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micropython/extmod/machine_spi.c

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extmod: Add machine_spi with generic SPI C-protocol and helper methods. The idea is that all ports can use these helper methods and only need to provide initialisation of the SPI bus, as well as a single transfer function. The coding pattern follows the stream protocol and helper methods.
8 years ago
/*
* 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>
extmod/machine_spi: Simplify SPI xfer function to only take one buf len. There is no need to take src_len and dest_len arguments. The case of reading-only with a single output byte (originally src_len=1, dest_len&gt;1) is now handled by using the output buffer as the input buffer, and using memset to fill the output byte into this buffer. This simplifies the implementations of the spi_transfer protocol function.
8 years ago
#include <string.h>
extmod: Add machine_spi with generic SPI C-protocol and helper methods. The idea is that all ports can use these helper methods and only need to provide initialisation of the SPI bus, as well as a single transfer function. The coding pattern follows the stream protocol and helper methods.
8 years ago
#include "py/runtime.h"
#include "extmod/machine_spi.h"
#if MICROPY_PY_MACHINE_SPI
extmod/machine_spi: Provide reusable software SPI class. So long as a port defines relevant mp_hal_pin_xxx functions (and delay) it can make use of this software SPI class without the need for additional code.
8 years ago
// if a port didn't define MSB/LSB constants then provide them
#ifndef MICROPY_PY_MACHINE_SPI_MSB
#define MICROPY_PY_MACHINE_SPI_MSB (0)
#define MICROPY_PY_MACHINE_SPI_LSB (1)
#endif
extmod/machine_spi: Factor out software SPI code from esp8266 to extmod.
8 years ago
void mp_machine_soft_spi_transfer(mp_obj_base_t *self_in, size_t len, const uint8_t *src, uint8_t *dest) {
mp_machine_soft_spi_obj_t *self = (mp_machine_soft_spi_obj_t*)self_in;
extmod/machine_spi: Use delay_half, not baudrate, for internal timing. The delay_half parameter must be specified by the port to set up the timing of the software SPI. This allows the port to adjust the timing value to better suit its timing characteristics, as well as provide a more accurate printing of the baudrate.
8 years ago
uint32_t delay_half = self->delay_half;
extmod/machine_spi: Factor out software SPI code from esp8266 to extmod.
8 years ago
// only MSB transfer is implemented
extmod/machine_spi: Use delay_half, not baudrate, for internal timing. The delay_half parameter must be specified by the port to set up the timing of the software SPI. This allows the port to adjust the timing value to better suit its timing characteristics, as well as provide a more accurate printing of the baudrate.
8 years ago
extmod/machine_spi: Add optional support for fast software SPI. If a port defines MICROPY_PY_MACHINE_SPI_MIN_DELAY then it can use a faster software SPI loop that does not make calls to the delay_us function.
8 years ago
// If a port defines MICROPY_PY_MACHINE_SPI_MIN_DELAY, and the configured
// delay_half is equal to this value, then the software SPI implementation
// will run as fast as possible, limited only by CPU speed and GPIO time.
#ifdef MICROPY_PY_MACHINE_SPI_MIN_DELAY
if (delay_half == MICROPY_PY_MACHINE_SPI_MIN_DELAY) {
for (size_t i = 0; i < len; ++i) {
uint8_t data_out = src[i];
uint8_t data_in = 0;
for (int j = 0; j < 8; ++j, data_out <<= 1) {
mp_hal_pin_write(self->mosi, (data_out >> 7) & 1);
mp_hal_pin_write(self->sck, 1 - self->polarity);
data_in = (data_in << 1) | mp_hal_pin_read(self->miso);
mp_hal_pin_write(self->sck, self->polarity);
}
if (dest != NULL) {
dest[i] = data_in;
}
}
return;
}
#endif
extmod/machine_spi: Factor out software SPI code from esp8266 to extmod.
8 years ago
for (size_t i = 0; i < len; ++i) {
uint8_t data_out = src[i];
uint8_t data_in = 0;
for (int j = 0; j < 8; ++j, data_out <<= 1) {
mp_hal_pin_write(self->mosi, (data_out >> 7) & 1);
if (self->phase == 0) {
mp_hal_delay_us_fast(delay_half);
mp_hal_pin_write(self->sck, 1 - self->polarity);
} else {
mp_hal_pin_write(self->sck, 1 - self->polarity);
mp_hal_delay_us_fast(delay_half);
}
data_in = (data_in << 1) | mp_hal_pin_read(self->miso);
if (self->phase == 0) {
mp_hal_delay_us_fast(delay_half);
mp_hal_pin_write(self->sck, self->polarity);
} else {
mp_hal_pin_write(self->sck, self->polarity);
mp_hal_delay_us_fast(delay_half);
}
}
if (dest != NULL) {
dest[i] = data_in;
}
}
}
extmod/machine_spi: Provide reusable software SPI class. So long as a port defines relevant mp_hal_pin_xxx functions (and delay) it can make use of this software SPI class without the need for additional code.
