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#include <stdbool.h>
#include <stdlib.h>
#include <math.h>
#include "data_manager.h"
#include "barometer.h"
/* utility functions */
static float pressure_to_metres_asl(float real, float setting)
{
return 44330.f*(1.f-powf(real/setting, 1/5.255));
}
void data_manager_init(struct data_ctx *ctx)
{
ctx->setting = 1013.25;
barometer_init();
data_manager_tick(ctx);
}
void data_manager_tick(struct data_ctx *ctx)
{
/* FIXME alt rate */
/* FIXME calculate on demand? */
ctx->pressure = barometer_read();
/* FIXME we need atomic access to alt setting once user can set it. Check
* if AVR allows multiple/nested ISRs to run concurrently, pretty sure not
*/
ctx->altitude = pressure_to_metres_asl(ctx->pressure, ctx->setting);
}
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