358 lines
14 KiB
C
358 lines
14 KiB
C
/*
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* This file is part of the MicroPython project, http://micropython.org/
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*
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* The MIT License (MIT)
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*
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* Copyright (c) 2013-2018 Damien P. George
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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* THE SOFTWARE.
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*/
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#include "py/runtime.h"
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#include "extmod/machine_spi.h"
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#include "bufhelper.h"
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#include "spi.h"
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/******************************************************************************/
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// MicroPython bindings for legacy pyb API
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// class pyb.SPI - a master-driven serial protocol
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//
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// SPI is a serial protocol that is driven by a master. At the physical level
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// there are 3 lines: SCK, MOSI, MISO.
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//
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// See usage model of I2C; SPI is very similar. Main difference is
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// parameters to init the SPI bus:
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//
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// from pyb import SPI
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// spi = SPI(1, SPI.MASTER, baudrate=600000, polarity=1, phase=0, crc=0x7)
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//
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// Only required parameter is mode, SPI.MASTER or SPI.SLAVE. Polarity can be
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// 0 or 1, and is the level the idle clock line sits at. Phase can be 0 or 1
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// to sample data on the first or second clock edge respectively. Crc can be
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// None for no CRC, or a polynomial specifier.
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//
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// Additional method for SPI:
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//
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// data = spi.send_recv(b'1234') # send 4 bytes and receive 4 bytes
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// buf = bytearray(4)
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// spi.send_recv(b'1234', buf) # send 4 bytes and receive 4 into buf
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// spi.send_recv(buf, buf) # send/recv 4 bytes from/to buf
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STATIC const pyb_spi_obj_t pyb_spi_obj[] = {
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{{&pyb_spi_type}, &spi_obj[0]},
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{{&pyb_spi_type}, &spi_obj[1]},
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{{&pyb_spi_type}, &spi_obj[2]},
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{{&pyb_spi_type}, &spi_obj[3]},
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{{&pyb_spi_type}, &spi_obj[4]},
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{{&pyb_spi_type}, &spi_obj[5]},
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};
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STATIC void pyb_spi_print(const mp_print_t *print, mp_obj_t self_in, mp_print_kind_t kind) {
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pyb_spi_obj_t *self = MP_OBJ_TO_PTR(self_in);
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spi_print(print, self->spi, true);
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}
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// init(mode, baudrate=328125, *, polarity=1, phase=0, bits=8, firstbit=SPI.MSB, ti=False, crc=None)
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//
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// Initialise the SPI bus with the given parameters:
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// - `mode` must be either `SPI.MASTER` or `SPI.SLAVE`.
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// - `baudrate` is the SCK clock rate (only sensible for a master).
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STATIC mp_obj_t pyb_spi_init_helper(const pyb_spi_obj_t *self, size_t n_args, const mp_obj_t *pos_args, mp_map_t *kw_args) {
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static const mp_arg_t allowed_args[] = {
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{ MP_QSTR_mode, MP_ARG_REQUIRED | MP_ARG_INT, {.u_int = 0} },
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{ MP_QSTR_baudrate, MP_ARG_INT, {.u_int = 328125} },
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{ MP_QSTR_prescaler, MP_ARG_KW_ONLY | MP_ARG_INT, {.u_int = 0xffffffff} },
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{ MP_QSTR_polarity, MP_ARG_KW_ONLY | MP_ARG_INT, {.u_int = 1} },
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{ MP_QSTR_phase, MP_ARG_KW_ONLY | MP_ARG_INT, {.u_int = 0} },
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{ MP_QSTR_dir, MP_ARG_KW_ONLY | MP_ARG_INT, {.u_int = SPI_DIRECTION_2LINES} },
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{ MP_QSTR_bits, MP_ARG_KW_ONLY | MP_ARG_INT, {.u_int = 8} },
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{ MP_QSTR_nss, MP_ARG_KW_ONLY | MP_ARG_INT, {.u_int = SPI_NSS_SOFT} },
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{ MP_QSTR_firstbit, MP_ARG_KW_ONLY | MP_ARG_INT, {.u_int = SPI_FIRSTBIT_MSB} },
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{ MP_QSTR_ti, MP_ARG_KW_ONLY | MP_ARG_BOOL, {.u_bool = false} },
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{ MP_QSTR_crc, MP_ARG_KW_ONLY | MP_ARG_OBJ, {.u_rom_obj = MP_ROM_NONE} },
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};
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// parse args
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mp_arg_val_t args[MP_ARRAY_SIZE(allowed_args)];
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mp_arg_parse_all(n_args, pos_args, kw_args, MP_ARRAY_SIZE(allowed_args), allowed_args, args);
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// set the SPI configuration values
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SPI_InitTypeDef *init = &self->spi->spi->Init;
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init->Mode = args[0].u_int;
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spi_set_params(self->spi, args[2].u_int, args[1].u_int, args[3].u_int, args[4].u_int,
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args[6].u_int, args[8].u_int);
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init->Direction = args[5].u_int;
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init->NSS = args[7].u_int;
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init->TIMode = args[9].u_bool ? SPI_TIMODE_ENABLE : SPI_TIMODE_DISABLE;
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if (args[10].u_obj == mp_const_none) {
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init->CRCCalculation = SPI_CRCCALCULATION_DISABLE;
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init->CRCPolynomial = 0;
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} else {
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init->CRCCalculation = SPI_CRCCALCULATION_ENABLE;
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init->CRCPolynomial = mp_obj_get_int(args[10].u_obj);
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}
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// init the SPI bus
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spi_init(self->spi, init->NSS != SPI_NSS_SOFT);
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return mp_const_none;
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}
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// constructor(bus, ...)
