ports: Make new ports/ sub-directory and move all ports there.

This is to keep the top-level directory clean, to make it clear what is
core and what is a port, and to allow the repository to grow with new ports
in a sustainable way.

1 files changed, 234 insertions, 0 deletions

diff --git a/ports/stm32/accel.c b/ports/stm32/accel.c
new file mode 100644
index 0000000000..512a6e313a
--- /dev/null
+++ b/ports/stm32/accel.c
@@ -0,0 +1,234 @@
+/*
+ * This file is part of the MicroPython project, http://micropython.org/
+ *
+ * The MIT License (MIT)
+ *
+ * Copyright (c) 2013, 2014 Damien P. George
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+
+#include <stdio.h>
+#include <string.h>
+
+#include "py/mphal.h"
+#include "py/nlr.h"
+#include "py/runtime.h"
+#include "pin.h"
+#include "genhdr/pins.h"
+#include "i2c.h"
+#include "accel.h"
+
+#if MICROPY_HW_HAS_MMA7660
+
+/// \moduleref pyb
+/// \class Accel - accelerometer control
+///
+/// Accel is an object that controls the accelerometer.  Example usage:
+///
+///     accel = pyb.Accel()
+///     for i in range(10):
+///         print(accel.x(), accel.y(), accel.z())
+///
+/// Raw values are between -32 and 31.
+
+#define MMA_ADDR (0x98)
+#define MMA_REG_X (0)
+#define MMA_REG_Y (1)
+#define MMA_REG_Z (2)
+#define MMA_REG_TILT (3)
+#define MMA_REG_MODE (7)
+#define MMA_AXIS_SIGNED_VALUE(i) (((i) & 0x3f) | ((i) & 0x20 ? (~0x1f) : 0))
+
+void accel_init(void) {
+    // PB5 is connected to AVDD; pull high to enable MMA accel device
+    mp_hal_pin_low(&MICROPY_HW_MMA_AVDD_PIN); // turn off AVDD
+    mp_hal_pin_output(&MICROPY_HW_MMA_AVDD_PIN);
+}
+
+STATIC void accel_start(void) {
+    // start the I2C bus in master mode
+    I2CHandle1.Init.AddressingMode  = I2C_ADDRESSINGMODE_7BIT;
+    I2CHandle1.Init.ClockSpeed      = 400000;
+    I2CHandle1.Init.DualAddressMode = I2C_DUALADDRESS_DISABLED;
+    I2CHandle1.Init.DutyCycle       = I2C_DUTYCYCLE_16_9;
+    I2CHandle1.Init.GeneralCallMode = I2C_GENERALCALL_DISABLED;
+    I2CHandle1.Init.NoStretchMode   = I2C_NOSTRETCH_DISABLE;
+    I2CHandle1.Init.OwnAddress1     = PYB_I2C_MASTER_ADDRESS;
+    I2CHandle1.Init.OwnAddress2     = 0xfe; // unused
+    i2c_init(&I2CHandle1);
+
+    // turn off AVDD, wait 30ms, turn on AVDD, wait 30ms again
+    mp_hal_pin_low(&MICROPY_HW_MMA_AVDD_PIN); // turn off
+    mp_hal_delay_ms(30);
+    mp_hal_pin_high(&MICROPY_HW_MMA_AVDD_PIN); // turn on
+    mp_hal_delay_ms(30);
+
+    HAL_StatusTypeDef status;
+
+    for (int i = 0; i < 10; i++) {
+        status = HAL_I2C_IsDeviceReady(&I2CHandle1, MMA_ADDR, 10, 200);
+        if (status == HAL_OK) {
+            break;
+        }
+    }
+
+    if (status != HAL_OK) {
+        mp_raise_msg(&mp_type_OSError, "accelerometer not found");
+    }
+
+    // set MMA to active mode
+    uint8_t data[1] = {1}; // active mode
+    status = HAL_I2C_Mem_Write(&I2CHandle1, MMA_ADDR, MMA_REG_MODE, I2C_MEMADD_SIZE_8BIT, data, 1, 200);
+
+    // wait for MMA to become active
+    mp_hal_delay_ms(30);
+}
+
+/******************************************************************************/
+/* MicroPython bindings                                                      */
+
+#define NUM_AXIS (3)
+#define FILT_DEPTH (4)
+
+typedef struct _pyb_accel_obj_t {
+    mp_obj_base_t base;
+    int16_t buf[NUM_AXIS * FILT_DEPTH];
+} pyb_accel_obj_t;
+
+STATIC pyb_accel_obj_t pyb_accel_obj;
+
+/// \classmethod \constructor()
+/// Create and return an accelerometer object.
+///
+/// Note: if you read accelerometer values immediately after creating this object
+/// you will get 0.  It takes around 20ms for the first sample to be ready, so,
+/// unless you have some other code between creating this object and reading its
+/// values, you should put a `pyb.delay(20)` after creating it.  For example:
+///
+///     accel = pyb.Accel()
+///     pyb.delay(20)
+///     print(accel.x())
