1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
|
/*
* This file is part of the MicroPython project, http://micropython.org/
*
* The MIT License (MIT)
*
* Copyright (c) 2016 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 <stdint.h>
#include <string.h>
#include <errno.h>
#include "ets_sys.h"
#include "etshal.h"
#include "ets_alt_task.h"
#include "py/runtime.h"
#include "py/stream.h"
#include "modpyb.h"
typedef struct _pyb_spi_obj_t {
mp_obj_base_t base;
uint32_t baudrate;
uint8_t polarity;
uint8_t phase;
pyb_pin_obj_t *sck;
pyb_pin_obj_t *mosi;
pyb_pin_obj_t *miso;
} pyb_spi_obj_t;
STATIC void mp_hal_spi_transfer(pyb_spi_obj_t *self, size_t src_len, const uint8_t *src_buf, size_t dest_len, uint8_t *dest_buf) {
// only MSB transfer is implemented
uint32_t delay_half = 500000 / self->baudrate + 1;
for (size_t i = 0; i < src_len || i < dest_len; ++i) {
uint8_t data_out;
if (src_len == 1) {
data_out = src_buf[0];
} else {
data_out = src_buf[i];
}
uint8_t data_in = 0;
for (int j = 0; j < 8; ++j, data_out <<= 1) {
pin_set(self->mosi->phys_port, (data_out >> 7) & 1);
if (self->phase == 0) {
ets_delay_us(delay_half);
pin_set(self->sck->phys_port, 1 - self->polarity);
} else {
pin_set(self->sck->phys_port, 1 - self->polarity);
ets_delay_us(delay_half);
}
data_in = (data_in << 1) | pin_get(self->miso->phys_port);
if (self->phase == 0) {
ets_delay_us(delay_half);
pin_set(self->sck->phys_port, self->polarity);
} else {
pin_set(self->sck->phys_port, self->polarity);
ets_delay_us(delay_half);
}
}
if (dest_len != 0) {
dest_buf[i] = data_in;
}
// make sure pending tasks have a chance to run
ets_loop_iter();
}
}
/******************************************************************************/
// MicroPython bindings for SPI
STATIC void pyb_spi_print(const mp_print_t *print, mp_obj_t self_in, mp_print_kind_t kind) {
pyb_spi_obj_t *self = MP_OBJ_TO_PTR(self_in);
mp_printf(print, "SPI(baudrate=%u, polarity=%u, phase=%u, sck=%u, mosi=%u, miso=%u)",
self->baudrate, self->polarity, self->phase, self->sck->phys_port, self->mosi->phys_port, self->miso->phys_port);
}
STATIC void pyb_spi_init_helper(pyb_spi_obj_t *self, size_t n_args, const mp_obj_t *pos_args, mp_map_t *kw_args) {
enum { ARG_baudrate, ARG_polarity, ARG_phase, ARG_sck, ARG_mosi, ARG_miso };
static const mp_arg_t allowed_args[] = {
{ MP_QSTR_baudrate, MP_ARG_INT, {.u_int = -1} },
{ MP_QSTR_polarity, MP_ARG_INT, {.u_int = -1} },
{ MP_QSTR_phase, MP_ARG_INT, {.u_int = -1} },
{ MP_QSTR_sck, MP_ARG_KW_ONLY | MP_ARG_OBJ, {.u_obj = MP_OBJ_NULL} },
{ MP_QSTR_mosi, MP_ARG_KW_ONLY | MP_ARG_OBJ, {.u_obj = MP_OBJ_NULL} },
{ MP_QSTR_miso, MP_ARG_KW_ONLY | MP_ARG_OBJ, {.u_obj = MP_OBJ_NULL} },
};
mp_arg_val_t args[MP_ARRAY_SIZE(allowed_args)];
mp_arg_parse_all(n_args, pos_args, kw_args, MP_ARRAY_SIZE(allowed_args), allowed_args, args);
if (args[ARG_baudrate].u_int != -1) {
self->baudrate = args[ARG_baudrate].u_int;
}
if (args[ARG_polarity].u_int != -1) {
self->polarity = args[ARG_polarity].u_int;
}
if (args[ARG_phase].u_int != -1) {
self->phase = args[ARG_phase].u_int;
}
if (args[ARG_sck].u_obj != MP_OBJ_NULL) {
self->sck = mp_obj_get_pin_obj(args[ARG_sck].u_obj);
}
if (args[ARG_mosi].u_obj != MP_OBJ_NULL) {
self->mosi = mp_obj_get_pin_obj(args[ARG_mosi].u_obj);
}
if (args[ARG_miso].u_obj != MP_OBJ_NULL) {
self->miso = mp_obj_get_pin_obj(args[ARG_miso].u_obj);
}
}
