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stmhal: Refactor to use extmod implementation of software SPI class. 

This is a pure refactoring (and simplification) of code so that stmhal
uses the software SPI class provided in extmod, for the machine.SPI
implementation.
This commit is contained in:
Damien George 2016-12-08 13:58:10 +11:00
parent 1eb3c66e91
commit 1b6d94bccd
2 changed files with 50 additions and 228 deletions
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3
stmhal/mpconfigport.h
View File

@ -105,6 +105,9 @@
#define MICROPY_PY_MACHINE_I2C (1) #define MICROPY_PY_MACHINE_I2C (1)
#define MICROPY_PY_MACHINE_I2C_MAKE_NEW machine_hard_i2c_make_new #define MICROPY_PY_MACHINE_I2C_MAKE_NEW machine_hard_i2c_make_new
#define MICROPY_PY_MACHINE_SPI (1) #define MICROPY_PY_MACHINE_SPI (1)
#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_MIN_DELAY (0)
#define MICROPY_PY_MACHINE_SPI_MAX_BAUDRATE (HAL_RCC_GetSysClockFreq() / 48) #define MICROPY_PY_MACHINE_SPI_MAX_BAUDRATE (HAL_RCC_GetSysClockFreq() / 48)
#define MICROPY_PY_FRAMEBUF (1) #define MICROPY_PY_FRAMEBUF (1)

275
stmhal/spi.c
View File

@ -829,216 +829,7 @@ const mp_obj_type_t pyb_spi_type = {
}; };
/******************************************************************************/ /******************************************************************************/
/* MicroPython bindings for machine API */ // Implementation of hard SPI for machine module
// 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 mp_obj_t machine_soft_spi_make_new(mp_arg_val_t *args);
STATIC void machine_soft_spi_init(mp_obj_t self, mp_arg_val_t *args);
STATIC void machine_soft_spi_deinit(mp_obj_t self);
STATIC mp_obj_t machine_hard_spi_make_new(mp_arg_val_t *args);
STATIC void machine_hard_spi_init(mp_obj_t self, mp_arg_val_t *args);
STATIC void machine_hard_spi_deinit(mp_obj_t self);
/* common code for both soft and hard implementations *************************/
STATIC mp_obj_t machine_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 = 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 = SPI_FIRSTBIT_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} },
};
// 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);
if (args[ARG_NEW_id].u_obj == MP_OBJ_NEW_SMALL_INT(-1)) {
// software SPI
return machine_soft_spi_make_new(args);
} else {
// hardware peripheral id given
return machine_hard_spi_make_new(args);
}
}
STATIC mp_obj_t machine_spi_init(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 = -1} },
{ MP_QSTR_polarity, MP_ARG_KW_ONLY | MP_ARG_INT, {.u_int = -1} },
{ MP_QSTR_phase, MP_ARG_KW_ONLY | MP_ARG_INT, {.u_int = -1} },
{ MP_QSTR_bits, MP_ARG_KW_ONLY | MP_ARG_INT, {.u_int = -1} },
{ MP_QSTR_firstbit, MP_ARG_KW_ONLY | MP_ARG_INT, {.u_int = -1} },
};
// parse args
mp_obj_t self = pos_args[0];
mp_arg_val_t args[MP_ARRAY_SIZE(allowed_args)];
mp_arg_parse_all(n_args - 1, pos_args + 1, kw_args, MP_ARRAY_SIZE(allowed_args), allowed_args, args);
// dispatch to specific implementation
if (mp_obj_get_type(self) == &machine_soft_spi_type) {
machine_soft_spi_init(self, args);
} else {
machine_hard_spi_init(self, 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) {
// dispatch to specific implementation
if (mp_obj_get_type(self) == &machine_soft_spi_type) {
machine_soft_spi_deinit(self);
} else {
machine_hard_spi_deinit(self);
}
return mp_const_none;
}
STATIC MP_DEFINE_CONST_FUN_OBJ_1(machine_spi_deinit_obj, machine_spi_deinit);
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(SPI_FIRSTBIT_MSB) },
{ MP_ROM_QSTR(MP_QSTR_LSB), MP_ROM_INT(SPI_FIRSTBIT_LSB) },
};
STATIC MP_DEFINE_CONST_DICT(machine_spi_locals_dict, machine_spi_locals_dict_table);
/* code for soft implementation ***********************************************/
