554 lines
18 KiB
C
554 lines
18 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 Damien P. George
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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 <stdio.h>
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#include <string.h>
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#include "py/runtime.h"
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#include "py/mphal.h"
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#include "py/mperrno.h"
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#include "extmod/machine_i2c.h"
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#include "i2c.h"
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#if MICROPY_HW_ENABLE_HW_I2C
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STATIC const mp_obj_type_t machine_hard_i2c_type;
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#if defined(STM32F4)
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// F4xx specific driver for I2C hardware peripheral
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// The hardware-specific I2C code below is based heavily on the code from
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// V1.5.2 of the STM32 CUBE F4 HAL. Its copyright notice is given here.
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/*
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* COPYRIGHT(c) 2016 STMicroelectronics
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*
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* Redistribution and use in source and binary forms, with or without modification,
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* are permitted provided that the following conditions are met:
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* 1. Redistributions of source code must retain the above copyright notice,
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* this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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* 3. Neither the name of STMicroelectronics nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
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* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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typedef struct _machine_hard_i2c_obj_t {
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mp_obj_base_t base;
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const pyb_i2c_obj_t *pyb;
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uint32_t *timeout;
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} machine_hard_i2c_obj_t;
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STATIC uint32_t machine_hard_i2c_timeout[4];
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STATIC const machine_hard_i2c_obj_t machine_hard_i2c_obj[] = {
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{{&machine_hard_i2c_type}, &pyb_i2c_obj[0], &machine_hard_i2c_timeout[0]},
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{{&machine_hard_i2c_type}, &pyb_i2c_obj[1], &machine_hard_i2c_timeout[1]},
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{{&machine_hard_i2c_type}, &pyb_i2c_obj[2], &machine_hard_i2c_timeout[2]},
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{{&machine_hard_i2c_type}, &pyb_i2c_obj[3], &machine_hard_i2c_timeout[3]},
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};
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STATIC void machine_hard_i2c_print(const mp_print_t *print, mp_obj_t self_in, mp_print_kind_t kind) {
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machine_hard_i2c_obj_t *self = MP_OBJ_TO_PTR(self_in);
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mp_printf(print, "I2C(%u, freq=%u, timeout=%u)",
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self - &machine_hard_i2c_obj[0] + 1,
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i2c_get_baudrate(self->pyb->i2c),
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*self->timeout);
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}
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STATIC void machine_hard_i2c_init(const machine_hard_i2c_obj_t *self, uint32_t freq, uint32_t timeout) {
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*self->timeout = timeout;
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i2c_init_freq(self->pyb, freq);
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}
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// this function is based on STM code
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STATIC bool I2C_IsAcknowledgeFailed(I2C_HandleTypeDef *hi2c) {
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if (__HAL_I2C_GET_FLAG(hi2c, I2C_FLAG_AF) == SET) {
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/* Clear NACKF Flag */
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__HAL_I2C_CLEAR_FLAG(hi2c, I2C_FLAG_AF);
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return true;
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}
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return false;
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}
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// this function is based on STM code
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STATIC bool I2C_WaitOnFlagUntilTimeout(I2C_HandleTypeDef *hi2c, uint32_t Flag, FlagStatus Status, uint32_t Timeout, uint32_t Tickstart) {
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/* Wait until flag is set */
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while ((__HAL_I2C_GET_FLAG(hi2c, Flag) ? SET : RESET) == Status) {
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if (Timeout != HAL_MAX_DELAY) {
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if ((Timeout == 0U)||((HAL_GetTick() - Tickstart ) > Timeout)) {
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return false;
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}
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}
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}
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return true;
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}
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// this function is based on STM code
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STATIC int I2C_WaitOnRXNEFlagUntilTimeout(I2C_HandleTypeDef *hi2c, uint32_t Timeout, uint32_t Tickstart) {