8 years ago
/******************************************************************************/
// MicroPython bindings for generic machine.SPI
STATIC mp_obj_t mp_machine_soft_spi_make_new(const mp_obj_type_t *type, size_t n_args, size_t n_kw, const mp_obj_t *all_args);
mp_obj_t mp_machine_spi_make_new(const mp_obj_type_t *type, size_t n_args, size_t n_kw, const mp_obj_t *args) {
// check the id argument, if given
if (n_args > 0) {
if (args[0] != MP_OBJ_NEW_SMALL_INT(-1)) {
#if defined(MICROPY_PY_MACHINE_SPI_MAKE_NEW)
// dispatch to port-specific constructor
extern mp_obj_t MICROPY_PY_MACHINE_SPI_MAKE_NEW(const mp_obj_type_t *type, size_t n_args, size_t n_kw, const mp_obj_t *all_args);
return MICROPY_PY_MACHINE_SPI_MAKE_NEW(type, n_args, n_kw, args);
#else
mp_raise_ValueError("invalid SPI peripheral");
#endif
}
--n_args;
++args;
}
// software SPI
return mp_machine_soft_spi_make_new(type, n_args, n_kw, args);
}
STATIC mp_obj_t machine_spi_init(size_t n_args, const mp_obj_t *args, mp_map_t *kw_args) {
mp_obj_base_t *s = (mp_obj_base_t*)MP_OBJ_TO_PTR(args[0]);
mp_machine_spi_p_t *spi_p = (mp_machine_spi_p_t*)s->type->protocol;
spi_p->init(s, n_args - 1, args + 1, kw_args);
return mp_const_none;
}
STATIC MP_DEFINE_CONST_FUN_OBJ_KW(machine_spi_init_obj, 1, machine_spi_init);
STATIC mp_obj_t machine_spi_deinit(mp_obj_t self) {
mp_obj_base_t *s = (mp_obj_base_t*)MP_OBJ_TO_PTR(self);
mp_machine_spi_p_t *spi_p = (mp_machine_spi_p_t*)s->type->protocol;
if (spi_p->deinit != NULL) {
spi_p->deinit(s);
}
return mp_const_none;
}
STATIC MP_DEFINE_CONST_FUN_OBJ_1(machine_spi_deinit_obj, machine_spi_deinit);
extmod/machine_spi: Simplify SPI xfer function to only take one buf len. There is no need to take src_len and dest_len arguments. The case of reading-only with a single output byte (originally src_len=1, dest_len&gt;1) is now handled by using the output buffer as the input buffer, and using memset to fill the output byte into this buffer. This simplifies the implementations of the spi_transfer protocol function.
8 years ago
STATIC void mp_machine_spi_transfer(mp_obj_t self, size_t len, const void *src, void *dest) {
extmod: Add machine_spi with generic SPI C-protocol and helper methods. The idea is that all ports can use these helper methods and only need to provide initialisation of the SPI bus, as well as a single transfer function. The coding pattern follows the stream protocol and helper methods.
8 years ago
mp_obj_base_t *s = (mp_obj_base_t*)MP_OBJ_TO_PTR(self);
mp_machine_spi_p_t *spi_p = (mp_machine_spi_p_t*)s->type->protocol;
extmod/machine_spi: Simplify SPI xfer function to only take one buf len. There is no need to take src_len and dest_len arguments. The case of reading-only with a single output byte (originally src_len=1, dest_len&gt;1) is now handled by using the output buffer as the input buffer, and using memset to fill the output byte into this buffer. This simplifies the implementations of the spi_transfer protocol function.
8 years ago
spi_p->transfer(s, len, src, dest);
extmod: Add machine_spi with generic SPI C-protocol and helper methods. The idea is that all ports can use these helper methods and only need to provide initialisation of the SPI bus, as well as a single transfer function. The coding pattern follows the stream protocol and helper methods.
