Compiler/MSP430G2553: Interfacing ADE7753 with MSP430G2553

Hi Alex, thanks for your post. on startup of Energia, Please refer to this page the basic example on MSP430G2 Launchpad.

Hi Xiaodong, thanks a lot for your response!

I´m already using the Energia Library but I didn't have success to connect My MSP430G2553 with ADE7753 via SPI, I change bound rate and SPI mode to check and also I didn't have success. I share here my code. 

i hope somebody might have done the interface before and let me know one first direction to do it!

Best Regards,

Alex

// the sensor communicates using SPI, so include the library:
#include <SPI.h>
#include "Energia.h"

//REGISTRADORES ADE7753 - Sensor's memory register addresses:
#define MODE 0x09
#define STATUS 0x0B
#define RSTSTATUS 0x0C
#define IRMS 0x16
#define VRMS 0x17
#define PERIOD 0x27
#define AENERGY 0x02
#define VAENERGY 0x05

const byte READ = 0b00000000;   // ADE7753 read command
const byte WRITE = 0b10000000;  // ADE7753 write command

/* DIN = MOSI - 17 - VERDE
 *  DOUT = MISO - 19 - AMARELO
 * CS = SS - 17 - AZUL
 * SCLK = SCLK - 18 - LARANAJA
 * CS - chipSelectPin - to digital pin 9  (SS pin) P2.1 - AZUL
 * SIMO / MOSI is Pin 1.7 - VERDE
 * SOMI / MISO is Pin 1.6 - AMARELO
 * CLK - to digital pin 7 (SCLK pin) P1.5 - LARANJA
 */


//Pin declarations Sensor and correlated at MSP430G2
#define DATAOUT 15//MOSI - 20 DIN - MOD. ADE7753 - VERDE 
#define DATAIN  14//MISO - 19 DOUT - MOD. ADE7753 - AMARELO
#define SPICLOCK  7//sck - 18 - MOD. ADE7753 - LARANJA
#define SLAVESELECT 9// chipSelect - 17 MOD. ADE7753 - AZUL

void setup()
{
    // put your setup code here, to run once:
    Serial.begin(9600);
     // start the SPI library:
    SPI.begin();
    SPI.setDataMode(SPI_MODE0); // CPOL =0 and CPHA =0 
    // initialize the  data ready and chip select pins:
    //SPI.setBitOrder(MSBFIRST);
    SPI.setClockDivider(4); // the command is to use SPI =  or 4 MHz
    pinMode(SLAVESELECT, OUTPUT);
    pinMode(DATAOUT, OUTPUT);
    pinMode(DATAIN, INPUT);
    //pinMode(SPICLOCK,OUTPUT);
    digitalWrite(SLAVESELECT, HIGH);    
    delay(100);
}

void loop(){
    digitalWrite(SLAVESELECT, LOW);
    SPI.transfer (READ);  // has bits set for a read or write command, and the register address
    digitalWrite(SLAVESELECT, HIGH);
    //SPI.endTransaction();
    delay(100);
    digitalWrite(SLAVESELECT, LOW);
    long regRead = SPI.transfer(IRMS); // read a register
    //SPI.transfer (registerData); // or data to write into a register
    digitalWrite(SLAVESELECT, HIGH);
    //SPI.endTransaction();
    delay(100);
}

>     long regRead = SPI.transfer(IRMS); // read a register

This just sends the first byte of the transaction. To read a 24-bit result, you need 3 more bytes. [Ref ADE7753 Data sheet (Rev C) Figs 90 and 94]. This would look something like:

unsigned char hi, mid, lo;  // 3 successive bytes over the SPI
unsigned long regRead;      // pasted together
(void)SPI.transfer(IRMS);   // read-register request byte
hi = SPI.transfer(0x00);    // Write dummy byte, read high byte,
mid = SPI.transfer(0x00);   // middle byte,
lo = SPI.transfer(0x00);    //  low byte
regRead = ((unsigned long)hi << 2*8) | ((unsigned long)mid << 1*8) | ((unsigned long)lo << 0*8); // Paste

Since all the registers appear to be 24-bit [Ref Table 12], you'll probably find it useful to wrap this into a function.

Hi Bruce, thanks a lot. for your assistance!

I have ran your code but I didn't have a success also! 

I have found a Arduino Code, and I couldn't test if it works, but I think the logical code sounds good. I have made a mix between your advice and this Arduino code. I´ll before explain better my initial MSP430G2 initial setting bellow:

reference Arduino code: https://pingu98.wordpress.com/tag/ade7753-power-meter/

Before I would like to explain better my MSP430 settings:

Clock at 16 Mhz and SPI clock setting  SPI.setClockDivider(4) that show at Pin out 3,91 Mhz. 

SPI Pins are : 14 (P1.6),15 (P1.7), 7 (P1.5) and 8 (P2.0) / ADE7753 DOUT, DIN, SCLK and SS respectively. 

Baud Rate is: 9.600, It I have several doubts, I have see on internet Arduino codes using 9.600 or 115200.

