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micropython/ports/nrf/modules/machine/spi.c

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/*
* This file is part of the MicroPython project, http://micropython.org/
*
* The MIT License (MIT)
*
* Copyright (c) 2013, 2014 Damien P. George
* Copyright (c) 2016 - 2018 Glenn Ruben Bakke
* Copyright (c) 2018 Ayke van Laethem
*
* 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/runtime.h"
#if MICROPY_PY_MACHINE_SPI
#include "py/nlr.h"
#include "py/mphal.h"
#include "extmod/modmachine.h"
#include "pin.h"
#include "genhdr/pins.h"
#include "spi.h"
#if NRFX_SPI_ENABLED
#include "nrfx_spi.h"
#else
#include "nrfx_spim.h"
#endif
/// \moduleref machine
/// \class SPI - a controller-driven serial protocol
///
/// SPI is a serial protocol that is driven by a controller. At the physical level
/// there are 3 lines: SCK, MOSI, MISO.
///
/// See usage model of I2C; SPI is very similar. Main difference is
/// parameters to init the SPI bus:
///
/// from machine import SPI
/// spi = SPI(1, baudrate=600000, polarity=1, phase=0, crc=0x7)
///
/// Polarity can be
/// 0 or 1, and is the level the idle clock line sits at. Phase can be 0 or 1
/// to sample data on the first or second clock edge respectively. Crc can be
/// None for no CRC, or a polynomial specifier.
///
/// Additional method for SPI:
///
/// data = spi.send_recv(b'1234') # send 4 bytes and receive 4 bytes
/// buf = bytearray(4)
/// spi.send_recv(b'1234', buf) # send 4 bytes and receive 4 into buf
/// spi.send_recv(buf, buf) # send/recv 4 bytes from/to buf
#if NRFX_SPIM_ENABLED
#define nrfx_spi_t nrfx_spim_t
#define nrfx_spi_config_t nrfx_spim_config_t
#define nrfx_spi_xfer_desc_t nrfx_spim_xfer_desc_t
#define NRFX_SPI_PIN_NOT_USED NRFX_SPIM_PIN_NOT_USED
#define NRFX_SPI_INSTANCE NRFX_SPIM_INSTANCE
#define NRF_SPI_BIT_ORDER_LSB_FIRST NRF_SPIM_BIT_ORDER_LSB_FIRST
#define NRF_SPI_BIT_ORDER_MSB_FIRST NRF_SPIM_BIT_ORDER_MSB_FIRST
#define NRF_SPI_MODE_0 NRF_SPIM_MODE_0
#define NRF_SPI_MODE_1 NRF_SPIM_MODE_1
#define NRF_SPI_MODE_2 NRF_SPIM_MODE_2
#define NRF_SPI_MODE_3 NRF_SPIM_MODE_3
#define NRF_SPI_FREQ_125K NRF_SPIM_FREQ_125K
#define NRF_SPI_FREQ_250K NRF_SPIM_FREQ_250K
#define NRF_SPI_FREQ_500K NRF_SPIM_FREQ_500K
#define NRF_SPI_FREQ_1M NRF_SPIM_FREQ_1M
#define NRF_SPI_FREQ_2M NRF_SPIM_FREQ_2M
#define NRF_SPI_FREQ_4M NRF_SPIM_FREQ_4M
#define NRF_SPI_FREQ_8M NRF_SPIM_FREQ_8M
#define nrfx_spi_init nrfx_spim_init
#define nrfx_spi_uninit nrfx_spim_uninit
#define nrfx_spi_xfer nrfx_spim_xfer
#endif // NRFX_SPIM_ENABLED
typedef struct _machine_hard_spi_obj_t {
mp_obj_base_t base;
const nrfx_spi_t *p_spi; // Driver instance
nrfx_spi_config_t *p_config; // pointer to volatile part
} machine_hard_spi_obj_t;
static const nrfx_spi_t machine_spi_instances[] = {
NRFX_SPI_INSTANCE(0),
NRFX_SPI_INSTANCE(1),
#if defined(NRF52_SERIES)
NRFX_SPI_INSTANCE(2),
#if defined(NRF52840_XXAA) && NRFX_SPIM_ENABLED
NRFX_SPI_INSTANCE(3),
#endif // NRF52840_XXAA && NRFX_SPIM_ENABLED
#endif // NRF52_SERIES
};
static nrfx_spi_config_t configs[MP_ARRAY_SIZE(machine_spi_instances)];
static const machine_hard_spi_obj_t machine_hard_spi_obj[] = {
{{&machine_spi_type}, .p_spi = &machine_spi_instances[0], .p_config = &configs[0]},
{{&machine_spi_type}, .p_spi = &machine_spi_instances[1], .p_config = &configs[1]},