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while (__HAL_I2C_GET_FLAG(hi2c, I2C_FLAG_RXNE) == RESET) {
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/* Check if a STOPF is detected */
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if (__HAL_I2C_GET_FLAG(hi2c, I2C_FLAG_STOPF) == SET) {
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/* Clear STOP Flag */
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__HAL_I2C_CLEAR_FLAG(hi2c, I2C_FLAG_STOPF);
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return -MP_EBUSY;
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}
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/* Check for the Timeout */
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if ((Timeout == 0U) || ((HAL_GetTick()-Tickstart) > Timeout)) {
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return -MP_ETIMEDOUT;
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}
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}
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return 0;
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}
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// this function is based on STM code
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STATIC int send_addr_byte(I2C_HandleTypeDef *hi2c, uint8_t addr_byte, uint32_t Timeout, uint32_t Tickstart) {
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/* Generate Start */
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hi2c->Instance->CR1 |= I2C_CR1_START;
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/* Wait until SB flag is set */
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if (!I2C_WaitOnFlagUntilTimeout(hi2c, I2C_FLAG_SB, RESET, Timeout, Tickstart)) {
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return -MP_ETIMEDOUT;
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}
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/* Send slave address */
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hi2c->Instance->DR = addr_byte;
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/* Wait until ADDR flag is set */
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while (__HAL_I2C_GET_FLAG(hi2c, I2C_FLAG_ADDR) == RESET) {
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if (__HAL_I2C_GET_FLAG(hi2c, I2C_FLAG_AF) == SET) {
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// nack received for addr, release the bus cleanly
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hi2c->Instance->CR1 |= I2C_CR1_STOP;
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__HAL_I2C_CLEAR_FLAG(hi2c, I2C_FLAG_AF);
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return -MP_ENODEV;
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}
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/* Check for the Timeout */
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if (Timeout != HAL_MAX_DELAY) {
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if ((Timeout == 0U)||((HAL_GetTick() - Tickstart ) > Timeout)) {
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return -MP_ETIMEDOUT;
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}
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}
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}
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return 0;
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}
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// this function is based on STM code
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int machine_hard_i2c_readfrom(mp_obj_base_t *self_in, uint16_t addr, uint8_t *dest, size_t len, bool stop) {
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machine_hard_i2c_obj_t *self = (machine_hard_i2c_obj_t*)self_in;
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I2C_HandleTypeDef *hi2c = self->pyb->i2c;
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uint32_t Timeout = *self->timeout;
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/* Init tickstart for timeout management*/
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uint32_t tickstart = HAL_GetTick();
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#if 0
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// TODO: for multi-master, here we could wait for the bus to be free
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// we'd need a flag to tell if we were in the middle of a set of transactions
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// (ie didn't send a stop bit in the last call)
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/* Wait until BUSY flag is reset */
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if (!I2C_WaitOnFlagUntilTimeout(hi2c, I2C_FLAG_BUSY, SET, I2C_TIMEOUT_BUSY_FLAG, tickstart)) {
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return -MP_EBUSY;
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}
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#endif
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/* Check if the I2C is already enabled */
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if ((hi2c->Instance->CR1 & I2C_CR1_PE) != I2C_CR1_PE) {
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/* Enable I2C peripheral */
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__HAL_I2C_ENABLE(hi2c);
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}
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/* Disable Pos */
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hi2c->Instance->CR1 &= ~I2C_CR1_POS;
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/* Enable Acknowledge */
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hi2c->Instance->CR1 |= I2C_CR1_ACK;
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/* Send Slave Address */
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int ret = send_addr_byte(hi2c, I2C_7BIT_ADD_READ(addr << 1), Timeout, tickstart);
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if (ret != 0) {
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return ret;
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}
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if (len == 0U) {
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/* Clear ADDR flag */
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__HAL_I2C_CLEAR_ADDRFLAG(hi2c);
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/* Generate Stop */
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if (stop) {
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hi2c->Instance->CR1 |= I2C_CR1_STOP;
