369 lines
10 KiB
C
369 lines
10 KiB
C
/*
|
|
* clk_gpio_init-stm32.c - Clock and GPIO initialization for STM32.
|
|
*
|
|
* Copyright (C) 2015 Flying Stone Technology
|
|
* Author: NIIBE Yutaka <gniibe@fsij.org>
|
|
*
|
|
* This file is a part of Chopstx, a thread library for embedded.
|
|
*
|
|
* Chopstx is free software: you can redistribute it and/or modify it
|
|
* under the terms of the GNU General Public License as published by
|
|
* the Free Software Foundation, either version 3 of the License, or
|
|
* (at your option) any later version.
|
|
*
|
|
* Chopstx 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
|
|
* General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU General Public License
|
|
* along with this program. If not, see <http://www.gnu.org/licenses/>.
|
|
*
|
|
* As additional permission under GNU GPL version 3 section 7, you may
|
|
* distribute non-source form of the Program without the copy of the
|
|
* GNU GPL normally required by section 4, provided you inform the
|
|
* receipents of GNU GPL by a written offer.
|
|
*
|
|
*/
|
|
|
|
#define STM32_SW_HSI (0 << 0)
|
|
#define STM32_SW_PLL (2 << 0)
|
|
#define STM32_PLLSRC_HSI (0 << 16)
|
|
#define STM32_PLLSRC_HSE (1 << 16)
|
|
|
|
#define STM32_PLLXTPRE_DIV1 (0 << 17)
|
|
#define STM32_PLLXTPRE_DIV2 (1 << 17)
|
|
|
|
#define STM32_HPRE_DIV1 (0 << 4)
|
|
|
|
#define STM32_PPRE1_DIV1 (0 << 8)
|
|
#define STM32_PPRE1_DIV2 (4 << 8)
|
|
|
|
#define STM32_PPRE2_DIV1 (0 << 11)
|
|
#define STM32_PPRE2_DIV2 (4 << 11)
|
|
|
|
#define STM32_ADCPRE_DIV4 (1 << 14)
|
|
#define STM32_ADCPRE_DIV6 (2 << 14)
|
|
|
|
#define STM32_USBPRE_DIV1P5 (0 << 22)
|
|
|
|
#define STM32_MCO_NOCLOCK (0 << 24)
|
|
|
|
#if defined(MCU_STM32F0)
|
|
#define STM32_PPRE1 STM32_PPRE1_DIV1
|
|
#define STM32_PLLSRC STM32_PLLSRC_HSI
|
|
#define STM32_FLASHBITS 0x00000011
|
|
#define STM32_PLLCLKIN (STM32_HSICLK / 2)
|
|
#else
|
|
#define STM32_PPRE1 STM32_PPRE1_DIV2
|
|
#define STM32_PLLSRC STM32_PLLSRC_HSE
|
|
#define STM32_FLASHBITS 0x00000012
|
|
#define STM32_PLLCLKIN (STM32_HSECLK / 1)
|
|
#endif
|
|
|
|
#define STM32_SW STM32_SW_PLL
|
|
#define STM32_HPRE STM32_HPRE_DIV1
|
|
#define STM32_PPRE2 STM32_PPRE2_DIV1
|
|
#define STM32_ADCPRE STM32_ADCPRE_DIV6
|
|
#define STM32_MCOSEL STM32_MCO_NOCLOCK