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//
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// Construct an SPI object on the given bus. `bus` can be 1 or 2.
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// With no additional parameters, the SPI object is created but not
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// initialised (it has the settings from the last initialisation of
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// the bus, if any). If extra arguments are given, the bus is initialised.
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// See `init` for parameters of initialisation.
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//
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// The physical pins of the SPI buses are:
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// - `SPI(1)` is on the X position: `(NSS, SCK, MISO, MOSI) = (X5, X6, X7, X8) = (PA4, PA5, PA6, PA7)`
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// - `SPI(2)` is on the Y position: `(NSS, SCK, MISO, MOSI) = (Y5, Y6, Y7, Y8) = (PB12, PB13, PB14, PB15)`
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//
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// At the moment, the NSS pin is not used by the SPI driver and is free
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// for other use.
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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) {
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// check arguments
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mp_arg_check_num(n_args, n_kw, 1, MP_OBJ_FUN_ARGS_MAX, true);
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// work out SPI bus
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int spi_id = spi_find_index(args[0]);
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// get SPI object
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const pyb_spi_obj_t *spi_obj = &pyb_spi_obj[spi_id - 1];
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if (n_args > 1 || n_kw > 0) {
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// start the peripheral
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mp_map_t kw_args;
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mp_map_init_fixed_table(&kw_args, n_kw, args + n_args);
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pyb_spi_init_helper(spi_obj, n_args - 1, args + 1, &kw_args);
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}
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return MP_OBJ_FROM_PTR(spi_obj);
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}
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STATIC mp_obj_t pyb_spi_init(size_t n_args, const mp_obj_t *args, mp_map_t *kw_args) {
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return pyb_spi_init_helper(MP_OBJ_TO_PTR(args[0]), n_args - 1, args + 1, kw_args);
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}
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STATIC MP_DEFINE_CONST_FUN_OBJ_KW(pyb_spi_init_obj, 1, pyb_spi_init);
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// deinit()
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// Turn off the SPI bus.
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STATIC mp_obj_t pyb_spi_deinit(mp_obj_t self_in) {
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pyb_spi_obj_t *self = MP_OBJ_TO_PTR(self_in);
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spi_deinit(self->spi);
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return mp_const_none;
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}
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STATIC MP_DEFINE_CONST_FUN_OBJ_1(pyb_spi_deinit_obj, pyb_spi_deinit);
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// send(send, *, timeout=5000)
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// Send data on the bus:
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// - `send` is the data to send (an integer to send, or a buffer object).
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// - `timeout` is the timeout in milliseconds to wait for the send.
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//
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// Return value: `None`.
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STATIC mp_obj_t pyb_spi_send(size_t n_args, const mp_obj_t *pos_args, mp_map_t *kw_args) {
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// TODO assumes transmission size is 8-bits wide
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static const mp_arg_t allowed_args[] = {
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{ MP_QSTR_send, MP_ARG_REQUIRED | MP_ARG_OBJ, {.u_obj = MP_OBJ_NULL} },
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{ MP_QSTR_timeout, MP_ARG_KW_ONLY | MP_ARG_INT, {.u_int = 5000} },
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};
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// parse args
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pyb_spi_obj_t *self = MP_OBJ_TO_PTR(pos_args[0]);
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mp_arg_val_t args[MP_ARRAY_SIZE(allowed_args)];
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mp_arg_parse_all(n_args - 1, pos_args + 1, kw_args, MP_ARRAY_SIZE(allowed_args), allowed_args, args);
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// get the buffer to send from
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mp_buffer_info_t bufinfo;
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uint8_t data[1];
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pyb_buf_get_for_send(args[0].u_obj, &bufinfo, data);
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// send the data
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spi_transfer(self->spi, bufinfo.len, bufinfo.buf, NULL, args[1].u_int);
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return mp_const_none;
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}
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STATIC MP_DEFINE_CONST_FUN_OBJ_KW(pyb_spi_send_obj, 1, pyb_spi_send);
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// recv(recv, *, timeout=5000)
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//
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// Receive data on the bus:
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// - `recv` can be an integer, which is the number of bytes to receive,
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// or a mutable buffer, which will be filled with received bytes.
