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gex-core/units/digital_in/_din_api.c

72 lines
1.8 KiB

7 years ago
//
// Created by MightyPork on 2018/02/03.
//
#include "platform.h"
#include "unit_base.h"
#include "unit_din.h"
#define DIN_INTERNAL
#include "_din_internal.h"
/** Read request */
error_t UU_DIn_Read(Unit *unit, uint16_t *packed)
7 years ago
{
CHECK_TYPE(unit, &UNIT_DIN);
struct priv *priv = unit->data;
*packed = pinmask_pack((uint16_t) priv->port->IDR, priv->pins);
return E_SUCCESS;
}
/** Arm pins */
error_t UU_DIn_Arm(Unit *unit, uint16_t arm_single_packed, uint16_t arm_auto_packed)
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{
CHECK_TYPE(unit, &UNIT_DIN);
struct priv *priv = unit->data;
uint16_t arm_single = pinmask_spread(arm_single_packed, priv->pins);
uint16_t arm_auto = pinmask_spread(arm_auto_packed, priv->pins);
// abort if user tries to arm pin that doesn't have a trigger configured
if (0 != ((arm_single | arm_auto) & ~(priv->trig_fall | priv->trig_rise))) {
return E_BAD_VALUE;
}
// arm and reset hold-offs
// we use critical section to avoid irq between the two steps
vPortEnterCritical();
{
priv->arm_auto |= arm_single;
priv->arm_single |= arm_auto;
const uint16_t combined = arm_single | arm_auto;
for (int i = 0; i < 16; i++) {
if (combined & (1 << i)) {
priv->holdoff_countdowns[i] = 0;
}
}
}
vPortExitCritical();
return E_SUCCESS;
}
/** DisArm pins */
error_t UU_DIn_DisArm(Unit *unit, uint16_t disarm_packed)
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{
CHECK_TYPE(unit, &UNIT_DIN);
struct priv *priv = unit->data;
uint16_t disarm = pinmask_spread(disarm_packed, priv->pins);
// abort if user tries to disarm pin that doesn't have a trigger configured
if (0 != ((disarm) & ~(priv->trig_fall | priv->trig_rise))) {
return E_BAD_VALUE;
}
priv->arm_auto &= ~disarm;
priv->arm_single &= ~disarm;
return E_SUCCESS;
}