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81 lines
2.3 KiB
C
81 lines
2.3 KiB
C
/*
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* Copyright 2024 Google LLC
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include "drivers/gpio.h"
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#include <stdint.h>
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#define MAX_GPIO (9)
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static uint8_t s_gpio_clock_count[MAX_GPIO];
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void gpio_use(GPIO_TypeDef* GPIOx) {
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uint8_t idx = ((((uint32_t)GPIOx) - AHB1PERIPH_BASE) / 0x0400);
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if((idx < MAX_GPIO) && !(s_gpio_clock_count[idx]++)) {
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SET_BIT(RCC->AHB1ENR, (0x1 << idx));
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}
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}
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void gpio_release(GPIO_TypeDef* GPIOx) {
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uint8_t idx = ((((uint32_t)GPIOx) - AHB1PERIPH_BASE) / 0x0400);
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if((idx < MAX_GPIO) && s_gpio_clock_count[idx] && !(--s_gpio_clock_count[idx])) {
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CLEAR_BIT(RCC->AHB1ENR, (0x1 << idx));
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}
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}
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void gpio_output_init(OutputConfig pin_config, GPIOOType_TypeDef otype,
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GPIOSpeed_TypeDef speed) {
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GPIO_InitTypeDef init = {
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.GPIO_Pin = pin_config.gpio_pin,
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.GPIO_Mode = GPIO_Mode_OUT,
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.GPIO_Speed = speed,
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.GPIO_OType = otype,
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.GPIO_PuPd = GPIO_PuPd_NOPULL
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};
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gpio_use(pin_config.gpio);
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GPIO_Init(pin_config.gpio, &init);
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gpio_release(pin_config.gpio);
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}
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void gpio_output_set(OutputConfig pin_config, bool asserted) {
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if (!pin_config.active_high) {
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asserted = !asserted;
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}
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gpio_use(pin_config.gpio);
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GPIO_WriteBit(pin_config.gpio, pin_config.gpio_pin,
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asserted? Bit_SET : Bit_RESET);
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gpio_release(pin_config.gpio);
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}
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void gpio_af_init(AfConfig af_config, GPIOOType_TypeDef otype,
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GPIOSpeed_TypeDef speed, GPIOPuPd_TypeDef pupd) {
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GPIO_InitTypeDef init = {
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.GPIO_Pin = af_config.gpio_pin,
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.GPIO_Mode = GPIO_Mode_AF,
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.GPIO_Speed = speed,
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.GPIO_OType = otype,
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.GPIO_PuPd = pupd
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};
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gpio_use(af_config.gpio);
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GPIO_Init(af_config.gpio, &init);
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GPIO_PinAFConfig(af_config.gpio, af_config.gpio_pin_source,
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af_config.gpio_af);
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gpio_release(af_config.gpio);
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}
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