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}
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} else if (len == 1U) {
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/* Disable Acknowledge */
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hi2c->Instance->CR1 &= ~I2C_CR1_ACK;
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/* Clear ADDR flag */
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__HAL_I2C_CLEAR_ADDRFLAG(hi2c);
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/* Generate Stop */
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if (stop) {
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hi2c->Instance->CR1 |= I2C_CR1_STOP;
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}
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} else if (len == 2U) {
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/* Disable Acknowledge */
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hi2c->Instance->CR1 &= ~I2C_CR1_ACK;
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/* Enable Pos */
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hi2c->Instance->CR1 |= I2C_CR1_POS;
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/* Clear ADDR flag */
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__HAL_I2C_CLEAR_ADDRFLAG(hi2c);
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} else {
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/* Enable Acknowledge */
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hi2c->Instance->CR1 |= I2C_CR1_ACK;
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/* Clear ADDR flag */
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__HAL_I2C_CLEAR_ADDRFLAG(hi2c);
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}
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while (len > 0U) {
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if (len <= 3U) {
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if (len == 1U) {
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/* Wait until RXNE flag is set */
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int ret = I2C_WaitOnRXNEFlagUntilTimeout(hi2c, Timeout, tickstart);
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if (ret != 0) {
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return ret;
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}
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/* Read data from DR */
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*dest++ = hi2c->Instance->DR;
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len--;
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} else if (len == 2U) {
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/* Wait until BTF flag is set */
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if (!I2C_WaitOnFlagUntilTimeout(hi2c, I2C_FLAG_BTF, RESET, Timeout, tickstart)) {
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return -MP_ETIMEDOUT;
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}
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/* Generate Stop */
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if (stop) {
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hi2c->Instance->CR1 |= I2C_CR1_STOP;
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}
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/* Read data from DR */
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*dest++ = hi2c->Instance->DR;
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len--;
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/* Read data from DR */
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*dest++ = hi2c->Instance->DR;
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len--;
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} else {
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/* Wait until BTF flag is set */
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if (!I2C_WaitOnFlagUntilTimeout(hi2c, I2C_FLAG_BTF, RESET, Timeout, tickstart)) {
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return -MP_ETIMEDOUT;
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}
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/* Disable Acknowledge */
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hi2c->Instance->CR1 &= ~I2C_CR1_ACK;
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/* Read data from DR */
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*dest++ = hi2c->Instance->DR;
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len--;
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/* Wait until BTF flag is set */
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if (!I2C_WaitOnFlagUntilTimeout(hi2c, I2C_FLAG_BTF, RESET, Timeout, tickstart)) {
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return -MP_ETIMEDOUT;
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}
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/* Generate Stop */
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if (stop) {
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hi2c->Instance->CR1 |= I2C_CR1_STOP;
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}
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/* Read data from DR */
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*dest++ = hi2c->Instance->DR;
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len--;
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/* Read data from DR */
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*dest++ = hi2c->Instance->DR;
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len--;
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}
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} else {
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/* Wait until RXNE flag is set */
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int ret = I2C_WaitOnRXNEFlagUntilTimeout(hi2c, Timeout, tickstart);
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if (ret != 0) {
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return ret;
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}
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/* Read data from DR */
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*dest++ = hi2c->Instance->DR;
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len--;
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if (__HAL_I2C_GET_FLAG(hi2c, I2C_FLAG_BTF) == SET) {
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/* Read data from DR */
