AFE_NXP_Arduino 2.0.2 Analog Front-End (AFE) device operation sample code for Arduino

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AFE_NXP_Arduino

Analog Front End device operation sample code for Arduino

# What is this?

An Arduino library for NXP Analog Front End device with sample code.
This library provides simple API to get analog input channels.
Include device name header file (NAFE13388_UIM.h or NAFE33352_UIOM.h) to use those class libraries.

This repo shoiws some basic operations of NAFE13388_UIM as well as practical samples to work with RTD, thermocouple and loadcell.

# Easy to use

3 types of Arduino UNO boards: R3, R4 Minima and R4 WiFi are supported.

> Note
> For any type of Arduino board and NAFE13388-UIM/NAFE33352-UIOM board connection, DON'T PLUG ARDUINO SHIELD SOCKET DIRECTLY!!
> The 3.3V supply pin should be disconected to protect Arduino suppy circuit.
> Please refer to pictures in later in this page.

Example sketches can be built and run on any of those boards.

## Simple example code for NAFE13388-UIM

Next is a sample of the basic operation of NAFE13388-UIM measureing analog voltage on AI1P and AI1N terminal.

#include <NAFE13388_UIM.h>
NAFE13388_UIM afe; // make an instance of NAFE13388_UIM
void setup() {
// serial channel (between PC and Arduino) setup
Serial.begin(115200);
while (!Serial)
;
Serial.println("\n***** Hello, NAFE13388! *****");
// SPI bus setup
SPI.begin();
pinMode(SS, OUTPUT); // Required for UNO R4
// AFE reset and check connection
afe.begin();
afe.blink_leds();
// ADC logical chennel setup
afe.logical_channel[0].configure(0x1710, 0x00A4, 0xBC00, 0x0000);
afe.logical_channel[1].configure(0x2710, 0x00A4, 0xBC00, 0x0000);
Serial.println("\nlogical channel 0 (AI1P-AICOM) and 1 (AI2P-AICOM) voltages are shown in ADC readout value [V]");
// To use DRDY signal to detect AD conversion done
afe.use_DRDY_trigger(true);
}
void loop() {
// Show ADC read value on volt
Serial.print((NAFE13388_UIM::volt_t)afe.logical_channel[0]);
Serial.print(", ");
Serial.println((NAFE13388_UIM::volt_t)afe.logical_channel[1]);
}
NAFE13388_UIM.h
AFE_base::volt_t
double volt_t
Definition AFE_NXP.h:23
AFE_base::use_DRDY_trigger
void use_DRDY_trigger(bool use=true)
Definition AFE_NXP.cpp:191
AFE_base::begin
virtual void begin(void)
Definition AFE_NXP.cpp:98
NAFE13388_Base::LogicalChannel::configure
void configure(const uint16_t(&cc)[4])
Definition AFE_NXP.cpp:56
NAFE13388_Base::logical_channel
LogicalChannel logical_channel[16]
Definition AFE_NXP.h:344
NAFE13388_UIM
Definition AFE_NXP.h:737
NAFE13388_UIM::blink_leds
void blink_leds(void)
Definition AFE_NXP.cpp:635

To try this sample code, set jumper plug on J91 to short AICOM and GND.
The analog input terminals are available as picture below.

## Simple example code for NAFE33352-UIOM

Next is a sample of the basic operation of NAFE33352-UIOM measureing analog voltage beween AI1P and VCM with DAC working to output voltage or current.

