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The official Mbed 2 C/C++ SDK provides the software platform and libraries to build your applications.

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mbed 2

This is the mbed 2 library. If you'd like to learn about Mbed OS please see the mbed-os docs.

TARGET_NUCLEO_F746ZG/TOOLCHAIN_ARM_MICRO/i2c_device.h@172:65be27845400, 2019-02-20 (annotated)

Committer:
AnnaBridge
Date:
Wed Feb 20 20:53:29 2019 +0000
Revision:
172:65be27845400
Parent:
171:3a7713b1edbc 
mbed library release version 165

Who changed what in which revision?

UserRevisionLine numberNew contents of line
AnnaBridge 171:3a7713b1edbc 1 /* mbed Microcontroller Library
AnnaBridge 171:3a7713b1edbc 2 *******************************************************************************
AnnaBridge 171:3a7713b1edbc 3 * Copyright (c) 2015, STMicroelectronics
AnnaBridge 171:3a7713b1edbc 4 * All rights reserved.
AnnaBridge 171:3a7713b1edbc 5 *
AnnaBridge 171:3a7713b1edbc 6 * Redistribution and use in source and binary forms, with or without
AnnaBridge 171:3a7713b1edbc 7 * modification, are permitted provided that the following conditions are met:
AnnaBridge 171:3a7713b1edbc 8 *
AnnaBridge 171:3a7713b1edbc 9 * 1. Redistributions of source code must retain the above copyright notice,
AnnaBridge 171:3a7713b1edbc 10 * this list of conditions and the following disclaimer.
AnnaBridge 171:3a7713b1edbc 11 * 2. Redistributions in binary form must reproduce the above copyright notice,
AnnaBridge 171:3a7713b1edbc 12 * this list of conditions and the following disclaimer in the documentation
AnnaBridge 171:3a7713b1edbc 13 * and/or other materials provided with the distribution.
AnnaBridge 171:3a7713b1edbc 14 * 3. Neither the name of STMicroelectronics nor the names of its contributors
AnnaBridge 171:3a7713b1edbc 15 * may be used to endorse or promote products derived from this software
AnnaBridge 171:3a7713b1edbc 16 * without specific prior written permission.
AnnaBridge 171:3a7713b1edbc 17 *
AnnaBridge 171:3a7713b1edbc 18 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
AnnaBridge 171:3a7713b1edbc 19 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
AnnaBridge 171:3a7713b1edbc 20 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
AnnaBridge 171:3a7713b1edbc 21 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
AnnaBridge 171:3a7713b1edbc 22 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
AnnaBridge 171:3a7713b1edbc 23 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
AnnaBridge 171:3a7713b1edbc 24 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
AnnaBridge 171:3a7713b1edbc 25 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
AnnaBridge 171:3a7713b1edbc 26 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
AnnaBridge 171:3a7713b1edbc 27 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
AnnaBridge 171:3a7713b1edbc 28 *******************************************************************************
AnnaBridge 171:3a7713b1edbc 29 */
