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- /* mbed Microcontroller Library
- *******************************************************************************
- * Copyright (c) 2015, STMicroelectronics
- * All rights reserved.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions are met:
- *
- * 1. Redistributions of source code must retain the above copyright notice,
- * this list of conditions and the following disclaimer.
- * 2. Redistributions in binary form must reproduce the above copyright notice,
- * this list of conditions and the following disclaimer in the documentation
- * and/or other materials provided with the distribution.
- * 3. Neither the name of STMicroelectronics nor the names of its contributors
- * may be used to endorse or promote products derived from this software
- * without specific prior written permission.
- *
- * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
- * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
- * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
- * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
- * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
- * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
- * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
- * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
- * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
- * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
- *******************************************************************************
- */
- #ifndef MBED_I2C_DEVICE_H
- #define MBED_I2C_DEVICE_H
- #include "cmsis.h"
- #ifdef __cplusplus
- extern "C" {
- #endif
- #ifdef DEVICE_I2C
- #define I2C_IP_VERSION_V2
- #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)
- /* Family specifc settings for clock source */
- #define I2CAPI_I2C1_CLKSRC RCC_I2C1CLKSOURCE_SYSCLK
- #define I2CAPI_I2C2_CLKSRC RCC_I2C2CLKSOURCE_SYSCLK
- #define I2CAPI_I2C3_CLKSRC RCC_I2C3CLKSOURCE_SYSCLK
- #define I2CAPI_I2C4_CLKSRC RCC_I2C4CLKSOURCE_SYSCLK
- /* Provide the suitable timing depending on requested frequencie */
- static inline uint32_t get_i2c_timing(int hz)
- {
- uint32_t tim = 0;
- if (SystemCoreClock == 80000000) {
- // Common settings: I2C clock = 80 MHz, Analog filter = ON, Digital filter coefficient = 0
- switch (hz) {
- case 100000:
- tim = 0x30C14E6B; // Standard mode with Rise Time = 400ns and Fall Time = 100ns
- break;
- case 400000:
- tim = 0x10D1143A; // Fast mode with Rise Time = 250ns and Fall Time = 100ns
- break;
- case 1000000:
- tim = 0x00810E27; // Fast mode Plus with Rise Time = 60ns and Fall Time = 100ns
- break;
- default:
- break;
- }
- } else if (SystemCoreClock == 48000000) {
- // Common settings: I2C clock = 48 MHz, Analog filter = ON, Digital filter coefficient = 0
- switch (hz) {
- case 100000:
- tim = 0x20A03E55; // Standard mode with Rise Time = 400ns and Fall Time = 100ns
- break;
- case 400000:
- tim = 0x10800C21; // Fast mode with Rise Time = 250ns and Fall Time = 100ns
- break;
- case 1000000:
- tim = 0x00500816; // Fast mode Plus with Rise Time = 60ns and Fall Time = 100ns
- break;
- default:
- break;
- }
- }
- return tim;
- }
- #ifdef __cplusplus
- }
- #endif
- #endif // DEVICE_I2C
- #endif
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