I have using TX controlling (!(IFG2 & UCB0TXIFG)) get form msp430g2553 library in my code to check if TX buffer is ready to send bytes.  Could you see it in my code below:

My CODE:

#include <SPI.h>
#include "Energia.h"
#include <msp430g2553.h>

//registers on ADE7753 
#define IRMS 0x16
#define VRMS 0x17

const byte READ = 0b00000000;   // ADE7753 read command
const byte WRITE = 0b10000000;  // ADE7753 write command
byte ADE7753_output_data;
//int address=0;

 //Pin declarations Sensor and correlated at MSP430G2
#define DATAOUT 15//MOSI - 20 DIN - MOD. ADE7753 - VERDE 
#define DATAIN  14//MISO - 19 DOUT - MOD. ADE7753 - AMARELO
#define SPICLOCK  7//sck - 18 - MOD. ADE7753 - LARANJA
#define SLAVESELECT 8// chipSelect - 17 MOD. ADE7753 - AZUL

// transmite um caracter pela interface serial with shift register controller
char spi_transfer(volatile char data)
{
    while (!(IFG2 & UCB0TXIFG))     // Wait the end of the transmission and TX buffer to be ready for new data
    {
      UCA0TXBUF = data;     // starting the TX byte
    };
    return UCA0RXBUF;    // I have doubts if use UCA0RXBUF or UCA0TXBUF. I have all those cases.
}

void setup()
{
    // put your setup code here, to run once:
    Serial.begin(9600);
     // start the SPI library:
    SPI.begin(); /* Initialize SPI */
    SPI.setDataMode(SPI_MODE0); // CPOL =0 and CPHA =0 
    SPI.setClockDivider(4); // the command is to use SPI =  or 4 MHz,DIV4 = 3,91MHZ , DIV5 = 3,13MHZ

    pinMode(SLAVESELECT, OUTPUT);
    digitalWrite(SLAVESELECT, HIGH);  
    pinMode(DATAOUT, OUTPUT);
    pinMode(DATAIN, INPUT);
    // configuring interruption of the serial interface (reception)
    IE2 |= BIT0;    // Active the serial interruption
    IFG2 &= ~UCA0RXIFG;   // clear the Serial Interrupt RX flag
    delay(100);
}

long read_ADE7753MEM(int ADE7753_MEM_address, int bytes_to_read)
{
  //Serial.print("Multi-readddr>");
  //Serial.print(EEPROM_address, HEX);
  //Serial.println(" Data starts:");
  long data = 0;
  byte reader_buf = 0;
  //byteRead =0;
  digitalWrite(SLAVESELECT,LOW);
  spi_transfer((char)(ADE7753_MEM_address));      //send MSB 00 + LSByte Register address
 // here there should be a t9 delay
  for (int i = 1; i < bytes_to_read; i++){
    reader_buf = spi_transfer(0x00); //get data byte

    data = data|reader_buf;
    if (i< bytes_to_read) {
      data = data<<8;
    }
}
void loop()
{
   ADE7753_output_data = read_ADE7753MEM(VRMS,3);
   //Serial.println("STATUS VRMS");
   //Serial.println(ADE7753_output_data, BIN);
   //Serial.println(ADE7753_output_data, HEX);
   delay(1000);
}

I always see on  "data" = data|reader_buf as zero when using debugger on CCS.

Would you can give new idea how to fix it?

BR,

Alex

If you're using P1.6-7, you're using UCB0.  Here's a suggested spi_transfer() [untested, but I think it's about right]:

unsigned char spi_transfer(unsigned char data)
{
    while (!(IFG2&UCB0TXIFG)) /*EMPTY*/;   // Wait for TXBUF to be empty
    UCB0TXBUF = data;
    while (!(IFG2&UCB0RXIFG)) /*EMPTY*/;  // Wait for RXBUF to be full
    data = UCB0RXBUF;
    return(data);
}

----------------

> for (int i = 1; i < bytes_to_read; i++){

This only reads two bytes. Try:

> for (int i = 0; i < bytes_to_read; i++){

----------------

>    SPI.setDataMode(SPI_MODE0); // CPOL =0 and CPHA =0

Looking at data sheet Fig 94, I think it actually uses SPI_MODE1. 

----------------

[Edit: I missed this before:

>    IE2 |= BIT0;    // Active the serial interruption

Remove this line. You don't have (or need) an ISR, and enabling UCA0RXIE will cause trouble.]

Hi Bruce, I would like to say thanks a lot for your assistance!

I already have change some thinks, as you told me, and I can´t see the VRMS value received from ADE7753. I have included, in the code, a few lines to keep the minimal time value to t9 and t10 according table 2 (page 6). 

I did some experience changes MODE type from 0 to 1, clock frequency (DIV4 or DIV5) and bound rate from 9600 to 115200, but I dint had success!

I did some measurements from oscilloscope the see the signals Clock, CS and MISO (DOUT - ADE7753). As I attached here. I observed in ADE DOUT signal but his wave form don´t sound good. doesn't have an appearance like a wave bit form. yellow line CLOCK SIGNAL and green line ADE DOUT (MISO - MSP430 P1_6).

