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pins: Add support for pull down resistors

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Add initial support for selecting pull down resistors (for
micro-controllers that support it).

Signed-off-by: Kevin O'Connor <kevin@koconnor.net>
This commit is contained in:
Kevin O'Connor
2019-02-27 11:07:51 -05:00
parent b6589406d4
commit dddfb681c7
6 changed files with 40 additions and 20 deletions
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4
src/avr/gpio.c
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@@ -74,7 +74,7 @@ gpio_out_write(struct gpio_out g, uint8_t val)
struct gpio_in
gpio_in_setup(uint8_t pin, int8_t pull_up)
{
if (GPIO2PORT(pin) >= ARRAY_SIZE(digital_regs))
if (GPIO2PORT(pin) >= ARRAY_SIZE(digital_regs) || pull_up < 0)
goto fail;
struct gpio_digital_regs *regs = GPIO2REGS(pin);
if (! regs)
@@ -83,7 +83,7 @@ gpio_in_setup(uint8_t pin, int8_t pull_up)
gpio_in_reset(g, pull_up);
return g;
fail:
shutdown("Not an input pin");
shutdown("Not a valid input pin");
}
void