87 lines
2.3 KiB
C
87 lines
2.3 KiB
C
/* Copyright 2018 Canaan Inc.
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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 "gpio.h"
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#include "common.h"
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#include "fpioa.h"
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#include "sysctl.h"
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#define GPIO_MAX_PINNO 8
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volatile gpio_t* const gpio = (volatile gpio_t*)GPIO_BASE_ADDR;
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int gpio_init(void)
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{
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sysctl_clock_enable(SYSCTL_CLOCK_GPIO);
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return 0;
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}
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void gpio_pin_init(size_t pin_num, size_t gpio_pin)
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{
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configASSERT(gpio_pin < GPIO_MAX_PINNO);
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fpioa_set_function(pin_num, FUNC_GPIO0 + gpio_pin);
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}
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void gpio_set_drive_mode(size_t pin, gpio_drive_mode mode)
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{
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configASSERT(pin < GPIO_MAX_PINNO);
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int io_number = fpioa_get_io_by_func(FUNC_GPIO0 + pin);
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configASSERT(io_number > 0);
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enum fpioa_pull_e pull;
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uint32_t dir;
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switch (mode)
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{
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case GPIO_DM_Input:
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pull = FPIOA_PULL_NONE;
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dir = 0;
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break;
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case GPIO_DM_InputPullDown:
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pull = FPIOA_PULL_DOWN;
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dir = 0;
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break;
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case GPIO_DM_InputPullUp:
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pull = FPIOA_PULL_UP;
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dir = 0;
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break;
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case GPIO_DM_Output:
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pull = FPIOA_PULL_DOWN;
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dir = 1;
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break;
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default:
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configASSERT(!"GPIO drive mode is not supported.") break;
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}
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fpioa_set_io_pull(io_number, pull);
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set_gpio_bit(gpio->direction.u32, pin, dir);
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}
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gpio_pin_value gpio_get_pin_value(size_t pin)
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{
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configASSERT(pin < GPIO_MAX_PINNO);
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uint32_t dir = get_gpio_bit(gpio->direction.u32, pin);
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volatile uint32_t* reg = dir ? gpio->data_output.u32 : gpio->data_input.u32;
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return get_gpio_bit(reg, pin);
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}
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void gpio_set_pin_value(size_t pin, gpio_pin_value value)
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{
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configASSERT(pin < GPIO_MAX_PINNO);
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uint32_t dir = get_gpio_bit(gpio->direction.u32, pin);
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volatile uint32_t* reg = dir ? gpio->data_output.u32 : gpio->data_input.u32;
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configASSERT(dir == 1);
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set_gpio_bit(reg, pin, value);
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}
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