Please, do you see anything else to change in the code?

 /* ****   MSP430G2553 SPI PIN definitions **
 *  MOSI - P1.7 (Energia Pin 15)
 *  MISO - P1.6  (Energia Pin 14)
 *  SCL/CS  - P2.0 (Energia Pin 8)
 *  SCLK  - P1.5 (Energia Pin 7)
 */
 
//Pin declarations Sensor and correlated at MSP430G2
#define DATAOUT 15//MOSI - 20 DIN - MOD. ADE7753 - VERDE 
#define DATAIN  14//MISO - 19 DOUT - MOD. ADE7753 - AMARELO
#define SPICLOCK  7//sck - 18 - MOD. ADE7753 - LARANJA
#define SLAVESELECT 8// chipSelect - 17 MOD. ADE7753 - AZUL

// transmite um caracter pela interface serial with shift register controller
unsigned char spi_transfer(unsigned char data)
{
    long rcvd_data =0;
    while (!(IFG2&UCB0TXIFG)) /*EMPTY*/;   // Wait for TXBUF to be empty
    UCB0TXBUF = data;     
    while (!(IFG2&UCB0RXIFG)) /*EMPTY*/;  // Wait for RXBUF to be full
    rcvd_data = UCB0RXBUF;
    return(rcvd_data);
    //digitalWrite(SLAVESELECT,HIGH);
}

void setup()
{
    // put your setup code here, to run once:
    Serial.begin(9600);
     // start the SPI library:
    SPI.begin(); /* Initialize SPI */
    SPI.setDataMode(SPI_MODE1); // CPOL =0 and CPHA =0 
    SPI.setClockDivider(4); // the command is to use SPI =  or 4 MHz,DIV4 = 3,91MHZ , DIV5 = 3,13MHZ
    SPI.setBitOrder(LSBFIRST); // I have tested LSB and MSBFirst.
    pinMode(SLAVESELECT, OUTPUT);
    digitalWrite(SLAVESELECT, HIGH);  
    pinMode(DATAOUT, OUTPUT);
    pinMode(DATAIN, INPUT);
    // configuring interruption of the serial interface (reception)
    IFG2 &= ~UCA0RXIFG;   // clear the Serial Interrupt RX flag
    //IFG2 &= ~UCA0TXIFG;   // clear the Serial Interrupt TX flag
    delay(500);
}

long read_ADE7753MEM(int ADE7753_MEM_address, int bytes_to_read)
{
  //Serial.print("Multi-readddr>");
  //Serial.print(EEPROM_address, HEX);
  //Serial.println(" Data starts:");
  long data = 0;
  byte reader_buf = 0;
  //byteRead =0;
  digitalWrite(SLAVESELECT,LOW);
  spi_transfer((char)(ADE7753_MEM_address));      //LSByte Register address
     // here there should be a t9 delay
  delay(68); // to keep t9 - Minimum time between read command considering Clock at 16 Mhz - Min Delay (64)
  for (int i = 0; i < bytes_to_read; i++){
  delay(4); //yo keep t8 - Minimum time between data byte transfers during a multibyte read - Min Delay (0,806)
  reader_buf = spi_transfer(0x00); //get data byte

    data = data|reader_buf;
    if (i< bytes_to_read) {
      data = data<<8;
    }
}
  digitalWrite(SLAVESELECT,HIGH); //release chip, signal end transfer
  return data;
}

void loop()
{
   ADE7753_output_data = read_ADE7753MEM(VRMS,3);
   Serial.println("STATUS VRMS");
   Serial.println(ADE7753_output_data, BIN);
   Serial.println(ADE7753_output_data, HEX);
   delay(1000);
}



CLOCK AND 1ADE7753 DOUT MEASUREMENTs

To keep the clock value DIV4

CLOCK SIGNAL (YELLOW) AND DOUT / MISO_P1_6 GREEN (FROM ADE7753 / MSP430)

The CLK signal looks adequate, but the MISO signal shows signs of bus conflict. If you're using a Launchpad: Did you remove the P1.6 (LED) jumper?

Reading data sheet Fig 94, I'm pretty sure bytes are sent/received MSBFIRST.

I suggest you try reading a register with a known (non-0) value. Maybe MODE (0x09)=0x000C or something.

More generally: This is a 5V device. How are you connecting it to the MSP430 (3.3V)? And how are you providing CLKIN?

Hi Bruce, thanks. I write the answer to your questions bellow:

1. I had remove the P1.6 (led) jumper.

2. I had the same understanding about MSBFIRST.

3. You have a genial idea, I'll do it and let you know soon.

4. I using the 33K resistor to connect DOUT from ADE7753 to MISO from MSP430g2553. I'll buy one LVTTL bidirecional converter to include on my tests.

5. I using 2 capacitors and 1 XTAL connected in the ADE PIN 15 and 16. I have doubts about If is necessary to use PIN 14 (IRQ PIN). 

I have understanding that the IRQ PIn need to connect to access specific registers.

I'll try to make more tests tomorrow!

Thanks a lot for your assistance!

BR,

Alex