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extmod/machine_i2c: Add a C-level I2C-protocol, refactoring soft I2C.

This commit is contained in:
Damien George 2016-11-22 22:49:54 +11:00
parent 63a5df3cb4
commit b983cfaf41
2 changed files with 111 additions and 24 deletions
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124
extmod/machine_i2c.c
View File

@ -28,6 +28,7 @@
#include <stdint.h>
#include <string.h>
#include "py/mperrno.h"
#include "py/mphal.h"
#include "py/runtime.h"
#include "extmod/machine_i2c.h"
@ -309,36 +310,48 @@ STATIC mp_obj_t machine_i2c_scan(mp_obj_t self_in) {
MP_DEFINE_CONST_FUN_OBJ_1(machine_i2c_scan_obj, machine_i2c_scan);
STATIC mp_obj_t machine_i2c_start(mp_obj_t self_in) {
machine_i2c_obj_t *self = MP_OBJ_TO_PTR(self_in);
if (!mp_hal_i2c_start(self)) {
nlr_raise(mp_obj_new_exception_msg(&mp_type_OSError, "I2C bus error"));
mp_obj_base_t *self = (mp_obj_base_t*)MP_OBJ_TO_PTR(self_in);
mp_machine_i2c_p_t *i2c_p = (mp_machine_i2c_p_t*)self->type->protocol;
if (i2c_p->start == NULL) {
mp_raise_msg(&mp_type_OSError, "I2C operation not supported");
}
int ret = i2c_p->start(self);
if (ret != 0) {
mp_raise_OSError(ret);
}
return mp_const_none;
}
MP_DEFINE_CONST_FUN_OBJ_1(machine_i2c_start_obj, machine_i2c_start);
STATIC mp_obj_t machine_i2c_stop(mp_obj_t self_in) {
machine_i2c_obj_t *self = MP_OBJ_TO_PTR(self_in);
if (!mp_hal_i2c_stop(self)) {
nlr_raise(mp_obj_new_exception_msg(&mp_type_OSError, "I2C bus error"));
mp_obj_base_t *self = (mp_obj_base_t*)MP_OBJ_TO_PTR(self_in);
mp_machine_i2c_p_t *i2c_p = (mp_machine_i2c_p_t*)self->type->protocol;
if (i2c_p->stop == NULL) {
mp_raise_msg(&mp_type_OSError, "I2C operation not supported");
}
int ret = i2c_p->stop(self);
if (ret != 0) {
mp_raise_OSError(ret);
}
return mp_const_none;
}
MP_DEFINE_CONST_FUN_OBJ_1(machine_i2c_stop_obj, machine_i2c_stop);
STATIC mp_obj_t machine_i2c_readinto(mp_obj_t self_in, mp_obj_t buf_in) {
machine_i2c_obj_t *self = MP_OBJ_TO_PTR(self_in);
mp_obj_base_t *self = (mp_obj_base_t*)MP_OBJ_TO_PTR(self_in);
mp_machine_i2c_p_t *i2c_p = (mp_machine_i2c_p_t*)self->type->protocol;
if (i2c_p->read == NULL) {
mp_raise_msg(&mp_type_OSError, "I2C operation not supported");
}
// get the buffer to read into
mp_buffer_info_t bufinfo;
mp_get_buffer_raise(buf_in, &bufinfo, MP_BUFFER_WRITE);
// do the read
uint8_t *dest = bufinfo.buf;
while (bufinfo.len--) {
if (!mp_hal_i2c_read_byte(self, dest++, bufinfo.len == 0)) {
nlr_raise(mp_obj_new_exception_msg(&mp_type_OSError, "I2C bus error"));
}
int ret = i2c_p->read(self, bufinfo.buf, bufinfo.len);
if (ret != 0) {
mp_raise_OSError(ret);
}
return mp_const_none;
@ -346,18 +359,20 @@ STATIC mp_obj_t machine_i2c_readinto(mp_obj_t self_in, mp_obj_t buf_in) {
MP_DEFINE_CONST_FUN_OBJ_2(machine_i2c_readinto_obj, machine_i2c_readinto);
