O objetivo deste BLOG é demonstrar como é possível programar o módulo WISOL LSM110A via ARDUINO e assim utilizá-lo como OPENCPU.
BETA BETA BETA BETA
Será testado o exemplo LoRa_P2P de jgromes/RadioLib: Universal wireless communication library for embedded devices (github.com) que permite fazer a comunicação P2P entre 2 LSM110A, na frequência de 868000000.
A tecnologia LoRa® permite estabelecer comunicação diretamente entre dois dispositivos, dispensando o gateway. Com um pouco de esforço de desenvolvimento, é possível implementar uma rede de comunicação. Essa arquitetura é comumente chamada no mercado de peer-to-peer ou P2P.
LSM110A Starter KIT
Módulo
O LSM110A é um módulo de última geração que integra o STMicroelectronics STM32WL. É muito menos consumo atual para o dispositivo IoT para estender a vida útil da bateria. E, também suporta ambas as tecnologias – Sigfox e LoRa – com o próprio módulo LSM110A.
Você pode trocar Sigfox ou LoRa com ele para que você também possa reduzir o custo. É altamente otimizado para solução de IoT (Alto Consumo de Energia, Baixo Custo)
BREAKOUT para testes
Esquema Elétrico - últimas correções
PLACA MONTADA
CONEXÃO COM ST-LINK V2 E UART
ARDUINO
O que é Arduino? Se você sabe pouco sobre Arduino, por favor dê uma olhada abaixo:
Você conhece Arduino. Instale o IDE primeiro:
https://www.arduino.cc/en/Main/Software
Você conhece Arduino. Instale o IDE primeiro:
https://www.arduino.cc/en/Main/Software
LSM110A e Arduino (STM32DUINO)
LSM110A é baseado em STM32WL55. No Arduino STM32 existe este core.
Como instalar Arduino STM32? adicionar em Arquivo-->Preferências-->URLs adicionais
https://github.com/stm32duino/BoardManagerFiles/raw/main/package_stmicroelectronics_index.json
2.4.0
Adicione ao Arduino IDE:
Pronto
Altere Placa para STM32WL series
Baixe a LIB RadioLib e instale no Arduino
Deve-se gravar 2 LSM110A para que haja a comunicação P2P. Um pacote "payload" será transmitido entre eles.
STM32 CUBE
Segue código - STM32WLx_Transmit_Interrupt.ino
/*
RadioLib STM32WLx Transmit with Interrupts Example
This example transmits LoRa packets with one second delays
between them. Each packet contains up to 256 bytes
of data, in the form of:
- Arduino String
- null-terminated char array (C-string)
- arbitrary binary data (byte array)
For default module settings, see the wiki page
https://github.com/jgromes/RadioLib/wiki/Default-configuration#sx126x---lora-modem
For full API reference, see the GitHub Pages
https://jgromes.github.io/RadioLib/
*/
// include the library
#include <RadioLib.h>
// no need to configure pins, signals are routed to the radio internally
STM32WLx radio = new STM32WLx_Module();
// set RF switch configuration for Nucleo WL55JC1
// NOTE: other boards may be different!
static const uint32_t rfswitch_pins[] =
{PC3, PC4, PC5};
static const Module::RfSwitchMode_t rfswitch_table[] = {
{STM32WLx::MODE_IDLE, {LOW, LOW, LOW}},
{STM32WLx::MODE_RX, {HIGH, HIGH, LOW}},
{STM32WLx::MODE_TX_LP, {HIGH, HIGH, HIGH}},
{STM32WLx::MODE_TX_HP, {HIGH, LOW, HIGH}},
END_OF_MODE_TABLE,
};
// save transmission state between loops
int transmissionState = RADIOLIB_ERR_NONE;
void setup() {
Serial.begin(9600);
// set RF switch control configuration
// this has to be done prior to calling begin()
radio.setRfSwitchTable(rfswitch_pins, rfswitch_table);
// initialize STM32WL with default settings, except frequency
Serial.print(F("[STM32WL] Initializing ... "));
int state = radio.begin(868.0);
if (state == RADIOLIB_ERR_NONE) {
Serial.println(F("success!"));
} else {
Serial.print(F("failed, code "));
Serial.println(state);
while (true);
}
// set appropriate TCXO voltage for Nucleo WL55JC1
state = radio.setTCXO(1.7);
if (state == RADIOLIB_ERR_NONE) {
Serial.println(F("success!"));
} else {
Serial.print(F("failed, code "));
Serial.println(state);
while (true);
}
// set the function that will be called
// when packet transmission is finished
radio.setDio1Action(setFlag);
// start transmitting the first packet
Serial.print(F("[STM32WL] Sending first packet ... "));
// you can transmit C-string or Arduino string up to
// 256 characters long
transmissionState = radio.startTransmit("Hello World!");
// you can also transmit byte array up to 256 bytes long
/*
byte byteArr[] = {0x01, 0x23, 0x45, 0x67,
0x89, 0xAB, 0xCD, 0xEF};
state = radio.startTransmit(byteArr, 8);
*/
}
// flag to indicate that a packet was sent
volatile bool transmittedFlag = false;
// this function is called when a complete packet
// is transmitted by the module
// IMPORTANT: this function MUST be 'void' type
// and MUST NOT have any arguments!
void setFlag(void) {
// we sent a packet, set the flag
transmittedFlag = true;
}
void loop() {
// check if the previous transmission finished
if(transmittedFlag) {
// reset flag
transmittedFlag = false;
if (transmissionState == RADIOLIB_ERR_NONE) {
// packet was successfully sent
Serial.println(F("transmission finished!"));
// NOTE: when using interrupt-driven transmit method,
// it is not possible to automatically measure
// transmission data rate using getDataRate()
} else {
Serial.print(F("failed, code "));
Serial.println(transmissionState);
}
// clean up after transmission is finished
// this will ensure transmitter is disabled,
// RF switch is powered down etc.
