diff options
Diffstat (limited to 'nuttx/arch/arm/src/stm32/stm32f10xxx_rcc.c')
-rw-r--r-- | nuttx/arch/arm/src/stm32/stm32f10xxx_rcc.c | 556 |
1 files changed, 556 insertions, 0 deletions
diff --git a/nuttx/arch/arm/src/stm32/stm32f10xxx_rcc.c b/nuttx/arch/arm/src/stm32/stm32f10xxx_rcc.c new file mode 100644 index 000000000..516b026fb --- /dev/null +++ b/nuttx/arch/arm/src/stm32/stm32f10xxx_rcc.c @@ -0,0 +1,556 @@ +/**************************************************************************** + * arch/arm/src/stm32/stm32f10xxx_rcc.c + * + * Copyright (C) 2009, 2011-2012 Gregory Nutt. All rights reserved. + * Author: Gregory Nutt <gnutt@nuttx.org> + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in + * the documentation and/or other materials provided with the + * distribution. + * 3. Neither the name NuttX nor the names of its contributors may be + * used to endorse or promote products derived from this software + * without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS + * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT + * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS + * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE + * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, + * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, + * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS + * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED + * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT + * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN + * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE + * POSSIBILITY OF SUCH DAMAGE. + * + ****************************************************************************/ + +/**************************************************************************** + * Included Files + ****************************************************************************/ + +/**************************************************************************** + * Definitions + ****************************************************************************/ + +/* Allow up to 100 milliseconds for the high speed clock to become ready. + * that is a very long delay, but if the clock does not become ready we are + * hosed anyway. Normally this is very fast, but I have seen at least one + * board that required this long, long timeout for the HSE to be ready. + */ + +#define HSERDY_TIMEOUT (100 * CONFIG_BOARD_LOOPSPERMSEC) + +/**************************************************************************** + * Private Data + ****************************************************************************/ + +/**************************************************************************** + * Private Functions + ****************************************************************************/ + +/**************************************************************************** + * Name: rcc_reset + * + * Description: + * Put all RCC registers in reset state + * + ****************************************************************************/ + +static inline void rcc_reset(void) +{ + uint32_t regval; + + putreg32(0, STM32_RCC_APB2RSTR); /* Disable APB2 Peripheral Reset */ + putreg32(0, STM32_RCC_APB1RSTR); /* Disable APB1 Peripheral Reset */ + putreg32(RCC_AHBENR_FLITFEN|RCC_AHBENR_SRAMEN, STM32_RCC_AHBENR); /* FLITF and SRAM Clock ON */ + putreg32(0, STM32_RCC_APB2ENR); /* Disable APB2 Peripheral Clock */ + putreg32(0, STM32_RCC_APB1ENR); /* Disable APB1 Peripheral Clock */ + + regval = getreg32(STM32_RCC_CR); /* Set the HSION bit */ + regval |= RCC_CR_HSION; + putreg32(regval, STM32_RCC_CR); + + regval = getreg32(STM32_RCC_CFGR); /* Reset SW, HPRE, PPRE1, PPRE2, ADCPRE