mirror of https://github.com/ARMmbed/mbed-os.git
96 lines
3.7 KiB
C
96 lines
3.7 KiB
C
/* mbed Microcontroller Library
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*******************************************************************************
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* Copyright (c) 2015, STMicroelectronics
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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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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*/
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#ifndef MBED_I2C_DEVICE_H
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#define MBED_I2C_DEVICE_H
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#include "cmsis.h"
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#ifdef __cplusplus
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extern "C" {
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#endif
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#if DEVICE_I2C
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#define I2C_IP_VERSION_V2
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#define I2C_IT_ALL (I2C_IT_ERRI|I2C_IT_TCI|I2C_IT_STOPI|I2C_IT_NACKI|I2C_IT_ADDRI|I2C_IT_RXI|I2C_IT_TXI)
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/* Family specifc settings for clock source */
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#define I2CAPI_I2C1_CLKSRC RCC_I2C1CLKSOURCE_SYSCLK
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#define I2CAPI_I2C2_CLKSRC RCC_I2C2CLKSOURCE_SYSCLK
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#define I2CAPI_I2C3_CLKSRC RCC_I2C3CLKSOURCE_SYSCLK
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#define I2CAPI_I2C4_CLKSRC RCC_I2C4CLKSOURCE_SYSCLK
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/* Provide the suitable timing depending on requested frequencie */
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static inline uint32_t get_i2c_timing(int hz)
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{
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uint32_t tim = 0;
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if (SystemCoreClock == 80000000) {
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// Common settings: I2C clock = 80 MHz, Analog filter = ON, Digital filter coefficient = 0
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switch (hz) {
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case 100000:
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tim = 0x30C14E6B; // Standard mode with Rise Time = 400ns and Fall Time = 100ns
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break;
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case 400000:
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tim = 0x10D1143A; // Fast mode with Rise Time = 250ns and Fall Time = 100ns
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break;
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case 1000000:
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tim = 0x00810E27; // Fast mode Plus with Rise Time = 60ns and Fall Time = 100ns
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break;
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default:
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break;
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}
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} else if (SystemCoreClock == 48000000) {
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// Common settings: I2C clock = 48 MHz, Analog filter = ON, Digital filter coefficient = 0
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switch (hz) {
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case 100000:
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tim = 0x20A03E55; // Standard mode with Rise Time = 400ns and Fall Time = 100ns
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break;
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case 400000:
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tim = 0x10800C21; // Fast mode with Rise Time = 250ns and Fall Time = 100ns
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break;
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case 1000000:
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tim = 0x00500816; // Fast mode Plus with Rise Time = 60ns and Fall Time = 100ns
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break;
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default:
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break;
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}
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}
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return tim;
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}
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#ifdef __cplusplus
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}
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#endif
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#endif // DEVICE_I2C
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#endif
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