8 years ago
}
STATIC mp_obj_t mp_machine_spi_read(size_t n_args, const mp_obj_t *args) {
vstr_t vstr;
vstr_init_len(&vstr, mp_obj_get_int(args[1]));
extmod/machine_spi: Simplify SPI xfer function to only take one buf len. There is no need to take src_len and dest_len arguments. The case of reading-only with a single output byte (originally src_len=1, dest_len&gt;1) is now handled by using the output buffer as the input buffer, and using memset to fill the output byte into this buffer. This simplifies the implementations of the spi_transfer protocol function.
8 years ago
memset(vstr.buf, n_args == 3 ? mp_obj_get_int(args[2]) : 0, vstr.len);
mp_machine_spi_transfer(args[0], vstr.len, vstr.buf, vstr.buf);
extmod: Add machine_spi with generic SPI C-protocol and helper methods. The idea is that all ports can use these helper methods and only need to provide initialisation of the SPI bus, as well as a single transfer function. The coding pattern follows the stream protocol and helper methods.
8 years ago
return mp_obj_new_str_from_vstr(&mp_type_bytes, &vstr);
}
MP_DEFINE_CONST_FUN_OBJ_VAR_BETWEEN(mp_machine_spi_read_obj, 2, 3, mp_machine_spi_read);
STATIC mp_obj_t mp_machine_spi_readinto(size_t n_args, const mp_obj_t *args) {
mp_buffer_info_t bufinfo;
mp_get_buffer_raise(args[1], &bufinfo, MP_BUFFER_WRITE);
extmod/machine_spi: Simplify SPI xfer function to only take one buf len. There is no need to take src_len and dest_len arguments. The case of reading-only with a single output byte (originally src_len=1, dest_len&gt;1) is now handled by using the output buffer as the input buffer, and using memset to fill the output byte into this buffer. This simplifies the implementations of the spi_transfer protocol function.
8 years ago
memset(bufinfo.buf, n_args == 3 ? mp_obj_get_int(args[2]) : 0, bufinfo.len);
mp_machine_spi_transfer(args[0], bufinfo.len, bufinfo.buf, bufinfo.buf);
extmod: Add machine_spi with generic SPI C-protocol and helper methods. The idea is that all ports can use these helper methods and only need to provide initialisation of the SPI bus, as well as a single transfer function. The coding pattern follows the stream protocol and helper methods.
8 years ago
return mp_const_none;
}
MP_DEFINE_CONST_FUN_OBJ_VAR_BETWEEN(mp_machine_spi_readinto_obj, 2, 3, mp_machine_spi_readinto);
STATIC mp_obj_t mp_machine_spi_write(mp_obj_t self, mp_obj_t wr_buf) {
mp_buffer_info_t src;
mp_get_buffer_raise(wr_buf, &src, MP_BUFFER_READ);
extmod/machine_spi: Simplify SPI xfer function to only take one buf len. There is no need to take src_len and dest_len arguments. The case of reading-only with a single output byte (originally src_len=1, dest_len&gt;1) is now handled by using the output buffer as the input buffer, and using memset to fill the output byte into this buffer. This simplifies the implementations of the spi_transfer protocol function.
8 years ago
mp_machine_spi_transfer(self, src.len, (const uint8_t*)src.buf, NULL);
extmod: Add machine_spi with generic SPI C-protocol and helper methods. The idea is that all ports can use these helper methods and only need to provide initialisation of the SPI bus, as well as a single transfer function. The coding pattern follows the stream protocol and helper methods.
8 years ago
return mp_const_none;
}
MP_DEFINE_CONST_FUN_OBJ_2(mp_machine_spi_write_obj, mp_machine_spi_write);
STATIC mp_obj_t mp_machine_spi_write_readinto(mp_obj_t self, mp_obj_t wr_buf, mp_obj_t rd_buf) {
mp_buffer_info_t src;
mp_get_buffer_raise(wr_buf, &src, MP_BUFFER_READ);
mp_buffer_info_t dest;
mp_get_buffer_raise(rd_buf, &dest, MP_BUFFER_WRITE);
if (src.len != dest.len) {
extmod/machine_spi: Simplify SPI xfer function to only take one buf len. There is no need to take src_len and dest_len arguments. The case of reading-only with a single output byte (originally src_len=1, dest_len&gt;1) is now handled by using the output buffer as the input buffer, and using memset to fill the output byte into this buffer. This simplifies the implementations of the spi_transfer protocol function.
