73c15dcf8b
This is prep for merging in the NRF5 pull request.
210 lines
6.7 KiB
C
210 lines
6.7 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) 2016 Scott Shawcroft
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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/busio/I2C.h"
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#include "py/mperrno.h"
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#include "py/nlr.h"
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#include "py/runtime.h"
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#include "asf/sam0/drivers/sercom/i2c/i2c_master.h"
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#include "samd21_pins.h"
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// We use ENABLE registers below we don't want to treat as a macro.
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#undef ENABLE
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// Number of times to try to send packet if failed.
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#define TIMEOUT 1
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void common_hal_busio_i2c_construct(busio_i2c_obj_t *self,
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const mcu_pin_obj_t* scl, const mcu_pin_obj_t* sda, uint32_t frequency) {
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struct i2c_master_config config_i2c_master;
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i2c_master_get_config_defaults(&config_i2c_master);
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// Struct takes the argument in Khz not Hz.
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config_i2c_master.baud_rate = frequency / 1000;
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Sercom* sercom = NULL;
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uint32_t sda_pinmux = 0;
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uint32_t scl_pinmux = 0;
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for (int i = 0; i < NUM_SERCOMS_PER_PIN; i++) {
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Sercom* potential_sercom = sda->sercom[i].sercom;
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if (potential_sercom == NULL ||
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potential_sercom->I2CM.CTRLA.bit.ENABLE != 0 ||
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sda->sercom[i].pad != 0) {
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continue;
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}
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sda_pinmux = PINMUX(sda->pin, (i == 0) ? MUX_C : MUX_D);
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for (int j = 0; j < NUM_SERCOMS_PER_PIN; j++) {
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if (potential_sercom == scl->sercom[j].sercom &&
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scl->sercom[j].pad == 1) {
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scl_pinmux = PINMUX(scl->pin, (j == 0) ? MUX_C : MUX_D);
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sercom = potential_sercom;
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break;
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}
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}
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if (sercom != NULL) {
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break;
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}
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}
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if (sercom == NULL) {
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mp_raise_ValueError("Invalid pins");
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}
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config_i2c_master.pinmux_pad0 = sda_pinmux; // SDA
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config_i2c_master.pinmux_pad1 = scl_pinmux; // SCL
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config_i2c_master.buffer_timeout = 10000;
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self->sda_pin = sda->pin;
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self->scl_pin = scl->pin;
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claim_pin(sda);
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claim_pin(scl);
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enum status_code status = i2c_master_init(&self->i2c_master_instance,
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sercom, &config_i2c_master);
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if (status != STATUS_OK) {
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common_hal_busio_i2c_deinit(self);
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if (status == STATUS_ERR_BAUDRATE_UNAVAILABLE) {
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mp_raise_ValueError("Unsupported baudrate");
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} else {
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mp_raise_OSError(MP_EIO);
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}
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}
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i2c_master_enable(&self->i2c_master_instance);
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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->sda_pin == NO_PIN;
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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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i2c_master_reset(&self->i2c_master_instance);
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reset_pin(self->sda_pin);
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reset_pin(self->scl_pin);
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self->sda_pin = NO_PIN;
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self->scl_pin = NO_PIN;
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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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uint8_t buf;
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struct i2c_master_packet packet = {
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.address = addr,
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.data_length = 0,
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.data = &buf,
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.ten_bit_address = false,
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.high_speed = false,
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.hs_master_code = 0x0,
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};
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enum status_code status = i2c_master_write_packet_wait(
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&self->i2c_master_instance, &packet);
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return status == STATUS_OK;
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}
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void common_hal_busio_i2c_configure(busio_i2c_obj_t *self,
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uint32_t baudrate, uint8_t polarity, uint8_t phase, uint8_t bits) {
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return;
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}
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bool common_hal_busio_i2c_try_lock(busio_i2c_obj_t *self) {
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self->has_lock = i2c_master_lock(&self->i2c_master_instance) == STATUS_OK;
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return self->has_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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i2c_master_unlock(&self->i2c_master_instance);
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}
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uint8_t common_hal_busio_i2c_write(busio_i2c_obj_t *self, uint16_t addr,
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const uint8_t *data, size_t len, bool transmit_stop_bit) {
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struct i2c_master_packet packet = {
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.address = addr,
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.data_length = len,
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.data = (uint8_t *) data,
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.ten_bit_address = false,
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.high_speed = false,
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.hs_master_code = 0x0,
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};
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uint16_t timeout = 0;
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enum status_code status = STATUS_BUSY;
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while (status != STATUS_OK) {
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if (transmit_stop_bit) {
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status = i2c_master_write_packet_wait(&self->i2c_master_instance,
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&packet);
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} else {
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status = i2c_master_write_packet_wait_no_stop(
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&self->i2c_master_instance, &packet);
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}
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/* Increment timeout counter and check if timed out. */
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if (timeout++ == TIMEOUT) {
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break;
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}
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}
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if (status == STATUS_OK) {
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return 0;
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} else if (status == STATUS_ERR_BAD_ADDRESS) {
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return MP_ENODEV;
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}
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return MP_EIO;
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}
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uint8_t common_hal_busio_i2c_read(busio_i2c_obj_t *self, uint16_t addr,
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uint8_t *data, size_t len) {
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struct i2c_master_packet packet = {
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.address = addr,
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.data_length = len,
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.data = data,
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.ten_bit_address = false,
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.high_speed = false,
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.hs_master_code = 0x0,
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};
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uint16_t timeout = 0;
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enum status_code status = STATUS_BUSY;
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while (status != STATUS_OK) {
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status = i2c_master_read_packet_wait(&self->i2c_master_instance,
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&packet);
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/* Increment timeout counter and check if timed out. */
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if (timeout++ == TIMEOUT) {
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break;
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}
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}
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if (status == STATUS_OK) {
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return 0;
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} else if (status == STATUS_ERR_BAD_ADDRESS) {
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return MP_ENODEV;
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}
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return MP_EIO;
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}
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