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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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39
src/atsam/gpio.c
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@@ -28,6 +28,28 @@ static Pio * const digital_regs[] = {
* Pin multiplexing
****************************************************************/
static void
set_pull_up(Pio *regs, uint32_t bit, int32_t pull_up)
{
#if CONFIG_MACH_SAM3X
if (pull_up > 0)
regs->PIO_PUER = bit;
else
regs->PIO_PUDR = bit;
#else
if (pull_up > 0) {
regs->PIO_PPDDR = bit;
regs->PIO_PUER = bit;
} else if (pull_up < 0) {
regs->PIO_PUDR = bit;
regs->PIO_PPDER = bit;
} else {
regs->PIO_PUDR = bit;
regs->PIO_PPDDR = bit;
}
#endif
}
void
gpio_peripheral(uint32_t gpio, char ptype, int32_t pull_up)
{
@@ -40,11 +62,7 @@ gpio_peripheral(uint32_t gpio, char ptype, int32_t pull_up)
regs->PIO_ABCDSR[0] = (regs->PIO_ABCDSR[0] & ~bit) | (pt & 0x01 ? bit : 0);
regs->PIO_ABCDSR[1] = (regs->PIO_ABCDSR[1] & ~bit) | (pt & 0x02 ? bit : 0);
#endif
if (pull_up > 0)
regs->PIO_PUER = bit;
else
regs->PIO_PUDR = bit;
set_pull_up(regs, bit, pull_up);
regs->PIO_PDR = bit;
}
@@ -78,7 +96,7 @@ gpio_out_reset(struct gpio_out g, uint8_t val)
regs->PIO_OER = g.bit;
regs->PIO_OWER = g.bit;
regs->PIO_PER = g.bit;
regs->PIO_PUDR = g.bit;
set_pull_up(regs, g.bit, 0);
irq_restore(flag);
}
@@ -113,13 +131,15 @@ gpio_in_setup(uint8_t pin, int8_t pull_up)
{
if (GPIO2PORT(pin) >= ARRAY_SIZE(digital_regs))
goto fail;
if (CONFIG_MACH_SAM3X && pull_up < 0)
goto fail;
uint32_t port = GPIO2PORT(pin);
enable_pclock(ID_PIOA + port);
struct gpio_in g = { .regs=digital_regs[port], .bit=GPIO2BIT(pin) };
gpio_in_reset(g, pull_up);
return g;
fail:
shutdown("Not an input pin");
shutdown("Not a valid input pin");
}
void
@@ -127,10 +147,7 @@ gpio_in_reset(struct gpio_in g, int8_t pull_up)
{
Pio *regs = g.regs;
irqstatus_t flag = irq_save();
if (pull_up)
regs->PIO_PUER = g.bit;
else
regs->PIO_PUDR = g.bit;
set_pull_up(regs, g.bit, pull_up);
regs->PIO_ODR = g.bit;
regs->PIO_PER = g.bit;
irq_restore(flag);