diff --git a/extmod/machine_i2c.c b/extmod/machine_i2c.c
index 9dc019283c..530d0412ed 100644
--- a/extmod/machine_i2c.c
+++ b/extmod/machine_i2c.c
@@ -392,45 +392,51 @@ STATIC mp_obj_t machine_i2c_write(mp_obj_t self_in, mp_obj_t buf_in) {
 }
 MP_DEFINE_CONST_FUN_OBJ_2(machine_i2c_write_obj, machine_i2c_write);
 
-STATIC mp_obj_t machine_i2c_readfrom(mp_obj_t self_in, mp_obj_t addr_in, mp_obj_t nbytes_in) {
-    mp_obj_base_t *self = (mp_obj_base_t*)MP_OBJ_TO_PTR(self_in);
+STATIC mp_obj_t machine_i2c_readfrom(size_t n_args, const mp_obj_t *args) {
+    mp_obj_base_t *self = (mp_obj_base_t*)MP_OBJ_TO_PTR(args[0]);
     mp_machine_i2c_p_t *i2c_p = (mp_machine_i2c_p_t*)self->type->protocol;
+    mp_int_t addr = mp_obj_get_int(args[1]);
     vstr_t vstr;
-    vstr_init_len(&vstr, mp_obj_get_int(nbytes_in));
-    int ret = i2c_p->readfrom(self, mp_obj_get_int(addr_in), (uint8_t*)vstr.buf, vstr.len, true);
+    vstr_init_len(&vstr, mp_obj_get_int(args[2]));
+    bool stop = (n_args == 3) ? true : mp_obj_is_true(args[3]);
+    int ret = i2c_p->readfrom(self, addr, (uint8_t*)vstr.buf, vstr.len, stop);
     if (ret < 0) {
         mp_raise_OSError(-ret);
     }
     return mp_obj_new_str_from_vstr(&mp_type_bytes, &vstr);
 }
-MP_DEFINE_CONST_FUN_OBJ_3(machine_i2c_readfrom_obj, machine_i2c_readfrom);
+MP_DEFINE_CONST_FUN_OBJ_VAR_BETWEEN(machine_i2c_readfrom_obj, 3, 4, machine_i2c_readfrom);
 
-STATIC mp_obj_t machine_i2c_readfrom_into(mp_obj_t self_in, mp_obj_t addr_in, mp_obj_t buf_in) {
-    mp_obj_base_t *self = (mp_obj_base_t*)MP_OBJ_TO_PTR(self_in);
+STATIC mp_obj_t machine_i2c_readfrom_into(size_t n_args, const mp_obj_t *args) {
+    mp_obj_base_t *self = (mp_obj_base_t*)MP_OBJ_TO_PTR(args[0]);
     mp_machine_i2c_p_t *i2c_p = (mp_machine_i2c_p_t*)self->type->protocol;
+    mp_int_t addr = mp_obj_get_int(args[1]);
     mp_buffer_info_t bufinfo;
-    mp_get_buffer_raise(buf_in, &bufinfo, MP_BUFFER_WRITE);
-    int ret = i2c_p->readfrom(self, mp_obj_get_int(addr_in), bufinfo.buf, bufinfo.len, true);
+    mp_get_buffer_raise(args[2], &bufinfo, MP_BUFFER_WRITE);
+    bool stop = (n_args == 3) ? true : mp_obj_is_true(args[3]);
+    int ret = i2c_p->readfrom(self, addr, bufinfo.buf, bufinfo.len, stop);
     if (ret < 0) {
         mp_raise_OSError(-ret);
     }
     return mp_const_none;
 }
-MP_DEFINE_CONST_FUN_OBJ_3(machine_i2c_readfrom_into_obj, machine_i2c_readfrom_into);
+MP_DEFINE_CONST_FUN_OBJ_VAR_BETWEEN(machine_i2c_readfrom_into_obj, 3, 4, machine_i2c_readfrom_into);
 
-STATIC mp_obj_t machine_i2c_writeto(mp_obj_t self_in, mp_obj_t addr_in, mp_obj_t buf_in) {
-    mp_obj_base_t *self = (mp_obj_base_t*)MP_OBJ_TO_PTR(self_in);
+STATIC mp_obj_t machine_i2c_writeto(size_t n_args, const mp_obj_t *args) {
+    mp_obj_base_t *self = (mp_obj_base_t*)MP_OBJ_TO_PTR(args[0]);
     mp_machine_i2c_p_t *i2c_p = (mp_machine_i2c_p_t*)self->type->protocol;
+    mp_int_t addr = mp_obj_get_int(args[1]);
     mp_buffer_info_t bufinfo;
-    mp_get_buffer_raise(buf_in, &bufinfo, MP_BUFFER_READ);
-    int ret = i2c_p->writeto(self, mp_obj_get_int(addr_in), bufinfo.buf, bufinfo.len, true);
+    mp_get_buffer_raise(args[2], &bufinfo, MP_BUFFER_READ);
+    bool stop = (n_args == 3) ? true : mp_obj_is_true(args[3]);
+    int ret = i2c_p->writeto(self, addr,  bufinfo.buf, bufinfo.len, stop);
     if (ret < 0) {
         mp_raise_OSError(-ret);
     }
     // return number of acks received
     return MP_OBJ_NEW_SMALL_INT(ret);
 }
-STATIC MP_DEFINE_CONST_FUN_OBJ_3(machine_i2c_writeto_obj, machine_i2c_writeto);
+STATIC MP_DEFINE_CONST_FUN_OBJ_VAR_BETWEEN(machine_i2c_writeto_obj, 3, 4, machine_i2c_writeto);
 
 STATIC int read_mem(mp_obj_t self_in, uint16_t addr, uint32_t memaddr, uint8_t addrsize, uint8_t *buf, size_t len) {
     mp_obj_base_t *self = (mp_obj_base_t*)MP_OBJ_TO_PTR(self_in);