8 years ago
mp_raise_ValueError("buffers must be the same length");
extmod: Add machine_spi with generic SPI C-protocol and helper methods. The idea is that all ports can use these helper methods and only need to provide initialisation of the SPI bus, as well as a single transfer function. The coding pattern follows the stream protocol and helper methods.
8 years ago
}
extmod/machine_spi: Simplify SPI xfer function to only take one buf len. There is no need to take src_len and dest_len arguments. The case of reading-only with a single output byte (originally src_len=1, dest_len&gt;1) is now handled by using the output buffer as the input buffer, and using memset to fill the output byte into this buffer. This simplifies the implementations of the spi_transfer protocol function.
8 years ago
mp_machine_spi_transfer(self, src.len, src.buf, dest.buf);
extmod: Add machine_spi with generic SPI C-protocol and helper methods. The idea is that all ports can use these helper methods and only need to provide initialisation of the SPI bus, as well as a single transfer function. The coding pattern follows the stream protocol and helper methods.
8 years ago
return mp_const_none;
}
MP_DEFINE_CONST_FUN_OBJ_3(mp_machine_spi_write_readinto_obj, mp_machine_spi_write_readinto);
extmod/machine_spi: Provide reusable software SPI class. So long as a port defines relevant mp_hal_pin_xxx functions (and delay) it can make use of this software SPI class without the need for additional code.
8 years ago
STATIC const mp_rom_map_elem_t machine_spi_locals_dict_table[] = {
{ MP_ROM_QSTR(MP_QSTR_init), MP_ROM_PTR(&machine_spi_init_obj) },
{ MP_ROM_QSTR(MP_QSTR_deinit), MP_ROM_PTR(&machine_spi_deinit_obj) },
{ MP_ROM_QSTR(MP_QSTR_read), MP_ROM_PTR(&mp_machine_spi_read_obj) },
{ MP_ROM_QSTR(MP_QSTR_readinto), MP_ROM_PTR(&mp_machine_spi_readinto_obj) },
{ MP_ROM_QSTR(MP_QSTR_write), MP_ROM_PTR(&mp_machine_spi_write_obj) },
{ MP_ROM_QSTR(MP_QSTR_write_readinto), MP_ROM_PTR(&mp_machine_spi_write_readinto_obj) },
{ MP_ROM_QSTR(MP_QSTR_MSB), MP_ROM_INT(MICROPY_PY_MACHINE_SPI_MSB) },
{ MP_ROM_QSTR(MP_QSTR_LSB), MP_ROM_INT(MICROPY_PY_MACHINE_SPI_LSB) },
};
MP_DEFINE_CONST_DICT(mp_machine_spi_locals_dict, machine_spi_locals_dict_table);
/******************************************************************************/
// Implementation of soft SPI
STATIC uint32_t baudrate_from_delay_half(uint32_t delay_half) {
#ifdef MICROPY_PY_MACHINE_SPI_MIN_DELAY
if (delay_half == MICROPY_PY_MACHINE_SPI_MIN_DELAY) {
return MICROPY_PY_MACHINE_SPI_MAX_BAUDRATE;
} else
#endif
{
return 500000 / delay_half;
}
}
STATIC uint32_t baudrate_to_delay_half(uint32_t baudrate) {
#ifdef MICROPY_PY_MACHINE_SPI_MIN_DELAY
if (baudrate >= MICROPY_PY_MACHINE_SPI_MAX_BAUDRATE) {
return MICROPY_PY_MACHINE_SPI_MIN_DELAY;
} else
#endif
{
uint32_t delay_half = 500000 / baudrate;
// round delay_half up so that: actual_baudrate <= requested_baudrate
if (500000 % baudrate != 0) {
delay_half += 1;
}
return delay_half;
}
}
STATIC void mp_machine_soft_spi_print(const mp_print_t *print, mp_obj_t self_in, mp_print_kind_t kind) {
mp_machine_soft_spi_obj_t *self = MP_OBJ_TO_PTR(self_in);
mp_printf(print, "SoftSPI(baudrate=%u, polarity=%u, phase=%u,"
" sck=" MP_HAL_PIN_FMT ", mosi=" MP_HAL_PIN_FMT ", miso=" MP_HAL_PIN_FMT ")",
baudrate_from_delay_half(self->delay_half), self->polarity, self->phase,
