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// GPIO functions on stm32f4
//
// Copyright (C) 2019 Kevin O'Connor <kevin@koconnor.net>
//
// This file may be distributed under the terms of the GNU GPLv3 license.
#include <string.h> // ffs
#include "board/irq.h" // irq_save
#include "command.h" // DECL_ENUMERATION_RANGE
#include "gpio.h" // gpio_out_setup
#include "internal.h" // gpio_peripheral
#include "sched.h" // sched_shutdown
DECL_ENUMERATION_RANGE("pin", "PA0", GPIO('A', 0), 32);
DECL_ENUMERATION_RANGE("pin", "PB0", GPIO('B', 0), 32);
DECL_ENUMERATION_RANGE("pin", "PC0", GPIO('C', 0), 32);
DECL_ENUMERATION_RANGE("pin", "PD0", GPIO('D', 0), 32);
DECL_ENUMERATION_RANGE("pin", "PE0", GPIO('E', 0), 32);
DECL_ENUMERATION_RANGE("pin", "PF0", GPIO('F', 0), 32);
DECL_ENUMERATION_RANGE("pin", "PG0", GPIO('G', 0), 32);
DECL_ENUMERATION_RANGE("pin", "PH0", GPIO('H', 0), 32);
#ifdef GPIOI
DECL_ENUMERATION_RANGE("pin", "PI0", GPIO('I', 0), 32);
#endif
GPIO_TypeDef * const digital_regs[] = {
GPIOA, GPIOB, GPIOC, GPIOD, GPIOE, GPIOF, GPIOG, GPIOH,
#ifdef GPIOI
GPIOI,
#endif
};
// Convert a register and bit location back to an integer pin identifier
static int
regs_to_pin(GPIO_TypeDef *regs, uint32_t bit)
{
int i;
for (i=0; i<ARRAY_SIZE(digital_regs); i++)
if (digital_regs[i] == regs)
return GPIO('A' + i, ffs(bit)-1);
return 0;
}
struct gpio_out
gpio_out_setup(uint32_t pin, uint32_t val)
{
if (GPIO2PORT(pin) >= ARRAY_SIZE(digital_regs))
goto fail;
GPIO_TypeDef *regs = digital_regs[GPIO2PORT(pin)];
struct gpio_out g = { .regs=regs, .bit=GPIO2BIT(pin) };
gpio_out_reset(g, val);
return g;
fail:
shutdown("Not an output pin");
}
void
gpio_out_reset(struct gpio_out g, uint32_t val)
{
GPIO_TypeDef *regs = g.regs;
int pin = regs_to_pin(regs, g.bit);
irqstatus_t flag = irq_save();
if (val)
regs->BSRR = g.bit;
else
regs->BSRR = g.bit << 16;
gpio_peripheral(pin, GPIO_OUTPUT, 0);
irq_restore(flag);
}
void
gpio_out_toggle_noirq(struct gpio_out g)
{
GPIO_TypeDef *regs = g.regs;
regs->ODR ^= g.bit;
}
void
gpio_out_toggle(struct gpio_out g)
{
irqstatus_t flag = irq_save();
gpio_out_toggle_noirq(g);
irq_restore(flag);
}
void
gpio_out_write(struct gpio_out g, uint32_t val)
{
GPIO_TypeDef *regs = g.regs;
if (val)
regs->BSRR = g.bit;
else
regs->BSRR = g.bit << 16;
}
struct gpio_in
gpio_in_setup(uint32_t pin, int32_t pull_up)
{
if (GPIO2PORT(pin) >= ARRAY_SIZE(digital_regs))
goto fail;
GPIO_TypeDef *regs = digital_regs[GPIO2PORT(pin)];
struct gpio_in g = { .regs=regs, .bit=GPIO2BIT(pin) };
gpio_in_reset(g, pull_up);
return g;
fail:
shutdown("Not a valid input pin");
}
void
gpio_in_reset(struct gpio_in g, int32_t pull_up)
{
GPIO_TypeDef *regs = g.regs;
int pin = regs_to_pin(regs, g.bit);
irqstatus_t flag = irq_save();
gpio_peripheral(pin, GPIO_INPUT, pull_up);
irq_restore(flag);
}
uint8_t
gpio_in_read(struct gpio_in g)
{
GPIO_TypeDef *regs = g.regs;
return !!(regs->IDR & g.bit);
}
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