I2C: fixed example and added reset for blocking

CHANGELOG.md

@@ -45,6 +45,7 @@ and this project adheres to [Semantic Versioning](http://semver.org/).
 
 ### Added
 
+- reset methods for I2C and BlockingI2C interfaces
 - `Serial` support for UART4/5
 - Allow to set HSE bypass bit in `RCC` clock configuration register to use an external clock input on the `OSC_IN` pin [#485]
 - initial support of `embedded-hal-1.0` [#416]

examples/i2c-bme280/src/main.rs

@@ -24,7 +24,7 @@ use panic_semihosting as _;
 use bme280::i2c::BME280;
 use cortex_m_rt::entry;
 use stm32f1xx_hal::{
-    i2c::{BlockingI2c, DutyCycle, Mode},
+    i2c::{DutyCycle, I2cExt, Mode},
     pac,
     prelude::*,
     rcc,
@@ -54,33 +54,34 @@ fn main() -> ! {
         &mut flash.acr,
     );
 
-    let mut afio = dp.AFIO.constrain(&mut rcc);
+    //let mut afio = dp.AFIO.constrain(&mut rcc);  // add this if want to use PB8, PB9 instead
 
     // Acquire the GPIOB peripheral
-    let mut gpiob = dp.GPIOB.split(&mut rcc);
+    let gpiob = dp.GPIOB.split(&mut rcc);
 
     let scl = gpiob.pb6;
     let sda = gpiob.pb7;
 
     let i2c = dp
         .I2C1
         //.remap(&mut afio.mapr) // add this if want to use PB8, PB9 instead
-        .blocking_i2c(
-            (scl, sda),
-            Mode::Fast {
+        .i2c((scl, sda),
+         Mode::Fast {
                 frequency: 400.kHz(),
                 duty_cycle: DutyCycle::Ratio16to9,
-            },
-            &clocks,
+            }
+        , &mut rcc)
+        .blocking(
             1000,
             10,
             1000,
             1000,
+            &rcc.clocks
         );
 
     // The Adafruit boards have address 0x77 without closing the jumper on the back, the BME280 lib connects to 0x77 with `new_secondary`, use
     // `new_primary` for 0x76 if you close the jumper/solder bridge.
-    let mut bme280 = BME280::new_secondary(i2c, cp.SYST.delay(&clocks));
+    let mut bme280 = BME280::new_secondary(i2c, cp.SYST.delay(&rcc.clocks));
     bme280
         .init()
         .map_err(|error| {

src/i2c/blocking.rs

@@ -212,6 +212,10 @@ impl<I2C: Instance> BlockingI2c<I2C> {
         Ok(())
     }
 
+    pub fn reset(&mut self){
+        self.nb.reset();
+    }
+
     pub fn read(&mut self, addr: u8, buffer: &mut [u8]) -> Result<(), Error> {
         self.send_start_and_wait()?;
         self.send_addr_and_wait(addr, true)?;