and MCO bits */ + regval &= ~(RCC_CFGR_SW_MASK|RCC_CFGR_HPRE_MASK|RCC_CFGR_PPRE1_MASK|RCC_CFGR_PPRE2_MASK|RCC_CFGR_ADCPRE_MASK|RCC_CFGR_MCO_MASK); + putreg32(regval, STM32_RCC_CFGR); + + regval = getreg32(STM32_RCC_CR); /* Reset HSEON, CSSON and PLLON bits */ + regval &= ~(RCC_CR_HSEON|RCC_CR_CSSON|RCC_CR_PLLON); + putreg32(regval, STM32_RCC_CR); + + regval = getreg32(STM32_RCC_CR); /* Reset HSEBYP bit */ + regval &= ~RCC_CR_HSEBYP; + putreg32(regval, STM32_RCC_CR); + + regval = getreg32(STM32_RCC_CFGR); /* Reset PLLSRC, PLLXTPRE, PLLMUL and USBPRE bits */ + regval &= ~(RCC_CFGR_PLLSRC|RCC_CFGR_PLLXTPRE|RCC_CFGR_PLLMUL_MASK|RCC_CFGR_USBPRE); + putreg32(regval, STM32_RCC_CFGR); + + putreg32(0, STM32_RCC_CIR); /* Disable all interrupts */ +} + +/**************************************************************************** + * Name: rcc_enableahb + * + * Description: + * Enable selected AHB peripherals + * + ****************************************************************************/ + +static inline void rcc_enableahb(void) +{ + uint32_t regval; + + /* Always enable FLITF clock and SRAM clock */ + + regval = RCC_AHBENR_FLITFEN|RCC_AHBENR_SRAMEN; + +#ifdef CONFIG_STM32_DMA1 + /* DMA 1 clock enable */ + + regval |= RCC_AHBENR_DMA1EN; +#endif + +#ifdef CONFIG_STM32_DMA2 + /* DMA 2 clock enable */ + + regval |= RCC_AHBENR_DMA2EN; +#endif + +#ifdef CONFIG_STM32_CRC + /* CRC clock enable */ + + regval |= RCC_AHBENR_CRCEN; +#endif + +#ifdef CONFIG_STM32_FSMC + /* FSMC clock enable */ + + regval |= RCC_AHBENR_FSMCEN; +#endif + +#ifdef CONFIG_STM32_SDIO + /* SDIO clock enable */ + + regval |= RCC_AHBENR_SDIOEN; +#endif + + putreg32(regval, STM32_RCC_AHBENR); /* Enable peripherals */ +} + +/**************************************************************************** + * Name: rcc_enableapb1 + * + * Description: + * Enable selected APB1 peripherals + * + ****************************************************************************/ + +static inline void rcc_enableapb1(void) +{ + uint32_t regval; + +#ifdef CONFIG_STM32_USB + /* USB clock divider. This bit must be valid before enabling the USB + * clock in the RCC_APB1ENR register. This bit can’t be reset if the USB + * clock is enabled. + */ + + regval = getreg32(STM32_RCC_CFGR); + regval &= ~RCC_CFGR_USBPRE; + regval |= STM32_CFGR_USBPRE; + putreg32(regval, STM32_RCC_CFGR); +#endif + + /* Set the appropriate bits in the APB1ENR register to enabled the + * selected APB1 peripherals. + */ + + regval = getreg32(STM32_RCC_APB1ENR); +#ifdef CONFIG_STM32_TIM2 + /* Timer 2 clock enable */ +#ifdef CONFIG_STM32_FORCEPOWER + regval |= RCC_APB1ENR_TIM2EN; +#endif +#endif + +#ifdef CONFIG_STM32_TIM3 + /* Timer 3 clock enable */ +#ifdef CONFIG_STM32_FORCEPOWER + regval |= RCC_APB1ENR_TIM3EN; +#endif +#endif + +#ifdef CONFIG_STM32_TIM4 + /* Timer 4 clock enable */ +#ifdef CONFIG_STM32_FORCEPOWER + regval |= RCC_APB1ENR_TIM4EN; +#endif +#endif + +#ifdef CONFIG_STM32_TIM5 + /* Timer 5 clock enable */ +#ifdef CONFIG_STM32_FORCEPOWER + regval |= RCC_APB1ENR_TIM5EN; +#endif +#endif + +#ifdef CONFIG_STM32_TIM6 + /* Timer 6 clock enable */ +#ifdef CONFIG_STM32_FORCEPOWER + regval |= RCC_APB1ENR_TIM6EN; +#endif +#endif + +#ifdef CONFIG_STM32_TIM7 + /* Timer 7 clock enable */ +#ifdef CONFIG_STM32_FORCEPOWER + regval |= RCC_APB1ENR_TIM7EN; +#endif +#endif + +#ifdef CONFIG_STM32_WWDG + /* Window Watchdog clock enable */ + + regval |= RCC_APB1ENR_WWDGEN; +#endif + +#ifdef CONFIG_STM32_SPI2 + /* SPI 2 clock enable */ + + regval |= RCC_APB1ENR_SPI2EN; +#endif + +#ifdef CONFIG_STM32_SPI3 + /* SPI 3 clock enable */ + + regval |= RCC_APB1ENR_SPI3EN; +#endif + +#ifdef