STATIC mp_obj_t machine_i2c_write(mp_obj_t self_in, mp_obj_t buf_in) {
machine_i2c_obj_t *self = MP_OBJ_TO_PTR(self_in);
mp_obj_base_t *self = (mp_obj_base_t*)MP_OBJ_TO_PTR(self_in);
mp_machine_i2c_p_t *i2c_p = (mp_machine_i2c_p_t*)self->type->protocol;
if (i2c_p->write == NULL) {
mp_raise_msg(&mp_type_OSError, "I2C operation not supported");
}
// get the buffer to write from
mp_buffer_info_t bufinfo;
mp_get_buffer_raise(buf_in, &bufinfo, MP_BUFFER_READ);
// do the write
uint8_t *src = bufinfo.buf;
while (bufinfo.len--) {
if (!mp_hal_i2c_write_byte(self, *src++)) {
nlr_raise(mp_obj_new_exception_msg(&mp_type_OSError, "I2C bus error"));
}
int ret = i2c_p->write(self, bufinfo.buf, bufinfo.len);
if (ret != 0) {
mp_raise_OSError(ret);
}
return mp_const_none;
@ -365,28 +380,31 @@ STATIC mp_obj_t machine_i2c_write(mp_obj_t self_in, mp_obj_t buf_in) {
MP_DEFINE_CONST_FUN_OBJ_2(machine_i2c_write_obj, machine_i2c_write);
STATIC mp_obj_t machine_i2c_readfrom(mp_obj_t self_in, mp_obj_t addr_in, mp_obj_t nbytes_in) {
machine_i2c_obj_t *self = MP_OBJ_TO_PTR(self_in);
mp_obj_base_t *self = (mp_obj_base_t*)MP_OBJ_TO_PTR(self_in);
mp_machine_i2c_p_t *i2c_p = (mp_machine_i2c_p_t*)self->type->protocol;
vstr_t vstr;
vstr_init_len(&vstr, mp_obj_get_int(nbytes_in));
mp_hal_i2c_read(self, mp_obj_get_int(addr_in), (uint8_t*)vstr.buf, vstr.len);
i2c_p->readfrom(self, mp_obj_get_int(addr_in), (uint8_t*)vstr.buf, vstr.len, true);
return mp_obj_new_str_from_vstr(&mp_type_bytes, &vstr);
}
MP_DEFINE_CONST_FUN_OBJ_3(machine_i2c_readfrom_obj, machine_i2c_readfrom);
STATIC mp_obj_t machine_i2c_readfrom_into(mp_obj_t self_in, mp_obj_t addr_in, mp_obj_t buf_in) {
machine_i2c_obj_t *self = MP_OBJ_TO_PTR(self_in);
mp_obj_base_t *self = (mp_obj_base_t*)MP_OBJ_TO_PTR(self_in);
mp_machine_i2c_p_t *i2c_p = (mp_machine_i2c_p_t*)self->type->protocol;
mp_buffer_info_t bufinfo;
mp_get_buffer_raise(buf_in, &bufinfo, MP_BUFFER_WRITE);
mp_hal_i2c_read(self, mp_obj_get_int(addr_in), (uint8_t*)bufinfo.buf, bufinfo.len);
i2c_p->readfrom(self, mp_obj_get_int(addr_in), bufinfo.buf, bufinfo.len, true);
return mp_const_none;
}
MP_DEFINE_CONST_FUN_OBJ_3(machine_i2c_readfrom_into_obj, machine_i2c_readfrom_into);
STATIC mp_obj_t machine_i2c_writeto(mp_obj_t self_in, mp_obj_t addr_in, mp_obj_t buf_in) {
machine_i2c_obj_t *self = MP_OBJ_TO_PTR(self_in);
mp_obj_base_t *self = (mp_obj_base_t*)MP_OBJ_TO_PTR(self_in);
mp_machine_i2c_p_t *i2c_p = (mp_machine_i2c_p_t*)self->type->protocol;
mp_buffer_info_t bufinfo;
mp_get_buffer_raise(buf_in, &bufinfo, MP_BUFFER_READ);
mp_hal_i2c_write(self, mp_obj_get_int(addr_in), bufinfo.buf, bufinfo.len);
i2c_p->writeto(self, mp_obj_get_int(addr_in), bufinfo.buf, bufinfo.len, true);
return mp_const_none;
}