|
|
#define STM32_USBPRE STM32_USBPRE_DIV1P5
|
|
|
|
#define STM32_PLLMUL ((STM32_PLLMUL_VALUE - 2) << 18)
|
|
#define STM32_PLLCLKOUT (STM32_PLLCLKIN * STM32_PLLMUL_VALUE)
|
|
#define STM32_SYSCLK STM32_PLLCLKOUT
|
|
#define STM32_HCLK (STM32_SYSCLK / 1)
|
|
|
|
|
|
#define PERIPH_BASE 0x40000000
|
|
#define APBPERIPH_BASE PERIPH_BASE
|
|
#define APB2PERIPH_BASE (PERIPH_BASE + 0x10000)
|
|
#define AHBPERIPH_BASE (PERIPH_BASE + 0x20000)
|
|
#define AHB2PERIPH_BASE (PERIPH_BASE + 0x08000000)
|
|
|
|
struct RCC {
|
|
volatile uint32_t CR;
|
|
volatile uint32_t CFGR;
|
|
volatile uint32_t CIR;
|
|
volatile uint32_t APB2RSTR;
|
|
volatile uint32_t APB1RSTR;
|
|
volatile uint32_t AHBENR;
|
|
volatile uint32_t APB2ENR;
|
|
volatile uint32_t APB1ENR;
|
|
volatile uint32_t BDCR;
|
|
volatile uint32_t CSR;
|
|
#if defined(MCU_STM32F0)
|
|
volatile uint32_t AHBRSTR;
|
|
volatile uint32_t CFGR2;
|
|
volatile uint32_t CFGR3;
|
|
volatile uint32_t CR2;
|
|
#endif
|
|
};
|
|
|
|
#define RCC_BASE (AHBPERIPH_BASE + 0x1000)
|
|
static struct RCC *const RCC = ((struct RCC *const)RCC_BASE);
|
|
|
|
#define RCC_APB1ENR_USBEN 0x00800000
|
|
#define RCC_APB1RSTR_USBRST 0x00800000
|
|
|
|
#define RCC_CR_HSION 0x00000001
|
|
#define RCC_CR_HSIRDY 0x00000002
|
|
#define RCC_CR_HSITRIM 0x000000F8
|
|
#define RCC_CR_HSEON 0x00010000
|
|
#define RCC_CR_HSERDY 0x00020000
|
|
#define RCC_CR_PLLON 0x01000000
|
|
#define RCC_CR_PLLRDY 0x02000000
|
|
|
|
#define RCC_CFGR_SWS 0x0000000C
|
|
#define RCC_CFGR_SWS_HSI 0x00000000
|
|
|
|
#define RCC_AHBENR_CRCEN 0x0040
|
|
|
|
#if defined(MCU_STM32F0)
|
|
#define RCC_AHBRSTR_IOPARST 0x00020000
|
|
#define RCC_AHBRSTR_IOPBRST 0x00040000
|
|
#define RCC_AHBRSTR_IOPCRST 0x00080000
|
|
#define RCC_AHBRSTR_IOPDRST 0x00100000
|
|
#define RCC_AHBRSTR_IOPFRST 0x00400000
|
|
|
|
#define RCC_AHBENR_IOPAEN 0x00020000
|
|
#define RCC_AHBENR_IOPBEN 0x00040000
|
|
#define RCC_AHBENR_IOPCEN 0x00080000
|
|
#define RCC_AHBENR_IOPDEN 0x00100000
|
|
#define RCC_AHBENR_IOPFEN 0x00400000
|
|
|
|
#define RCC_APB2RSTR_SYSCFGRST 0x00000001
|
|
#define RCC_APB2ENR_SYSCFGEN 0x00000001
|
|
#else
|
|
#define RCC_APB2RSTR_AFIORST 0x00000001
|
|
#define RCC_APB2RSTR_IOPARST 0x00000004
|
|
#define RCC_APB2RSTR_IOPBRST 0x00000008
|
|
