diff --git a/examples/ble-uart/main.c b/examples/ble-uart/main.c
index 2a1db7bf2..2095fecaa 100644
--- a/examples/ble-uart/main.c
+++ b/examples/ble-uart/main.c
@@ -62,7 +62,7 @@ void ble_evt_user_handler(ble_evt_t* p_ble_evt) {
 // This gets called with the serial data from the BLE central.
 static void nus_data_handler(ble_nus_t* p_nus, uint8_t* p_data, uint16_t length) {
   UNUSED_PARAMETER(p_nus);
-  int bytes_written;
+  uint32_t bytes_written;
 
   // In this app, just print it to the console.
   libtocksync_console_write(p_data, length, &bytes_written);
diff --git a/examples/i2c-usb-bridge/main.c b/examples/i2c-usb-bridge/main.c
index b0771ee30..0b6aad3d1 100644
--- a/examples/i2c-usb-bridge/main.c
+++ b/examples/i2c-usb-bridge/main.c
@@ -14,13 +14,13 @@ uint8_t send_buf[DATA_LEN];
 
 static int getch(void) {
   uint8_t buffer[1];
-  int number_read;
+  uint32_t number_read;
   libtocksync_console_read(buffer, 1, &number_read);
   return buffer[0];
 }
 
-static int putnstr(char* str, int len) {
-  int number_written;
+static uint32_t putnstr(char* str, int len) {
+  uint32_t number_written;
   libtocksync_console_read((uint8_t*) str, len, &number_written);
   return number_written;
 }
diff --git a/examples/tests/console/console/main.c b/examples/tests/console/console/main.c
index 61b5f43bc..44a87f3a5 100644
--- a/examples/tests/console/console/main.c
+++ b/examples/tests/console/console/main.c
@@ -7,7 +7,7 @@
 
 static int getch(void) {
   uint8_t buffer[1];
-  int number_read;
+  uint32_t number_read;
   libtocksync_console_read(buffer, 1, &number_read);
   return buffer[0];
 }
diff --git a/examples/tests/console/console_recv_long/main.c b/examples/tests/console/console_recv_long/main.c
index 2a3d5afa6..6f53fdf16 100644
--- a/examples/tests/console/console_recv_long/main.c
+++ b/examples/tests/console/console_recv_long/main.c
@@ -5,7 +5,7 @@
 uint8_t buf[100];
 
 int main(void) {
-  int number_read;
+  uint32_t number_read;
   int ret = libtocksync_console_read(buf, 61, &number_read);
   if (ret != RETURNCODE_SUCCESS) {
     printf("[SHORT] Error doing UART receive: %i\n", ret);
@@ -13,7 +13,7 @@ int main(void) {
   }
 
   printf("\n\nconsole_recv_long: ");
-  for (int i = 0; i < number_read; i++) {
+  for (uint32_t i = 0; i < number_read; i++) {
     printf("%c", buf[i]);
   }
   printf("\n");
diff --git a/examples/tests/console/console_recv_short/main.c b/examples/tests/console/console_recv_short/main.c
index 97a3569ca..5c74a7934 100644
--- a/examples/tests/console/console_recv_short/main.c
+++ b/examples/tests/console/console_recv_short/main.c
@@ -5,7 +5,7 @@
 uint8_t buf[100];
 
 int main(void) {
-  int number_read;
+  uint32_t number_read;
   int ret = libtocksync_console_read(buf, 11, &number_read);
   if (ret != RETURNCODE_SUCCESS) {
     printf("[SHORT] Error doing UART receive: %i\n", ret);
@@ -13,7 +13,7 @@ int main(void) {
   }
 
   printf("\n\nconsole_recv_short: ");
-  for (int i = 0; i < number_read; i++) {
+  for (uint32_t i = 0; i < number_read; i++) {
     printf("%c", buf[i]);
   }
   printf("\n");
diff --git a/examples/tests/kv/kv_interactive/main.c b/examples/tests/kv/kv_interactive/main.c
index 42b4c319f..5ee88449b 100644
--- a/examples/tests/kv/kv_interactive/main.c
+++ b/examples/tests/kv/kv_interactive/main.c
@@ -17,7 +17,7 @@ char read_buf[DATA_LEN];
 
