I am so sorry grease_lighting, I am pretty new to Arduino and Teency and it is not easy for me to understand the FTM code.
SPI library on Teency 3.2
- Thread starter Lorenzo
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I am so sorry grease_lighting, I am pretty new to Arduino and Teency and it is not easy for me to understand the FTM code.
Wozzy
Well-known member
Lorenzo,
Let's try isolate if the problem is with the encoders or with the LS7366R communication.
Hook up the Teensy as listed in the file header comments then try to run this program.
Power the LS7366R board from 5 Volts. (The data sheet says that it has a 40mhz crystal on the board, and that's only reliable at 5V.)
This program writes numbers to the 32-bit CNTR register in the LS7366R, then reads them back. No encoder is needed.
This will tell you if you are communicating with the LS7366R Quadrature Decoder Chip.
The serial output in the Arduino serial monitor should look something like this:
Let's try isolate if the problem is with the encoders or with the LS7366R communication.
Hook up the Teensy as listed in the file header comments then try to run this program.
Power the LS7366R board from 5 Volts. (The data sheet says that it has a 40mhz crystal on the board, and that's only reliable at 5V.)
This program writes numbers to the 32-bit CNTR register in the LS7366R, then reads them back. No encoder is needed.
This will tell you if you are communicating with the LS7366R Quadrature Decoder Chip.
Code:
/*
* LS7366R COMMUNICATION TEST
*
* LS7366R Teensy
* 4 SS 10 SS
* 5 SCK 14 ALT SCK
* 6 MISO 11 MOSI
* 7 MOSI 12 MISO
13 Builtin LED
*/
#include <SPI.h>
#define CLR B00000000
#define RD B01000000
#define WR B10000000
#define LOAD B11000000
#define MDR0 B00001000
#define MDR1 B00010000
#define DTR B00011000
#define CNTR B00100000
#define OTR B00101000
#define STR B00110000
#define SS 10 // Slave Select Pin
#define LED 13 // Teensy 3 Builtin LED
// filter factor 1
// async index
// no index
// free-running
// 4x quadrature
#define MDR0_CONF B00000011
// no flag
// enabled
// 32 bits
#define MDR1_CONF B00000000
SPISettings settings(16000000, MSBFIRST, SPI_MODE1);
void setup() {
Serial.begin(9600);
pinMode(LED, OUTPUT);
pinMode(SS, OUTPUT);
SPI.setSCK(14); //redefine SCK from Pin 13 to Pin 14 for Teensy3.2
//SPI.setMOSI(7); //alternate Teensy 3X MOSI pin, pin 11 is default
//SPI.setMISO(8); //alternate Teensy 3X MISO pin, pin 12 is default
SPI.begin();
pinMode(SS, OUTPUT);
SPI.beginTransaction(settings);
digitalWrite(SS, LOW);
SPI.transfer(WR | MDR0);
SPI.transfer(MDR0_CONF);
digitalWrite(SS, HIGH);
digitalWrite(SS, LOW);
SPI.transfer(WR | MDR1);
SPI.transfer(MDR1_CONF);
digitalWrite(SS, HIGH);
digitalWrite(SS, LOW);
SPI.transfer(CLR | CNTR);
digitalWrite(SS, HIGH);
SPI.endTransaction();
}
long count = 0;
void loop() {
for (byte COUNTER = B00000000; COUNTER <= B11111111; COUNTER++){
// Write Numbers to DTR then parallel shift to CNTR
SPI.beginTransaction(settings);
digitalWrite(SS, LOW);
SPI.transfer(WR|DTR);
SPI.transfer(COUNTER);
SPI.transfer(COUNTER);
SPI.transfer(COUNTER);
SPI.transfer(COUNTER);
digitalWrite(SS, HIGH);
delayMicroseconds(10);
digitalWrite(SS, LOW);
SPI.transfer(LOAD|CNTR);
digitalWrite(SS, HIGH);
delayMicroseconds(10);
digitalWrite(SS, LOW);
// Read Numbers from CNTR
SPI.transfer((byte) RD | CNTR);
count = SPI.transfer(0x00);
count <<= 8;
count |= SPI.transfer(0x00);
count <<= 8;
count |= SPI.transfer(0x00);
count <<= 8;
count |= SPI.transfer(0x00);
digitalWrite(SS, HIGH);
SPI.endTransaction();
Serial.print(count);
Serial.println();
digitalWrite(13,!digitalRead(13));
delayMicroseconds(50000);
}
}The serial output in the Arduino serial monitor should look something like this:
Hi Wozzy,
Thank you very much.
I have powered the LS7366R board with a separate 5V power and now I can correctly read the encoders!
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