| /* |
| * Copyright (c) Linaro Limited. |
| * |
| * SPDX-License-Identifier: Apache-2.0 |
| */ |
| |
| /** |
| * @brief |
| * |
| * Based on reference manual: |
| * RM0368 Reference manual STM32F401xB/C and STM32F401xD/E |
| * advanced ARM ® -based 32-bit MCUs |
| * |
| * Chapter 8: General-purpose I/Os (GPIOs) |
| */ |
| |
| #include <errno.h> |
| |
| #include <device.h> |
| #include "soc.h" |
| #include "soc_registers.h" |
| #include <gpio.h> |
| #include <gpio/gpio_stm32.h> |
| |
| |
| int stm32_gpio_flags_to_conf(int flags, int *pincfg) |
| { |
| int direction = flags & GPIO_DIR_MASK; |
| int pud = flags & GPIO_PUD_MASK; |
| |
| if (!pincfg) { |
| return -EINVAL; |
| } |
| |
| if (direction == GPIO_DIR_OUT) { |
| *pincfg = STM32_MODER_OUTPUT_MODE; |
| } else { |
| /* pull-{up,down} maybe? */ |
| *pincfg = STM32_MODER_INPUT_MODE; |
| |
| if (pud == GPIO_PUD_PULL_UP) { |
| *pincfg = *pincfg | STM32_PUPDR_PULL_UP; |
| } else if (pud == GPIO_PUD_PULL_DOWN) { |
| *pincfg = *pincfg | STM32_PUPDR_PULL_DOWN; |
| } else { |
| /* floating */ |
| *pincfg = *pincfg | STM32_PUPDR_NO_PULL; |
| } |
| } |
| |
| return 0; |
| } |
| |
| int stm32_gpio_configure(u32_t *base_addr, int pin, int conf, int altf) |
| { |
| volatile struct stm32f4x_gpio *gpio = |
| (struct stm32f4x_gpio *)(base_addr); |
| unsigned int mode, otype, ospeed, pupd; |
| unsigned int pin_shift = pin << 1; |
| unsigned int afr_bank = pin / 8; |
| unsigned int afr_shift = (pin % 8) << 2; |
| u32_t scratch; |
| |
| mode = (conf >> STM32_MODER_SHIFT) & STM32_MODER_MASK; |
| otype = (conf >> STM32_OTYPER_SHIFT) & STM32_OTYPER_MASK; |
| ospeed = (conf >> STM32_OSPEEDR_SHIFT) & STM32_OSPEEDR_MASK; |
| pupd = (conf >> STM32_PUPDR_SHIFT) & STM32_PUPDR_MASK; |
| |
| scratch = gpio->mode & ~(STM32_MODER_MASK << pin_shift); |
| gpio->mode = scratch | (mode << pin_shift); |
| |
| scratch = gpio->ospeed & ~(STM32_OSPEEDR_MASK << pin_shift); |
| gpio->ospeed = scratch | (ospeed << pin_shift); |
| |
| scratch = gpio->otype & ~(STM32_OTYPER_MASK << pin); |
| gpio->otype = scratch | (otype << pin); |
| |
| scratch = gpio->pupdr & ~(STM32_PUPDR_MASK << pin_shift); |
| gpio->pupdr = scratch | (pupd << pin_shift); |
| |
| scratch = gpio->afr[afr_bank] & ~(STM32_AFR_MASK << afr_shift); |
| gpio->afr[afr_bank] = scratch | (altf << afr_shift); |
| |
| return 0; |
| } |
| |
| int stm32_gpio_set(u32_t *base, int pin, int value) |
| { |
| struct stm32f4x_gpio *gpio = (struct stm32f4x_gpio *)base; |
| |
| if (value) { |
| /* atomic set */ |
| gpio->bsr = (1 << (pin & 0x0f)); |
| } else { |
| /* atomic reset */ |
| gpio->bsr = (1 << ((pin & 0x0f) + 0x10)); |
| } |
| |
| return 0; |
| } |
| |
| int stm32_gpio_get(u32_t *base, int pin) |
| { |
| struct stm32f4x_gpio *gpio = (struct stm32f4x_gpio *)base; |
| |
| return (gpio->idr >> pin) & 0x1; |
| } |
| |
| int stm32_gpio_enable_int(int port, int pin) |
| { |
| volatile struct stm32f4x_syscfg *syscfg = |
| (struct stm32f4x_syscfg *)SYSCFG_BASE; |
| volatile union syscfg_exticr *exticr; |
| struct device *clk = device_get_binding(STM32_CLOCK_CONTROL_NAME); |
| struct stm32_pclken pclken = { |
| .bus = STM32_CLOCK_BUS_APB2, |
| .enr = LL_APB2_GRP1_PERIPH_SYSCFG |
| }; |
| int shift = 0; |
| |
| /* Enable SYSCFG clock */ |
| clock_control_on(clk, (clock_control_subsys_t *) &pclken); |
| |
| if (pin <= 3) { |
| exticr = &syscfg->exticr1; |
| } else if (pin <= 7) { |
| exticr = &syscfg->exticr2; |
| } else if (pin <= 11) { |
| exticr = &syscfg->exticr3; |
| } else if (pin <= 15) { |
| exticr = &syscfg->exticr4; |
| } else { |
| return -EINVAL; |
| } |
| |
| shift = 4 * (pin % 4); |
| |
| exticr->val &= ~(0xf << shift); |
| exticr->val |= port << shift; |
| |
| return 0; |
| } |