#define RCC_APB2RSTR_IOPCRST 0x00000010
|
|
#define RCC_APB2RSTR_IOPDRST 0x00000020
|
|
#define RCC_APB2RSTR_IOPERST 0x00000040
|
|
#define RCC_APB2RSTR_IOPFRST 0x00000080
|
|
#define RCC_APB2RSTR_IOPGRST 0x00000100
|
|
|
|
#define RCC_APB2ENR_AFIOEN 0x00000001
|
|
#define RCC_APB2ENR_IOPAEN 0x00000004
|
|
#define RCC_APB2ENR_IOPBEN 0x00000008
|
|
#define RCC_APB2ENR_IOPCEN 0x00000010
|
|
#define RCC_APB2ENR_IOPDEN 0x00000020
|
|
#define RCC_APB2ENR_IOPEEN 0x00000040
|
|
#define RCC_APB2ENR_IOPFEN 0x00000080
|
|
#define RCC_APB2ENR_IOPGEN 0x00000100
|
|
#endif
|
|
|
|
#if defined(MCU_STM32F0)
|
|
struct SYSCFG {
|
|
volatile uint32_t CFGR1;
|
|
uint32_t dummy0;
|
|
volatile uint32_t EXTICR[4];
|
|
volatile uint32_t CFGR2;
|
|
};
|
|
#define SYSCFG_CFGR1_MEM_MODE 0x03
|
|
|
|
#define SYSCFG_BASE (APBPERIPH_BASE + 0x00010000)
|
|
static struct SYSCFG *const SYSCFG = ((struct SYSCFG *const) SYSCFG_BASE);
|
|
#endif
|
|
|
|
struct FLASH {
|
|
volatile uint32_t ACR;
|
|
volatile uint32_t KEYR;
|
|
volatile uint32_t OPTKEYR;
|
|
volatile uint32_t SR;
|
|
volatile uint32_t CR;
|
|
volatile uint32_t AR;
|
|
volatile uint32_t RESERVED;
|
|
volatile uint32_t OBR;
|
|
volatile uint32_t WRPR;
|
|
};
|
|
|
|
#define FLASH_R_BASE (AHBPERIPH_BASE + 0x2000)
|
|
static struct FLASH *const FLASH = ((struct FLASH *const) FLASH_R_BASE);
|
|
|
|
static void __attribute__((used))
|
|
clock_init (void)
|
|
{
|
|
/* HSI setup */
|
|
RCC->CR |= RCC_CR_HSION;
|
|
while (!(RCC->CR & RCC_CR_HSIRDY))
|
|
;
|
|
/* Reset HSEON, HSEBYP, CSSON, and PLLON, not touching RCC_CR_HSITRIM */
|
|
RCC->CR &= (RCC_CR_HSITRIM | RCC_CR_HSION);
|
|
RCC->CFGR = 0;
|
|
while ((RCC->CFGR & RCC_CFGR_SWS) != RCC_CFGR_SWS_HSI)
|
|
;
|
|
|
|
#if !defined(MCU_STM32F0)
|
|
/* HSE setup */
|
|
RCC->CR |= RCC_CR_HSEON;
|
|
while (!(RCC->CR & RCC_CR_HSERDY))
|
|
;
|
|
#endif
|
|
|
|
/* PLL setup */
|
|
RCC->CFGR |= STM32_PLLMUL | STM32_PLLXTPRE | STM32_PLLSRC;
|
|
RCC->CR |= RCC_CR_PLLON;
|
|
while (!(RCC->CR & RCC_CR_PLLRDY))
|
|
;
|
|
|
|
/* Clock settings */
|
|
RCC->CFGR = STM32_MCOSEL | STM32_USBPRE | STM32_PLLMUL | STM32_PLLXTPRE
|
|
| STM32_PLLSRC | STM32_ADCPRE | STM32_PPRE2 | STM32_PPRE1 | STM32_HPRE;
|
|
|
|
/*
|
|
* We don't touch RCC->CR2, RCC->CFGR2, RCC->CFGR3, and RCC->CIR.
