/* Soil Sensor Firmware
 * Sense/Net (RS-485) Bus
 * Sensiplicity Systems
 * 
 *  Copyright 2015
 * 
 *  Department of Botany and Plant Pathology
 *  Center for Genome Research and Biocomputing
 *  Oregon State University
 *  Corvallis, OR 97331
 * 
 * This program is not free software; you can not redistribute it and/or
 * modify it at all.
 * 
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. */
#include <avr/pgmspace.h>

/* This module contains an autonomous set of interrupts that manages
 * the Sense/Net bus. Measurement data should be stored in MeasurementData.
 * Perform writes to MeasurementData inside an ATOMIC_BLOCK(ATOMIC_RESTORESTATE){} to
 * prevent corruption!
 * 
 * This modules uses timer 2. */
struct measurement_data_t {
	uint16_t humidity; /* Ambient relative humidity. 0=0%, 4096=100% */
	int16_t temp_ambient; /* Ambient temperature, in 1/16 (.125) degrees Celsius. */
	int16_t temp_soil_z0; /* Soil temperature of zone 0, in 1/16 (.125) degrees Celsius. */
	int16_t temp_soil_z1; /* Soil temperature of zone 0, in 1/16 (.125) degrees Celsius. */
	int16_t temp_soil_z2; /* Soil temperature of zone 0, in 1/16 (.125) degrees Celsius. */
	int16_t temp_soil_z3; /* Soil temperature of zone 0, in 1/16 (.125) degrees Celsius. */
	uint32_t light; /* Current light level, in nW/cm^2 */
	
	uint8_t volt_idle; /* Idle supply voltage, in 1/32 volt increments. (160 = 5V). */
	uint32_t uptime; /* Number of seconds since this sensor was powered on.
	                  * This field is set internally by this module. */
	uint32_t mtime; /* Uptime value at the time of measurement. */
	
	uint8_t zones; /* Number of zones present on this sensor node. */
	uint16_t moisture_z0; /* Moisture level in zone 0. Calibration TBD. */
	uint16_t moisture_z1; /* Moisture level in zone 1. Calibration TBD. */
	uint16_t moisture_z2; /* Moisture level in zone 2. Calibration TBD. */
	uint16_t moisture_z3; /* Moisture level in zone 3. Calibration TBD. */
};
extern volatile struct measurement_data_t MeasurementData;

/* If !0, the LED should be blinked by the main() function. */
extern volatile uint8_t LEDBlink;

/* Initialize the pins, peripherals, and interrupts for the UART. */
void init_bus(void);

/* Transmit the given buffer over the RS-485 bus. Don't call this function
 * while data is being received. */
void send(uint8_t *s, uint16_t length);