STATIC mp_obj_t pyb_spi_make_new(const mp_obj_type_t *type, size_t n_args, size_t n_kw, const mp_obj_t *args) {
mp_arg_check_num(n_args, n_kw, 0, MP_OBJ_FUN_ARGS_MAX, true);
pyb_spi_obj_t *self = m_new_obj(pyb_spi_obj_t);
self->base.type = &pyb_spi_type;
// set defaults
self->baudrate = 500000;
self->polarity = 0;
self->phase = 0;
self->sck = NULL;
self->mosi = NULL;
self->miso = NULL;
mp_map_t kw_args;
mp_map_init_fixed_table(&kw_args, n_kw, args + n_args);
pyb_spi_init_helper(self, n_args, args, &kw_args);
return MP_OBJ_FROM_PTR(self);
}
STATIC mp_obj_t pyb_spi_init(size_t n_args, const mp_obj_t *args, mp_map_t *kw_args) {
pyb_spi_init_helper(args[0], n_args - 1, args + 1, kw_args);
return mp_const_none;
}
MP_DEFINE_CONST_FUN_OBJ_KW(pyb_spi_init_obj, 1, pyb_spi_init);
STATIC mp_obj_t pyb_spi_read(size_t n_args, const mp_obj_t *args) {
pyb_spi_obj_t *self = MP_OBJ_TO_PTR(args[0]);
uint8_t write_byte = 0;
if (n_args == 3) {
write_byte = mp_obj_get_int(args[2]);
}
vstr_t vstr;
vstr_init_len(&vstr, mp_obj_get_int(args[1]));
mp_hal_spi_transfer(self, 1, &write_byte, vstr.len, (uint8_t*)vstr.buf);
return mp_obj_new_str_from_vstr(&mp_type_bytes, &vstr);
}
MP_DEFINE_CONST_FUN_OBJ_VAR_BETWEEN(pyb_spi_read_obj, 2, 3, pyb_spi_read);
STATIC mp_obj_t pyb_spi_readinto(size_t n_args, const mp_obj_t *args) {
pyb_spi_obj_t *self = MP_OBJ_TO_PTR(args[0]);
mp_buffer_info_t bufinfo;
mp_get_buffer_raise(args[1], &bufinfo, MP_BUFFER_WRITE);
uint8_t write_byte = 0;
if (n_args == 3) {
write_byte = mp_obj_get_int(args[2]);
}
mp_hal_spi_transfer(self, 1, &write_byte, bufinfo.len, (uint8_t*)bufinfo.buf);
return mp_const_none;
}
MP_DEFINE_CONST_FUN_OBJ_VAR_BETWEEN(pyb_spi_readinto_obj, 2, 3, pyb_spi_readinto);
STATIC mp_obj_t pyb_spi_write(mp_obj_t self_in, mp_obj_t wr_buf_in) {
pyb_spi_obj_t *self = MP_OBJ_TO_PTR(self_in);
mp_buffer_info_t src_buf;
mp_get_buffer_raise(wr_buf_in, &src_buf, MP_BUFFER_READ);
mp_hal_spi_transfer(self, src_buf.len, (const uint8_t*)src_buf.buf, 0, NULL);
return mp_const_none;
}
MP_DEFINE_CONST_FUN_OBJ_2(pyb_spi_write_obj, pyb_spi_write);
STATIC mp_obj_t pyb_spi_write_readinto(mp_obj_t self_in, mp_obj_t wr_buf_in, mp_obj_t rd_buf_in) {
pyb_spi_obj_t *self = MP_OBJ_TO_PTR(self_in);
mp_buffer_info_t src_buf;
mp_get_buffer_raise(wr_buf_in, &src_buf, MP_BUFFER_READ);
mp_buffer_info_t dest_buf;
mp_get_buffer_raise(rd_buf_in, &dest_buf, MP_BUFFER_WRITE);
if (src_buf.len != dest_buf.len) {
nlr_raise(mp_obj_new_exception_msg_varg(&mp_type_ValueError, "buffers must be the same length"));
}
mp_hal_spi_transfer(self, src_buf.len, (const uint8_t*)src_buf.buf, dest_buf.len, (uint8_t*)dest_buf.buf);
return mp_const_none;
}
MP_DEFINE_CONST_FUN_OBJ_3(pyb_spi_write_readinto_obj, pyb_spi_write_readinto);
STATIC const mp_rom_map_elem_t pyb_spi_locals_dict_table[] = {
{ MP_ROM_QSTR(MP_QSTR_init), MP_ROM_PTR(&pyb_spi_init_obj) },
{ MP_ROM_QSTR(MP_QSTR_read), MP_ROM_PTR(&pyb_spi_read_obj) },
{ MP_ROM_QSTR(MP_QSTR_readinto), MP_ROM_PTR(&pyb_spi_readinto_obj) },
{ MP_ROM_QSTR(MP_QSTR_write), MP_ROM_PTR(&pyb_spi_write_obj) },
{ MP_ROM_QSTR(MP_QSTR_write_readinto), MP_ROM_PTR(&pyb_spi_write_readinto_obj) },
};
STATIC MP_DEFINE_CONST_DICT(pyb_spi_locals_dict, pyb_spi_locals_dict_table);
const mp_obj_type_t pyb_spi_type = {
{ &mp_type_type },
.name = MP_QSTR_SPI,
.print = pyb_spi_print,
.make_new = pyb_spi_make_new,
.locals_dict = (mp_obj_dict_t*)&pyb_spi_locals_dict,
};
|
