|
|
rcc_set_ppre2(clock->ppre2);
|
||
|
|
flash_set_ws(clock->flash_waitstates);
|
||
|
|
pwr_set_vos_scale(clock->voltage_scale);
|
||
|
|
}
|
||
|
|
|
||
|
|
rcc_wait_for_osc_ready(RCC_HSI);
|
||
|
|
while (PWR_CSR & PWR_CSR_VOSF) {
|
||
|
|
;
|
||
|
|
}
|
||
|
|
rcc_set_sysclk_source(RCC_CFGR_SW_SYSCLKSEL_HSICLK);
|
||
|
|
|
||
|
|
/* Set the peripheral clock frequencies used. */
|
||
|
|
rcc_ahb_frequency = clock->ahb_frequency;
|
||
|
|
rcc_apb1_frequency = clock->apb1_frequency;
|
||
|
|
rcc_apb2_frequency = clock->apb2_frequency;
|
||
|
|
}
|
||
|
|
|
||
|
|
void rcc_clock_setup_pll(const struct rcc_clock_scale *clock)
|
||
|
|
{
|
||
|
|
/* Turn on the appropriate source for the PLL */
|
||
|
|
if (clock->pll_source == RCC_CFGR_PLLSRC_HSE_CLK) {
|
||
|
|
rcc_osc_on(RCC_HSE);
|
||
|
|
rcc_wait_for_osc_ready(RCC_HSE);
|
||
|
|
} else {
|
||
|
|
rcc_osc_on(RCC_HSI);
|
||
|
|
rcc_wait_for_osc_ready(RCC_HSI);
|
||
|
|
}
|
||
|
|
|
||
|
|
/*
|
||
|
|
* Set prescalers for AHB, ADC, APB1, APB2.
|
||
|
|
* Do this before touching the PLL (TODO: why?).
|
||
|
|
*/
|
||
|
|
rcc_set_hpre(clock->hpre);
|
||
|
|
rcc_set_ppre1(clock->ppre1);
|
||
|
|
rcc_set_ppre2(clock->ppre2);
|
||
|
|
|
||
|
|
rcc_periph_clock_enable(RCC_PWR);
|
||
|
|
pwr_set_vos_scale(clock->voltage_scale);
|
||
|
|
|
||
|
|
/* I guess this should be in the settings? */
|
||
|
|
flash_64bit_enable();
|
||
|
|
flash_prefetch_enable();
|
||
|
|
flash_set_ws(clock->flash_waitstates);
|
||
|
|
|
||
|
|
/* Disable PLL oscillator before changing its configuration. */
|
||
|
|
rcc_osc_off(RCC_PLL);
|
||
|
|
|
||
|
|
/* Configure the PLL oscillator. */
|
||
|
|
rcc_set_pll_configuration(clock->pll_source, clock->pll_mul,
|
||
|
|
clock->pll_div);
|
||
|
|
|
||
|
|
/* Enable PLL oscillator and wait for it to stabilize. */
|
||
|
|
rcc_osc_on(RCC_PLL);
|
||
|
|
rcc_wait_for_osc_ready(RCC_PLL);
|
||
|
|
|
||
|
|
/* Select PLL as SYSCLK source. */
|
||
|
|
rcc_set_sysclk_source(RCC_CFGR_SW_SYSCLKSEL_PLLCLK);
|
||
|
|
|
||
|
|
/* Set the peripheral clock frequencies used. */
|
||
|
|
rcc_ahb_frequency = clock->ahb_frequency;
|
||
|
|
rcc_apb1_frequency = clock->apb1_frequency;
|
||
|
|
rcc_apb2_frequency = clock->apb2_frequency;
|
||
|
|
}
|
||
|
|
|
||
|
|
/*---------------------------------------------------------------------------*/
|
||
|
|
/** @brief Get the peripheral clock speed for the USART at base specified.
|
||
|
|
* @param usart Base address of USART to get clock frequency for.
|
||
|
|
*/
|
||
|
|
uint32_t rcc_get_usart_clk_freq(uint32_t usart)
|
||
|
|
{
|
||
|
|
if (usart == USART1_BASE) {
|
||
|
|
return rcc_apb2_frequency;
|
||
|
|
} else {
|
||
|
|
return rcc_apb1_frequency;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
/*---------------------------------------------------------------------------*/
|
||
|
|
/** @brief Get the peripheral clock speed for the Timer at base specified.
|
||
|
|
* @param timer Base address of TIM to get clock frequency for.
|
||
|
|
*/
|
||
|
|
uint32_t rcc_get_timer_clk_freq(uint32_t timer)
|
||
|
|
{
|
||
|
|
/* Handle APB1 timers, and apply multiplier if necessary. */
|
||
|
|
if (timer >= TIM2_BASE && timer <= TIM7_BASE) {
|
||
|
|
uint8_t ppre1 = (RCC_CFGR >> RCC_CFGR_PPRE1_SHIFT) & RCC_CFGR_PPRE1_MASK;
|
||
|
|
return (ppre1 == RCC_CFGR_PPRE1_HCLK_NODIV) ? rcc_apb1_frequency
|
||
|
|
: 2 * rcc_apb1_frequency;
|
||
|
|
} else {
|
||
|
|
uint8_t ppre2 = (RCC_CFGR >> RCC_CFGR_PPRE2_SHIFT) & RCC_CFGR_PPRE2_MASK;
|
||
|
|
return (ppre2 == RCC_CFGR_PPRE2_HCLK_NODIV) ? rcc_apb2_frequency
|
||
|
|
: 2 * rcc_apb2_frequency;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
/*---------------------------------------------------------------------------*/
|
||
|
|
/** @brief Get the peripheral clock speed for the I2C device at base specified.
|
||
|
|
* @param i2c Base address of I2C to get clock frequency for.
|
||
|
|
*/
|
||
|
|
uint32_t rcc_get_i2c_clk_freq(uint32_t i2c __attribute__((unused)))
|
||
|
|
{
|
||
|
|
return rcc_apb1_frequency;
|
||
|
|
}
|
||
|
|
|
||
|
|
/*---------------------------------------------------------------------------*/
|
||
|
|
/** @brief Get the peripheral clock speed for the SPI device at base specified.
|
||
|
|
* @param spi Base address of SPI device to get clock frequency for (e.g. SPI1_BASE).
|
||
|
|
*/
|
||
|
|
uint32_t rcc_get_spi_clk_freq(uint32_t spi) {
|
||
|
|
if (spi == SPI1_BASE) {
|
||
|
|
return rcc_apb2_frequency;
|
||
|
|
} else {
|
||
|
|
return rcc_apb1_frequency;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
/**@}*/
|