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avr: Add support for gpio_x_reset() 

Signed-off-by: Kevin O'Connor <kevin@koconnor.net>
This commit is contained in:
Kevin O'Connor 2018-08-19 19:10:36 -04:00
parent 34fe4cce14
commit 1ae67441c3
2 changed files with 26 additions and 12 deletions
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36
src/avr/gpio.c
View File

@ -52,16 +52,22 @@ gpio_out_setup(uint8_t pin, uint8_t val)
struct gpio_digital_regs *regs = GPIO2REGS(pin);
if (! regs)
goto fail;
uint8_t bit = GPIO2BIT(pin);
irqstatus_t flag = irq_save();
regs->out = val ? (regs->out | bit) : (regs->out & ~bit);
regs->mode |= bit;
irq_restore(flag);
return (struct gpio_out){ .regs=regs, .bit=bit };
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, uint8_t val)
{
irqstatus_t flag = irq_save();
g.regs->out = val ? (g.regs->out | g.bit) : (g.regs->out & ~g.bit);
g.regs->mode |= g.bit;
irq_restore(flag);
}
void
gpio_out_toggle_noirq(struct gpio_out g)
{
@ -90,16 +96,22 @@ gpio_in_setup(uint8_t pin, int8_t pull_up)
struct gpio_digital_regs *regs = GPIO2REGS(pin);
if (! regs)
goto fail;
uint8_t bit = GPIO2BIT(pin);
irqstatus_t flag = irq_save();
regs->out = pull_up > 0 ? (regs->out | bit) : (regs->out & ~bit);
regs->mode &= ~bit;
irq_restore(flag);
return (struct gpio_in){ .regs=regs, .bit=bit };
struct gpio_in g = { .regs=regs, .bit=GPIO2BIT(pin) };
gpio_in_reset(g, pull_up);
return g;
fail:
shutdown("Not an input pin");
}
void
gpio_in_reset(struct gpio_in g, int8_t pull_up)
{
irqstatus_t flag = irq_save();
g.regs->out = pull_up > 0 ? (g.regs->out | g.bit) : (g.regs->out & ~g.bit);
g.regs->mode &= ~g.bit;
irq_restore(flag);
}
uint8_t
gpio_in_read(struct gpio_in g)
{

2
src/avr/gpio.h
View File

@ -9,6 +9,7 @@ struct gpio_out {
uint8_t bit : 8;
};
struct gpio_out gpio_out_setup(uint8_t pin, uint8_t val);
void gpio_out_reset(struct gpio_out g, uint8_t val);
void gpio_out_toggle_noirq(struct gpio_out g);
void gpio_out_toggle(struct gpio_out g);
void gpio_out_write(struct gpio_out g, uint8_t val);
@ -18,6 +19,7 @@ struct gpio_in {
uint8_t bit;
};
struct gpio_in gpio_in_setup(uint8_t pin, int8_t pull_up);
void gpio_in_reset(struct gpio_in g, int8_t pull_up);
uint8_t gpio_in_read(struct gpio_in g);
struct gpio_pwm {