mp_hal_pin_name(self->sck), mp_hal_pin_name(self->mosi), mp_hal_pin_name(self->miso));
}
STATIC mp_obj_t mp_machine_soft_spi_make_new(const mp_obj_type_t *type, size_t n_args, size_t n_kw, const mp_obj_t *all_args) {
enum { ARG_baudrate, ARG_polarity, ARG_phase, ARG_bits, ARG_firstbit, ARG_sck, ARG_mosi, ARG_miso };
static const mp_arg_t allowed_args[] = {
{ MP_QSTR_baudrate, MP_ARG_INT, {.u_int = 500000} },
{ MP_QSTR_polarity, MP_ARG_KW_ONLY | MP_ARG_INT, {.u_int = 0} },
{ MP_QSTR_phase, MP_ARG_KW_ONLY | MP_ARG_INT, {.u_int = 0} },
{ MP_QSTR_bits, MP_ARG_KW_ONLY | MP_ARG_INT, {.u_int = 8} },
{ MP_QSTR_firstbit, MP_ARG_KW_ONLY | MP_ARG_INT, {.u_int = MICROPY_PY_MACHINE_SPI_MSB} },
{ 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_kw_array(n_args, n_kw, all_args, MP_ARRAY_SIZE(allowed_args), allowed_args, args);
// create new object
mp_machine_soft_spi_obj_t *self = m_new_obj(mp_machine_soft_spi_obj_t);
self->base.type = &mp_machine_soft_spi_type;
// set parameters
self->delay_half = baudrate_to_delay_half(args[ARG_baudrate].u_int);
self->polarity = args[ARG_polarity].u_int;
self->phase = args[ARG_phase].u_int;
if (args[ARG_bits].u_int != 8) {
mp_raise_ValueError("bits must be 8");
}
if (args[ARG_firstbit].u_int != MICROPY_PY_MACHINE_SPI_MSB) {
mp_raise_ValueError("firstbit must be MSB");
}
if (args[ARG_sck].u_obj == MP_OBJ_NULL
|| args[ARG_mosi].u_obj == MP_OBJ_NULL
|| args[ARG_miso].u_obj == MP_OBJ_NULL) {
mp_raise_ValueError("must specify all of sck/mosi/miso");
}
self->sck = mp_hal_get_pin_obj(args[ARG_sck].u_obj);
self->mosi = mp_hal_get_pin_obj(args[ARG_mosi].u_obj);
self->miso = mp_hal_get_pin_obj(args[ARG_miso].u_obj);
// configure pins
mp_hal_pin_write(self->sck, self->polarity);
mp_hal_pin_output(self->sck);
mp_hal_pin_output(self->mosi);
mp_hal_pin_input(self->miso);
return MP_OBJ_FROM_PTR(self);
}
STATIC void mp_machine_soft_spi_init(mp_obj_base_t *self_in, size_t n_args, const mp_obj_t *pos_args, mp_map_t *kw_args) {
mp_machine_soft_spi_obj_t *self = (mp_machine_soft_spi_obj_t*)self_in;
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->delay_half = baudrate_to_delay_half(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_hal_get_pin_obj(args[ARG_sck].u_obj);
}
if (args[ARG_mosi].u_obj != MP_OBJ_NULL) {
self->mosi = mp_hal_get_pin_obj(args[ARG_mosi].u_obj);
}
if (args[ARG_miso].u_obj != MP_OBJ_NULL) {
self->miso = mp_hal_get_pin_obj(args[ARG_miso].u_obj);
}
// configure pins
mp_hal_pin_write(self->sck, self->polarity);
mp_hal_pin_output(self->sck);
mp_hal_pin_output(self->mosi);
mp_hal_pin_input(self->miso);
}
STATIC const mp_machine_spi_p_t mp_machine_soft_spi_p = {
.init = mp_machine_soft_spi_init,
.deinit = NULL,
.transfer = mp_machine_soft_spi_transfer,
};
const mp_obj_type_t mp_machine_soft_spi_type = {
{ &mp_type_type },
.name = MP_QSTR_SoftSPI,
.print = mp_machine_soft_spi_print,
.make_new = mp_machine_spi_make_new, // delegate to master constructor
.protocol = &mp_machine_soft_spi_p,
.locals_dict = (mp_obj_dict_t*)&mp_machine_spi_locals_dict,
};
extmod: Add machine_spi with generic SPI C-protocol and helper methods. The idea is that all ports can use these helper methods and only need to provide initialisation of the SPI bus, as well as a single transfer function. The coding pattern follows the stream protocol and helper methods.
8 years ago
#endif // MICROPY_PY_MACHINE_SPI