AnnaBridge 171:3a7713b1edbc 30 #ifndef MBED_I2C_DEVICE_H
AnnaBridge 171:3a7713b1edbc 31 #define MBED_I2C_DEVICE_H
AnnaBridge 171:3a7713b1edbc 32
AnnaBridge 171:3a7713b1edbc 33 #include "cmsis.h"
AnnaBridge 171:3a7713b1edbc 34
AnnaBridge 171:3a7713b1edbc 35 #ifdef __cplusplus
AnnaBridge 171:3a7713b1edbc 36 extern "C" {
AnnaBridge 171:3a7713b1edbc 37 #endif
AnnaBridge 171:3a7713b1edbc 38
AnnaBridge 172:65be27845400 39 #if DEVICE_I2C
AnnaBridge 171:3a7713b1edbc 40
AnnaBridge 171:3a7713b1edbc 41 #define I2C_IP_VERSION_V2
AnnaBridge 171:3a7713b1edbc 42
AnnaBridge 171:3a7713b1edbc 43 #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)
AnnaBridge 171:3a7713b1edbc 44
AnnaBridge 171:3a7713b1edbc 45 /* Family specifc settings for clock source */
AnnaBridge 171:3a7713b1edbc 46 #define I2CAPI_I2C1_CLKSRC RCC_I2C1CLKSOURCE_PCLK1
AnnaBridge 171:3a7713b1edbc 47 #define I2CAPI_I2C2_CLKSRC RCC_I2C2CLKSOURCE_PCLK1
AnnaBridge 171:3a7713b1edbc 48 #define I2CAPI_I2C3_CLKSRC RCC_I2C3CLKSOURCE_PCLK1
AnnaBridge 171:3a7713b1edbc 49 #define I2CAPI_I2C4_CLKSRC RCC_I2C4CLKSOURCE_PCLK1
AnnaBridge 171:3a7713b1edbc 50
AnnaBridge 171:3a7713b1edbc 51 /* Provide the suitable timing depending on requested frequencie */
AnnaBridge 171:3a7713b1edbc 52 static inline uint32_t get_i2c_timing(int hz)
AnnaBridge 171:3a7713b1edbc 53 {
AnnaBridge 171:3a7713b1edbc 54 uint32_t tim = 0;
AnnaBridge 171:3a7713b1edbc 55 /*
AnnaBridge 171:3a7713b1edbc 56 Values calculated with I2C_Timing_Configuration tool (excel file)
AnnaBridge 171:3a7713b1edbc 57 * Standard mode (up to 100 kHz)
AnnaBridge 171:3a7713b1edbc 58 * Fast Mode (up to 400 kHz)
AnnaBridge 171:3a7713b1edbc 59 * Fast Mode Plus (up to 1 MHz)
AnnaBridge 171:3a7713b1edbc 60 Below values obtained with:
AnnaBridge 171:3a7713b1edbc 61 - I2Cx clock source = APB1CLK = 54 MHz
AnnaBridge 171:3a7713b1edbc 62 - Analog filter delay = ON
AnnaBridge 171:3a7713b1edbc 63 - Digital filter coefficient = 0
AnnaBridge 171:3a7713b1edbc 64 */
AnnaBridge 171:3a7713b1edbc 65 switch (hz) {
AnnaBridge 171:3a7713b1edbc 66 case 100000:
AnnaBridge 171:3a7713b1edbc 67 tim = 0x10916998; // Standard mode with Rise time = 120ns, Fall time = 120ns
AnnaBridge 171:3a7713b1edbc 68 break;
AnnaBridge 171:3a7713b1edbc 69 case 400000:
AnnaBridge 171:3a7713b1edbc 70 tim = 0x00B11B54; // Fast Mode with Rise time = 120ns, Fall time = 120ns
AnnaBridge 171:3a7713b1edbc 71 break;
AnnaBridge 171:3a7713b1edbc 72 case 1000000:
AnnaBridge 171:3a7713b1edbc 73 tim = 0x0090091B; // Fast Mode Plus with Rise time = 120ns, Fall time = 10ns
AnnaBridge 171:3a7713b1edbc 74 break;
AnnaBridge 171:3a7713b1edbc 75 default:
AnnaBridge 171:3a7713b1edbc 76 break;
AnnaBridge 171:3a7713b1edbc 77 }
AnnaBridge 171:3a7713b1edbc 78 return tim;
AnnaBridge 171:3a7713b1edbc 79 }
AnnaBridge 171:3a7713b1edbc 80
AnnaBridge 171:3a7713b1edbc 81 #ifdef __cplusplus
AnnaBridge 171:3a7713b1edbc 82 }
AnnaBridge 171:3a7713b1edbc 83 #endif
AnnaBridge 171:3a7713b1edbc 84
AnnaBridge 171:3a7713b1edbc 85 #endif // DEVICE_I2C
AnnaBridge 171:3a7713b1edbc 86
AnnaBridge 171:3a7713b1edbc 87 #endif