// for the software SPI implementation, this is roughly the max baudrate
#define MAX_BAUDRATE (HAL_RCC_GetSysClockFreq() / 48)
STATIC uint32_t baudrate_from_delay_half(uint32_t delay_half) {
if (delay_half == MICROPY_PY_MACHINE_SPI_MIN_DELAY) {
return MAX_BAUDRATE;
} else {
return 500000 / delay_half;
}
}
STATIC uint32_t baudrate_to_delay_half(uint32_t baudrate) {
if (baudrate >= MAX_BAUDRATE) {
return MICROPY_PY_MACHINE_SPI_MIN_DELAY;
} else {
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 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, "SPI(-1, baudrate=%u, polarity=%u, phase=%u, sck=%q, mosi=%q, miso=%q)",
baudrate_from_delay_half(self->delay_half), self->polarity, self->phase,
self->sck->name, self->mosi->name, self->miso->name);
}
STATIC mp_obj_t machine_soft_spi_make_new(mp_arg_val_t *args) {
// create new object
mp_machine_soft_spi_obj_t *self = m_new_obj(mp_machine_soft_spi_obj_t);
self->base.type = &machine_soft_spi_type;
// set parameters
self->delay_half = baudrate_to_delay_half(args[ARG_NEW_baudrate].u_int);
self->polarity = args[ARG_NEW_polarity].u_int;
self->phase = args[ARG_NEW_phase].u_int;
if (args[ARG_NEW_bits].u_int != 8) {
mp_raise_ValueError("bits must be 8");
}
if (args[ARG_NEW_firstbit].u_int != SPI_FIRSTBIT_MSB) {
mp_raise_ValueError("firstbit must be MSB");
}
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) {
mp_raise_ValueError("must specify all of sck/mosi/miso");
}
self->sck = mp_hal_get_pin_obj(args[ARG_NEW_sck].u_obj);
self->mosi = mp_hal_get_pin_obj(args[ARG_NEW_mosi].u_obj);
self->miso = mp_hal_get_pin_obj(args[ARG_NEW_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 machine_soft_spi_init(mp_obj_t self_in, mp_arg_val_t *args) {
mp_machine_soft_spi_obj_t *self = MP_OBJ_TO_PTR(self_in);
// update parameters
if (args[ARG_INIT_baudrate].u_int != -1) {
self->delay_half = baudrate_to_delay_half(args[ARG_INIT_baudrate].u_int);
}
if (args[ARG_INIT_polarity].u_int != -1) {
self->polarity = args[ARG_INIT_polarity].u_int;
}
if (args[ARG_INIT_phase].u_int != -1) {
self->phase = args[ARG_INIT_phase].u_int;
}
}
STATIC void machine_soft_spi_deinit(mp_obj_t self) {
// nothing to do
(void)self;
}
STATIC const mp_machine_spi_p_t machine_soft_spi_p = {
.transfer = mp_machine_soft_spi_transfer,
};
const mp_obj_type_t machine_soft_spi_type = {
{ &mp_type_type },
.name = MP_QSTR_SoftSPI,
.print = machine_soft_spi_print,
.make_new = machine_spi_make_new,
.protocol = &machine_soft_spi_p,
.locals_dict = (mp_obj_t)&machine_spi_locals_dict,
};
/* code for hard implementation ***********************************************/
typedef struct _machine_hard_spi_obj_t { typedef struct _machine_hard_spi_obj_t {
mp_obj_base_t base; mp_obj_base_t base;
@ -1055,19 +846,34 @@ STATIC const machine_hard_spi_obj_t machine_hard_spi_obj[] = {
}; };
STATIC void machine_hard_spi_print(const mp_print_t *print, mp_obj_t self_in, mp_print_kind_t kind) { 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; machine_hard_spi_obj_t *self = (machine_hard_spi_obj_t*)self_in;
spi_print(print, self->pyb->spi, false); spi_print(print, self->pyb->spi, false);
} }
STATIC mp_obj_t machine_hard_spi_make_new(mp_arg_val_t *args) { 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) {
enum { ARG_id, 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_id, MP_ARG_OBJ, {.u_obj = MP_OBJ_NEW_SMALL_INT(-1)} },
{ 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 = SPI_FIRSTBIT_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);
// get static peripheral object // get static peripheral object
int spi_id = spi_find(args[ARG_NEW_id].u_obj); int spi_id = spi_find(args[ARG_id].u_obj);
const machine_hard_spi_obj_t *self = &machine_hard_spi_obj[spi_id - 1]; const machine_hard_spi_obj_t *self = &machine_hard_spi_obj[spi_id - 1];
