Refactor flash handling to different modules for different families

embassy-stm32/src/flash/f3.rs

@@ -0,0 +1,104 @@
+use core::convert::TryInto;
+use core::ptr::write_volatile;
+
+use crate::flash::Error;
+use crate::pac;
+
+pub(crate) unsafe fn lock() {
+    pac::FLASH.cr().modify(|w| w.set_lock(true));
+}
+
+pub(crate) unsafe fn unlock() {
+    pac::FLASH.keyr().write(|w| w.set_fkeyr(0x4567_0123));
+    pac::FLASH.keyr().write(|w| w.set_fkeyr(0xCDEF_89AB));
+}
+
+pub(crate) unsafe fn blocking_write(offset: u32, buf: &[u8]) -> Result<(), Error> {
+    pac::FLASH.cr().write(|w| w.set_pg(true));
+
+    let ret = {
+        let mut ret: Result<(), Error> = Ok(());
+        let mut offset = offset;
+        for chunk in buf.chunks(2) {
+            write_volatile(
+                offset as *mut u16,
+                u16::from_le_bytes(chunk[0..2].try_into().unwrap()),
+            );
+            offset += chunk.len() as u32;
+
+            ret = blocking_wait_ready();
+            if ret.is_err() {
+                break;
+            }
+        }
+        ret
+    };
+
+    pac::FLASH.cr().write(|w| w.set_pg(false));
+
+    ret
+}
+
+pub(crate) unsafe fn blocking_erase(from: u32, to: u32) -> Result<(), Error> {
+    for page in (from..to).step_by(super::ERASE_SIZE) {
+        pac::FLASH.cr().modify(|w| {
+            w.set_per(true);
+        });
+
+        pac::FLASH.ar().write(|w| w.set_far(page));
+
+        pac::FLASH.cr().modify(|w| {
+            w.set_strt(true);
+        });
+
+        let mut ret: Result<(), Error> = blocking_wait_ready();
+
+        if !pac::FLASH.sr().read().eop() {
+            trace!("FLASH: EOP not set");
+            ret = Err(Error::Prog);
+        } else {
+            pac::FLASH.sr().write(|w| w.set_eop(true));
+        }
+
+        pac::FLASH.cr().modify(|w| w.set_per(false));
+
+        clear_all_err();
+        if ret.is_err() {
+            return ret;
+        }
+    }
+
+    Ok(())
+}
+
+pub(crate) unsafe fn clear_all_err() {
+    pac::FLASH.sr().modify(|w| {
+        if w.pgerr() {
+            w.set_pgerr(true);
+        }
+        if w.wrprterr() {
+            w.set_wrprterr(true);
+        }
+        if w.eop() {
+            w.set_eop(true);
+        }
+    });
+}
+
+pub(crate) unsafe fn blocking_wait_ready() -> Result<(), Error> {
+    loop {
+        let sr = pac::FLASH.sr().read();
+
+        if !sr.bsy() {
+            if sr.wrprterr() {
+                return Err(Error::Protected);
+            }
+
+            if sr.pgerr() {
+                return Err(Error::Seq);
+            }
+
+            return Ok(());
+        }
+    }
+}