#if defined(NRF52_SERIES)
{{&machine_spi_type}, .p_spi = &machine_spi_instances[2], .p_config = &configs[2]},
#if defined(NRF52840_XXAA) && NRFX_SPIM_ENABLED
{{&machine_spi_type}, .p_spi = &machine_spi_instances[3], .p_config = &configs[3]},
#endif // NRF52840_XXAA && NRFX_SPIM_ENABLED
#endif // NRF52_SERIES
};
void spi_init0(void) {
}
static int spi_find(mp_obj_t id) {
if (mp_obj_is_str(id)) {
// given a string id
const char *port = mp_obj_str_get_str(id);
if (0) {
#ifdef MICROPY_HW_SPI0_NAME
} else if (strcmp(port, MICROPY_HW_SPI0_NAME) == 0) {
return 1;
#endif
}
mp_raise_ValueError(MP_ERROR_TEXT("SPI doesn't exist"));
} else {
// given an integer id
int spi_id = mp_obj_get_int(id);
if (spi_id >= 0 && spi_id < MP_ARRAY_SIZE(machine_hard_spi_obj)) {
return spi_id;
}
mp_raise_ValueError(MP_ERROR_TEXT("SPI doesn't exist"));
}
}
void spi_transfer(const machine_hard_spi_obj_t *self, size_t len, const void *src, void *dest) {
nrfx_spi_xfer_desc_t xfer_desc = {
.p_tx_buffer = src,
.tx_length = len,
.p_rx_buffer = dest,
.rx_length = len
};
nrfx_spi_xfer(self->p_spi, &xfer_desc, 0);
}
/******************************************************************************/
/* MicroPython bindings for machine API */
// for make_new
enum {
ARG_NEW_id,
ARG_NEW_baudrate,
ARG_NEW_polarity,
ARG_NEW_phase,
ARG_NEW_bits,
ARG_NEW_firstbit,
ARG_NEW_sck,
ARG_NEW_mosi,
ARG_NEW_miso
};
// for init
enum {
ARG_INIT_baudrate,
ARG_INIT_polarity,
ARG_INIT_phase,
ARG_INIT_bits,
ARG_INIT_firstbit
};
static void machine_hard_spi_init_helper(const machine_hard_spi_obj_t *self, mp_arg_val_t *args);
static void machine_hard_spi_print(const mp_print_t *print, mp_obj_t self_in, mp_print_kind_t kind) {
machine_hard_spi_obj_t *self = self_in;
mp_printf(print, "SPI(%u)", self->p_spi->drv_inst_idx);
}
static mp_obj_t machine_hard_spi_make_new(const mp_obj_type_t *type, size_t n_args, size_t n_kw, const mp_obj_t *all_args) {
static const mp_arg_t allowed_args[] = {
{ MP_QSTR_id, MP_ARG_OBJ, {.u_obj = MP_OBJ_NEW_SMALL_INT(-1)} },
{ MP_QSTR_baudrate, MP_ARG_INT, {.u_int = 1000000} },
{ MP_QSTR_polarity, MP_ARG_INT, {.u_int = 0} },
{ MP_QSTR_phase, MP_ARG_INT, {.u_int = 0} },
{ MP_QSTR_bits, MP_ARG_INT, {.u_int = 8} },
{ MP_QSTR_firstbit, MP_ARG_INT, {.u_int = 0 /* SPI_FIRSTBIT_MSB */} },
{ MP_QSTR_sck, MP_ARG_OBJ, {.u_obj = MP_OBJ_NULL} },
{ MP_QSTR_mosi, MP_ARG_OBJ, {.u_obj = MP_OBJ_NULL} },
{ MP_QSTR_miso, MP_ARG_OBJ, {.u_obj = MP_OBJ_NULL} },
};
// parse args
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);
// get static peripheral object
int spi_id = spi_find(args[ARG_NEW_id].u_obj);
const machine_hard_spi_obj_t *self = &machine_hard_spi_obj[spi_id];
// here we would check the sck/mosi/miso pins and configure them
if (args[ARG_NEW_sck].u_obj != MP_OBJ_NULL
&& args[ARG_NEW_mosi].u_obj != MP_OBJ_NULL
&& args[ARG_NEW_miso].u_obj != MP_OBJ_NULL) {
self->p_config->sck_pin = mp_hal_get_pin_obj(args[ARG_NEW_sck].u_obj)->pin;
self->p_config->mosi_pin = mp_hal_get_pin_obj(args[ARG_NEW_mosi].u_obj)->pin;
self->p_config->miso_pin = mp_hal_get_pin_obj(args[ARG_NEW_miso].u_obj)->pin;
} else {
self->p_config->sck_pin = MICROPY_HW_SPI0_SCK;
self->p_config->mosi_pin = MICROPY_HW_SPI0_MOSI;
self->p_config->miso_pin = MICROPY_HW_SPI0_MISO;
}
// Manually trigger slave select from upper layer.