CONFIG_STM32_USART2 + /* USART 2 clock enable */ + + regval |= RCC_APB1ENR_USART2EN; +#endif + +#ifdef CONFIG_STM32_USART3 + /* USART 3 clock enable */ + + regval |= RCC_APB1ENR_USART3EN; +#endif + +#ifdef CONFIG_STM32_UART4 + /* UART 4 clock enable */ + + regval |= RCC_APB1ENR_UART4EN; +#endif + +#ifdef CONFIG_STM32_UART5 + /* UART 5 clock enable */ + + regval |= RCC_APB1ENR_UART5EN; +#endif + +#ifdef CONFIG_STM32_I2C1 + /* I2C 1 clock enable */ +#ifdef CONFIG_STM32_FORCEPOWER + regval |= RCC_APB1ENR_I2C1EN; +#endif +#endif + +#ifdef CONFIG_STM32_I2C2 + /* I2C 2 clock enable */ +#ifdef CONFIG_STM32_FORCEPOWER + regval |= RCC_APB1ENR_I2C2EN; +#endif +#endif + +#ifdef CONFIG_STM32_USB + /* USB clock enable */ + + regval |= RCC_APB1ENR_USBEN; +#endif + +#ifdef CONFIG_STM32_CAN1 + /* CAN1 clock enable */ + + regval |= RCC_APB1ENR_CAN1EN; +#endif + +#ifdef CONFIG_STM32_CAN2 + /* CAN2 clock enable. NOTE: CAN2 needs CAN1 clock as well. */ + + regval |= (RCC_APB1ENR_CAN1EN | RCC_APB1ENR_CAN2EN); +#endif + +#ifdef CONFIG_STM32_BKP + /* Backup interface clock enable */ + + regval |= RCC_APB1ENR_BKPEN; +#endif + +#ifdef CONFIG_STM32_PWR + /* Power interface clock enable */ + + regval |= RCC_APB1ENR_PWREN; +#endif + +#if defined(CONFIG_STM32_DAC1) || defined(CONFIG_STM32_DAC2) + /* DAC interface clock enable */ + + regval |= RCC_APB1ENR_DACEN; +#endif + putreg32(regval, STM32_RCC_APB1ENR); +} + +/**************************************************************************** + * Name: rcc_enableapb2 + * + * Description: + * Enable selected APB2 peripherals + * + ****************************************************************************/ + +static inline void rcc_enableapb2(void) +{ + uint32_t regval; + + /* Set the appropriate bits in the APB2ENR register to enabled the + * selected APB2 peripherals. + */ + + /* Enable GPIOA, GPIOB, ... and AFIO clocks */ + + regval = getreg32(STM32_RCC_APB2ENR); + regval |= (RCC_APB2ENR_AFIOEN +#if STM32_NGPIO > 0 + |RCC_APB2ENR_IOPAEN +#endif +#if STM32_NGPIO > 16 + |RCC_APB2ENR_IOPBEN +#endif +#if STM32_NGPIO > 32 + |RCC_APB2ENR_IOPCEN +#endif +#if STM32_NGPIO > 48 + |RCC_APB2ENR_IOPDEN +#endif +#if STM32_NGPIO > 64 + |RCC_APB2ENR_IOPEEN +#endif +#if STM32_NGPIO > 80 + |RCC_APB2ENR_IOPFEN +#endif +#if STM32_NGPIO > 96 + |RCC_APB2ENR_IOPGEN +#endif + ); + +#ifdef CONFIG_STM32_ADC1 + /* ADC 1 interface clock enable */ + + regval |= RCC_APB2ENR_ADC1EN; +#endif + +#ifdef CONFIG_STM32_ADC2 + /* ADC 2 interface clock enable */ + + regval |= RCC_APB2ENR_ADC2EN; +#endif + +#ifdef CONFIG_STM32_TIM1 + /* TIM1 Timer clock enable */ +#ifdef CONFIG_STM32_FORCEPOWER + regval |= RCC_APB2ENR_TIM1EN; +#endif +#endif + +#ifdef CONFIG_STM32_SPI1 + /* SPI 1 clock enable */ + + regval |= RCC_APB2ENR_SPI1EN; +#endif + +#ifdef CONFIG_STM32_TIM8 + /* TIM8 Timer clock enable */ +#ifdef CONFIG_STM32_FORCEPOWER + regval |= RCC_APB2ENR_TIM8EN; +#endif +#endif + +#ifdef CONFIG_STM32_USART1 + /* USART1 clock enable */ + + regval |= RCC_APB2ENR_USART1EN; +#endif + +#ifdef CONFIG_STM32_ADC3 + /*ADC3 interface clock enable */ + + regval |= RCC_APB2ENR_ADC3EN; +#endif + putreg32(regval, STM32_RCC_APB2ENR); +} + +/**************************************************************************** + * Name: stm32_stdclockconfig + * + * Description: + * Called to change to new clock based on settings in board.h + * + * NOTE: This logic would need to be extended if you need to select low- + * power clocking modes! + ****************************************************************************/ + +#ifndef CONFIG_ARCH_BOARD_STM32_CUSTOM_CLOCKCONFIG +static void stm32_stdclockconfig(void) +{ + uint32_t