radio.finishTransmit();
// wait a second before transmitting again
delay(1000);
// send another one
Serial.print(F("[STM32WL] Sending another packet ... "));
// you can transmit C-string or Arduino string up to
// 256 characters long
transmissionState = radio.startTransmit("Hello World!");
// you can also transmit byte array up to 256 bytes long
/*
byte byteArr[] = {0x01, 0x23, 0x45, 0x67,
0x89, 0xAB, 0xCD, 0xEF};
int state = radio.startTransmit(byteArr, 8);
*/
}
}
Segue código final - STM32WLx_Receive_Interrupt.ino
/*
RadioLib STM32WLx Receive with Interrupts Example
This example listens for LoRa transmissions and tries to
receive them. Once a packet is received, an interrupt is
triggered. To successfully receive data, the following
settings have to be the same on both transmitter
and receiver:
- carrier frequency
- bandwidth
- spreading factor
- coding rate
- sync word
This example assumes Nucleo WL55JC1 is used. For other Nucleo boards
or standalone STM32WL, some configuration such as TCXO voltage and
RF switch control may have to be adjusted.
For default module settings, see the wiki page
https://github.com/jgromes/RadioLib/wiki/Default-configuration#sx126x---lora-modem
For full API reference, see the GitHub Pages
https://jgromes.github.io/RadioLib/
*/
// include the library
#include <RadioLib.h>
// no need to configure pins, signals are routed to the radio internally
STM32WLx radio = new STM32WLx_Module();
void setup() {
Serial.begin(9600);
// set RF switch control configuration
// this has to be done prior to calling begin()
radio.setRfSwitchTable(rfswitch_pins, rfswitch_table);
// initialize STM32WL with default settings, except frequency
Serial.print(F("[STM32WL] Initializing ... "));
int state = radio.begin(868.0);
if (state == RADIOLIB_ERR_NONE) {
Serial.println(F("success!"));
} else {
Serial.print(F("failed, code "));
Serial.println(state);
while (true);
}
// set appropriate TCXO voltage for Nucleo WL55JC1
state = radio.setTCXO(1.7);
if (state == RADIOLIB_ERR_NONE) {
Serial.println(F("success!"));
} else {
Serial.print(F("failed, code "));
Serial.println(state);
while (true);
}
// set the function that will be called
// when new packet is received
radio.setDio1Action(setFlag);
// start listening for LoRa packets
Serial.print(F("[STM32WL] Starting to listen ... "));
state = radio.startReceive();
if (state == RADIOLIB_ERR_NONE) {
Serial.println(F("success!"));
} else {
Serial.print(F("failed, code "));
Serial.println(state);
while (true);
}
// if needed, 'listen' mode can be disabled by calling
// any of the following methods:
//
// radio.standby()
// radio.sleep()
// radio.transmit();
// radio.receive();
// radio.readData();
// radio.scanChannel();
}
// flag to indicate that a packet was received
volatile bool receivedFlag = false;
// this function is called when a complete packet
// is received by the module
// IMPORTANT: this function MUST be 'void' type
// and MUST NOT have any arguments!
void setFlag(void) {
// we got a packet, set the flag
receivedFlag = true;
}
void loop() {
// check if the flag is set
if(receivedFlag) {
// reset flag
receivedFlag = false;
// you can read received data as an Arduino String
String str;
int state = radio.readData(str);
// you can also read received data as byte array
/*
byte byteArr[8];
int state = radio.readData(byteArr, 8);
*/
if (state == RADIOLIB_ERR_NONE) {
// packet was successfully received
Serial.println(F("[STM32WL] Received packet!"));
// print data of the packet
Serial.print(F("[STM32WL] Data:\t\t"));
Serial.println(str);
// print RSSI (Received Signal Strength Indicator)
Serial.print(F("[STM32WL] RSSI:\t\t"));
Serial.print(radio.getRSSI());
Serial.println(F(" dBm"));
// print SNR (Signal-to-Noise Ratio)
Serial.print(F("[STM32WL] SNR:\t\t"));
Serial.print(radio.getSNR());
Serial.println(F(" dB"));
} else if (state == RADIOLIB_ERR_CRC_MISMATCH) {
// packet was received, but is malformed
Serial.println(F("CRC error!"));
} else {
// some other error occurred
Serial.print(F("failed, code "));
Serial.println(state);
}
// put module back to listen mode
radio.startReceive();
}
}
// set RF switch configuration for Nucleo WL55JC1
// NOTE: other boards may be different!
static const uint32_t rfswitch_pins[] =
{PB12, PC13, PC5}; //PC5 NOT USED
static const Module::RfSwitchMode_t rfswitch_table[] = {
{STM32WLx::MODE_IDLE, {LOW, LOW, LOW}}, //THIRD COLUMM NOT USED
{STM32WLx::MODE_RX, {HIGH, LOW, LOW}}, //THIRD COLUMM NOT USED
{STM32WLx::MODE_TX_LP, {HIGH, HIGH, HIGH}}, //THIRD COLUMM NOT USED
{STM32WLx::MODE_TX_HP, {HIGH, HIGH, HIGH}}, //THIRD COLUMM NOT USED
END_OF_MODE_TABLE,
};
Execução - Receive
Execução - Transmit
Montagem
Fontes:
Dúvidas
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