2021-05-17 17:09:39 +00:00
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#include "common/pimoroni_i2c.hpp"
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#include <cstdio>
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#define MP_OBJ_TO_PTR2(o, t) ((t *)(uintptr_t)(o))
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// SDA/SCL on even/odd pins, I2C0/I2C1 on even/odd pairs of pins.
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#define IS_VALID_SCL(i2c, pin) (((pin) & 1) == 1 && (((pin) & 2) >> 1) == (i2c))
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#define IS_VALID_SDA(i2c, pin) (((pin) & 1) == 0 && (((pin) & 2) >> 1) == (i2c))
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using namespace pimoroni;
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extern "C" {
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#include "pimoroni_i2c.h"
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/***** Variables Struct *****/
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typedef struct _PimoroniI2C_obj_t {
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mp_obj_base_t base;
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I2C *i2c;
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} _PimoroniI2C_obj_t;
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/***** Print *****/
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void PimoroniI2C_print(const mp_print_t *print, mp_obj_t self_in, mp_print_kind_t kind) {
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(void)kind; //Unused input parameter
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_PimoroniI2C_obj_t *self = MP_OBJ_TO_PTR2(self_in, _PimoroniI2C_obj_t);
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I2C* i2c = self->i2c;
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mp_print_str(print, "PimoroniI2C(");
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mp_print_str(print, "i2c = ");
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mp_obj_print_helper(print, mp_obj_new_int((i2c->get_i2c() == i2c0) ? 0 : 1), PRINT_REPR);
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mp_print_str(print, ", sda = ");
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mp_obj_print_helper(print, mp_obj_new_int(i2c->get_sda()), PRINT_REPR);
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mp_print_str(print, ", scl = ");
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mp_obj_print_helper(print, mp_obj_new_int(i2c->get_scl()), PRINT_REPR);
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mp_print_str(print, ")");
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}
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2021-05-18 08:48:41 +00:00
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/***** Destructor ******/
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mp_obj_t PimoroniI2C___del__(mp_obj_t self_in) {
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_PimoroniI2C_obj_t *self = MP_OBJ_TO_PTR2(self_in, _PimoroniI2C_obj_t);
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delete self->i2c;
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return mp_const_none;
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}
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2021-05-17 17:09:39 +00:00
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/***** Constructor *****/
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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) {
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_PimoroniI2C_obj_t *self = nullptr;
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2021-05-18 10:18:41 +00:00
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enum { ARG_sda, ARG_scl, ARG_baudrate };
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2021-05-17 17:09:39 +00:00
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static const mp_arg_t allowed_args[] = {
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{ MP_QSTR_sda, MP_ARG_INT, {.u_int = I2C_DEFAULT_SDA} },
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{ MP_QSTR_scl, MP_ARG_INT, {.u_int = I2C_DEFAULT_SCL} },
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2021-05-18 10:18:41 +00:00
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{ MP_QSTR_baudrate, MP_ARG_INT, {.u_int = I2C_DEFAULT_BAUDRATE} },
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2021-05-17 17:09:39 +00:00
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};
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// Parse args.
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mp_arg_val_t args[MP_ARRAY_SIZE(allowed_args)];
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mp_arg_parse_all_kw_array(n_args, n_kw, all_args, MP_ARRAY_SIZE(allowed_args), allowed_args, args);
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// Get I2C bus.
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int sda = args[ARG_sda].u_int;
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int scl = args[ARG_scl].u_int;
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2021-05-18 10:18:41 +00:00
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int baud = args[ARG_baudrate].u_int;
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2021-05-17 17:09:39 +00:00
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int i2c_id = (sda >> 1) & 0b1; // i2c bus for given SDA pin
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if(!IS_VALID_SDA(i2c_id, sda)) {
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mp_raise_ValueError(MP_ERROR_TEXT("bad SDA pin"));
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}
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if(!IS_VALID_SCL(i2c_id, scl)) {
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mp_raise_ValueError(MP_ERROR_TEXT("bad SCL pin"));
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}
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2021-05-18 08:48:41 +00:00
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self = m_new_obj_with_finaliser(_PimoroniI2C_obj_t);
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2021-05-17 17:09:39 +00:00
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self->base.type = &PimoroniI2C_type;
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2021-05-18 10:18:41 +00:00
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self->i2c = new I2C(sda, scl, baud);
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2021-05-17 17:09:39 +00:00
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return MP_OBJ_FROM_PTR(self);
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}
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}
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