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BuckPSU.cpp
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BuckPSU.cpp
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/**
* BuckPSU.cpp
*
* Library for interfacing with UART on Chinese DC-DC converters.
* Ben James (benjames.io)
*
* The port used can be any of type `Stream`.
* This has the side effect of needing to manually begin the Serial
* port (if it's a Serial port that's used), but hopefully means that
* this lib is more flexible.
some poorly written documentation for the protocol from Drok:
https://www.droking.com/cs/support/topic/200220-dc-dc-buck-converter-uart/#post-35186
Ben's realted blog post:
https://blog.benjames.io/2018/06/29/secret-uart-on-chinese-dcdc-converters/
*/
#include "Arduino.h"
#include "BuckPSU.h"
/**
* Constructor.
* The Serial port passed in must be manually 'begun' in the main
* program.
* This is because the Stream class is used to provide extensiblity,
* but Stream has no way of beginning a Serial port.
*/
BuckPSU::BuckPSU(Stream &port)
{
_port = &port;
}
/**
* Turns the buck PSU output on or off.
* @param status true to enable output, false to disable output
*/
void BuckPSU::enableOutput(bool status)
{
if(status){
_port->println("awo1");
}
else
{
_port->println("awo0");
}
}
/**
* Enable or disable the power supply being on it's ON mode when it gets power applied.
* @param status true to enable output, false to disable output
*/
void BuckPSU::enableAuto(bool status)
{
if(status){
_port->println("awy1");
}
else
{
_port->println("awy0");
}
}
/**
* Enable or disable the lock on the button interface for local control.
* @param status true to enable lock, false to disable lock
*/
void BuckPSU::enableLock(bool status)
{
if(status){
_port->println("awl1");
}
else
{
_port->println("awl0");
}
}
/**
* Enable or disable the power supply numberic display.
* @param status true to enable display, false to disable display
*/
void BuckPSU::enableDisplay(bool status)
{
if(status){
_port->println("awd1");
}
else
{
_port->println("awd0");
}
}
/**
* Set memory location - location 0 is default for power up there are 10 locations (0-9).
* @param memoy location to store settings at
*/
void BuckPSU::setMemory(int loc)
{
char msg[8];
sprintf(msg, "aws%d", loc);
_port->println(msg);
}
/**
* Recall location - location 0 is defualt for power up there are 10 locations (0-9).
* @param memoy location to store settings at
*/
void BuckPSU::getMemory(int loc)
{
char msg[8];
sprintf(msg, "awm%d", loc);
_port->println(msg);
}
/**
* Read the status of the PSU output
* @return bool of whether the output is enabled or not
*/
bool BuckPSU::getOutputEnabled()
{
char msg[16];
// Request output status
_port->println("aro");
_port->readBytes(msg, 16);
return (msg[13] == '1') ? true : false;
}
/**
* Read the status of the PSU output state on power up
* @return bool of whether the auto output is enabled or not
*/
bool BuckPSU::getAutoEnabled()
{
char msg[16];
// Request output status
_port->println("ary");
_port->readBytes(msg, 16);
return (msg[13] == '1') ? true : false;
}
/**
* Read the status if the main buttons, local interface are enabled or not
* @return bool of whether the main button interface is enabled or not
*/
bool BuckPSU::getLockEnabled()
{
char msg[16];
// Request output lock status
_port->println("arl");
_port->readBytes(msg, 16);
return (msg[13] == '1') ? true : false;
}
/**
* Reads the current voltage on the OUTPUT (not the voltage that's set).
* @return voltage in millivolts
*/
uint16_t BuckPSU::readVoltageMilliVolts()
{
char header[10];
char msg[4];
char footer[2];
// Request voltage reading
_port->println("aru");
_port->readBytes(header, 10);
_port->readBytes(msg, 4);
_port->readBytes(footer, 2);
// Convert byte messsage to int and return as millivolts
return atoi(msg) * 10;
}
/**
* Reads the current timer in minutes
* @return minutes
*/
uint16_t BuckPSU::readTimer()
{
char header[10];
char msg[4];
char footer[2];
// Request timer reading
_port->println("art");
_port->readBytes(header, 8);
_port->readBytes(msg, 6);
_port->readBytes(footer, 2);
// Convert byte messsage to int and return as millivolts
return atoi(msg);
}
/**
* Reads the capacity in minutes
* @return Amp Hours
*/
uint16_t BuckPSU::readCapacity()
{
char header[10];
char msg[4];
char footer[2];
// Request capacity reading
_port->println("arc");
_port->readBytes(header, 8);
_port->readBytes(msg, 6);
_port->readBytes(footer, 2);
// Convert byte messsage to int and return as millivolts
return atoi(msg);
}
/**
* Reads the current through the OUTPUT (not the current limit that's set).
* @return Current in milliamps
*/
uint16_t BuckPSU::readCurrentMilliAmps()
{
char header[10];
char msg[4];
char footer[2];
// Request voltage reading
_port->println("ari");
_port->readBytes(header, 10);
_port->readBytes(msg, 4);
_port->readBytes(footer, 2);
// Convert byte messsage to int and return as milliamps
return atoi(msg) * 10;
}
/**
* Reads the current set point.
* @return Current in milliamps
*/
uint16_t BuckPSU::readSetMilliAmps()
{
char header[10];
char msg[4];
char footer[2];
// Request voltage reading
_port->println("ara");
_port->readBytes(header, 10);
_port->readBytes(msg, 4);
_port->readBytes(footer, 2);
// Convert byte messsage to int and return as milliamps
return atoi(msg) * 10;
}
/**
* Reads the voltage set point.
* @return Volts in milliamps
*/
uint16_t BuckPSU::readSetMilliVolts()
{
char header[10];
char msg[4];
char footer[2];
// Request voltage reading
_port->println("arv");
_port->readBytes(header, 10);
_port->readBytes(msg, 4);
_port->readBytes(footer, 2);
// Convert byte messsage to int and return as milliamps
return atoi(msg) * 10;
}
/**
* Convert an int (usually millivolts or milliamps) to the format
* required by the PSU, which is four characters up to e-2.
* Eg 12340 should return '1234', 150 should return '0015'
*
* @param buf char array to fill with conversion output
* @param input The integer to convert
*/
void BuckPSU::intToFourCharStr(char *buf, uint16_t input)
{
// Convert from milli to centi
input /= 10;
// Iterate through units, tens, hundreds etc
for(int digit = 0; digit < 4; digit++)
{
buf[3 - digit] = ((input / ((int) pow(10, digit))) % 10) + '0';
}
}
/**
* Set the PSU voltage (doesn't neccessary enable the output)
* @param millivolts The voltage to set
*/
void BuckPSU::setVoltageMilliVolts(uint16_t millivolts)
{
char voltage[5];
intToFourCharStr(voltage, millivolts);
// Terminate char array
voltage[4] = '\0';
// Send command to PSU
_port->print("awu");
_port->println(voltage);
}
/**
* Set the PSU current limit
* @param milliamps The current limit to set in milliamps
*/
void BuckPSU::setCurrentMilliAmps(uint16_t milliamps)
{
char current[5];
intToFourCharStr(current, milliamps);
// Terminate char array
current[4] = '\0';
// Send command to PSU
_port->print("awi");
_port->println(current);
}