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drivers/bus: Pull out software SPI implementation to dedicated driver.

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This patch takes the software SPI implementation from extmod/machine_spi.c
and moves it to a dedicated file in drivers/bus/softspi.c.  This allows the
SPI driver to be used independently of the uPy runtime, making it a more
general component.
This commit is contained in:
Damien George 2018-03-09 17:25:58 +11:00
parent ad2a6e538c
commit 58ebeca6a9
11 changed files with 202 additions and 98 deletions
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105
drivers/bus/softspi.c Normal file
View File

@ -0,0 +1,105 @@
/*
* This file is part of the MicroPython project, http://micropython.org/
*
* The MIT License (MIT)
*
* Copyright (c) 2016-2018 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 "drivers/bus/spi.h"
int mp_soft_spi_ioctl(void *self_in, uint32_t cmd) {
mp_soft_spi_obj_t *self = (mp_soft_spi_obj_t*)self_in;
switch (cmd) {
case MP_SPI_IOCTL_INIT:
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);
break;
case MP_SPI_IOCTL_DEINIT:
break;
}
return 0;
}
void mp_soft_spi_transfer(void *self_in, size_t len, const uint8_t *src, uint8_t *dest) {
mp_soft_spi_obj_t *self = (mp_soft_spi_obj_t*)self_in;
uint32_t delay_half = self->delay_half;
// only MSB transfer is implemented
// If a port defines MICROPY_HW_SOFTSPI_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_HW_SOFTSPI_MIN_DELAY
if (delay_half == MICROPY_HW_SOFTSPI_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
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;
}
}
}
const mp_spi_proto_t mp_soft_spi_proto = {
.ioctl = mp_soft_spi_ioctl,
.transfer = mp_soft_spi_transfer,
};

55
drivers/bus/spi.h Normal file
View File

@ -0,0 +1,55 @@
/*
* This file is part of the MicroPython project, http://micropython.org/
*
* The MIT License (MIT)
*
* Copyright (c) 2016-2018 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.
*/
#ifndef MICROPY_INCLUDED_DRIVERS_BUS_SPI_H
#define MICROPY_INCLUDED_DRIVERS_BUS_SPI_H
#include "py/mphal.h"
enum {
MP_SPI_IOCTL_INIT,
MP_SPI_IOCTL_DEINIT,
};
typedef struct _mp_spi_proto_t {
int (*ioctl)(void *self, uint32_t cmd);
void (*transfer)(void *self, size_t len, const uint8_t *src, uint8_t *dest);
} mp_spi_proto_t;
typedef struct _mp_soft_spi_obj_t {
uint32_t delay_half; // microsecond delay for half SCK period
uint8_t polarity;
uint8_t phase;
mp_hal_pin_obj_t sck;
mp_hal_pin_obj_t mosi;
mp_hal_pin_obj_t miso;
} mp_soft_spi_obj_t;
extern const mp_spi_proto_t mp_soft_spi_proto;
int mp_soft_spi_ioctl(void *self, uint32_t cmd);
void mp_soft_spi_transfer(void *self, size_t len, const uint8_t *src, uint8_t *dest);
#endif // MICROPY_INCLUDED_DRIVERS_BUS_SPI_H

114
extmod/machine_spi.c
View File

@ -38,61 +38,6 @@
#define MICROPY_PY_MACHINE_SPI_LSB (1)
#endif
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;
uint32_t delay_half = self->delay_half;
// only MSB transfer is implemented
// 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
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;
}
}
}
/******************************************************************************/
// MicroPython bindings for generic machine.SPI
@ -199,9 +144,9 @@ 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;
#ifdef MICROPY_HW_SOFTSPI_MIN_DELAY
if (delay_half == MICROPY_HW_SOFTSPI_MIN_DELAY) {
return MICROPY_HW_SOFTSPI_MAX_BAUDRATE;
} else
#endif
{
@ -210,9 +155,9 @@ STATIC uint32_t baudrate_from_delay_half(uint32_t 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;
#ifdef MICROPY_HW_SOFTSPI_MIN_DELAY
if (baudrate >= MICROPY_HW_SOFTSPI_MAX_BAUDRATE) {
return MICROPY_HW_SOFTSPI_MIN_DELAY;
} else
#endif
{
@ -229,8 +174,8 @@ STATIC void mp_machine_soft_spi_print(const mp_print_t *print, mp_obj_t self_in,
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));
baudrate_from_delay_half(self->spi.delay_half), self->spi.polarity, self->spi.phase,
mp_hal_pin_name(self->spi.sck), mp_hal_pin_name(self->spi.mosi), mp_hal_pin_name(self->spi.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) {
@ -253,9 +198,9 @@ STATIC mp_obj_t mp_machine_soft_spi_make_new(const mp_obj_type_t *type, size_t n
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;
self->spi.delay_half = baudrate_to_delay_half(args[ARG_baudrate].u_int);
self->spi.polarity = args[ARG_polarity].u_int;
self->spi.phase = args[ARG_phase].u_int;
if (args[ARG_bits].u_int != 8) {
mp_raise_ValueError("bits must be 8");
}
@ -267,15 +212,12 @@ STATIC mp_obj_t mp_machine_soft_spi_make_new(const mp_obj_type_t *type, size_t n
|| 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);
self->spi.sck = mp_hal_get_pin_obj(args[ARG_sck].u_obj);
self->spi.mosi = mp_hal_get_pin_obj(args[ARG_mosi].u_obj);
self->spi.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);
// configure bus
mp_soft_spi_ioctl(&self->spi, MP_SPI_IOCTL_INIT);
return MP_OBJ_FROM_PTR(self);
}
@ -296,29 +238,31 @@ STATIC void mp_machine_soft_spi_init(mp_obj_base_t *self_in, size_t n_args, cons
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);
self->spi.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;
self->spi.polarity = args[ARG_polarity].u_int;
}
if (args[ARG_phase].u_int != -1) {
self->phase = args[ARG_phase].u_int;
self->spi.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);
self->spi.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);
self->spi.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);
self->spi.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);
// configure bus
mp_soft_spi_ioctl(&self->spi, MP_SPI_IOCTL_INIT);
}
STATIC 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;
mp_soft_spi_transfer(&self->spi, len, src, dest);
}
const mp_machine_spi_p_t mp_machine_soft_spi_p = {

