Fix failing flash verification on erase

Author: Windfisch

CHANGELOG.md

@@ -35,6 +35,7 @@ and this project adheres to [Semantic Versioning](http://semver.org/).
 - Fix i2c interactions after errors
 - Fix SPI3 alternate function remapping
 - Do not enable UART DMA flags unconditionally
+- Fix flash erase verification always failing
 
 ### Changed
 

src/flash.rs

@@ -170,7 +170,7 @@ impl<'a> FlashWriter<'a> {
                 // 'start_offset' was.
                 let size = self.sector_sz.kbytes() as u32;
                 let start = start_offset & !(size - 1);
-                for idx in start..start + size {
+                for idx in (start..start + size).step_by(2) {
                     let write_address = (FLASH_START + idx as u32) as *const u16;
                     let verify: u16 = unsafe { core::ptr::read_volatile(write_address) };
                     if verify != 0xFFFF {