STATIC MP_DEFINE_CONST_FUN_OBJ_3(machine_i2c_writeto_obj, machine_i2c_writeto);
@ -476,10 +494,68 @@ STATIC const mp_rom_map_elem_t machine_i2c_locals_dict_table[] = {
STATIC MP_DEFINE_CONST_DICT(machine_i2c_locals_dict, machine_i2c_locals_dict_table);
int mp_machine_soft_i2c_start(mp_obj_base_t *self_in) {
machine_i2c_obj_t *self = (machine_i2c_obj_t*)self_in;
if (!mp_hal_i2c_start(self)) {
return MP_ETIMEDOUT;
}
return 0; // success
}
int mp_machine_soft_i2c_stop(mp_obj_base_t *self_in) {
machine_i2c_obj_t *self = (machine_i2c_obj_t*)self_in;
if (!mp_hal_i2c_stop(self)) {
return MP_ETIMEDOUT;
}
return 0; // success
}
int mp_machine_soft_i2c_read(mp_obj_base_t *self_in, uint8_t *dest, size_t len) {
machine_i2c_obj_t *self = (machine_i2c_obj_t*)self_in;
while (len--) {
if (!mp_hal_i2c_read_byte(self, dest++, len == 0)) {
return MP_ETIMEDOUT;
}
}
return 0; // success
}
int mp_machine_soft_i2c_write(mp_obj_base_t *self_in, const uint8_t *src, size_t len) {
machine_i2c_obj_t *self = (machine_i2c_obj_t*)self_in;
while (len--) {
if (!mp_hal_i2c_write_byte(self, *src++)) {
return MP_ETIMEDOUT;
}
}
return 0; // success
}
int mp_machine_soft_i2c_readfrom(mp_obj_base_t *self_in, uint16_t addr, uint8_t *dest, size_t len, bool stop) {
machine_i2c_obj_t *self = (machine_i2c_obj_t*)self_in;
mp_hal_i2c_read(self, addr, dest, len);
return 0; // success
}
int mp_machine_soft_i2c_writeto(mp_obj_base_t *self_in, uint16_t addr, const uint8_t *src, size_t len, bool stop) {
machine_i2c_obj_t *self = (machine_i2c_obj_t*)self_in;
mp_hal_i2c_write(self, addr, src, len);
return 0; // success
}
STATIC const mp_machine_i2c_p_t mp_machine_soft_i2c_p = {
.start = mp_machine_soft_i2c_start,
.stop = mp_machine_soft_i2c_stop,
.read = mp_machine_soft_i2c_read,
.write = mp_machine_soft_i2c_write,
.readfrom = mp_machine_soft_i2c_readfrom,
.writeto = mp_machine_soft_i2c_writeto,
};
const mp_obj_type_t machine_i2c_type = {
{ &mp_type_type },
.name = MP_QSTR_I2C,
.make_new = machine_i2c_make_new,
.protocol = &mp_machine_soft_i2c_p,
.locals_dict = (mp_obj_dict_t*)&machine_i2c_locals_dict,
};

11
extmod/machine_i2c.h
View File

@ -29,6 +29,17 @@
#include "py/obj.h"
// I2C protocol
// the first 4 methods can be NULL, meaning operation is not supported
typedef struct _mp_machine_i2c_p_t {
int (*start)(mp_obj_base_t *obj);
int (*stop)(mp_obj_base_t *obj);
int (*read)(mp_obj_base_t *obj, uint8_t *dest, size_t len);
int (*write)(mp_obj_base_t *obj, const uint8_t *src, size_t len);
int (*readfrom)(mp_obj_base_t *obj, uint16_t addr, uint8_t *dest, size_t len, bool stop);
int (*writeto)(mp_obj_base_t *obj, uint16_t addr, const uint8_t *src, size_t len, bool stop);
} mp_machine_i2c_p_t;
extern const mp_obj_type_t machine_i2c_type;
#endif // __MICROPY_INCLUDED_EXTMOD_MACHINE_I2C_H__