Meter Calibration routine. More...

Functions
void	init_ADC (void)
void	clock_init (void)
	This function intialises the CPU clock to 32MHz and enable the DFLL for runtime calibration of 32MHz internal Rc oscillator.
void	delay_ms (uint16_t)
	Perform a delay of `milliseconds`.
void	facilitatePowersaving (void)
void	get_offset (void)
void	init_eeprom (void)
	This function loads the eeprom vaules during the startup.
void	init_UART (void)
	This function initializes the UARTC1 to 8 Data bits, No Parity, 1 Stop bit, 38400bps.
void	init_ioport (void)
	This function initializes the IOPORTS.
void	init_lcd (void)
void	init_power_reduction (void)
	This function disables the clock to unused peripherals and there by reduces the current consumption.
void	init_timer (void)
	This function disables the clock to unused peripherals and there by reduces the current consumption.

Detailed Description

Meter Calibration routine.

Application note:: AVR1631: Energy Meter Reference Design with ATxmega32A4

Documentation: For comprehensive code documentation, supported compilers, compiler settings and supported devices see readme.html

Author: Atmel Corporation: http://www.atmel.com
Support email: avr@a.nosp@m.tmel.nosp@m..com

$Revision: 1.0
$Date: 2012-07-01 10:10:10 +0530

Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met:

Redistributions of source code must retain the above copyright notice, this list of conditions and the following disclaimer.

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.

The name of ATMEL may not be used to endorse or promote products derived from this software without specific prior written permission.

THIS SOFTWARE IS PROVIDED BY ATMEL "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 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.

Definition in file meter_initialisation.h.

Function Documentation

void clock_init ( void )

This function intialises the CPU clock to 32MHz and enable the DFLL for runtime calibration of 32MHz internal Rc oscillator.

The 32.768KHz external crystal is used as reference clock for DFLL

Enable the 32MHz internal RC oscillator

Enable the DFLL for runtime calibration of 32MHz internal RC oscillator

Definition at line 98 of file meter_initialisation.c.

void delay_ms ( uint16_t ms )

Perform a delay of milliseconds.

Parameters

ms	contains the required delay in milli seconds

Definition at line 59 of file meter_initialisation.c.

void facilitatePowersaving ( void )

brief This function enable pullup on all port pins and set the pins to input mode

Definition at line 455 of file meter_initialisation.c.

void get_offset ( void )

brief This function calculate the ADC offset values for different gain stage.

Parameters

offset[ ] This array hold the offset values at different gain stages.

Definition at line 377 of file meter_initialisation.c.

void init_ADC ( void )

brief This function initializes the ADC

Set up ADC A to have signed conversion mode and 12 bit resolution.

Set ADC clock frequency to FCPU/128

Set referance voltage on ADC A to be INT 1V.

*************** ADC Channel 0 ********************************
connected to the shunt resistor for current measumemnt in Phase line

Setup channel 0 to have diff gain input.

Set input to the channels in ADC A to be PIN 0 and PIN 4.

Enable medium level interrupts on ADCA channel 0, on conversion complete. */

**********************************************************************/

*************** ADC Channel 1 ********************************
connected to the voltage divider resistor for voltage measumemnt
Setup channel 1 to have diff gain input.

Set input to the channels in ADC A to be PIN 0 and PIN 4.

Enable medium level interrupts on ADCA channel 0, on conversion complete.

*********************************************************************/

*************** ADC Channel 2 ********************************
connected to the CT for current measumemnt in neutral line
Setup channel 1 to have diff gain input.

Set input to the channels in ADC A to be PIN 0 and PIN 4.

Enable medium level interrupts on ADCA channel 0, on conversion complete.

*******************************************************************/

unused

Enable PMIC interrupt level high.

Enable global interrupts.

Enable ADC A with free running mode, VCC reference and signed conversion.

Wait until common mode voltage is stable. Default clock is 32MHz and therefore below the maximum frequency to use this function.

clear all the varilable used in for energy calculation

Definition at line 271 of file meter_initialisation.c.

void init_eeprom ( void )

This function loads the eeprom vaules during the startup.

Parameters

refer the struct eeprom in meter.h

Definition at line 218 of file meter_initialisation.c.

void init_ioport ( void )

This function initializes the IOPORTS.

PORTB GPIO pin confuguration
PIN0_bm –> TAMPER_CURRENT_REVERSAL indication
PIN1_bm –> TAMPER_EARTH_FAULT indication
PIN2_bm –> LCD switch
PIN3_bm –> TAMPER_NEUTRAL_CUT indication

PORTC GPIO pin confuguration
PIN0_bm –> TWI connector
PIN1_bm –> TWI connector
PIN2_bm –> Cover open switch
PIN3_bm –> Calibration switch
PIN4_bm –> Magnetic Tamper detect
PIN5_bm –> unused switch
PIN6_bm –> UART Rx
PIN7_bm –> UART Tx

PORTD GPIO pin confuguration
PIN0_bm –> LED Pulse
PIN1_bm –> LCD Backlight control
PIN2_bm –> sleep detect
PIN3_bm –> LED debugging and status update
PIN4_bm –> Battery On/Off control
PIN5_bm –> USB D-
PIN6_bm –> USB D+
PIN7_bm –> LCD pin(optional)

Definition at line 120 of file meter_initialisation.c.

void init_power_reduction ( void )

This function disables the clock to unused peripherals and there by reduces the current consumption.

Definition at line 237 of file meter_initialisation.c.

void init_timer ( void )

This function disables the clock to unused peripherals and there by reduces the current consumption.

Definition at line 253 of file meter_initialisation.c.

void init_UART ( void )

This function initializes the UARTC1 to 8 Data bits, No Parity, 1 Stop bit, 38400bps.

Set UART TXD Pin(Pin3) as Output and RXD(Pin 2) Pin as Input Port

Configure USART Control Register, Character Size,Parity,Stop Bit to For example 8 Data bits, No Parity, 1 Stop bit

Configure USART Baud Rate value, 38400bps

Enable Both USART Receiver and Transmitter

Definition at line 192 of file meter_initialisation.c.

Functions

Detailed Description

Function Documentation