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2. Devices & Examples
3. M5Unified
4. M5GFX
5. Extensions
Unit
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IoT
Accessories
Stamp C6LoRa EXT IO
Stamp C6LoRa integrates the PI4IOE5V6408 IO expansion chip internally. In addition to controlling the LoRa module's transceiver circuit and signal amplifier enable, it also exposes the EXT_P0 ~ P4 interfaces to provide additional IO resources.
Example Code
Compilation Requirements
- M5Stack Board Manager version >= 3.2.6
- Board Option = M5StampC6LoRa
- M5Unified library version >= 0.2.13
- M5GFX library version >= 0.2.19
Output
cpp
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#include <Arduino.h>
#include <M5Unified.h>
#include "utility/PI4IOE5V6408_Class.hpp"
m5::I2C_Class i2c_bus_0;
m5::PI4IOE5V6408_Class ioe(0x43, 400000, &i2c_bus_0);
void setup()
{
Serial.begin(115200);
delay(300);
Serial.println("PI4IOE5V6408 Output Example");
if (!i2c_bus_0.begin(I2C_NUM_0, 10, 8)) {
Serial.println("I2C init failed");
while (true) delay(1000);
}
if (!ioe.begin()) {
Serial.println("IOE init failed");
while (true) delay(1000);
}
for (int i = 0; i < 5; i++) {
ioe.setDirection(i, true); // output
ioe.setHighImpedance(i, false); // disable high-impedance so pin can actually drive
ioe.digitalWrite(i, false); // default low
}
}
void loop()
{
static bool state = false;
state = !state;
for (int i = 0; i < 5; i++) {
ioe.digitalWrite(i, state);
Serial.printf("[EXT_P%d] %d ", i, (int)state);
}
Serial.println();
delay(1000);
}
Input
cpp
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#include <Arduino.h>
#include <M5Unified.h>
#include "utility/PI4IOE5V6408_Class.hpp"
m5::I2C_Class i2c_bus_0;
m5::PI4IOE5V6408_Class ioe(0x43, 400000, &i2c_bus_0);
void setup()
{
Serial.begin(115200);
delay(300);
Serial.println("PI4IOE5V6408 Input Example");
if (!i2c_bus_0.begin(I2C_NUM_0, 10, 8)) {
Serial.println("I2C init failed");
while (true) delay(1000);
}
if (!ioe.begin()) {
Serial.println("IOE init failed");
while (true) delay(1000);
}
for (int i = 0; i < 5; i++) {
ioe.setDirection(i, false); // input
ioe.enablePull(i, true); // enable internal pull resistor
ioe.setPullMode(i, true); // pull-up (true=up, false=down)
}
}
void loop()
{
for (int i = 0; i < 5; i++) {
Serial.printf("[EXT_P%d] %d ", i, (int)ioe.digitalRead(i));
}
Serial.println();
delay(1000);
}