|
|
*/
|
|
|
|
/* Flash setup */
|
|
FLASH->ACR = STM32_FLASHBITS;
|
|
|
|
/* CRC */
|
|
RCC->AHBENR |= RCC_AHBENR_CRCEN;
|
|
|
|
/* Switching on the configured clock source. */
|
|
RCC->CFGR |= STM32_SW;
|
|
while ((RCC->CFGR & RCC_CFGR_SWS) != (STM32_SW << 2))
|
|
;
|
|
|
|
#if defined(MCU_STM32F0)
|
|
RCC->APB2ENR |= RCC_APB2ENR_SYSCFGEN;
|
|
RCC->APB2RSTR = RCC_APB2RSTR_SYSCFGRST;
|
|
RCC->APB2RSTR = 0;
|
|
|
|
# if defined(REQUIRE_CLOCK_GPIO_SETTING_IN_SYS)
|
|
/* Use vectors on RAM */
|
|
SYSCFG->CFGR1 = (SYSCFG->CFGR1 & ~SYSCFG_CFGR1_MEM_MODE) | 3;
|
|
# endif
|
|
#endif
|
|
}
|
|
|
|
|
|
#if defined(MCU_STM32F0)
|
|
struct GPIO {
|
|
volatile uint32_t MODER;
|
|
volatile uint16_t OTYPER;
|
|
uint16_t dummy0;
|
|
volatile uint32_t OSPEEDR;
|
|
volatile uint32_t PUPDR;
|
|
volatile uint16_t IDR;
|
|
uint16_t dummy1;
|
|
volatile uint16_t ODR;
|
|
uint16_t dummy2;
|
|
volatile uint16_t BSRR;
|
|
uint16_t dummy3;
|
|
volatile uint32_t LCKR;
|
|
volatile uint32_t AFR[2];
|
|
volatile uint16_t BRR;
|
|
uint16_t dummy4;
|
|
};
|
|
|
|
#define GPIOA_BASE (AHB2PERIPH_BASE + 0x0000)
|
|
#define GPIOA ((struct GPIO *) GPIOA_BASE)
|
|
#define GPIOB_BASE (AHB2PERIPH_BASE + 0x0400)
|
|
#define GPIOB ((struct GPIO *) GPIOB_BASE)
|
|
#define GPIOC_BASE (AHB2PERIPH_BASE + 0x0800)
|
|
#define GPIOC ((struct GPIO *) GPIOC_BASE)
|
|
#define GPIOD_BASE (AHB2PERIPH_BASE + 0x0C00)
|
|
#define GPIOD ((struct GPIO *) GPIOD_BASE)
|
|
#define GPIOF_BASE (AHB2PERIPH_BASE + 0x1400)
|
|
#define GPIOF ((struct GPIO *) GPIOF_BASE)
|
|
#else
|
|
struct AFIO
|
|
{
|
|
volatile uint32_t EVCR;
|
|
volatile uint32_t MAPR;
|
|
volatile uint32_t EXTICR[4];
|
|
uint32_t RESERVED0;
|
|
volatile uint32_t MAPR2;
|
|
};
|
|
|
|
#define AFIO_BASE 0x40010000
|
|
static struct AFIO *const AFIO = (struct AFIO *const)AFIO_BASE;
|
|
|
|
#define AFIO_MAPR_TIM3_REMAP_PARTIALREMAP 0x00000800
|
|
#define AFIO_MAPR_SWJ_CFG_DISABLE 0x04000000
|
|
#define AFIO_MAPR_SWJ_CFG_JTAGDISABLE 0x02000000
|
|
|
|
|
|
struct GPIO {
|
|
volatile uint32_t CRL;
|
|
volatile uint32_t CRH;
|
|
volatile uint32_t IDR;
|
|
volatile uint32_t ODR;
|
|
volatile uint32_t BSRR;
|
|
volatile uint32_t BRR;
|
|
volatile uint32_t LCKR;
|
|
};
|
|
|
|
#define GPIOA_BASE (APB2PERIPH_BASE + 0x0800)
|
|