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*dest++ = hi2c->Instance->DR;
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len--;
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}
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}
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}
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return 0;
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}
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// this function is based on STM code
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int machine_hard_i2c_writeto(mp_obj_base_t *self_in, uint16_t addr, const uint8_t *src, size_t len, bool stop) {
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machine_hard_i2c_obj_t *self = (machine_hard_i2c_obj_t*)self_in;
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I2C_HandleTypeDef *hi2c = self->pyb->i2c;
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uint32_t Timeout = *self->timeout;
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/* Init tickstart for timeout management*/
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uint32_t tickstart = HAL_GetTick();
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#if 0
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// TODO: for multi-master, here we could wait for the bus to be free
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// we'd need a flag to tell if we were in the middle of a set of transactions
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// (ie didn't send a stop bit in the last call)
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/* Wait until BUSY flag is reset */
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if (!I2C_WaitOnFlagUntilTimeout(hi2c, I2C_FLAG_BUSY, SET, I2C_TIMEOUT_BUSY_FLAG, tickstart)) {
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return -MP_EBUSY;
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}
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#endif
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/* Check if the I2C is already enabled */
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if ((hi2c->Instance->CR1 & I2C_CR1_PE) != I2C_CR1_PE) {
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/* Enable I2C peripheral */
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__HAL_I2C_ENABLE(hi2c);
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}
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/* Disable Pos */
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hi2c->Instance->CR1 &= ~I2C_CR1_POS;
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/* Send Slave Address */
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int ret = send_addr_byte(hi2c, I2C_7BIT_ADD_WRITE(addr << 1), Timeout, tickstart);
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if (ret != 0) {
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return ret;
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}
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/* Clear ADDR flag */
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__HAL_I2C_CLEAR_ADDRFLAG(hi2c);
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int num_acks = 0;
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while (len > 0U) {
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/* Wait until TXE flag is set */
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while (__HAL_I2C_GET_FLAG(hi2c, I2C_FLAG_TXE) == RESET) {
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/* Check if a NACK is detected */
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if (I2C_IsAcknowledgeFailed(hi2c)) {
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goto nack;
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}
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/* Check for the Timeout */
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if (Timeout != HAL_MAX_DELAY) {
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if ((Timeout == 0U) || ((HAL_GetTick()-tickstart) > Timeout)) {
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goto timeout;
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}
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}
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}
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/* Write data to DR */
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hi2c->Instance->DR = *src++;
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len--;
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/* Wait until BTF flag is set */
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while (__HAL_I2C_GET_FLAG(hi2c, I2C_FLAG_BTF) == RESET) {
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/* Check if a NACK is detected */
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if (I2C_IsAcknowledgeFailed(hi2c)) {
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goto nack;
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}
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/* Check for the Timeout */
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if (Timeout != HAL_MAX_DELAY) {
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if ((Timeout == 0U) || ((HAL_GetTick()-tickstart) > Timeout)) {
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goto timeout;
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}
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}
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}
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++num_acks;
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}
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nack:
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/* Generate Stop */
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if (stop) {
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hi2c->Instance->CR1 |= I2C_CR1_STOP;
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}
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return num_acks;
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timeout:
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// timeout, release the bus cleanly
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hi2c->Instance->CR1 |= I2C_CR1_STOP;
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return -MP_ETIMEDOUT;
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}
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#else