regval; + + /* If the PLL is using the HSE, or the HSE is the system clock */ + +#if (STM32_CFGR_PLLSRC == RCC_CFGR_PLLSRC) || (STM32_SYSCLK_SW == RCC_CFGR_SW_HSE) + + { + volatile int32_t timeout; + + /* Enable External High-Speed Clock (HSE) */ + + regval = getreg32(STM32_RCC_CR); + regval &= ~RCC_CR_HSEBYP; /* Disable HSE clock bypass */ + regval |= RCC_CR_HSEON; /* Enable HSE */ + putreg32(regval, STM32_RCC_CR); + + /* Wait until the HSE is ready (or until a timeout elapsed) */ + + for (timeout = HSERDY_TIMEOUT; timeout > 0; timeout--) + { + /* Check if the HSERDY flag is the set in the CR */ + + if ((getreg32(STM32_RCC_CR) & RCC_CR_HSERDY) != 0) + { + /* If so, then break-out with timeout > 0 */ + + break; + } + } + + if (timeout == 0) + { + /* In the case of a timeout starting the HSE, we really don't have a + * strategy. This is almost always a hardware failure or misconfiguration. + */ + + return; + } + } + + /* If this is a value-line part and we are using the HSE as the PLL */ + +# if defined(CONFIG_STM32_VALUELINE) && (STM32_CFGR_PLLSRC == RCC_CFGR_PLLSRC) + +# if (STM32_CFGR_PLLXTPRE >> 17) != (STM32_CFGR2_PREDIV1 & 1) +# error STM32_CFGR_PLLXTPRE must match the LSB of STM32_CFGR2_PREDIV1 +# endif + + /* Set the HSE prescaler */ + + regval = STM32_CFGR2_PREDIV1; + putreg32(regval, STM32_RCC_CFGR2); + +# endif +#endif + + /* Value-line devices don't implement flash prefetch/waitstates */ + +#ifndef CONFIG_STM32_VALUELINE + + /* Enable FLASH prefetch buffer and 2 wait states */ + + regval = getreg32(STM32_FLASH_ACR); + regval &= ~FLASH_ACR_LATENCY_MASK; + regval |= (FLASH_ACR_LATENCY_2|FLASH_ACR_PRTFBE); + putreg32(regval, STM32_FLASH_ACR); + +#endif + + /* Set the HCLK source/divider */ + + regval = getreg32(STM32_RCC_CFGR); + regval &= ~RCC_CFGR_HPRE_MASK; + regval |= STM32_RCC_CFGR_HPRE; + putreg32(regval, STM32_RCC_CFGR); + + /* Set the PCLK2 divider */ + + regval = getreg32(STM32_RCC_CFGR); + regval &= ~RCC_CFGR_PPRE2_MASK; + regval |= STM32_RCC_CFGR_PPRE2; + putreg32(regval, STM32_RCC_CFGR); + + /* Set the PCLK1 divider */ + + regval = getreg32(STM32_RCC_CFGR); + regval &= ~RCC_CFGR_PPRE1_MASK; + regval |= STM32_RCC_CFGR_PPRE1; + putreg32(regval, STM32_RCC_CFGR); + + /* If we are using the PLL, configure and start it */ + +#if STM32_SYSCLK_SW == RCC_CFGR_SW_PLL + + /* Set the PLL divider and multipler */ + + regval = getreg32(STM32_RCC_CFGR); + regval &= ~(RCC_CFGR_PLLSRC|RCC_CFGR_PLLXTPRE|RCC_CFGR_PLLMUL_MASK); + regval |= (STM32_CFGR_PLLSRC|STM32_CFGR_PLLXTPRE|STM32_CFGR_PLLMUL); + putreg32(regval, STM32_RCC_CFGR); + + /* Enable the PLL */ + + regval = getreg32(STM32_RCC_CR); + regval |= RCC_CR_PLLON; + putreg32(regval, STM32_RCC_CR); + + /* Wait until the PLL is ready */ + + while ((getreg32(STM32_RCC_CR) & RCC_CR_PLLRDY) == 0); + +#endif + + /* Select the system clock source (probably the PLL) */ + + regval = getreg32(STM32_RCC_CFGR); + regval &= ~RCC_CFGR_SW_MASK; + regval |= STM32_SYSCLK_SW; + putreg32(regval, STM32_RCC_CFGR); + + /* Wait until the selected source is used as the system clock source */ + + while ((getreg32(STM32_RCC_CFGR) & RCC_CFGR_SWS_MASK) != STM32_SYSCLK_SWS); +} +#endif + +/**************************************************************************** + * Name: rcc_enableperiphals + ****************************************************************************/ + +static inline void rcc_enableperipherals(void) +{ + rcc_enableahb(); + rcc_enableapb2(); + rcc_enableapb1(); +} + +/**************************************************************************** + * Public Functions + ****************************************************************************/ |