kopia lustrzana https://github.com/pimoroni/pimoroni-pico
86 wiersze
2.6 KiB
C++
86 wiersze
2.6 KiB
C++
#include "common/pimoroni_i2c.hpp"
|
|
#include <cstdio>
|
|
|
|
#define MP_OBJ_TO_PTR2(o, t) ((t *)(uintptr_t)(o))
|
|
|
|
// SDA/SCL on even/odd pins, I2C0/I2C1 on even/odd pairs of pins.
|
|
#define IS_VALID_SCL(i2c, pin) (((pin) & 1) == 1 && (((pin) & 2) >> 1) == (i2c))
|
|
#define IS_VALID_SDA(i2c, pin) (((pin) & 1) == 0 && (((pin) & 2) >> 1) == (i2c))
|
|
|
|
|
|
using namespace pimoroni;
|
|
|
|
extern "C" {
|
|
#include "pimoroni_i2c.h"
|
|
|
|
/***** Variables Struct *****/
|
|
typedef struct _PimoroniI2C_obj_t {
|
|
mp_obj_base_t base;
|
|
I2C *i2c;
|
|
} _PimoroniI2C_obj_t;
|
|
|
|
|
|
/***** Print *****/
|
|
void PimoroniI2C_print(const mp_print_t *print, mp_obj_t self_in, mp_print_kind_t kind) {
|
|
(void)kind; //Unused input parameter
|
|
_PimoroniI2C_obj_t *self = MP_OBJ_TO_PTR2(self_in, _PimoroniI2C_obj_t);
|
|
I2C* i2c = self->i2c;
|
|
mp_print_str(print, "PimoroniI2C(");
|
|
|
|
mp_print_str(print, "i2c = ");
|
|
mp_obj_print_helper(print, mp_obj_new_int((i2c->get_i2c() == i2c0) ? 0 : 1), PRINT_REPR);
|
|
|
|
mp_print_str(print, ", sda = ");
|
|
mp_obj_print_helper(print, mp_obj_new_int(i2c->get_sda()), PRINT_REPR);
|
|
|
|
mp_print_str(print, ", scl = ");
|
|
mp_obj_print_helper(print, mp_obj_new_int(i2c->get_scl()), PRINT_REPR);
|
|
|
|
mp_print_str(print, ")");
|
|
}
|
|
|
|
/***** Destructor ******/
|
|
mp_obj_t PimoroniI2C___del__(mp_obj_t self_in) {
|
|
_PimoroniI2C_obj_t *self = MP_OBJ_TO_PTR2(self_in, _PimoroniI2C_obj_t);
|
|
delete self->i2c;
|
|
return mp_const_none;
|
|
}
|
|
|
|
/***** Constructor *****/
|
|
mp_obj_t PimoroniI2C_make_new(const mp_obj_type_t *type, size_t n_args, size_t n_kw, const mp_obj_t *all_args) {
|
|
_PimoroniI2C_obj_t *self = nullptr;
|
|
|
|
enum { ARG_sda, ARG_scl, ARG_baudrate };
|
|
static const mp_arg_t allowed_args[] = {
|
|
{ MP_QSTR_sda, MP_ARG_INT, {.u_int = I2C_DEFAULT_SDA} },
|
|
{ MP_QSTR_scl, MP_ARG_INT, {.u_int = I2C_DEFAULT_SCL} },
|
|
{ MP_QSTR_baudrate, MP_ARG_INT, {.u_int = I2C_DEFAULT_BAUDRATE} },
|
|
};
|
|
|
|
// 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 I2C bus.
|
|
int sda = args[ARG_sda].u_int;
|
|
int scl = args[ARG_scl].u_int;
|
|
int baud = args[ARG_baudrate].u_int;
|
|
int i2c_id = (sda >> 1) & 0b1; // i2c bus for given SDA pin
|
|
|
|
if(!IS_VALID_SDA(i2c_id, sda)) {
|
|
mp_raise_ValueError(MP_ERROR_TEXT("bad SDA pin"));
|
|
}
|
|
|
|
if(!IS_VALID_SCL(i2c_id, scl)) {
|
|
mp_raise_ValueError(MP_ERROR_TEXT("bad SCL pin"));
|
|
}
|
|
|
|
self = m_new_obj_with_finaliser(_PimoroniI2C_obj_t);
|
|
self->base.type = &PimoroniI2C_type;
|
|
|
|
self->i2c = new I2C(sda, scl, baud);
|
|
|
|
return MP_OBJ_FROM_PTR(self);
|
|
}
|
|
|
|
} |