diff --git a/src/defmt.rs b/src/defmt.rs
index b65230f..6baeb07 100644
--- a/src/defmt.rs
+++ b/src/defmt.rs
@@ -84,5 +84,5 @@ unsafe impl defmt::Logger for Logger {
 }
 
 fn do_write(bytes: &[u8]) {
-    Printer.write_bytes(bytes)
+    Printer.write_bytes_assume_cs(bytes)
 }
diff --git a/src/lib.rs b/src/lib.rs
index a737c42..addb99e 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -76,16 +76,20 @@ impl core::fmt::Write for Printer {
     }
 }
 
+impl Printer {
+    pub fn write_bytes(&mut self, bytes: &[u8]) {
+        with(|| self.write_bytes_assume_cs(bytes))
+    }
+}
+
 #[cfg(feature = "rtt")]
 mod rtt_printer {
     impl super::Printer {
-        pub fn write_bytes(&mut self, bytes: &[u8]) {
-            super::with(|| {
-                let count = crate::rtt::write_bytes_internal(bytes);
-                if count < bytes.len() {
-                    crate::rtt::write_bytes_internal(&bytes[count..]);
-                }
-            })
+        pub(crate) fn write_bytes_assume_cs(&mut self, bytes: &[u8]) {
+            let count = crate::rtt::write_bytes_internal(bytes);
+            if count < bytes.len() {
+                crate::rtt::write_bytes_internal(&bytes[count..]);
+            }
         }
     }
 }
@@ -114,37 +118,35 @@ mod serial_jtag_printer {
         feature = "esp32s3"
     ))]
     impl super::Printer {
-        pub fn write_bytes(&mut self, bytes: &[u8]) {
-            super::with(|| {
-                const TIMEOUT_ITERATIONS: usize = 5_000;
+        pub(crate) fn write_bytes_assume_cs(&mut self, bytes: &[u8]) {
+            const TIMEOUT_ITERATIONS: usize = 5_000;
 
-                let fifo = SERIAL_JTAG_FIFO_REG as *mut u32;
-                let conf = SERIAL_JTAG_CONF_REG as *mut u32;
+            let fifo = SERIAL_JTAG_FIFO_REG as *mut u32;
+            let conf = SERIAL_JTAG_CONF_REG as *mut u32;
 
-                if unsafe { conf.read_volatile() } & 0b011 == 0b000 {
-                    // still wasn't able to drain the FIFO - early return
-                    return;
-                }
+            if unsafe { conf.read_volatile() } & 0b011 == 0b000 {
+                // still wasn't able to drain the FIFO - early return
+                return;
+            }
 
-                // todo 64 byte chunks max
-                for chunk in bytes.chunks(32) {
-                    unsafe {
-                        for &b in chunk {
-                            fifo.write_volatile(b as u32);
-                        }
-                        conf.write_volatile(0b001);
-
-                        let mut timeout = TIMEOUT_ITERATIONS;
-                        while conf.read_volatile() & 0b011 == 0b000 {
-                            // wait
-                            timeout -= 1;
-                            if timeout == 0 {
-                                return;
-                            }
+            // todo 64 byte chunks max
+            for chunk in bytes.chunks(32) {
+                unsafe {
+                    for &b in chunk {
+                        fifo.write_volatile(b as u32);
+                    }
+                    conf.write_volatile(0b001);
+
+                    let mut timeout = TIMEOUT_ITERATIONS;
+                    while conf.read_volatile() & 0b011 == 0b000 {
+                        // wait
+                        timeout -= 1;
+                        if timeout == 0 {
+                            return;
                         }
                     }
                 }
-            })
+            }
         }
     }
 }
@@ -164,38 +166,34 @@ mod uart_printer {
 
     impl super::Printer {
         #[cfg(not(feature = "esp32s2"))]
-        pub fn write_bytes(&mut self, bytes: &[u8]) {
-            super::with(|| {
-                for &b in bytes {
-                    unsafe {
-                        let uart_tx_one_char: unsafe extern "C" fn(u8) -> i32 =
-                            core::mem::transmute(UART_TX_ONE_CHAR);
-                        uart_tx_one_char(b)
-                    };
-                }
-            })
+        pub(crate) fn write_bytes_assume_cs(&mut self, bytes: &[u8]) {
+            for &b in bytes {
+                unsafe {
+                    let uart_tx_one_char: unsafe extern "C" fn(u8) -> i32 =
+                        core::mem::transmute(UART_TX_ONE_CHAR);
+                    uart_tx_one_char(b)
+                };
+            }
         }
 
         #[cfg(feature = "esp32s2")]
-        pub fn write_bytes(&mut self, bytes: &[u8]) {
-            super::with(|| {
-                // On ESP32-S2 the UART_TX_ONE_CHAR ROM-function seems to have some issues.
-                for chunk in bytes.chunks(64) {
-                    for &b in chunk {
-                        unsafe {
-                            // write FIFO
-                            (0x3f400000 as *mut u32).write_volatile(b as u32);
-                        };
-                    }
-
-                    // wait for TX_DONE
-                    while unsafe { (0x3f400004 as *const u32).read_volatile() } & (1 << 14) == 0 {}
+        pub(crate) fn write_bytes_assume_cs(&mut self, bytes: &[u8]) {
+            // On ESP32-S2 the UART_TX_ONE_CHAR ROM-function seems to have some issues.
+            for chunk in bytes.chunks(64) {
+                for &b in chunk {
                     unsafe {
-                        // reset TX_DONE
-                        (0x3f400010 as *mut u32).write_volatile(1 << 14);
-                    }
+                        // write FIFO
+                        (0x3f400000 as *mut u32).write_volatile(b as u32);
+                    };
                 }
-            })
+
+                // wait for TX_DONE
+                while unsafe { (0x3f400004 as *const u32).read_volatile() } & (1 << 14) == 0 {}
+                unsafe {
+                    // reset TX_DONE
+                    (0x3f400010 as *mut u32).write_volatile(1 << 14);
+                }
+            }
         }
     }
 }