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lib.rs
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//! BL602 Rust Scripting Library
#![feature(libc)] // Allow C Standard Library, which will be mapped by emscripten to JavaScript
extern crate alloc;
extern crate wee_alloc;
// Use `wee_alloc` as the global allocator
#[global_allocator]
static ALLOC: wee_alloc::WeeAlloc = wee_alloc::WeeAlloc::INIT;
// Import Libraries
use rhai::{ // Rhai Scripting Engine
Engine,
plugin::*,
};
/// This function will be called by WebAssembly to run a script
#[no_mangle] // Don't mangle the function name
extern "C" fn rust_script( // Declare `extern "C"` because it will be called by BL602 firmware
_result: *mut u8, // Result to be returned to command-line interface (char *)
_len: i32, // Size of result buffer (int)
_argc: i32, // Number of command line args (int)
_argv: *const *const u8 // Array of command line args (char **)
) {
// Show a message on the serial console
println!("Hello from Rust Script!");
// Init the Rhai script engine
let mut engine = Engine::new();
println!("Created script engine");
// Create a Rhai module from the plugin module
let module = exported_module!(gpio);
// Register our module as a Static Module
engine.register_static_module("gpio", module.into());
// Register our functions with Rhai
engine.register_fn("time_delay", time_delay);
// Rhai Script to be evaluated
let script = r#"
// Blink the LED:
// PineCone Blue LED is connected on BL602 GPIO 11
let LED_GPIO = 11;
// Configure the LED GPIO for output (instead of input)
gpio::enable_output(LED_GPIO, 0, 0);
// Blink the LED 5 times
for i in range(0, 10) {
// Toggle the LED GPIO between 0 (on) and 1 (off)
gpio::output_set(
LED_GPIO,
i % 2
);
// Sleep 1 second
time_delay(1000);
}
// Evaluate an expression
let a = 40;
let b = 2;
a + b
"#;
// Compile Rhai Script to an Abstract Syntax Tree
let ast = engine.compile(script)
.unwrap();
println!("AST: {:#?}", ast);
// Evaluate the compiled Rhai Script
let result: i32 = engine.eval_ast(&ast)
.unwrap();
println!("Eval OK");
// Alternatively: Evaluate a Rhai Script
// let result = engine.eval::<i32>(script).unwrap() as isize;
// Display the result
println!("Result of Rhai Script: {}", result);
}
/// GPIO Module will be exported to Rhai as a Static Module
#[export_module]
mod gpio {
/// Rhai Shim for Enable GPIO Output
/// TODO: Modified parameters from u8 to i32
pub fn enable_output(pin: i32, pullup: i32, pulldown: i32) {
println!("gpio::enable_output: pin={}, pullup={}, pulldown={}", pin, pullup, pulldown);
"----------Extern Decl----------";
extern "C" {
pub fn bl_gpio_enable_output(pin: u8, pullup: u8, pulldown: u8)
-> c_int;
}
"----------Validation----------";
unsafe {
"----------Call----------";
let _res =
bl_gpio_enable_output(pin as u8, pullup as u8,
pulldown as u8);
"----------Result----------";
// TODO: Throw exception in case of error
// match res { 0 => Ok(()), _ => Err(BlError::from(res)), }
}
}
/// Rhai Shim for Set GPIO Output
/// TODO: Modified parameters from u8 to i32
pub fn output_set(pin: i32, value: i32) {
println!("gpio::output_set: pin={}, value={}", pin, value);
"----------Extern Decl----------";
extern "C" {
pub fn bl_gpio_output_set(pin: u8, value: u8)
-> c_int;
}
"----------Validation----------";
unsafe {
"----------Call----------";
let _res = bl_gpio_output_set(pin as u8, value as u8);
"----------Result----------";
// TODO: Throw exception in case of error
// match res { 0 => Ok(()), _ => Err(BlError::from(res)), }
}
}
}
/// Rhai Shim for Time Delay
/// TODO: Modified parameter from u32 to i32
pub fn time_delay(
ticks: i32 // Number of ticks to sleep
) {
println!("time_delay: {}", ticks);
extern "C" { // Import C Function
/// Sleep for the specified number of system ticks (from NimBLE Porting Layer)
fn ble_npl_time_delay(ticks: u32);
}
// Call the C function
unsafe { // Flag this code as unsafe because we're calling a C function
ble_npl_time_delay(ticks as u32);
}
}
// TODO: Fix `emscripten_get_now`
#[no_mangle] // Don't mangle the function name
extern "C" fn _emscripten_get_now() -> f64 { 0.0 }
/// Return type for BL602 IoT SDK
#[allow(non_camel_case_types)]
type c_int = i32;
/* Output Log:
Execute: rust_script
Hello from Rust Script!