 static int getch(void) {
   uint8_t buffer[1];
-  int number_read;
+  uint32_t number_read;
   libtocksync_console_read(buffer, 1, &number_read);
   return buffer[0];
 }
diff --git a/examples/tests/number_guess_game/main.c b/examples/tests/number_guess_game/main.c
index 394db999d..bc1ae9708 100644
--- a/examples/tests/number_guess_game/main.c
+++ b/examples/tests/number_guess_game/main.c
@@ -8,13 +8,13 @@
 
 static int getch(void) {
   uint8_t buffer[1];
-  int number_read;
+  uint32_t number_read;
   libtocksync_console_read(buffer, 1, &number_read);
   return buffer[0];
 }
 
-static int putnstr(const char* str, int len) {
-  int number_written;
+static uint32_t putnstr(const char* str, int len) {
+  uint32_t number_written;
   libtocksync_console_read((uint8_t*) str, len, &number_written);
   return number_written;
 }
diff --git a/libtock-sync/interface/console.c b/libtock-sync/interface/console.c
index 28945d424..a1568f023 100644
--- a/libtock-sync/interface/console.c
+++ b/libtock-sync/interface/console.c
@@ -1,51 +1,41 @@
+#include <libtock/defer.h>
 #include <libtock/interface/syscalls/console_syscalls.h>
 
 #include "console.h"
 
-struct console_result {
-  bool fired;
-  int length;
-  returncode_t result;
-};
-
-static struct console_result result = { .fired = false };
-
-static void generic_cb(returncode_t ret, uint32_t length) {
-  result.length = length;
-  result.fired  = true;
-  result.result = ret;
-}
+#include "syscalls/console_syscalls.h"
 
 bool libtocksync_console_exists(void) {
   return libtock_console_driver_exists();
 }
 
-returncode_t libtocksync_console_write(const uint8_t* buffer, uint32_t length, int* written) {
-  int err;
-  result.fired = false;
+returncode_t libtocksync_console_write(const uint8_t* buffer, uint32_t length, uint32_t* written) {
+  returncode_t ret;
 
-  err = libtock_console_write(buffer, length, &generic_cb);
-  if (err != RETURNCODE_SUCCESS) return err;
+  ret = libtock_console_set_read_allow(buffer, length);
+  if (ret != RETURNCODE_SUCCESS) return ret;
+  defer { libtock_console_set_read_allow(NULL, 0);
+  };
 
-  // Wait for the callback.
-  yield_for(&result.fired);
-  if (result.result != RETURNCODE_SUCCESS) return result.result;
+  ret = libtock_console_command_write(length);
+  if (ret != RETURNCODE_SUCCESS) return ret;
 
-  *written = result.length;
-  return RETURNCODE_SUCCESS;
+  ret = libtocksync_console_yield_wait_for_write(written);
+  return ret;
 }
 
-returncode_t libtocksync_console_read(uint8_t* buffer, uint32_t length, int* read) {
-  int err;
-  result.fired = false;
 
-  err = libtock_console_read(buffer, length, &generic_cb);
-  if (err != RETURNCODE_SUCCESS) return err;
+returncode_t libtocksync_console_read(uint8_t* buffer, uint32_t length, uint32_t* read) {
+  returncode_t ret;
+
+  ret = libtock_console_set_readwrite_allow(buffer, length);
+  if (ret != RETURNCODE_SUCCESS) return ret;
+  defer { libtock_console_set_readwrite_allow(NULL, 0);
+  };
 
-  // Wait for the callback.
-  yield_for(&result.fired);
-  if (result.result != RETURNCODE_SUCCESS) return result.result;
+  ret = libtock_console_command_read(length);
+  if (ret != RETURNCODE_SUCCESS) return ret;
 
