all: Bump version to 1.19.1.

Signed-off-by: Damien George <damien@micropython.org>

docs/conf.py

@@ -74,7 +74,7 @@ copyright = '- The MicroPython Documentation is Copyright © 2014-2022, Damien P
 #
 # We don't follow "The short X.Y version" vs "The full version, including alpha/beta/rc tags"
 # breakdown, so use the same version identifier for both to avoid confusion.
-version = release = '1.19'
+version = release = '1.19.1'
 
 # The language for content autogenerated by Sphinx. Refer to documentation
 # for a list of supported languages.

extmod/machine_i2c.c

@@ -515,19 +515,20 @@ STATIC int read_mem(mp_obj_t self_in, uint16_t addr, uint32_t memaddr, uint8_t a
     size_t memaddr_len = fill_memaddr_buf(&memaddr_buf[0], memaddr, addrsize);
 
     #if MICROPY_PY_MACHINE_I2C_TRANSFER_WRITE1
-
-    // Create partial write and read buffers
-    mp_machine_i2c_buf_t bufs[2] = {
-        {.len = memaddr_len, .buf = memaddr_buf},
-        {.len = len, .buf = buf},
-    };
-
-    // Do write+read I2C transfer
+    // The I2C transfer function may support the MP_MACHINE_I2C_FLAG_WRITE1 option
     mp_machine_i2c_p_t *i2c_p = (mp_machine_i2c_p_t *)self->type->protocol;
-    return i2c_p->transfer(self, addr, 2, bufs,
-        MP_MACHINE_I2C_FLAG_WRITE1 | MP_MACHINE_I2C_FLAG_READ | MP_MACHINE_I2C_FLAG_STOP);
+    if (i2c_p->transfer_supports_write1) {
+        // Create partial write and read buffers
+        mp_machine_i2c_buf_t bufs[2] = {
+            {.len = memaddr_len, .buf = memaddr_buf},
+            {.len = len, .buf = buf},
+        };
 
-    #else
+        // Do write+read I2C transfer
+        return i2c_p->transfer(self, addr, 2, bufs,
+            MP_MACHINE_I2C_FLAG_WRITE1 | MP_MACHINE_I2C_FLAG_READ | MP_MACHINE_I2C_FLAG_STOP);
+    }
+    #endif
 
     int ret = mp_machine_i2c_writeto(self, addr, memaddr_buf, memaddr_len, false);
     if (ret != memaddr_len) {
@@ -536,8 +537,6 @@ STATIC int read_mem(mp_obj_t self_in, uint16_t addr, uint32_t memaddr, uint8_t a
         return ret;
     }
     return mp_machine_i2c_readfrom(self, addr, buf, len, true);
-
-    #endif
 }
 
 STATIC int write_mem(mp_obj_t self_in, uint16_t addr, uint32_t memaddr, uint8_t addrsize, const uint8_t *buf, size_t len) {

extmod/machine_i2c.h

@@ -61,6 +61,9 @@ typedef struct _mp_machine_i2c_buf_t {
 // - transfer must be non-NULL
 // - transfer_single only needs to be set if transfer=mp_machine_i2c_transfer_adaptor
 typedef struct _mp_machine_i2c_p_t {
+    #if MICROPY_PY_MACHINE_I2C_TRANSFER_WRITE1
+    bool transfer_supports_write1;
+    #endif
     void (*init)(mp_obj_base_t *obj, size_t n_args, const mp_obj_t *pos_args, mp_map_t *kw_args);
     int (*start)(mp_obj_base_t *obj);
     int (*stop)(mp_obj_base_t *obj);

ports/esp32/machine_i2c.c

@@ -188,6 +188,7 @@ mp_obj_t machine_hw_i2c_make_new(const mp_obj_type_t *type, size_t n_args, size_
 }
 
 STATIC const mp_machine_i2c_p_t machine_hw_i2c_p = {
+    .transfer_supports_write1 = true,
     .transfer = machine_hw_i2c_transfer,
 };
 

py/mpconfig.h

@@ -29,7 +29,7 @@
 // Current version of MicroPython
 #define MICROPY_VERSION_MAJOR 1
 #define MICROPY_VERSION_MINOR 19
-#define MICROPY_VERSION_MICRO 0
+#define MICROPY_VERSION_MICRO 1
 
 // Combined version as a 32-bit number for convenience
 #define MICROPY_VERSION ( \