stmhal: Use new generic I2C object in machine module.

stmhal/modmachine.c

@@ -31,6 +31,7 @@
 #include "py/runtime.h"
 #include "py/mphal.h"
 #include "extmod/machine_mem.h"
+#include "extmod/machine_i2c.h"
 #include "lib/fatfs/ff.h"
 #include "lib/fatfs/diskio.h"
 #include "gccollect.h"
@@ -449,7 +450,7 @@ STATIC const mp_map_elem_t machine_module_globals_table[] = {
 #endif
     // TODO: Per new API, both types below, if called with 1 arg (ID), should still
     // initialize master mode on the peripheral.
-    { MP_OBJ_NEW_QSTR(MP_QSTR_I2C),                 (mp_obj_t)&pyb_i2c_type },
+    { MP_OBJ_NEW_QSTR(MP_QSTR_I2C),                 (mp_obj_t)&machine_i2c_type },
     { MP_OBJ_NEW_QSTR(MP_QSTR_SPI),                 (mp_obj_t)&pyb_spi_type },
 #if 0
     { MP_OBJ_NEW_QSTR(MP_QSTR_UART),                (mp_obj_t)&pyb_uart_type },

stmhal/mpconfigport.h

@@ -90,6 +90,7 @@
 #define MICROPY_PY_UHEAPQ           (1)
 #define MICROPY_PY_UHASHLIB         (1)
 #define MICROPY_PY_MACHINE          (1)
+#define MICROPY_PY_MACHINE_I2C      (1)
 
 #define MICROPY_ENABLE_EMERGENCY_EXCEPTION_BUF   (1)
 #define MICROPY_EMERGENCY_EXCEPTION_BUF_SIZE  (0)

stmhal/mphalport.h

@@ -35,6 +35,10 @@ void mp_hal_set_interrupt_char(int c); // -1 to disable
 #define mp_hal_delay_ms HAL_Delay
 #define mp_hal_ticks_ms HAL_GetTick
 
+// needed for machine.I2C
+#include "stmhal/systick.h"
+#define mp_hal_delay_us_fast(us) sys_tick_udelay(us)
+
 // C-level pin HAL
 #include "stmhal/pin.h"
 #define mp_hal_pin_obj_t pin_obj_t