-  *read = result.length;
-  return RETURNCODE_SUCCESS;
+  ret = libtocksync_console_yield_wait_for_write(read);
+  return ret;
 }
diff --git a/libtock-sync/interface/console.h b/libtock-sync/interface/console.h
index c752000d2..8118c713f 100644
--- a/libtock-sync/interface/console.h
+++ b/libtock-sync/interface/console.h
@@ -1,6 +1,5 @@
 #pragma once
 
-#include <libtock/interface/console.h>
 #include <libtock/tock.h>
 
 #ifdef __cplusplus
@@ -9,9 +8,9 @@ extern "C" {
 
 bool libtocksync_console_exists(void);
 
-returncode_t libtocksync_console_write(const uint8_t* buffer, uint32_t length, int* written);
+returncode_t libtocksync_console_write(const uint8_t* buffer, uint32_t length, uint32_t* written);
 
-returncode_t libtocksync_console_read(uint8_t* buffer, uint32_t length, int* read);
+returncode_t libtocksync_console_read(uint8_t* buffer, uint32_t length, uint32_t* read);
 
 #ifdef __cplusplus
 }
diff --git a/libtock-sync/interface/syscalls/console_syscalls.c b/libtock-sync/interface/syscalls/console_syscalls.c
new file mode 100644
index 000000000..88ee29a3e
--- /dev/null
+++ b/libtock-sync/interface/syscalls/console_syscalls.c
@@ -0,0 +1,19 @@
+#include "console_syscalls.h"
+
+returncode_t libtocksync_console_yield_wait_for_write(uint32_t* bytes_written) {
+  yield_waitfor_return_t ret;
+  ret = yield_wait_for(DRIVER_NUM_CONSOLE, 1);
+
+  *bytes_written = ret.data1;
+
+  return (returncode_t) ret.data0;
+}
+
+returncode_t libtocksync_console_yield_wait_for_read(uint32_t* bytes_read) {
+  yield_waitfor_return_t ret;
+  ret = yield_wait_for(DRIVER_NUM_CONSOLE, 2);
+
+  *bytes_read = ret.data1;
+
+  return (returncode_t) ret.data0;
+}
diff --git a/libtock-sync/interface/syscalls/console_syscalls.h b/libtock-sync/interface/syscalls/console_syscalls.h
new file mode 100644
index 000000000..44365ba71
--- /dev/null
+++ b/libtock-sync/interface/syscalls/console_syscalls.h
@@ -0,0 +1,15 @@
+#pragma once
+
+#include <libtock/interface/syscalls/console_syscalls.h>
+#include <libtock/tock.h>
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+returncode_t libtocksync_console_yield_wait_for_write(uint32_t* bytes_written);
+returncode_t libtocksync_console_yield_wait_for_read(uint32_t* bytes_read);
+
+#ifdef __cplusplus
+}
+#endif
diff --git a/libtock-sync/sys.c b/libtock-sync/sys.c
index a26a1cafd..45c59e356 100644
--- a/libtock-sync/sys.c
+++ b/libtock-sync/sys.c
@@ -12,7 +12,7 @@
 // ------------------------------
 
 int _write(__attribute__ ((unused)) int fd, const void* buf, uint32_t count) {
-  int written;
+  uint32_t written;
   libtocksync_console_write((const uint8_t*) buf, count, &written);
-  return written;
+  return (int) written;
 }
diff --git a/libtock/interface/console.h b/libtock/interface/console.h
index 608e76331..742c5f6e1 100644
--- a/libtock/interface/console.h
+++ b/libtock/interface/console.h
@@ -8,12 +8,12 @@ extern "C" {
 
 // Function signature for write done callbacks.
 //
-// - `length` (`int`): Number of bytes written
+// - `length` (`uint32_t`): Number of bytes written
 typedef void (*libtock_console_callback_write)(returncode_t, uint32_t);
 
 // Function signature for read done callbacks.
 //
-// - `length` (`int`): Number of bytes read
+// - `length` (`uint32_t`): Number of bytes read
 typedef void (*libtock_console_callback_read)(returncode_t, uint32_t);
 
 // Check if the driver exists.