10
extmod/machine_spi.h
View File

@ -28,6 +28,7 @@
#include "py/obj.h"
#include "py/mphal.h"
#include "drivers/bus/spi.h"
// SPI protocol
typedef struct _mp_machine_spi_p_t {
@ -38,20 +39,13 @@ typedef struct _mp_machine_spi_p_t {
typedef struct _mp_machine_soft_spi_obj_t {
mp_obj_base_t base;
uint32_t delay_half; // microsecond delay for half SCK period
uint8_t polarity;
uint8_t phase;
mp_hal_pin_obj_t sck;
mp_hal_pin_obj_t mosi;
mp_hal_pin_obj_t miso;
mp_soft_spi_obj_t spi;
} mp_machine_soft_spi_obj_t;
extern const mp_machine_spi_p_t mp_machine_soft_spi_p;
extern const mp_obj_type_t mp_machine_soft_spi_type;
extern const mp_obj_dict_t mp_machine_spi_locals_dict;
void mp_machine_soft_spi_transfer(mp_obj_base_t *self, size_t len, const uint8_t *src, uint8_t *dest);
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);
MP_DECLARE_CONST_FUN_OBJ_VAR_BETWEEN(mp_machine_spi_read_obj);

1
ports/esp32/Makefile
View File

@ -195,6 +195,7 @@ LIB_SRC_C += \
endif
DRIVERS_SRC_C = $(addprefix drivers/,\
bus/softspi.c \
dht/dht.c \
)

4
ports/esp32/mpconfigport.h
View File

@ -135,8 +135,8 @@
#define MICROPY_PY_MACHINE_SPI_MSB (0)
#define MICROPY_PY_MACHINE_SPI_LSB (1)
#define MICROPY_PY_MACHINE_SPI_MAKE_NEW machine_hw_spi_make_new
#define MICROPY_PY_MACHINE_SPI_MIN_DELAY (0)
#define MICROPY_PY_MACHINE_SPI_MAX_BAUDRATE (ets_get_cpu_frequency() * 1000000 / 200) // roughly
#define MICROPY_HW_SOFTSPI_MIN_DELAY (0)
#define MICROPY_HW_SOFTSPI_MAX_BAUDRATE (ets_get_cpu_frequency() * 1000000 / 200) // roughly
#define MICROPY_PY_USSL (1)
#define MICROPY_SSL_MBEDTLS (1)
#define MICROPY_PY_USSL_FINALISER (1)

1
ports/esp8266/Makefile
View File

@ -130,6 +130,7 @@ LIB_SRC_C += \
endif
DRIVERS_SRC_C = $(addprefix drivers/,\
bus/softspi.c \
dht/dht.c \
)

1
ports/esp8266/esp8266_common.ld
View File

@ -135,6 +135,7 @@ SECTIONS
*lib/netutils/*.o*(.literal*, .text*)
*lib/timeutils/*.o*(.literal*, .text*)
*lib/utils/*.o*(.literal*, .text*)
*drivers/bus/*.o(.literal* .text*)
build/main.o(.literal* .text*)
*gccollect.o(.literal* .text*)

1
ports/stm32/Makefile
View File

@ -187,6 +187,7 @@ EXTMOD_SRC_C = $(addprefix extmod/,\
)
DRIVERS_SRC_C = $(addprefix drivers/,\
bus/softspi.c \
bus/softqspi.c \
memory/spiflash.c \
dht/dht.c \

4
ports/stm32/mpconfigport.h
View File

@ -140,8 +140,8 @@
#define MICROPY_PY_MACHINE_SPI_MSB (SPI_FIRSTBIT_MSB)
#define MICROPY_PY_MACHINE_SPI_LSB (SPI_FIRSTBIT_LSB)
#define MICROPY_PY_MACHINE_SPI_MAKE_NEW machine_hard_spi_make_new
#define MICROPY_PY_MACHINE_SPI_MIN_DELAY (0)
#define MICROPY_PY_MACHINE_SPI_MAX_BAUDRATE (HAL_RCC_GetSysClockFreq() / 48)
#define MICROPY_HW_SOFTSPI_MIN_DELAY (0)
#define MICROPY_HW_SOFTSPI_MAX_BAUDRATE (HAL_RCC_GetSysClockFreq() / 48)
#define MICROPY_PY_FRAMEBUF (1)
#ifndef MICROPY_PY_USOCKET
#define MICROPY_PY_USOCKET (1)

4
ports/stm32/spibdev.c
View File

@ -42,12 +42,14 @@ static uint32_t flash_tick_counter_last_write;
STATIC const mp_machine_soft_spi_obj_t spiflash_spi_bus = {
.base = {&mp_machine_soft_spi_type},
.delay_half = MICROPY_PY_MACHINE_SPI_MIN_DELAY,
.spi = {
.delay_half = MICROPY_HW_SOFTSPI_MIN_DELAY,
.polarity = 0,
.phase = 0,
.sck = &MICROPY_HW_SPIFLASH_SCK,
.mosi = &MICROPY_HW_SPIFLASH_MOSI,
.miso = &MICROPY_HW_SPIFLASH_MISO,
}
};
STATIC const mp_spiflash_config_t spiflash_config = {