fix example

Author: xoviat

examples/can-echo.rs

@@ -9,32 +9,25 @@ use panic_halt as _;
 use bxcan::filter::Mask32;
 use cortex_m_rt::entry;
 use nb::block;
-use stm32f1xx_hal::{can::Can, pac, prelude::*};
+use stm32f4xx_hal::{can::Can, pac, prelude::*};
 
 #[entry]
 fn main() -> ! {
     let dp = pac::Peripherals::take().unwrap();
 
-    let mut flash = dp.FLASH.constrain();
     let mut rcc = dp.RCC.constrain();
 
     // To meet CAN clock accuracy requirements an external crystal or ceramic
     // resonator must be used. The blue pill has a 8MHz external crystal.
     // Other boards might have a crystal with another frequency or none at all.
-    rcc.cfgr.use_hse(8.mhz()).freeze(&mut flash.acr);
-
-    let mut afio = dp.AFIO.constrain(&mut rcc.apb2);
+    rcc.cfgr.use_hse(8.mhz()).freeze();
 
     let mut can1 = {
-        #[cfg(not(feature = "connectivity"))]
-        let can = Can::new(dp.CAN1, &mut rcc.apb1, dp.USB);
-        #[cfg(feature = "connectivity")]
         let can = Can::new(dp.CAN1, &mut rcc.apb1);
 
-        let mut gpioa = dp.GPIOA.split(&mut rcc.apb2);
-        let rx = gpioa.pa11.into_floating_input(&mut gpioa.crh);
-        let tx = gpioa.pa12.into_alternate_push_pull(&mut gpioa.crh);
-        can.assign_pins((tx, rx), &mut afio.mapr);
+        let mut gpioa = dp.GPIOA.split();
+        let rx = gpioa.pa11.into_floating_input();
+        let tx = gpioa.pa12.into_alternate_af7();
 
         bxcan::Can::new(can)
     };
@@ -48,14 +41,12 @@ fn main() -> ! {
     let mut filters = can1.modify_filters();
     filters.enable_bank(0, Mask32::accept_all());
 
-    #[cfg(feature = "connectivity")]
     let can2 = {
         let can = Can::new(dp.CAN2, &mut rcc.apb1);
 
-        let mut gpiob = dp.GPIOB.split(&mut rcc.apb2);
-        let rx = gpiob.pb5.into_floating_input(&mut gpiob.crl);
-        let tx = gpiob.pb6.into_alternate_push_pull(&mut gpiob.crl);
-        can.assign_pins((tx, rx), &mut afio.mapr);
+        let mut gpiob = dp.GPIOB.split();
+        let rx = gpiob.pb5.into_floating_input();
+        let tx = gpiob.pb6.into_alternate_af7();
 
         let mut can2 = bxcan::Can::new(can);
         can2.configure(|config| {