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add GetChecksum function #39

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2ea54df
add GetChecksum function
ffonck Jun 8, 2023
7bd5431
Now using cpp convention
ffonck Jun 8, 2023
c304c3a
Now adjusting from C to CPP because inttypes
ffonck Jun 8, 2023
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57 changes: 35 additions & 22 deletions energyic_UART.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -137,48 +137,61 @@ unsigned short ATM90E26_UART::GetSysStatus() {
return CommEnergyIC(1, SysStatus, 0xFFFF);
}

unsigned short ATM90E26_UART::GetChecksum(unsigned short *hex_values, int length) {
unsigned short value = 0x0000;
unsigned char lsb, msb;
int chk1 = 0, chk2 = 0;

for (int i = 0; i < length; i++) {
msb = (hex_values[i] >> 8);
lsb = (hex_values[i] & 0x00FF);
chk1 += msb + lsb;
chk2 ^= msb ^ lsb;
}
value = chk1 % 0x100;
value += (chk2 << 8);

return value;
}

/*
Initialise Energy IC, assume UART has already began in the main code
*/
void ATM90E26_UART::InitEnergyIC() {
unsigned short systemstatus;

// Base Configuration for 21H-2BH
unsigned char reg_adr1[CfgRegLen1] = {PLconstH,PLconstL,Lgain,Lphi,Ngain,Nphi,PStartTh,PNolTh,QStartTh,QNolTh,MMode};
unsigned short reg_values1[CfgRegLen1] = {0x00B9,0xC1F3,0x1D39,0x0000,0x0000,0x0000,0x08BD,0x0000,0x0AEC,0x0000,0x9422};
//Base Configuration for 31H-3AH.
unsigned char reg_adr2[CfgRegLen2] = {Ugain,IgainL,IgainN,Uoffset,IoffsetL,IoffsetN,PoffsetL,QoffsetL,PoffsetN,QoffsetN};
unsigned short reg_values2[CfgRegLen2] = {0xD464,0x6E49,0x7530,0x0000,0x0000,0x0000,0x0000,0x0000,0x0000,0x0000};

CommEnergyIC(0, SoftReset, 0x789A); // Perform soft reset
CommEnergyIC(0, FuncEn, 0x0030); // Voltage sag irq=1, report on warnout
// pin=1, energy dir change irq=0
CommEnergyIC(0, SagTh, 0x1F2F); // Voltage sag threshhold

// Set metering calibration values
CommEnergyIC(0, CalStart, 0x5678); // Metering calibration startup command.
// Register 21 to 2B need to be set
CommEnergyIC(0, PLconstH, 0x00B9); // PL Constant MSB
CommEnergyIC(0, PLconstL, 0xC1F3); // PL Constant LSB
CommEnergyIC(0, Lgain, 0x1D39); // Line calibration gain
CommEnergyIC(0, Lphi, 0x0000); // Line calibration angle
CommEnergyIC(0, PStartTh, 0x08BD); // Active Startup Power Threshold
CommEnergyIC(0, PNolTh, 0x0000); // Active No-Load Power Threshold
CommEnergyIC(0, QStartTh, 0x0AEC); // Reactive Startup Power Threshold
CommEnergyIC(0, QNolTh, 0x0000); // Reactive No-Load Power Threshold
CommEnergyIC(0, MMode, 0x9422); // Metering Mode Configuration. All defaults.
// See pg 31 of datasheet.
CommEnergyIC(0, CSOne, 0x4A34); // Write CSOne, as self calculated
// This loop iterates though above configurations from 21H-2BH registers.
for (int i = 0; i < CfgRegLen1; i++) {
CommEnergyIC(0, reg_adr1[i], reg_values1[i]);
} // See pg 31 of datasheet.
CommEnergyIC(0, CSOne, GetChecksum(reg_values1, CfgRegLen1)); // Write CSOne, as self calculated

Serial.print("Checksum 1:");
Serial.println(
CommEnergyIC(1, CSOne, 0x0000),
HEX); // Checksum 1. Needs to be calculated based off the above values.

// Set measurement calibration values
CommEnergyIC(
0, AdjStart,
0x5678); // Measurement calibration startup command, registers 31-3A
CommEnergyIC(0, Ugain, 0xD464); // Voltage rms gain
CommEnergyIC(0, IgainL, 0x6E49); // L line current gain
CommEnergyIC(0, Uoffset, 0x0000); // Voltage offset
CommEnergyIC(0, IoffsetL, 0x0000); // L line current offset
CommEnergyIC(0, PoffsetL, 0x0000); // L line active power offset
CommEnergyIC(0, QoffsetL, 0x0000); // L line reactive power offset
CommEnergyIC(0, CSTwo, 0xD294); // Write CSTwo, as self calculated
CommEnergyIC(0, AdjStart, 0x5678); // Measurement calibration startup command, registers 31-3A
// This loop iterates though above configurations from 31H-3AH registers.
for (int i = 0; i < CfgRegLen2; i++) {
CommEnergyIC(0, reg_adr2[i], reg_values2[i]);
}
CommEnergyIC(0, CSTwo, GetChecksum(reg_values2, CfgRegLen2)); // Write CSTwo, as self calculated

Serial.print("Checksum 2:");
Serial.println(
Expand Down
3 changes: 3 additions & 0 deletions energyic_UART.h
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Original file line number Diff line number Diff line change
Expand Up @@ -48,6 +48,7 @@
#define QNolTh 0x2A // Reactive No-Load Power Threshold
#define MMode 0x2B // Metering Mode Configuration
#define CSOne 0x2C // Checksum 1
#define CfgRegLen1 11 // Amount of register for Checksum 1
#define AdjStart 0x30 // Measurement Calibration Start Command
#define Ugain 0x31 // Voltage rms Gain
#define IgainL 0x32 // L Line Current rms Gain
Expand All @@ -60,6 +61,7 @@
#define PoffsetN 0x39 // N Line Active Power Offset
#define QoffsetN 0x3A // N Line Reactive Power Offset
#define CSTwo 0x3B // Checksum 2
#define CfgRegLen2 10 // Amount of register for Checksum 2
#define APenergy 0x40 // Forward Active Energy
#define ANenergy 0x41 // Reverse Active Energy
#define ATenergy 0x42 // Absolute Active Energy
Expand Down Expand Up @@ -95,6 +97,7 @@ class ATM90E26_UART {
void InitEnergyIC();
unsigned short GetSysStatus();
unsigned short GetMeterStatus();
unsigned short GetChecksum(unsigned short *hex_values, int length);

private:
unsigned short CommEnergyIC(unsigned char RW, unsigned char address,
Expand Down