#include <NAFE33352_UIOM.h>
NAFE33352_UIOM shasta; // make an instance of NAFE33352_UIOM
#define VOLTAGE_OUTPUT_SETTING // demo type selector: comment-out to select current output
double output_value;
int count = 0;
void setup() {
// serial channel (between PC and Arduino) setup
Serial.begin(115200);
while (!Serial)
;
Serial.println("\n***** Hello, NAFE33352_UIOM! *****");
// SPI bus setup
SPI.begin();
pinMode(SS, OUTPUT); // Required for UNO R4
// AFE reset and check connection
shasta.begin();
#ifdef VOLTAGE_OUTPUT_SETTING
// DAC setup: configure to voltage output
output_value = 5.00; // 5V
shasta.dac.configure(NAFE33352_UIOM::DAC::ModeSelect::VOLTAGE);
#else
// DAC setup: configure to current output
output_value = 20 * 1e-3; // 20mA
shasta.dac.configure(NAFE33352_UIOM::DAC::ModeSelect::CURRENT);
#endif
// Set DAC output
shasta.dac = output_value;
delay( 100 );
// ADC logical chennel setup
shasta.logical_channel[0].configure(0x0020, 0x50B4, 0x5000); // voltage between AI1P - VCOM
shasta.logical_channel[1].configure(0x0080, 0x5064, 0x5000); // supply monitoring: VHDD
shasta.logical_channel[2].configure(0x0088, 0x5064, 0x5000); // supply monitoring: VHSS
shasta.logical_channel[3].configure(0x0038, 0x2064, 0x5000); // VSNS voltage
shasta.logical_channel[4].configure(0x0030, 0x3064, 0x5000); // ISNS current
}
void loop() {
double data;
// show ADC measured data (in volt and ampere)
for (auto i = 0; i < shasta.enabled_logical_channels(); i++) {
data = shasta.logical_channel[i];
Serial.print(data, 9);
Serial.print(", ");
}
// show AIO_STATUS register value
Serial.println(shasta.reg(NAFE33352_UIOM::Register16::AIO_STATUS), HEX);
// alternate DAC output polarity
shasta.dac = output_value * (count++ & 0x1 ? +1.00 : -1.00);
delay(1000);
}
NAFE33352_UIOM.h
AFE_base::enabled_logical_channels
int enabled_logical_channels(void)
Definition AFE_NXP.h:203
NAFE33352_Base::DAC::configure
void configure(const uint16_t(&cc)[6])
Definition NAFE33352.cpp:48
NAFE33352_Base::LogicalChannel::configure
void configure(const uint16_t(&cc)[3])
Definition NAFE33352.cpp:22
NAFE33352_Base::Register16::AIO_STATUS
@ AIO_STATUS
Definition NAFE33352.h:292
NAFE33352_Base::dac
DAC dac
Definition NAFE33352.h:143
NAFE33352_Base::logical_channel
LogicalChannel logical_channel[16]
Definition NAFE33352.h:74
NAFE33352_Base::reg
virtual void reg(Register16 r, uint16_t value)
Definition NAFE33352.cpp:434
NAFE33352_UIOM
Definition NAFE33352.h:483

## Board connections

Followings are pictures of UIM with UNO R3, UNO R4 Minima and UNO R4 WiFi boards.
On every picture, showing the hardware setting of..

- 3.3V are disconnected by using pin extender
- A jumper plug is set on J91
- D2 and D4 pins are shorted to enable to use DRDY signal

NAFE13388-UIM 8 Channels Universal Input AFE Evaluation Board with Arduino UNO R3

NAFE13388-UIM 8 Channels Universal Input AFE Evaluation Board with Arduino UNO R4 Minima

NAFE13388-UIM 8 Channels Universal Input AFE Evaluation Board with Arduino UNO R4 WiFi

> Note
> For proper voltage signal interfacing, connection between Arduino MCU board and NAFE13388-UIM board need to be modified. Remove 3.3V supply pin to let UIM to support 5V signaling.
> 3.3V supply pin is lifted at pin extender

> Diagram of 3.3V and 5V supply rails on NAFE13388-UIM board's schematic

> Using 5V supply on IOREF pin from Arduino board_

NAFExx388-EVB 8 Channels Universal Input AFE Evaluation Board with Arduino UNO R3

