jamesmunns
commented
7 years ago Hey @TheZoq2, check out the contents of teensy3-rs-demo/target/thumb.../release/build/teensy3-sys-.../out/bindings.rs. This is where the generated bindings get put.
You'll see something like this:
#[repr(C)]
pub struct TwoWire {
pub _base: Stream,
pub __bindgen_anon_1: TwoWire_I2C_Hardware_t,
pub port: *mut KINETIS_I2C_t,
pub hardware: *const TwoWire_I2C_Hardware_t,
pub rxBuffer: [u8; 32usize],
pub rxBufferIndex: u8,
pub rxBufferLength: u8,
pub txAddress: u8,
pub txBuffer: [u8; 33usize],
pub txBufferIndex: u8,
pub txBufferLength: u8,
pub transmitting: u8,
pub slave_mode: u8,
pub irqcount: u8,
pub sda_pin_index: u8,
pub scl_pin_index: u8,
pub user_onRequest: ::core::option::Option<unsafe extern "C" fn()>,
pub user_onReceive: ::core::option::Option<unsafe extern "C" fn(arg1:
c_types::c_int)>,
}
// ...
impl TwoWire {
#[inline]
pub unsafe fn begin(&mut self) { TwoWire_begin(self) }
#[inline]
pub unsafe fn begin1(&mut self, address: u8) {
TwoWire_begin1(self, address)
}
#[inline]
pub unsafe fn begin2(&mut self, address: c_types::c_int) {
TwoWire_begin2(self, address)
}
// ...
#[inline]
pub unsafe fn new(myport: *mut KINETIS_I2C_t,
myhardware: *const TwoWire_I2C_Hardware_t) -> Self {
let mut __bindgen_tmp = ::core::mem::uninitialized();
TwoWire_TwoWire(&mut __bindgen_tmp, myport, myhardware);
__bindgen_tmp
}
}
Based on this, I think you will need something like this:
unsafe {
// you need to replace the "..." here with something
let mut i = bindings::KINETIS_I2C_t{ ... };
let mut hw = bindings::TwoWire_I2C_Hardware_t{ ... };
// something like this, not 100% sure about the syntax here
let mut x = bindings::TwoWire::new(&mut i, &mut hw);
x.begin();
// ...
}Let me know if this helps.
TheZoq2
patches11
I am trying to use get i2c communication to work but i'm getting a linker error when I use any of the functions.
In the compiled documentation, I have found the struct
teensy3_sys::TwoWirewhich I assume is generated from the arduinoTwoWireclass defined inhardware/teensy/avr/Wireorhardware/arduino/avr/libraries/Wire/I have also found
bindings::Wire,bindings::Wire1andbindings::Wire2. They all have the following type signatureI assume they are the same instances of TwoWire you use in regular arduino code.
Because of this, I assume that the following code should compile and work fine
However, if I add a call to
begin_masterto my main program, I get the following linker error:I also tried
bindings::TwoWire_begin(&mut bindings::Wire1);which gives me the same error.Looking at the arduino source, I don't see why there would be a function called
begin, if anythign it should beTwoWire::begin. I also don't see bindings for the internal c code that TwoWire wraps aroundlibraries/Wire/src/utility/twi.c.This is when trying to compile for teensy3.5, I have not tried 3.2