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// - `timeout` is the timeout in milliseconds to wait for the receive.
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//
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// Return value: if `recv` is an integer then a new buffer of the bytes received,
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// otherwise the same buffer that was passed in to `recv`.
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STATIC mp_obj_t pyb_spi_recv(size_t n_args, const mp_obj_t *pos_args, mp_map_t *kw_args) {
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// TODO assumes transmission size is 8-bits wide
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static const mp_arg_t allowed_args[] = {
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{ MP_QSTR_recv, MP_ARG_REQUIRED | MP_ARG_OBJ, {.u_obj = MP_OBJ_NULL} },
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{ MP_QSTR_timeout, MP_ARG_KW_ONLY | MP_ARG_INT, {.u_int = 5000} },
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};
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// parse args
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pyb_spi_obj_t *self = MP_OBJ_TO_PTR(pos_args[0]);
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mp_arg_val_t args[MP_ARRAY_SIZE(allowed_args)];
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mp_arg_parse_all(n_args - 1, pos_args + 1, kw_args, MP_ARRAY_SIZE(allowed_args), allowed_args, args);
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// get the buffer to receive into
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vstr_t vstr;
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mp_obj_t o_ret = pyb_buf_get_for_recv(args[0].u_obj, &vstr);
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// receive the data
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spi_transfer(self->spi, vstr.len, NULL, (uint8_t *)vstr.buf, args[1].u_int);
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// return the received data
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if (o_ret != MP_OBJ_NULL) {
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return o_ret;
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} else {
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return mp_obj_new_str_from_vstr(&mp_type_bytes, &vstr);
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}
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}
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STATIC MP_DEFINE_CONST_FUN_OBJ_KW(pyb_spi_recv_obj, 1, pyb_spi_recv);
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// send_recv(send, recv=None, *, timeout=5000)
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//
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// Send and receive data on the bus at the same time:
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// - `send` is the data to send (an integer to send, or a buffer object).
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// - `recv` is a mutable buffer which will be filled with received bytes.
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// It can be the same as `send`, or omitted. If omitted, a new buffer will
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// be created.
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// - `timeout` is the timeout in milliseconds to wait for the receive.
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//
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// Return value: the buffer with the received bytes.
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STATIC mp_obj_t pyb_spi_send_recv(size_t n_args, const mp_obj_t *pos_args, mp_map_t *kw_args) {
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// TODO assumes transmission size is 8-bits wide
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static const mp_arg_t allowed_args[] = {
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{ MP_QSTR_send, MP_ARG_REQUIRED | MP_ARG_OBJ, {.u_obj = MP_OBJ_NULL} },
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{ MP_QSTR_recv, MP_ARG_OBJ, {.u_obj = MP_OBJ_NULL} },
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{ MP_QSTR_timeout, MP_ARG_KW_ONLY | MP_ARG_INT, {.u_int = 5000} },
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};
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// parse args
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pyb_spi_obj_t *self = MP_OBJ_TO_PTR(pos_args[0]);
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mp_arg_val_t args[MP_ARRAY_SIZE(allowed_args)];
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mp_arg_parse_all(n_args - 1, pos_args + 1, kw_args, MP_ARRAY_SIZE(allowed_args), allowed_args, args);
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// get buffers to send from/receive to
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mp_buffer_info_t bufinfo_send;
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uint8_t data_send[1];
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mp_buffer_info_t bufinfo_recv;
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vstr_t vstr_recv;
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mp_obj_t o_ret;
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if (args[0].u_obj == args[1].u_obj) {
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// same object for send and receive, it must be a r/w buffer
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mp_get_buffer_raise(args[0].u_obj, &bufinfo_send, MP_BUFFER_RW);
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bufinfo_recv = bufinfo_send;
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o_ret = args[0].u_obj;
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} else {
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// get the buffer to send from
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pyb_buf_get_for_send(args[0].u_obj, &bufinfo_send, data_send);
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// get the buffer to receive into
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if (args[1].u_obj == MP_OBJ_NULL) {
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// only send argument given, so create a fresh buffer of the send length
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vstr_init_len(&vstr_recv, bufinfo_send.len);
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bufinfo_recv.len = vstr_recv.len;
