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/**
* \file
*
* \brief Metering Application Emulator for all node types
*
* Copyright (c) 2014-2015 Atmel Corporation. All rights reserved.
*
* \asf_license_start
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
*
* 3. The name of Atmel may not be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* 4. This software may only be redistributed and used in connection with an
* Atmel microcontroller product.
*
* THIS SOFTWARE IS PROVIDED BY ATMEL "AS IS" AND ANY EXPRESS OR IMPLIED
* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT ARE
* EXPRESSLY AND SPECIFICALLY DISCLAIMED. IN NO EVENT SHALL ATMEL BE LIABLE FOR
* ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*
* \asf_license_stop
*
*/
/* System includes */
#include <stdio.h>
#include <string.h>
/* CS includes */
#include "app_emu_common.h"
#include "compiler.h"
#define MULTIPLIER 0x015a4e35L
#define INCREMENT 1
static long l_app_emu_seed; /* /< Randomize seed */
static uint32_t ul_hundreds_of_ms = 0;
uint32_t ul_tens_of_ms = 0;
uint32_t ul_time_app_emu;
/** @brief Build the time stamp in the buffer requested
*
* @param pc_timestamp Pointer to the current timestamp
*
* This function builds the time stamp included in requests as the number
* of seconds passed since the 00:00 PM.
**/
void app_emu_build_timestamp(char *pc_timestamp)
{
#ifdef __GNUC__
sprintf(pc_timestamp, "%06lu", ul_hundreds_of_ms);
#endif
#ifdef __ICCARM__
sprintf(pc_timestamp, "%06u", ul_hundreds_of_ms);
#endif
return;
}
/** @brief Fill a string with data
*
* @param String Pointer to the buffer to write data
* @param Size Data size to fill
* @param DownUp Boolean to indicate if packet is uplink / downlink
* @param Step Number of step in application
* @param TimeStamp Time stamp with the current instant
*
* This function prepares the data for the packet to be sent and fills it
* with ascii characters
**/
void app_emu_fill_string(char *pc_str, uint16_t us_size, uint8_t uc_down_up,
uint16_t us_step, char *pc_timestamp)
{
uint16_t i;
char c_asc = 'A';
char pc_down_up_str[] = {"UP"};
/* Build the main string to be transmitted */
if (uc_down_up) {
sprintf(pc_down_up_str, "UP");
} else {
sprintf(pc_down_up_str, "DW");
}
sprintf(pc_str, "%s%s%d%s", pc_down_up_str,
PROVIDER, (uint16_t)us_step, pc_timestamp);
/* Fill it with ascii characters */
for (i = (uint16_t)strlen(pc_str); i < us_size; i++) {
pc_str[i] = c_asc;
if (c_asc == 'Z') {
c_asc = 'A';
} else {
c_asc++;
}
}
pc_str[us_size] = '\0';
}
/** @brief Update timers 1 ms
*
* This function update application timers
**/
void app_emu_update_10ms(void)
{
if (ul_time_app_emu) {
ul_time_app_emu--;
}
if (ul_tens_of_ms++ == 10) {
ul_hundreds_of_ms++;
}
}
/** @brief initializes random number generator
*
* @param puc_mac Pointer to the MAC address
*
**/
void app_emu_init_random(const uint8_t *puc_mac)
{
uint8_t i;
l_app_emu_seed = 0;
for (i = 0; i < 6; i++) {
l_app_emu_seed += (uint16_t)puc_mac[i];
}
l_app_emu_seed <<= 2;
}
/** @brief random number generator
*
* @return the random number
*
* rand uses a multiplicative congruential random number generator with period
* 2^32 to return successive pseudo-
* random numbers in the range from 0 to 2^15 - 1.
* The generator is reinitialized by calling srand with an argument value of 1.
* It can be set to a new starting point by
* calling srand with a given seed number.
**/
int app_emu_random(void)
{
l_app_emu_seed = MULTIPLIER * l_app_emu_seed + INCREMENT;
return((int)((uint32_t)l_app_emu_seed >> 16) & 0x7fff);
}
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