127 lines
4.2 KiB
C
127 lines
4.2 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 (c) 2020 microDev
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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 "shared-bindings/i2ctarget/I2CTarget.h"
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#include "py/mperrno.h"
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#include "py/runtime.h"
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#include "common-hal/i2ctarget/I2CTarget.h"
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#include "shared-bindings/microcontroller/Pin.h"
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void common_hal_i2ctarget_i2c_target_construct(i2ctarget_i2c_target_obj_t *self,
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const mcu_pin_obj_t *scl, const mcu_pin_obj_t *sda,
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uint8_t *addresses, unsigned int num_addresses, bool smbus) {
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// Pins 45 and 46 are "strapping" pins that impact start up behavior. They usually need to
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// be pulled-down so pulling them up for I2C is a bad idea. To make this hard, we don't
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// support I2C on these pins.
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// Also 46 is input-only so it'll never work.
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if (scl->number == 45 || scl->number == 46 || sda->number == 45 || sda->number == 46) {
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raise_ValueError_invalid_pins();
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}
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if (num_addresses > 1) {
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mp_raise_ValueError(MP_ERROR_TEXT("Only one address is allowed"));
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}
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self->addresses = addresses;
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self->num_addresses = num_addresses;
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self->sda_pin = sda;
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self->scl_pin = scl;
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self->i2c_num = peripherals_i2c_get_free_num();
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if (self->i2c_num == I2C_NUM_MAX) {
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mp_raise_ValueError(MP_ERROR_TEXT("All I2C peripherals are in use"));
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}
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const i2c_config_t i2c_conf = {
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.mode = I2C_MODE_SLAVE,
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.sda_io_num = self->sda_pin->number,
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.scl_io_num = self->scl_pin->number,
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.sda_pullup_en = GPIO_PULLUP_ENABLE,
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.scl_pullup_en = GPIO_PULLUP_ENABLE,
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.slave.addr_10bit_en = 0,
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.slave.slave_addr = self->addresses[0],
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};
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// Initialize I2C.
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esp_err_t err = peripherals_i2c_init(self->i2c_num, &i2c_conf);
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if (err != ESP_OK) {
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if (err == ESP_FAIL) {
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mp_raise_OSError(MP_EIO);
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} else {
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mp_arg_error_invalid(MP_QSTR_I2CTarget);
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}
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}
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claim_pin(sda);
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claim_pin(scl);
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}
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bool common_hal_i2ctarget_i2c_target_deinited(i2ctarget_i2c_target_obj_t *self) {
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return self->sda_pin == NULL;
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}
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void common_hal_i2ctarget_i2c_target_deinit(i2ctarget_i2c_target_obj_t *self) {
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if (common_hal_i2ctarget_i2c_target_deinited(self)) {
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return;
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}
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peripherals_i2c_deinit(self->i2c_num);
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common_hal_reset_pin(self->sda_pin);
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common_hal_reset_pin(self->scl_pin);
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self->sda_pin = NULL;
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self->scl_pin = NULL;
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}
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int common_hal_i2ctarget_i2c_target_is_addressed(i2ctarget_i2c_target_obj_t *self,
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uint8_t *address, bool *is_read, bool *is_restart) {
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*address = self->addresses[0];
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*is_read = true;
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*is_restart = false;
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return 1;
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}
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int common_hal_i2ctarget_i2c_target_read_byte(i2ctarget_i2c_target_obj_t *self, uint8_t *data) {
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i2c_slave_read_buffer(self->i2c_num, data, 128, 0);
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return 1;
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}
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int common_hal_i2ctarget_i2c_target_write_byte(i2ctarget_i2c_target_obj_t *self, uint8_t data) {
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i2c_reset_tx_fifo(self->i2c_num);
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i2c_slave_write_buffer(self->i2c_num, &data, 128, 0);
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return 1;
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}
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void common_hal_i2ctarget_i2c_target_ack(i2ctarget_i2c_target_obj_t *self, bool ack) {
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}
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void common_hal_i2ctarget_i2c_target_close(i2ctarget_i2c_target_obj_t *self) {
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}
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