Analog-Front-End chip: NAFE13388

# Supported device

Type# | Features | Interface
--- | --- | ---
NAFE13388 | Highly Configurable 8 Channel ±25 V Universal Input Low Power Analog Front-End | SPI (mode1)
NAFE73388 | Highly Configurable 8 Channel ±25 V Universal Input Low Power Analog Front-End | SPI (mode1)
NAFE33352 | Software Configurable Input and Output Analog Front End | SPI (mode1)
NAFE93352 | Software Configurable Input and Output Analog Front End | SPI (mode1)

# Evaluation boards

Name | Header file | Features | Interface | Evaluation board
--- | --- | --- | --- | ---
NAFExx388-EVB | NAFE13388.h | General purpose evaluation board for NAFE13388 | SPI (mode1) | NAFE13388-UIM 8-Channel Universal Input AFE Arduino® Shield Board
NAFE13388-UIM | NAFE13388_UIM.h | AFE Arduino shield type evaluation board | SPI (mode1) | NAFE13388-UIM 8-Channel Universal Input AFE Arduino® Shield Board
NAFE33352-EVB | NAFE13388_UIM.h | AFE Arduino shield type evaluation board | SPI (mode1) | Software Configurable Universal AIO-AFE Evaluation Board
[NAFE33352-UIOM]() | NAFE13388_UIM.h | AFE Arduino shield type evaluation board | SPI (mode1) | [NAFE33352-UIOM Universal Input/OUTPUT AFE Arduino® Shield Board]()

# Getting started

How to setup? --> https://youtu.be/UEOFC0TwA6c

# What's inside?

## Examples

Examples are provided as scketch files.

### How to use?

After library install, Choose menu on Arduino-IDE: File→Examples→AFE_NXP_Arduino→ sketch for your try

### List of sample code

#### examples for NAFE13388

Sketch|Target|Feature|NOTE —|—|—|— NAFE13388_1_0_simple_SCSR|NAFE13388-UIM |**Simple** sample to get 2ch inputs| NAFE13388_1_1_simple_SCSR_using_DRDY_signal|NAFE13388-UIM |**Simple** sample to get 2ch inputs using DRDY signal|Need to short pins between D2 and D4 NAFE13388_2_0_multichannel_read_MCMR|NAFE13388-UIM |Get 8ch inputs using Multi-Channel Multi-Read command| NAFE13388_2_1_multichannel_read_MCMR_using_DRDY|NAFE13388-UIM |Get 8ch inputs using Multi-Channel Multi-Read command| Need to short pins between D2 and D4 NAFE13388_3_0_multichannel_read_MCCR_using_DRDY|NAFE13388-UIM |Get 8ch inputs using Multi-Channel Continuous-Read command| Need to short pins between D2 and D4 NAFE13388_4_0_LVMUX_multichannel_read_MCCR_using_DRDY|NAFE13388-UIM |Get 8ch inputs and LVMUX inputs (supply voltage, etc)|Need to short pins between D2 and D4 NAFE13388_5_0_RTD_4_wire|NAFE13388-UIM |Practical sample to measure temperature by 2 RTDs using internal current excitation source|Need to short pins between D2 and D4 NAFE13388_6_0_Thermocouple|NAFE13388-UIM |Practical sample to measure temperature by thermocouple with on-board RTD |Need to short pins between D2 and D4 NAFE13388_7_0_LoadCell|NAFE13388-UIM |Practical sample to measure loadcell output using internal voltage excitation source |Need to short pins between D2 and D4

#### examples for NAFE33352

Sketch | Target | Feature | NOTE
--- | --- | --- | ---
NAFE33352_1_0_ADC_and_DAC | NAFE33352-UIOM | A sample of ADC and DAC operation | Need to short pins between D2 and D4
NAFE33352_2_0_AIO_input | NAFE33352-UIOM | A sample of AIO (Analog Input/Output) channel used as an input | Need to short pins between D2 and D4

# Document

For details of the library, please find descriptions in this document.