+STATIC mp_obj_t pyb_accel_make_new(const mp_obj_type_t *type, size_t n_args, size_t n_kw, const mp_obj_t *args) {
+    // check arguments
+    mp_arg_check_num(n_args, n_kw, 0, 0, false);
+
+    // init accel object
+    pyb_accel_obj.base.type = &pyb_accel_type;
+    accel_start();
+
+    return &pyb_accel_obj;
+}
+
+STATIC mp_obj_t read_axis(int axis) {
+    uint8_t data[1];
+    HAL_I2C_Mem_Read(&I2CHandle1, MMA_ADDR, axis, I2C_MEMADD_SIZE_8BIT, data, 1, 200);
+    return mp_obj_new_int(MMA_AXIS_SIGNED_VALUE(data[0]));
+}
+
+/// \method x()
+/// Get the x-axis value.
+STATIC mp_obj_t pyb_accel_x(mp_obj_t self_in) {
+    return read_axis(MMA_REG_X);
+}
+STATIC MP_DEFINE_CONST_FUN_OBJ_1(pyb_accel_x_obj, pyb_accel_x);
+
+/// \method y()
+/// Get the y-axis value.
+STATIC mp_obj_t pyb_accel_y(mp_obj_t self_in) {
+    return read_axis(MMA_REG_Y);
+}
+STATIC MP_DEFINE_CONST_FUN_OBJ_1(pyb_accel_y_obj, pyb_accel_y);
+
+/// \method z()
+/// Get the z-axis value.
+STATIC mp_obj_t pyb_accel_z(mp_obj_t self_in) {
+    return read_axis(MMA_REG_Z);
+}
+STATIC MP_DEFINE_CONST_FUN_OBJ_1(pyb_accel_z_obj, pyb_accel_z);
+
+/// \method tilt()
+/// Get the tilt register.
+STATIC mp_obj_t pyb_accel_tilt(mp_obj_t self_in) {
+    uint8_t data[1];
+    HAL_I2C_Mem_Read(&I2CHandle1, MMA_ADDR, MMA_REG_TILT, I2C_MEMADD_SIZE_8BIT, data, 1, 200);
+    return mp_obj_new_int(data[0]);
+}
+STATIC MP_DEFINE_CONST_FUN_OBJ_1(pyb_accel_tilt_obj, pyb_accel_tilt);
+
+/// \method filtered_xyz()
+/// Get a 3-tuple of filtered x, y and z values.
+STATIC mp_obj_t pyb_accel_filtered_xyz(mp_obj_t self_in) {
+    pyb_accel_obj_t *self = self_in;
+
+    memmove(self->buf, self->buf + NUM_AXIS, NUM_AXIS * (FILT_DEPTH - 1) * sizeof(int16_t));
+
+    uint8_t data[NUM_AXIS];
+    HAL_I2C_Mem_Read(&I2CHandle1, MMA_ADDR, MMA_REG_X, I2C_MEMADD_SIZE_8BIT, data, NUM_AXIS, 200);
+
+    mp_obj_t tuple[NUM_AXIS];
+    for (int i = 0; i < NUM_AXIS; i++) {
+        self->buf[NUM_AXIS * (FILT_DEPTH - 1) + i] = MMA_AXIS_SIGNED_VALUE(data[i]);
+        int32_t val = 0;
+        for (int j = 0; j < FILT_DEPTH; j++) {
+            val += self->buf[i + NUM_AXIS * j];
+        }
+        tuple[i] = mp_obj_new_int(val);
+    }
+
+    return mp_obj_new_tuple(3, tuple);
+}
+STATIC MP_DEFINE_CONST_FUN_OBJ_1(pyb_accel_filtered_xyz_obj, pyb_accel_filtered_xyz);
+
+STATIC mp_obj_t pyb_accel_read(mp_obj_t self_in, mp_obj_t reg) {
+    uint8_t data[1];
+    HAL_I2C_Mem_Read(&I2CHandle1, MMA_ADDR, mp_obj_get_int(reg), I2C_MEMADD_SIZE_8BIT, data, 1, 200);
+    return mp_obj_new_int(data[0]);
+}
+MP_DEFINE_CONST_FUN_OBJ_2(pyb_accel_read_obj, pyb_accel_read);
+
+STATIC mp_obj_t pyb_accel_write(mp_obj_t self_in, mp_obj_t reg, mp_obj_t val) {
+    uint8_t data[1];
+    data[0] = mp_obj_get_int(val);
+    HAL_I2C_Mem_Write(&I2CHandle1, MMA_ADDR, mp_obj_get_int(reg), I2C_MEMADD_SIZE_8BIT, data, 1, 200);
+    return mp_const_none;
+}
+MP_DEFINE_CONST_FUN_OBJ_3(pyb_accel_write_obj, pyb_accel_write);
+
+STATIC const mp_rom_map_elem_t pyb_accel_locals_dict_table[] = {
+    // TODO add init, deinit, and perhaps reset methods
+    { MP_ROM_QSTR(MP_QSTR_x), MP_ROM_PTR(&pyb_accel_x_obj) },
+    { MP_ROM_QSTR(MP_QSTR_y), MP_ROM_PTR(&pyb_accel_y_obj) },
+    { MP_ROM_QSTR(MP_QSTR_z), MP_ROM_PTR(&pyb_accel_z_obj) },
+    { MP_ROM_QSTR(MP_QSTR_tilt), MP_ROM_PTR(&pyb_accel_tilt_obj) },
+    { MP_ROM_QSTR(MP_QSTR_filtered_xyz), MP_ROM_PTR(&pyb_accel_filtered_xyz_obj) },
+    { MP_ROM_QSTR(MP_QSTR_read), MP_ROM_PTR(&pyb_accel_read_obj) },
+    { MP_ROM_QSTR(MP_QSTR_write), MP_ROM_PTR(&pyb_accel_write_obj) },
+};
+
+STATIC MP_DEFINE_CONST_DICT(pyb_accel_locals_dict, pyb_accel_locals_dict_table);
+
+const mp_obj_type_t pyb_accel_type = {
+    { &mp_type_type },
+    .name = MP_QSTR_Accel,
+    .make_new = pyb_accel_make_new,
+    .locals_dict = (mp_obj_dict_t*)&pyb_accel_locals_dict,
+};
+
+#endif // MICROPY_HW_HAS_MMA7660