Trikarus/firmware_smartstepper_trikarus/stepper_nano_zero/as5047d.cpp

323 lines
8.8 KiB
C++

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Written by Trampas Stern for MisfitTech.
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#include <Arduino.h>
#include "syslog.h"
#include "as5047d.h"
#include "SPI.h"
#include <stdio.h>
#include "board.h"
#define AS5047D_CMD_NOP (0x0000)
#define AS5047D_CMD_ERRFL (0x0001)
#define AS5047D_CMD_PROG (0x0003)
#define AS5047D_CMD_DIAAGC (0x3FFC)
#define AS5047D_CMD_MAG (0x3FFD)
#define AS5047D_CMD_ANGLEUNC (0x3FFE)
#define AS5047D_CMD_ANGLECOM (0x3FFF)
#define AS5048A_CMD_NOP (0x0000)
#define AS5048A_CMD_ERRFL (0x0001)
#define AS5048A_CMD_PROG (0x0003)
#define AS5048A_CMD_DIAAGC (0x3FFD)
#define AS5048A_CMD_MAG (0x3FFE)
#define AS5048A_CMD_ANGLE (0x3FFF)
#pragma GCC push_options
#pragma GCC optimize ("-Ofast")
static int getBit(int16_t data, int bit)
{
return (data>>bit) & 0x01;
}
static int getParity(uint16_t data)
{
int i,bits;
data=data & 0x7FFF; //mask out upper bit
//count number of bits, brute force
bits=0;
for(i=0; i<16; i++)
{
if (0 != (data & ((0x0001)<<i)))
{
bits++;
}
}
return (bits & 0x01); //return 1 if odd
}
boolean AS5047D::begin(int csPin)
{
#ifdef PIN_AS5047D_PWR
digitalWrite(PIN_AS5047D_PWR,HIGH);
#endif
digitalWrite(PIN_AS5047D_CS,LOW); //pull CS LOW by default (chip powered off)
digitalWrite(PIN_MOSI,LOW);
digitalWrite(PIN_SCK,LOW);
digitalWrite(PIN_MISO,LOW);
pinMode(PIN_MISO,OUTPUT);
delay(1000);
digitalWrite(PIN_AS5047D_CS,HIGH); //pull CS high
#ifdef PIN_AS5047D_PWR
digitalWrite(PIN_AS5047D_PWR,LOW);
#endif
pinMode(PIN_MISO,INPUT);
error=false;
SPISettings settingsA(5000000, MSBFIRST, SPI_MODE1); ///400000, MSBFIRST, SPI_MODE1);
chipSelectPin=csPin;
LOG("csPin is %d",csPin);
pinMode(chipSelectPin,OUTPUT);
digitalWrite(chipSelectPin,HIGH); //pull CS high by default
delay(1);
SPI.begin(); //AS5047D SPI uses mode=1 (CPOL=0, CPHA=1)
LOG("Begin AS5047D...");
SPI.beginTransaction(settingsA);
SPI.transfer16(AS5047D_CMD_NOP);
delay(10);
//wait for the LF bit to be set
uint16_t data=0,t0=100;
while (getBit(data,8)==0 && t0>0)
{
delay(1);
t0--;
if (t0==0)
{
ERROR("LF bit not set");
error=true;
break;
//return false;
}
LOG("AS5047D diag data is 0x%04X",data);
data=readAddress(AS5047D_CMD_DIAAGC);
}
if (error)
{
error=false;
uint16_t data=0,t0=100;
while (getBit(data,8)==0 && t0>0)
{
delay(1);
t0--;
if (t0==0)
{
ERROR("AS5048A OCF bit not set");
error=true;
return false;
}
data=readAddress(AS5048A_CMD_DIAAGC);
LOG("AS5048A diag data is 0x%04X",data);
}
as5047d=false;
}
#ifdef NZS_AS5047_PIPELINE
//read encoder a few times to flush the pipeline
readEncoderAnglePipeLineRead();
readEncoderAnglePipeLineRead();
#endif
return true;
}
//read the encoders
int16_t AS5047D::readAddress(uint16_t addr)
{
uint16_t data;
error=false;
//make sure it is a read by setting bit 14
addr=addr | 0x4000;
//add the parity to the command
if (1 == getParity(addr))
{
addr=(addr & 0x7FFF) | 0x8000; //add parity bit to make command even number of bits
}
digitalWrite(chipSelectPin, LOW);
delayMicroseconds(1);
//clock out the address to read
SPI.transfer16(addr);
digitalWrite(chipSelectPin, HIGH);
delayMicroseconds(1);
digitalWrite(chipSelectPin, LOW);
//clock out zeros to read in the data from address
data=SPI.transfer16(0x00);