#define GPIOA ((struct GPIO *) GPIOA_BASE)
|
|
#define GPIOB_BASE (APB2PERIPH_BASE + 0x0C00)
|
|
#define GPIOB ((struct GPIO *) GPIOB_BASE)
|
|
#define GPIOC_BASE (APB2PERIPH_BASE + 0x1000)
|
|
#define GPIOC ((struct GPIO *) GPIOC_BASE)
|
|
#define GPIOD_BASE (APB2PERIPH_BASE + 0x1400)
|
|
#define GPIOD ((struct GPIO *) GPIOD_BASE)
|
|
#define GPIOE_BASE (APB2PERIPH_BASE + 0x1800)
|
|
#define GPIOE ((struct GPIO *) GPIOE_BASE)
|
|
#endif
|
|
|
|
static struct GPIO *const GPIO_LED = ((struct GPIO *const) GPIO_LED_BASE);
|
|
#ifdef GPIO_USB_BASE
|
|
static struct GPIO *const GPIO_USB = ((struct GPIO *const) GPIO_USB_BASE);
|
|
#endif
|
|
#ifdef GPIO_OTHER_BASE
|
|
static struct GPIO *const GPIO_OTHER = ((struct GPIO *const) GPIO_OTHER_BASE);
|
|
#endif
|
|
|
|
static void __attribute__((used))
|
|
gpio_init (void)
|
|
{
|
|
/* Enable GPIO clock. */
|
|
#if defined(MCU_STM32F0)
|
|
RCC->AHBENR |= RCC_ENR_IOP_EN;
|
|
RCC->AHBRSTR = RCC_RSTR_IOP_RST;
|
|
RCC->AHBRSTR = 0;
|
|
#else
|
|
RCC->APB2ENR |= RCC_ENR_IOP_EN;
|
|
RCC->APB2RSTR = RCC_RSTR_IOP_RST;
|
|
RCC->APB2RSTR = 0;
|
|
#endif
|
|
|
|
#if defined(MCU_STM32F0)
|
|
GPIO_LED->OSPEEDR = VAL_GPIO_LED_OSPEEDR;
|
|
GPIO_LED->OTYPER = VAL_GPIO_LED_OTYPER;
|
|
GPIO_LED->MODER = VAL_GPIO_LED_MODER;
|
|
GPIO_LED->PUPDR = VAL_GPIO_LED_PUPDR;
|
|
|
|
#ifdef GPIO_OTHER_BASE
|
|
GPIO_OTHER->OSPEEDR = VAL_GPIO_OTHER_OSPEEDR;
|
|
GPIO_OTHER->OTYPER = VAL_GPIO_OTHER_OTYPER;
|
|
GPIO_OTHER->MODER = VAL_GPIO_OTHER_MODER;
|
|
GPIO_OTHER->PUPDR = VAL_GPIO_OTHER_PUPDR;
|
|
#endif
|
|
#else
|
|
#ifdef AFIO_MAPR_SOMETHING
|
|
AFIO->MAPR |= AFIO_MAPR_SOMETHING;
|
|
#endif
|
|
|
|
/* LED is mandatory. If it's on an independent port, we configure it. */
|
|
GPIO_LED->ODR = VAL_GPIO_LED_ODR;
|
|
GPIO_LED->CRH = VAL_GPIO_LED_CRH;
|
|
GPIO_LED->CRL = VAL_GPIO_LED_CRL;
|
|
|
|
/* If there is USB enabler pin and it's independent, we configure it. */
|
|
#if defined(GPIO_USB_BASE) && GPIO_USB_BASE != GPIO_LED_BASE
|
|
GPIO_USB->ODR = VAL_GPIO_USB_ODR;
|
|
GPIO_USB->CRH = VAL_GPIO_USB_CRH;
|
|
GPIO_USB->CRL = VAL_GPIO_USB_CRL;
|
|
#endif
|
|
|
|
#ifdef GPIO_OTHER_BASE
|
|
GPIO_OTHER->ODR = VAL_GPIO_OTHER_ODR;
|
|
GPIO_OTHER->CRH = VAL_GPIO_OTHER_CRH;
|
|
GPIO_OTHER->CRL = VAL_GPIO_OTHER_CRL;
|
|
#endif
|
|
#endif
|
|
}
|