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JavaScript: Add I2C support (#259)

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* JavaScript: Add I2C support

* Format

* Check input bytes, allow arraybuf write input

* Add comment

* Return arraybuf, remove unnecessary malloc and memset

* More meaningful var names for code readability, fix some bugs

* Remove unnecessary state

* Fix build

* Update changelog

* Add typedefs

* toString() updates in example script

---------

Co-authored-by: Willy-JL <49810075+Willy-JL@users.noreply.github.com>
This commit is contained in:
Derek Jamison
2024-10-19 23:24:44 -06:00
committed by GitHub
parent abd3add64e
commit e682b6b19e
5 changed files with 369 additions and 0 deletions
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48
applications/system/js_app/examples/apps/Scripts/Examples/i2c.js Normal file
View File

@@ -0,0 +1,48 @@
// Connect an 24C32N EEPROM to the I2C bus of the board. SDA=pin 15, SCL=pin 16, VCC=pin 9, GND=pin 8.
let i2c = require("i2c");
function i2c_find_first_device() {
let addr = -1;
for (let try_addr = 0; try_addr !== 0xff; try_addr++) {
if (i2c.isDeviceReady(try_addr, 5)) {
addr = try_addr;
break;
}
}
return addr;
}
let addr = i2c_find_first_device();
if (addr === -1) {
print("I2C device not found");
print("Please connect a 24C32N EEPROM I2C device to the Flipper Zero.");
print("SDA=pin 15, SCL=pin 16, VCC=pin 9, GND=pin 8.");
} else {
print("I2C device found at address: " + addr.toString(16));
delay(1000);
// first two bytes are the start address (0x0000)
// the remaining bytes are the data to store.
// can also use Uint8Array([0x00, 0x00, ...]) as write parameter
i2c.write(addr, [0x00, 0x00, 0x41, 0x42, 0x43, 0x44, 0x45, 0x46, 0x47]);
while (i2c.isDeviceReady(addr, 9) === false) {
print("Waiting for device to be ready...");
}
// write the address to read from (we start at address 0x0001)
// read 3 bytes - 0x42, 0x43, 0x44
let data_buf = i2c.writeRead(addr, [0x00, 0x01], 3, 100);
let data = Uint8Array(data_buf);
print("Read bytes: " + data.length.toString());
for (let i = 0; i < data.length; i++) {
print("data[" + i.toString() + "] = " + data[i].toString(16));
}
// read two more bytes (0x45, 0x46) from current address
data_buf = i2c.read(addr, 2);
data = Uint8Array(data_buf);
print("Read bytes: " + data.length.toString());
for (let i = 0; i < data.length; i++) {
print("data[" + i.toString() + "] = " + data[i].toString(16));
}
}