/****************************************************************************** * 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 Implements pretty much only the basic clock setup on the * stm32, clock enable/disable and peripheral reset commands. */ #include "libmaple.h" #include "flash.h" #include "rcc.h" #include "bitband.h" #define APB1 RCC_APB1 #define APB2 RCC_APB2 #define AHB RCC_AHB struct rcc_dev_info { const rcc_clk_domain clk_domain; const uint8 line_num; }; /* Device descriptor table, maps rcc_clk_id onto bus and enable/reset * register bit numbers. */ static const struct rcc_dev_info rcc_dev_table[] = { [RCC_GPIOA] = { .clk_domain = APB2, .line_num = 2 }, [RCC_GPIOB] = { .clk_domain = APB2, .line_num = 3 }, [RCC_GPIOC] = { .clk_domain = APB2, .line_num = 4 }, [RCC_GPIOD] = { .clk_domain = APB2, .line_num = 5 }, [RCC_AFIO] = { .clk_domain = APB2, .line_num = 0 }, [RCC_ADC1] = { .clk_domain = APB2, .line_num = 9 }, [RCC_ADC2] = { .clk_domain = APB2, .line_num = 10 }, [RCC_ADC3] = { .clk_domain = APB2, .line_num = 15 }, [RCC_USART1] = { .clk_domain = APB2, .line_num = 14 }, [RCC_USART2] = { .clk_domain = APB1, .line_num = 17 }, [RCC_USART3] = { .clk_domain = APB1, .line_num = 18 }, [RCC_TIMER1] = { .clk_domain = APB2, .line_num = 11 }, [RCC_TIMER2] = { .clk_domain = APB1, .line_num = 0 }, [RCC_TIMER3] = { .clk_domain = APB1, .line_num = 1 }, [RCC_TIMER4] = { .clk_domain = APB1, .line_num = 2 }, [RCC_SPI1] = { .clk_domain = APB2, .line_num = 12 }, [RCC_SPI2] = { .clk_domain = APB1, .line_num = 14 }, [RCC_DMA1] = { .clk_domain = AHB, .line_num = 0 }, [RCC_PWR] = { .clk_domain = APB1, .line_num = 28}, [RCC_BKP] = { .clk_domain = APB1, .line_num = 27}, [RCC_I2C1] = { .clk_domain = APB1, .line_num = 21 }, [RCC_I2C2] = { .clk_domain = APB1, .line_num = 22 }, [RCC_CRC] = { .clk_domain = AHB, .line_num = 6}, [RCC_FLITF] = { .clk_domain = AHB, .line_num = 4}, [RCC_SRAM] = { .clk_domain = AHB, .line_num = 2}, #if defined(STM32_HIGH_DENSITY) || defined(STM32_XL_DENSITY) [RCC_GPIOE] = { .clk_domain = APB2, .line_num = 6 }, [RCC_GPIOF] = { .clk_domain = APB2, .line_num = 7 }, [RCC_GPIOG] = { .clk_domain = APB2, .line_num = 8 }, [RCC_UART4] = { .clk_domain = APB1, .line_num = 19 }, [RCC_UART5] = { .clk_domain = APB1, .line_num = 20 }, [RCC_TIMER5] = { .clk_domain = APB1, .line_num = 3 }, [RCC_TIMER6] = { .clk_domain = APB1, .line_num = 4 }, [RCC_TIMER7] = { .clk_domain = APB1, .line_num = 5 }, [RCC_TIMER8] = { .clk_domain = APB2, .line_num = 13 }, [RCC_FSMC] = { .clk_domain = AHB, .line_num = 8 }, [RCC_DAC] = { .clk_domain = APB1, .line_num = 29 }, [RCC_DMA2] = { .clk_domain = AHB, .line_num = 1 }, [RCC_SDIO] = { .clk_domain = AHB, .line_num = 10 }, [RCC_SPI3] = { .clk_domain = APB1, .line_num = 15 }, #endif #ifdef STM32_XL_DENSITY [RCC_TIMER9] = { .clk_domain = APB2, .line_num = 19 }, [RCC_TIMER10] = { .clk_domain = APB2, .line_num = 20 }, [RCC_TIMER11] = { .clk_domain = APB2, .line_num = 21 }, [RCC_TIMER12] = { .clk_domain = APB1, .line_num = 6 }, [RCC_TIMER13] = { .clk_domain = APB1, .line_num = 7 }, [RCC_TIMER14] = { .clk_domain = APB1, .line_num = 8 }, #endif }; /** * @brief Initialize the clock control system. Initializes the system * clock source to use the PLL driven by an external oscillator * @param sysclk_src system clock source, must be PLL * @param pll_src pll clock source, must be HSE * @param pll_mul pll multiplier */ void rcc_clk_init(rcc_sysclk_src sysclk_src, rcc_pllsrc pll_src, rcc_pll_multiplier pll_mul) { uint32 cfgr = 0; uint32 cr; /* Assume that we're going to clock the chip off the PLL, fed by * the HSE */ ASSERT(sysclk_src == RCC_CLKSRC_PLL && pll_src == RCC_PLLSRC_HSE); RCC_BASE->CFGR = pll_src | pll_mul; /* Turn on the HSE */ /* FIXME WTF why doesn't bit-banding work here? */ cr = RCC_BASE->CR; cr |= RCC_CR_HSEON; RCC_BASE->CR = cr; while (!(RCC_BASE->CR & RCC_CR_HSERDY)) ; /* Now the PLL */ cr |= RCC_CR_PLLON; RCC_BASE->CR = cr; while (!(RCC_BASE->CR & RCC_CR_PLLRDY)) ; /* Finally, let's switch over to the PLL */ cfgr &= ~RCC_CFGR_SW; cfgr |= RCC_CFGR_SW_PLL; RCC_BASE->CFGR = cfgr; while ((RCC_BASE->CFGR & RCC_CFGR_SWS) != RCC_CFGR_SWS_PLL) ; } /** * @brief Turn on the clock line on a device * @param device Clock ID of the device to turn on. */ void rcc_clk_enable(rcc_clk_id device) { static const __io uint32* enable_regs[] = { [APB1] = &RCC_BASE->APB1ENR, [APB2] = &RCC_BASE->APB2ENR, [AHB] = &RCC_BASE->AHBENR, }; rcc_clk_domain clk_domain = rcc_dev_clk(device); __io uint32* enr = (__io uint32*)enable_regs[clk_domain]; uint8 lnum = rcc_dev_table[device].line_num; bb_peri_set_bit(enr, lnum, 1); } /** * @brief reset a device * @param device Clock ID of the device to reset. */ void rcc_reset_dev(rcc_clk_id device) { static const __io uint32* reset_regs[] = { [APB1] = &RCC_BASE->APB1RSTR, [APB2] = &RCC_BASE->APB2RSTR, }; rcc_clk_domain clk_domain = rcc_dev_clk(device); __io void* addr = (__io void*)reset_regs[clk_domain]; uint8 lnum = rcc_dev_table[device].line_num; bb_peri_set_bit(addr, lnum, 1); bb_peri_set_bit(addr, lnum, 0); } /** * @brief Get a device's clock domain * @param device Device whose clock domain to return * @return Device's clock source */ rcc_clk_domain rcc_dev_clk(rcc_clk_id device) { return rcc_dev_table[device].clk_domain; } /** * @brief Set the divider on a device prescaler * @param prescaler prescaler to set * @param divider prescaler divider */ void rcc_set_prescaler(rcc_prescaler prescaler, uint32 divider) { static const uint32 masks[] = { [RCC_PRESCALER_AHB] = RCC_CFGR_HPRE, [RCC_PRESCALER_APB1] = RCC_CFGR_PPRE1, [RCC_PRESCALER_APB2] = RCC_CFGR_PPRE2, [RCC_PRESCALER_USB] = RCC_CFGR_USBPRE, [RCC_PRESCALER_ADC] = RCC_CFGR_ADCPRE, }; uint32 cfgr = RCC_BASE->CFGR; cfgr &= ~masks[prescaler]; cfgr |= divider; RCC_BASE->CFGR = cfgr; }