// here we would check the sck/mosi/miso pins and configure them, but it's not implemented // here we would check the sck/mosi/miso pins and configure them, but it's not implemented
if (args[ARG_NEW_sck].u_obj != MP_OBJ_NULL if (args[ARG_sck].u_obj != MP_OBJ_NULL
|| args[ARG_NEW_mosi].u_obj != MP_OBJ_NULL || args[ARG_mosi].u_obj != MP_OBJ_NULL
|| args[ARG_NEW_miso].u_obj != MP_OBJ_NULL) { || args[ARG_miso].u_obj != MP_OBJ_NULL) {
mp_raise_ValueError("explicit choice of sck/mosi/miso is not implemented"); mp_raise_ValueError("explicit choice of sck/mosi/miso is not implemented");
} }
@ -1083,9 +889,9 @@ STATIC mp_obj_t machine_hard_spi_make_new(mp_arg_val_t *args) {
init->CRCPolynomial = 0; init->CRCPolynomial = 0;
// set configurable paramaters // set configurable paramaters
spi_set_params(self->pyb->spi, 0xffffffff, args[ARG_NEW_baudrate].u_int, spi_set_params(self->pyb->spi, 0xffffffff, args[ARG_baudrate].u_int,
args[ARG_NEW_polarity].u_int, args[ARG_NEW_phase].u_int, args[ARG_NEW_bits].u_int, args[ARG_polarity].u_int, args[ARG_phase].u_int, args[ARG_bits].u_int,
args[ARG_NEW_firstbit].u_int); args[ARG_firstbit].u_int);
// init the SPI bus // init the SPI bus
spi_init(self->pyb->spi, false); spi_init(self->pyb->spi, false);
@ -1093,20 +899,31 @@ STATIC mp_obj_t machine_hard_spi_make_new(mp_arg_val_t *args) {
return MP_OBJ_FROM_PTR(self); return MP_OBJ_FROM_PTR(self);
} }
STATIC void machine_hard_spi_init(mp_obj_t self_in, mp_arg_val_t *args) { 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) {
machine_hard_spi_obj_t *self = self_in; machine_hard_spi_obj_t *self = (machine_hard_spi_obj_t*)self_in;
enum { ARG_baudrate, ARG_polarity, ARG_phase, ARG_bits, ARG_firstbit };
static const mp_arg_t allowed_args[] = {
{ MP_QSTR_baudrate, MP_ARG_KW_ONLY | MP_ARG_INT, {.u_int = -1} },
{ MP_QSTR_polarity, MP_ARG_KW_ONLY | MP_ARG_INT, {.u_int = -1} },
{ MP_QSTR_phase, MP_ARG_KW_ONLY | MP_ARG_INT, {.u_int = -1} },
{ MP_QSTR_bits, MP_ARG_KW_ONLY | MP_ARG_INT, {.u_int = -1} },
{ MP_QSTR_firstbit, MP_ARG_KW_ONLY | MP_ARG_INT, {.u_int = -1} },
};
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);
// set the SPI configuration values // set the SPI configuration values
spi_set_params(self->pyb->spi, 0xffffffff, args[ARG_INIT_baudrate].u_int, spi_set_params(self->pyb->spi, 0xffffffff, args[ARG_baudrate].u_int,
args[ARG_INIT_polarity].u_int, args[ARG_INIT_phase].u_int, args[ARG_INIT_bits].u_int, args[ARG_polarity].u_int, args[ARG_phase].u_int, args[ARG_bits].u_int,
args[ARG_INIT_firstbit].u_int); args[ARG_firstbit].u_int);
// re-init the SPI bus // re-init the SPI bus
spi_init(self->pyb->spi, false); spi_init(self->pyb->spi, false);
} }
STATIC void machine_hard_spi_deinit(mp_obj_t self_in) { STATIC void machine_hard_spi_deinit(mp_obj_base_t *self_in) {
machine_hard_spi_obj_t *self = self_in; machine_hard_spi_obj_t *self = (machine_hard_spi_obj_t*)self_in;
spi_deinit(self->pyb->spi); spi_deinit(self->pyb->spi);
} }
@ -1116,6 +933,8 @@ STATIC void machine_hard_spi_transfer(mp_obj_base_t *self_in, size_t len, const
} }
STATIC const mp_machine_spi_p_t machine_hard_spi_p = { 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, .transfer = machine_hard_spi_transfer,
}; };
@ -1123,7 +942,7 @@ const mp_obj_type_t machine_hard_spi_type = {
{ &mp_type_type }, { &mp_type_type },
.name = MP_QSTR_SPI, .name = MP_QSTR_SPI,
.print = machine_hard_spi_print, .print = machine_hard_spi_print,
.make_new = machine_spi_make_new, .make_new = mp_machine_spi_make_new, // delegate to master constructor
.protocol = &machine_hard_spi_p, .protocol = &machine_hard_spi_p,
.locals_dict = (mp_obj_t)&machine_spi_locals_dict, .locals_dict = (mp_obj_t)&mp_machine_spi_locals_dict,
}; };