digitalWrite(chipSelectPin, HIGH);
if (data & (1<<14))
{
//if bit 14 is set then we have an error
ERROR("read command 0x%04X failed",addr);
error=true;
return -1;
}
if (data>>15 != getParity(data))
{
//parity did not match
ERROR("read command parity error 0x%04X ",addr);
error=true;
return -2;
}
data=data & 0x3FFF; //mask off the error and parity bits
return data;
}
//read the encoders
int16_t AS5047D::readEncoderAngle(void)
{
if (as5047d)
{
return readAddress(AS5047D_CMD_ANGLECOM);
}
return readAddress(AS5048A_CMD_ANGLE);
}
//pipelined read of the encoder angle used for high speed reads, but value is always one read behind
int16_t AS5047D::readEncoderAnglePipeLineRead(void)
{
int16_t data;
int error, t0=10;
GPIO_LOW(chipSelectPin);//(chipSelectPin, LOW);
//delayMicroseconds(1);
do {
// doing two 8 bit transfers is faster than one 16 bit
data =(uint16_t)SPI.transfer(0xFF)<<8 | ((uint16_t)SPI.transfer(0xFF) & 0x0FF);
t0--;
if (t0<=0)
{
ERROR("AS5047D problem");
break;
}
//data=SPI.transfer16(0xFFFF); //to speed things up we know the parity and address for the read
}while(data & (1<<14)); //while error bit is set
data=data & 0x3FFF; //mask off the error and parity bits
GPIO_HIGH(chipSelectPin);
//digitalWrite(chipSelectPin, HIGH);
//TODO we really should check for errors and return a negative result or something
return data;
}
void AS5047D::diagnostics(char *ptrStr)
{
int16_t data;
int m,d;
if (as5047d)
{
data=readAddress(AS5047D_CMD_DIAAGC);
if (NULL == ptrStr)
{
LOG("DIAAGC: 0x%04X", data);
LOG("MAGL: %d", getBit(data,11));
LOG("MAGH: %d", getBit(data,10));
LOG("COF: %d", getBit(data,9));
LOG("LFGL: %d", getBit(data,8));
LOG("AGC: %d", data & 0x0FF);
data=readAddress(AS5047D_CMD_MAG);
LOG("CMAG: 0x%04X(%d)",data,data);
data=readAddress(AS5047D_CMD_ANGLEUNC);
m=(int)((float)data*AS5047D_DEGREES_PER_BIT);
d=(int)((float)data*AS5047D_DEGREES_PER_BIT*100 -m*100);
LOG("CORDICANG: 0x%04X(%d) %d.%02d deg(est)",data,data,m,d);
data=readAddress(AS5047D_CMD_ANGLECOM);
m=(int)((float)data*AS5047D_DEGREES_PER_BIT);
d=(int)((float)data*AS5047D_DEGREES_PER_BIT*100 -m*100);
LOG("DAECANG: 0x%04X(%d) %d.%02d deg(est)",data,data,m,d);
}else
{
sprintf(ptrStr,"DIAAGC: 0x%04X\n\r", data);
sprintf(ptrStr,"%sMAGL: %d\n\r", ptrStr,getBit(data,11));
sprintf(ptrStr,"%sMAGH: %d\n\r", ptrStr,getBit(data,10));
sprintf(ptrStr,"%sCOF: %d\n\r", ptrStr, getBit(data,9));
sprintf(ptrStr,"%sLFGL: %d\n\r", ptrStr, getBit(data,8));
sprintf(ptrStr,"%sAGC: %d\n\r", ptrStr,data & 0x0FF);
data=readAddress(AS5047D_CMD_MAG);
sprintf(ptrStr,"%sCMAG: 0x%04X(%d)\n\r", ptrStr,data,data);
data=readAddress(AS5047D_CMD_ANGLEUNC);
m=(int)((float)data*AS5047D_DEGREES_PER_BIT);
d=(int)((float)data*AS5047D_DEGREES_PER_BIT*100 -m*100);
sprintf(ptrStr,"%sCORDICANG: 0x%04X(%d) %d.%02d deg(est)\n\r", ptrStr,data,data,m,d);
data=readAddress(AS5047D_CMD_ANGLECOM);
m=(int)((float)data*AS5047D_DEGREES_PER_BIT);
d=(int)((float)data*AS5047D_DEGREES_PER_BIT*100 -m*100);
sprintf(ptrStr,"%sDAECANG: 0x%04X(%d) %d.%02d deg(est)\n\r", ptrStr,data,data,m,d);
}
} else
{
data=readAddress(AS5048A_CMD_DIAAGC);
sprintf(ptrStr,"AS5048A DIAAGC: 0x%04X\n\r", data);
data=readAddress(AS5048A_CMD_MAG);
sprintf(ptrStr,"%sMagnitude: %d\n\r", ptrStr,data);
data=readAddress(AS5048A_CMD_ANGLE);
sprintf(ptrStr,"%sAngle: %d\n\r", ptrStr,data);
}
}
#pragma GCC pop_options