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I2C: Make I2C clock frequency accurate

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This commit is contained in:
Cao Sen Miao
2022-06-27 12:00:04 +08:00
parent cf41c255bb
commit e218723e0e
11 changed files with 293 additions and 50 deletions
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51
components/hal/esp32s2/include/hal/i2c_ll.h
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@@ -1,16 +1,8 @@
// Copyright 2015-2019 Espressif Systems (Shanghai) PTE LTD
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
/*
* SPDX-FileCopyrightText: 2015-2022 Espressif Systems (Shanghai) CO LTD
*
* SPDX-License-Identifier: Apache-2.0
*/
// The LL layer for I2C register operations
@@ -907,6 +899,39 @@ static inline void i2c_ll_update(i2c_dev_t *hw)
;// ESP32S2 do not support
}
/**
* @brief Configure I2C SCL timing
*
* @param hw Beginning address of the peripheral registers
* @param high_period The I2C SCL hight period (in core clock cycle, hight_period > 2)
* @param low_period The I2C SCL low period (in core clock cycle, low_period > 1)
* @param wait_high_period The I2C SCL wait rising edge period.
*
* @return None.
*/
static inline void i2c_ll_set_scl_clk_timing(i2c_dev_t *hw, int high_period, int low_period, int wait_high_period)
{
hw->scl_low_period.period = low_period;
hw->scl_high_period.period = high_period;
hw->scl_high_period.scl_wait_high_period = wait_high_period;
}
/**
* @brief Get I2C SCL timing configuration
*
* @param hw Beginning address of the peripheral registers
* @param high_period Pointer to accept the SCL high period
* @param low_period Pointer to accept the SCL low period
*
* @return None
*/
static inline void i2c_ll_get_scl_clk_timing(i2c_dev_t *hw, int *high_period, int *low_period, int *wait_high_period)
{
*high_period = hw->scl_high_period.period;
*wait_high_period = hw->scl_high_period.scl_wait_high_period;
*low_period = hw->scl_low_period.period;
}
#ifdef __cplusplus
}
#endif