124 lines
3.8 KiB
C
124 lines
3.8 KiB
C
/*
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* This file is part of the MicroPython project, http://micropython.org/
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*
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* The MIT License (MIT)
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*
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* Copyright 2019 Sony Semiconductor Solutions Corporation
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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* THE SOFTWARE.
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*/
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#include <arch/chip/pin.h>
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#include <nuttx/i2c/i2c_master.h>
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#include <cxd56_i2c.h>
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#include "py/runtime.h"
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#include "shared-bindings/busio/I2C.h"
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void common_hal_busio_i2c_construct(busio_i2c_obj_t *self, const mcu_pin_obj_t *scl,
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const mcu_pin_obj_t *sda, uint32_t frequency, uint32_t timeout) {
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if (frequency != I2C_SPEED_STANDARD && frequency != I2C_SPEED_FAST) {
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mp_raise_ValueError(translate("Unsupported baudrate"));
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}
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if (scl->number != PIN_I2C0_BCK || sda->number != PIN_I2C0_BDT) {
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mp_raise_ValueError(translate("Invalid pins"));
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}
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claim_pin(scl);
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claim_pin(sda);
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self->scl_pin = scl;
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self->sda_pin = sda;
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self->frequency = frequency;
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self->i2c_dev = cxd56_i2cbus_initialize(0);
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}
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void common_hal_busio_i2c_deinit(busio_i2c_obj_t *self) {
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if (common_hal_busio_i2c_deinited(self)) {
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return;
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}
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cxd56_i2cbus_uninitialize(self->i2c_dev);
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self->i2c_dev = NULL;
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reset_pin_number(self->scl_pin->number);
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reset_pin_number(self->sda_pin->number);
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}
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bool common_hal_busio_i2c_deinited(busio_i2c_obj_t *self) {
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return self->i2c_dev == NULL;
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}
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bool common_hal_busio_i2c_try_lock(busio_i2c_obj_t *self) {
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bool grabbed_lock = false;
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if (!self->has_lock) {
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grabbed_lock = true;
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self->has_lock = true;
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}
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return grabbed_lock;
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}
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bool common_hal_busio_i2c_has_lock(busio_i2c_obj_t *self) {
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return self->has_lock;
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}
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void common_hal_busio_i2c_unlock(busio_i2c_obj_t *self) {
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self->has_lock = false;
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}
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bool common_hal_busio_i2c_probe(busio_i2c_obj_t *self, uint8_t addr) {
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struct i2c_msg_s msg;
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msg.frequency = self->frequency;
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msg.addr = addr;
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msg.flags = 0;
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msg.buffer = NULL;
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msg.length = 0;
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return I2C_TRANSFER(self->i2c_dev, &msg, 1) < 0 ? false : true;
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}
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uint8_t common_hal_busio_i2c_write(busio_i2c_obj_t *self, uint16_t address, const uint8_t *data, size_t len, bool stop) {
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struct i2c_msg_s msg;
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msg.frequency = self->frequency;
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msg.addr = address;
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msg.flags = (stop ? 0 : I2C_M_NOSTOP);
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msg.buffer = (uint8_t *) data;
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msg.length = len;
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return I2C_TRANSFER(self->i2c_dev, &msg, 1);
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}
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uint8_t common_hal_busio_i2c_read(busio_i2c_obj_t *self, uint16_t address, uint8_t *data, size_t len) {
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struct i2c_msg_s msg;
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msg.frequency = self->frequency;
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msg.addr = address;
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msg.flags = I2C_M_READ;
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msg.buffer = data;
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msg.length = len;
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return I2C_TRANSFER(self->i2c_dev, &msg, 1);
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}
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void common_hal_busio_i2c_never_reset(busio_i2c_obj_t *self) {
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never_reset_pin_number(self->scl_pin->number);
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never_reset_pin_number(self->sda_pin->number);
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}
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