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// No hardware I2C driver for this MCU so use the software implementation
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typedef mp_machine_soft_i2c_obj_t machine_hard_i2c_obj_t;
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STATIC machine_hard_i2c_obj_t machine_hard_i2c_obj[] = {
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#if defined(MICROPY_HW_I2C1_SCL)
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{{&machine_hard_i2c_type}, 1, 500, MICROPY_HW_I2C1_SCL, MICROPY_HW_I2C1_SDA},
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#else
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{{NULL}, 0, 0, NULL, NULL},
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#endif
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#if defined(MICROPY_HW_I2C2_SCL)
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{{&machine_hard_i2c_type}, 1, 500, MICROPY_HW_I2C2_SCL, MICROPY_HW_I2C2_SDA},
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#else
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{{NULL}, 0, 0, NULL, NULL},
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#endif
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#if defined(MICROPY_HW_I2C3_SCL)
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{{&machine_hard_i2c_type}, 1, 500, MICROPY_HW_I2C3_SCL, MICROPY_HW_I2C3_SDA},
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#else
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{{NULL}, 0, 0, NULL, NULL},
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#endif
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#if defined(MICROPY_HW_I2C4_SCL)
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{{&machine_hard_i2c_type}, 1, 500, MICROPY_HW_I2C4_SCL, MICROPY_HW_I2C4_SDA},
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#else
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{{NULL}, 0, 0, NULL, NULL},
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#endif
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};
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STATIC void machine_hard_i2c_print(const mp_print_t *print, mp_obj_t self_in, mp_print_kind_t kind) {
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machine_hard_i2c_obj_t *self = MP_OBJ_TO_PTR(self_in);
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mp_printf(print, "I2C(%u, scl=%q, sda=%q, freq=%u, timeout=%u)",
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self - &machine_hard_i2c_obj[0] + 1,
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self->scl->name, self->sda->name, 500000 / self->us_delay, self->us_timeout);
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}
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STATIC void machine_hard_i2c_init(machine_hard_i2c_obj_t *self, uint32_t freq, uint32_t timeout) {
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// set parameters
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if (freq >= 1000000) {
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// allow fastest possible bit-bang rate
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self->us_delay = 0;
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} else {
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self->us_delay = 500000 / freq;
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if (self->us_delay == 0) {
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self->us_delay = 1;
|
|
}
|
|
}
|
|
|
|
self->us_timeout = timeout;
|
|
|
|
// init pins
|
|
mp_hal_pin_open_drain(self->scl);
|
|
mp_hal_pin_open_drain(self->sda);
|
|
}
|
|
|
|
#define machine_hard_i2c_readfrom mp_machine_soft_i2c_readfrom
|
|
#define machine_hard_i2c_writeto mp_machine_soft_i2c_writeto
|
|
|
|
#endif
|
|
|
|
/******************************************************************************/
|
|
/* MicroPython bindings for machine API */
|
|
|
|
mp_obj_t machine_hard_i2c_make_new(const mp_obj_type_t *type, size_t n_args, size_t n_kw, const mp_obj_t *all_args) {
|
|
// parse args
|
|
enum { ARG_id, ARG_scl, ARG_sda, ARG_freq, ARG_timeout };
|
|
static const mp_arg_t allowed_args[] = {
|
|
{ MP_QSTR_id, MP_ARG_REQUIRED | MP_ARG_OBJ },
|
|
{ MP_QSTR_scl, MP_ARG_KW_ONLY | MP_ARG_OBJ, {.u_obj = MP_OBJ_NULL} },
|
|
{ MP_QSTR_sda, MP_ARG_KW_ONLY | MP_ARG_OBJ, {.u_obj = MP_OBJ_NULL} },
|
|
{ MP_QSTR_freq, MP_ARG_KW_ONLY | MP_ARG_INT, {.u_int = 400000} },
|
|
{ MP_QSTR_timeout, MP_ARG_KW_ONLY | MP_ARG_INT, {.u_int = 1000} },
|
|
};
|
|
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);
|
|
|
|
// work out i2c bus
|
|
int i2c_id = 0;
|
|
if (MP_OBJ_IS_STR(args[ARG_id].u_obj)) {
|
|
const char *port = mp_obj_str_get_str(args[ARG_id].u_obj);
|
|
if (0) {
|
|
#ifdef MICROPY_HW_I2C1_NAME
|
|
} else if (strcmp(port, MICROPY_HW_I2C1_NAME) == 0) {
|
|
i2c_id = 1;
|
|
#endif
|
|
#ifdef MICROPY_HW_I2C2_NAME
|
|
} else if (strcmp(port, MICROPY_HW_I2C2_NAME) == 0) {
|
|
i2c_id = 2;
|
|
#endif
|
|
#ifdef MICROPY_HW_I2C3_NAME
|
|
} else if (strcmp(port, MICROPY_HW_I2C3_NAME) == 0) {
|
|
i2c_id = 3;
|
|
#endif
|
|
} else {
|
|
nlr_raise(mp_obj_new_exception_msg_varg(&mp_type_ValueError,
|
|
"I2C(%s) doesn't exist", port));
|
|
}
|
|
} else {
|
|
i2c_id = mp_obj_get_int(args[ARG_id].u_obj);
|
|
if (i2c_id < 1 || i2c_id > MP_ARRAY_SIZE(machine_hard_i2c_obj)
|
|
|| machine_hard_i2c_obj[i2c_id - 1].base.type == NULL) {
|
|
nlr_raise(mp_obj_new_exception_msg_varg(&mp_type_ValueError,
|
|
"I2C(%d) doesn't exist", i2c_id));
|
|
}
|
|
}
|
|
|
|
// get static peripheral object
|
|
machine_hard_i2c_obj_t *self = (machine_hard_i2c_obj_t*)&machine_hard_i2c_obj[i2c_id - 1];
|
|
|
|
// here we would check the scl/sda pins and configure them, but it's not implemented
|
|
if (args[ARG_scl].u_obj != MP_OBJ_NULL || args[ARG_sda].u_obj != MP_OBJ_NULL) {
|
|
mp_raise_ValueError("explicit choice of scl/sda is not implemented");
|
|
}
|
|
|
|
// initialise the I2C peripheral
|
|
machine_hard_i2c_init(self, args[ARG_freq].u_int, args[ARG_timeout].u_int);
|
|
|
|
return MP_OBJ_FROM_PTR(self);
|
|
}
|
|
|
|
STATIC const mp_machine_i2c_p_t machine_hard_i2c_p = {
|
|
.readfrom = machine_hard_i2c_readfrom,
|
|
.writeto = machine_hard_i2c_writeto,
|
|
};
|
|
|
|
STATIC const mp_obj_type_t machine_hard_i2c_type = {
|
|
{ &mp_type_type },
|
|
.name = MP_QSTR_I2C,
|
|
.print = machine_hard_i2c_print,
|
|
.make_new = machine_hard_i2c_make_new,
|
|
.protocol = &machine_hard_i2c_p,
|
|
.locals_dict = (mp_obj_dict_t*)&mp_machine_soft_i2c_locals_dict,
|
|
};
|
|
|
|
#endif // MICROPY_HW_ENABLE_HW_I2C
|