self->p_config->ss_pin = NRFX_SPI_PIN_NOT_USED;
#ifdef NRF51
self->p_config->irq_priority = 3;
#else
self->p_config->irq_priority = 6;
#endif
machine_hard_spi_init_helper(self, &args[1]); // Skip instance id param.
return MP_OBJ_FROM_PTR(self);
}
static void machine_hard_spi_init_helper(const machine_hard_spi_obj_t *self, mp_arg_val_t *args) {
int baudrate = args[ARG_INIT_baudrate].u_int;
if (baudrate <= 125000) {
self->p_config->frequency = NRF_SPI_FREQ_125K;
} else if (baudrate <= 250000) {
self->p_config->frequency = NRF_SPI_FREQ_250K;
} else if (baudrate <= 500000) {
self->p_config->frequency = NRF_SPI_FREQ_500K;
} else if (baudrate <= 1000000) {
self->p_config->frequency = NRF_SPI_FREQ_1M;
} else if (baudrate <= 2000000) {
self->p_config->frequency = NRF_SPI_FREQ_2M;
} else if (baudrate <= 4000000) {
self->p_config->frequency = NRF_SPI_FREQ_4M;
} else if (baudrate <= 8000000) {
self->p_config->frequency = NRF_SPI_FREQ_8M;
#if defined(NRF52840_XXAA) && NRFX_SPIM_ENABLED
} else if (baudrate <= 16000000) {
self->p_config->frequency = NRF_SPIM_FREQ_16M;
} else if (baudrate <= 32000000) {
self->p_config->frequency = NRF_SPIM_FREQ_32M;
#endif // NRF52840_XXAA && NRFX_SPIM_ENABLED
} else { // Default
self->p_config->frequency = NRF_SPI_FREQ_1M;
}
if (args[ARG_INIT_polarity].u_int == 0) {
// Active high
if (args[ARG_INIT_phase].u_int == 0) {
// First clock edge
self->p_config->mode = NRF_SPI_MODE_0;
} else {
// Second clock edge
self->p_config->mode = NRF_SPI_MODE_1;
}
} else {
// Active low
if (args[ARG_INIT_phase].u_int == 0) {
// First clock edge
self->p_config->mode = NRF_SPI_MODE_2;
} else {
// Second clock edge
self->p_config->mode = NRF_SPI_MODE_3;
}
}
self->p_config->orc = 0xFF; // Overrun character
self->p_config->bit_order = (args[ARG_INIT_firstbit].u_int == 0) ? NRF_SPI_BIT_ORDER_MSB_FIRST : NRF_SPI_BIT_ORDER_LSB_FIRST;
// Set context to this instance of SPI
nrfx_err_t err_code = nrfx_spi_init(self->p_spi, self->p_config, NULL, (void *)self);
if (err_code == NRFX_ERROR_INVALID_STATE) {
// Instance already initialized, deinitialize first.
nrfx_spi_uninit(self->p_spi);
// Initialize again.
nrfx_spi_init(self->p_spi, self->p_config, NULL, (void *)self);
}
}
static void machine_hard_spi_init(mp_obj_base_t *self_in, size_t n_args, const mp_obj_t *pos_args, mp_map_t *kw_args) {
static const mp_arg_t allowed_args[] = {
{ MP_QSTR_baudrate, MP_ARG_KW_ONLY | MP_ARG_INT, {.u_int = 1000000} },
{ 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 = 0} },
};
// parse args
machine_hard_spi_obj_t *self = (machine_hard_spi_obj_t *)self_in;
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);
machine_hard_spi_init_helper(self, args);
}
static void machine_hard_spi_deinit(mp_obj_base_t *self_in) {
const machine_hard_spi_obj_t *self = MP_OBJ_TO_PTR(self_in);
nrfx_spi_uninit(self->p_spi);
}
static void machine_hard_spi_transfer(mp_obj_base_t *self_in, size_t len, const uint8_t *src, uint8_t *dest) {
const machine_hard_spi_obj_t *self = (machine_hard_spi_obj_t *)self_in;
spi_transfer(self, len, src, dest);
}
static const mp_machine_spi_p_t machine_hard_spi_p = {
.init = machine_hard_spi_init,
.deinit = machine_hard_spi_deinit,
.transfer = machine_hard_spi_transfer,
};
MP_DEFINE_CONST_OBJ_TYPE(
machine_spi_type,
MP_QSTR_SPI,
MP_TYPE_FLAG_NONE,
make_new, machine_hard_spi_make_new,
print, machine_hard_spi_print,
protocol, &machine_hard_spi_p,
locals_dict, &mp_machine_spi_locals_dict
);
#endif // MICROPY_PY_MACHINE_SPI
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