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1. 

   cherigo
   Member

   hi guys i am new in this forum my question is the next :
   i have a flymaple that i am trying connect to a quadrature counter LS7366R the code for do this is available in arduino. the communication is spi; between the maple and the counter but i not sure how work the SPI library in maple

   ARDUINO CODE
   #include <SPI.h>
   //#include <Arduino.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

   // filter factor 1
   // async index
   // no index
   // free-running
   // 4x quadrature
   #define MDR0_CONF B00000011

   // no flag
   // enabled
   // 32 bits
   #define MDR1_CONF B00000000

   void setup() {
   Serial.begin(9600);
   SPI.begin();
   pinMode(SS, OUTPUT);

   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);
   }

   long count = 0;

   void loop() {
   digitalWrite(SS, LOW);
   byte b = 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);
   count = count*0.351;
   digitalWrite(SS, HIGH);
   Serial.print(count);
   Serial.println();

   }

   //////////////////////////////////////////////////////////////////////
   i suppose that is the way to do in flymaple board but not working

   #include <spi.h>

   #define CLR 0x00
   #define RD 0x40
   #define WR 0x80
   #define LOAD 0xC0

   #define MDR0 0x08
   #define MDR1 0x10
   #define DTR 0x18
   #define CNTR 0x20
   #define OTR 0x28
   #define STR 0x30

   // filter factor 1
   // async index
   // no index
   // free-running
   // 4x quadrature
   #define MDR0_CONF 0x03

   // no flag
   // enabled
   // 32 bits
   #define MDR1_CONF 0x00

   HardwareSPI spi(2);

   void setup() {
   spi.begin(SPI_18MHZ, MSBFIRST, 0);
   SerialUSB.begin();
   pinMode(D31, OUTPUT);

   digitalWrite(D31, LOW);
   spi.transfer(WR | MDR0);
   spi.transfer(MDR0_CONF);
   digitalWrite(D31, HIGH);

   digitalWrite(D31, LOW);
   spi.transfer(WR | MDR1);
   spi.transfer(MDR1_CONF);
   digitalWrite(D31, HIGH);

   digitalWrite(D31, LOW);
   spi.transfer(CLR | CNTR);
   digitalWrite(D31, HIGH);

   }

   long count = 0;

   void loop() {
   digitalWrite(D31, LOW);
   byte b = spi.transfer( RD | CNTR);
   count = spi.transfer(0x00);
   count <<= 8;
   count |= spi.transfer(0x00);
   count <<= 8;
   count |= spi.transfer(0x00);
   count <<= 8;
   count |= spi.transfer(0x00);
   count = count*0.351;
   digitalWrite(D31, HIGH);

   SerialUSB.print(count);
   SerialUSB.println();
   }

   please please help

   Posted 4 months ago #
2. 

   gbulmer
   Moderator

   @cherigo - Welcome to the forum.

   Would you please confirm that this LS7366R is the device?

   What exactly do you mean by "not working"?

   At first glance, the code looks okay. Have you access to an oscilloscope to see that the signal matches the Arduino's?

   I would try to make it behave as closely as reasonable to the arduino code, so I might change the SPI speed in
   spi.begin(SPI_18MHZ, MSBFIRST, 0);
   to
   spi.begin(SPI_4_5MHZ, MSBFIRST, 0);

   Have you got access to an easy to use device to test the SPI? For example a 74HC595 SIPO shift-register. They are reasonably low-cost (about $2 for 5)

   There is an example of how to drive that 74HC595 using software here.
   It should be easy to monitor it working by putting a few LEDs on its output pins.

   (Full disclosure: I am not a member of LeafLabs staff.)

   Posted 4 months ago #

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