Created script engine
AST: AST {
source: None,
body: Block[
Var(
11 @ 4:24,
"LED_GPIO" @ 4:13,
(),
4:9,
),
FnCall(
FnCallExpr {
namespace: Some(
gpio,
),
hashes: 14026165341011925297,
args: [
Variable(LED_GPIO #1) @ 7:29,
StackSlot(0) @ 7:39,
StackSlot(1) @ 7:42,
],
constants: [
0,
0,
],
name: "enable_output",
capture: false,
},
7:15,
),
For(
FnCall {
name: "range",
hash: 6483209994621034098,
args: [
StackSlot(0) @ 10:24,
StackSlot(1) @ 10:27,
],
constants: [
0,
10,
],
} @ 10:18,
(
"i" @ 10:13,
None,
Block[
FnCall(
FnCallExpr {
namespace: Some(
gpio,
),
hashes: 14851760529339133429,
args: [
Variable(LED_GPIO #2) @ 14:17,
FnCall {
name: "%",
hash: 16068100750815511651 (native only),
args: [
Variable(i #1) @ 15:17,
StackSlot(0) @ 15:21,
],
constants: [
2,
],
} @ 15:19,
],
constants: [],
name: "output_set",
capture: false,
},
13:19,
),
FnCall(
FnCallExpr {
namespace: None,
hashes: 5888125028643394501,
args: [
StackSlot(0) @ 19:24,
],
constants: [
1000,
],
name: "time_delay",
capture: false,
},
19:13,
),
] @ 10:31,
),
10:9,
),
Var(
40 @ 23:17,
"a" @ 23:13,
(),
23:9,
),
Var(
2 @ 24:17,
"b" @ 24:13,
(),
24:9,
),
FnCall(
FnCallExpr {
namespace: None,
hashes: 45565345930656002 (native only),
args: [
Variable(a #2) @ 25:9,
Variable(b #1) @ 25:13,
],
constants: [],
name: "+",
capture: false,
},
25:11,
),
],
functions: Module,
resolver: None,
}
gpio::enable_output: pin=11, pullup=0, pulldown=0
gpio::output_set: pin=11, value=0
time_delay: 1000
gpio::output_set: pin=11, value=1
time_delay: 1000
gpio::output_set: pin=11, value=0
time_delay: 1000
gpio::output_set: pin=11, value=1
time_delay: 1000
gpio::output_set: pin=11, value=0
time_delay: 1000
gpio::output_set: pin=11, value=1
time_delay: 1000
gpio::output_set: pin=11, value=0
time_delay: 1000
gpio::output_set: pin=11, value=1
time_delay: 1000
gpio::output_set: pin=11, value=0
time_delay: 1000
gpio::output_set: pin=11, value=1
time_delay: 1000
Eval OK
Result of Rhai Script: 42
get_simulation_events: [{"gpio_output_set":{"pin":11,"value":0}},{"time_delay":{"ticks":1000}},{"gpio_output_set":{"pin":11,"value":1}},{"time_delay":{"ticks":1000}},{"gpio_output_set":{"pin":11,"value":0}},{"time_delay":{"ticks":1000}},{"gpio_output_set":{"pin":11,"value":1}},{"time_delay":{"ticks":1000}},{"gpio_output_set":{"pin":11,"value":0}},{"time_delay":{"ticks":1000}},{"gpio_output_set":{"pin":11,"value":1}},{"time_delay":{"ticks":1000}},{"gpio_output_set":{"pin":11,"value":0}},{"time_delay":{"ticks":1000}},{"gpio_output_set":{"pin":11,"value":1}},{"time_delay":{"ticks":1000}},{"gpio_output_set":{"pin":11,"value":0}},{"time_delay":{"ticks":1000}},{"gpio_output_set":{"pin":11,"value":1}},{"time_delay":{"ticks":1000}}]
Events: [
{
"gpio_output_set": {
"pin": 11,
"value": 0
}
},
{
"time_delay": {
"ticks": 1000
}
},
{
"gpio_output_set": {
"pin": 11,
"value": 1
}
},
{
"time_delay": {
"ticks": 1000
}
},
{
"gpio_output_set": {
"pin": 11,
"value": 0
}
},
{
"time_delay": {
"ticks": 1000
}
},
{
"gpio_output_set": {
"pin": 11,
"value": 1
}
},
{
"time_delay": {
"ticks": 1000
}
},
{
"gpio_output_set": {
"pin": 11,
"value": 0
}
},
{
"time_delay": {
"ticks": 1000
}
},
{
"gpio_output_set": {
"pin": 11,
"value": 1
}
},
{
"time_delay": {
"ticks": 1000
}
},
{
"gpio_output_set": {
"pin": 11,
"value": 0
}
},
{
"time_delay": {
"ticks": 1000
}
},
{
"gpio_output_set": {
"pin": 11,
"value": 1
}
},
{
"time_delay": {
"ticks": 1000
}
},
{
"gpio_output_set": {
"pin": 11,
"value": 0
}
},
{
"time_delay": {
"ticks": 1000
}
},
{
"gpio_output_set": {
"pin": 11,
"value": 1
}
},
{
"time_delay": {
"ticks": 1000
}
}
]
*/