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bufinfo_recv.buf = vstr_recv.buf;
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o_ret = MP_OBJ_NULL;
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} else {
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// recv argument given
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mp_get_buffer_raise(args[1].u_obj, &bufinfo_recv, MP_BUFFER_WRITE);
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if (bufinfo_recv.len != bufinfo_send.len) {
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mp_raise_ValueError(MP_ERROR_TEXT("recv must be same length as send"));
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}
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o_ret = args[1].u_obj;
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}
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}
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// do the transfer
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spi_transfer(self->spi, bufinfo_send.len, bufinfo_send.buf, bufinfo_recv.buf, args[2].u_int);
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// return the received data
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if (o_ret != MP_OBJ_NULL) {
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return o_ret;
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} else {
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return mp_obj_new_str_from_vstr(&mp_type_bytes, &vstr_recv);
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}
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}
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STATIC MP_DEFINE_CONST_FUN_OBJ_KW(pyb_spi_send_recv_obj, 1, pyb_spi_send_recv);
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STATIC const mp_rom_map_elem_t pyb_spi_locals_dict_table[] = {
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// instance methods
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{ MP_ROM_QSTR(MP_QSTR_init), MP_ROM_PTR(&pyb_spi_init_obj) },
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{ MP_ROM_QSTR(MP_QSTR_deinit), MP_ROM_PTR(&pyb_spi_deinit_obj) },
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{ MP_ROM_QSTR(MP_QSTR_read), MP_ROM_PTR(&mp_machine_spi_read_obj) },
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{ MP_ROM_QSTR(MP_QSTR_readinto), MP_ROM_PTR(&mp_machine_spi_readinto_obj) },
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{ MP_ROM_QSTR(MP_QSTR_write), MP_ROM_PTR(&mp_machine_spi_write_obj) },
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{ MP_ROM_QSTR(MP_QSTR_write_readinto), MP_ROM_PTR(&mp_machine_spi_write_readinto_obj) },
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// legacy methods
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{ MP_ROM_QSTR(MP_QSTR_send), MP_ROM_PTR(&pyb_spi_send_obj) },
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{ MP_ROM_QSTR(MP_QSTR_recv), MP_ROM_PTR(&pyb_spi_recv_obj) },
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{ MP_ROM_QSTR(MP_QSTR_send_recv), MP_ROM_PTR(&pyb_spi_send_recv_obj) },
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// class constants
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/// \constant MASTER - for initialising the bus to master mode
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/// \constant SLAVE - for initialising the bus to slave mode
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/// \constant MSB - set the first bit to MSB
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/// \constant LSB - set the first bit to LSB
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{ MP_ROM_QSTR(MP_QSTR_MASTER), MP_ROM_INT(SPI_MODE_MASTER) },
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{ MP_ROM_QSTR(MP_QSTR_SLAVE), MP_ROM_INT(SPI_MODE_SLAVE) },
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{ MP_ROM_QSTR(MP_QSTR_MSB), MP_ROM_INT(SPI_FIRSTBIT_MSB) },
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{ MP_ROM_QSTR(MP_QSTR_LSB), MP_ROM_INT(SPI_FIRSTBIT_LSB) },
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/* TODO
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{ MP_ROM_QSTR(MP_QSTR_DIRECTION_2LINES ((uint32_t)0x00000000)
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{ MP_ROM_QSTR(MP_QSTR_DIRECTION_2LINES_RXONLY SPI_CR1_RXONLY
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{ MP_ROM_QSTR(MP_QSTR_DIRECTION_1LINE SPI_CR1_BIDIMODE
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{ MP_ROM_QSTR(MP_QSTR_NSS_SOFT SPI_CR1_SSM
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{ MP_ROM_QSTR(MP_QSTR_NSS_HARD_INPUT ((uint32_t)0x00000000)
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{ MP_ROM_QSTR(MP_QSTR_NSS_HARD_OUTPUT ((uint32_t)0x00040000)
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*/
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};
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STATIC MP_DEFINE_CONST_DICT(pyb_spi_locals_dict, pyb_spi_locals_dict_table);
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STATIC void spi_transfer_machine(mp_obj_base_t *self_in, size_t len, const uint8_t *src, uint8_t *dest) {
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pyb_spi_obj_t *self = (pyb_spi_obj_t *)self_in;
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spi_transfer(self->spi, len, src, dest, SPI_TRANSFER_TIMEOUT(len));
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}
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STATIC const mp_machine_spi_p_t pyb_spi_p = {
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.transfer = spi_transfer_machine,
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};
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const mp_obj_type_t pyb_spi_type = {
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{ &mp_type_type },
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.name = MP_QSTR_SPI,
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.print = pyb_spi_print,
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.make_new = pyb_spi_make_new,
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.protocol = &pyb_spi_p,
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.locals_dict = (mp_obj_dict_t *)&pyb_spi_locals_dict,
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};
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