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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_L4R5ZI_P/TOOLCHAIN_ARM_STD/i2c_device.h@172:65be27845400, 2019-02-20 (annotated)

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

Who changed what in which revision?

UserRevisionLine numberNew contents of line
AnnaBridge 172:65be27845400 1 /* mbed Microcontroller Library
AnnaBridge 172:65be27845400 2 *******************************************************************************
AnnaBridge 172:65be27845400 3 * Copyright (c) 2015, STMicroelectronics
AnnaBridge 172:65be27845400 4 * All rights reserved.
AnnaBridge 172:65be27845400 5 *
AnnaBridge 172:65be27845400 6 * Redistribution and use in source and binary forms, with or without
AnnaBridge 172:65be27845400 7 * modification, are permitted provided that the following conditions are met:
AnnaBridge 172:65be27845400 8 *
AnnaBridge 172:65be27845400 9 * 1. Redistributions of source code must retain the above copyright notice,
AnnaBridge 172:65be27845400 10 * this list of conditions and the following disclaimer.
AnnaBridge 172:65be27845400 11 * 2. Redistributions in binary form must reproduce the above copyright notice,
AnnaBridge 172:65be27845400 12 * this list of conditions and the following disclaimer in the documentation
AnnaBridge 172:65be27845400 13 * and/or other materials provided with the distribution.
AnnaBridge 172:65be27845400 14 * 3. Neither the name of STMicroelectronics nor the names of its contributors
AnnaBridge 172:65be27845400 15 * may be used to endorse or promote products derived from this software
AnnaBridge 172:65be27845400 16 * without specific prior written permission.
AnnaBridge 172:65be27845400 17 *
AnnaBridge 172:65be27845400 18 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
AnnaBridge 172:65be27845400 19 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
AnnaBridge 172:65be27845400 20 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
AnnaBridge 172:65be27845400 21 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
AnnaBridge 172:65be27845400 22 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
AnnaBridge 172:65be27845400 23 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
AnnaBridge 172:65be27845400 24 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
AnnaBridge 172:65be27845400 25 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
AnnaBridge 172:65be27845400 26 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
AnnaBridge 172:65be27845400 27 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
AnnaBridge 172:65be27845400 28 *******************************************************************************
AnnaBridge 172:65be27845400 29 */
AnnaBridge 172:65be27845400 30 #ifndef MBED_I2C_DEVICE_H
AnnaBridge 172:65be27845400 31 #define MBED_I2C_DEVICE_H
AnnaBridge 172:65be27845400 32
AnnaBridge 172:65be27845400 33 #include "cmsis.h"
AnnaBridge 172:65be27845400 34
AnnaBridge 172:65be27845400 35 #ifdef __cplusplus
AnnaBridge 172:65be27845400 36 extern "C" {
AnnaBridge 172:65be27845400 37 #endif
AnnaBridge 172:65be27845400 38
AnnaBridge 172:65be27845400 39 #if DEVICE_I2C
AnnaBridge 172:65be27845400 40
AnnaBridge 172:65be27845400 41 #define I2C_IP_VERSION_V2
AnnaBridge 172:65be27845400 42
AnnaBridge 172:65be27845400 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 172:65be27845400 44
AnnaBridge 172:65be27845400 45 /* Family specifc settings for clock source */
AnnaBridge 172:65be27845400 46 #define I2CAPI_I2C1_CLKSRC RCC_I2C1CLKSOURCE_SYSCLK
AnnaBridge 172:65be27845400 47 #define I2CAPI_I2C2_CLKSRC RCC_I2C2CLKSOURCE_SYSCLK
AnnaBridge 172:65be27845400 48 #define I2CAPI_I2C3_CLKSRC RCC_I2C3CLKSOURCE_SYSCLK
AnnaBridge 172:65be27845400 49 #define I2CAPI_I2C4_CLKSRC RCC_I2C4CLKSOURCE_SYSCLK
AnnaBridge 172:65be27845400 50
AnnaBridge 172:65be27845400 51 /* Provide the suitable timing depending on requested frequencie */
AnnaBridge 172:65be27845400 52 static inline uint32_t get_i2c_timing(int hz)
AnnaBridge 172:65be27845400 53 {
AnnaBridge 172:65be27845400 54 uint32_t tim = 0;
AnnaBridge 172:65be27845400 55 if (SystemCoreClock == 80000000) {
AnnaBridge 172:65be27845400 56 // Common settings: I2C clock = 80 MHz, Analog filter = ON, Digital filter coefficient = 0
AnnaBridge 172:65be27845400 57 switch (hz) {
AnnaBridge 172:65be27845400 58 case 100000:
AnnaBridge 172:65be27845400 59 tim = 0x30C14E6B; // Standard mode with Rise Time = 400ns and Fall Time = 100ns
AnnaBridge 172:65be27845400 60 break;
AnnaBridge 172:65be27845400 61 case 400000:
AnnaBridge 172:65be27845400 62 tim = 0x10D1143A; // Fast mode with Rise Time = 250ns and Fall Time = 100ns
AnnaBridge 172:65be27845400 63 break;
AnnaBridge 172:65be27845400 64 case 1000000:
AnnaBridge 172:65be27845400 65 tim = 0x00810E27; // Fast mode Plus with Rise Time = 60ns and Fall Time = 100ns
AnnaBridge 172:65be27845400 66 break;
AnnaBridge 172:65be27845400 67 default:
AnnaBridge 172:65be27845400 68 break;
AnnaBridge 172:65be27845400 69 }
AnnaBridge 172:65be27845400 70 } else if (SystemCoreClock == 48000000) {
AnnaBridge 172:65be27845400 71 // Common settings: I2C clock = 48 MHz, Analog filter = ON, Digital filter coefficient = 0
AnnaBridge 172:65be27845400 72 switch (hz) {
AnnaBridge 172:65be27845400 73 case 100000:
AnnaBridge 172:65be27845400 74 tim = 0x20A03E55; // Standard mode with Rise Time = 400ns and Fall Time = 100ns
AnnaBridge 172:65be27845400 75 break;
AnnaBridge 172:65be27845400 76 case 400000:
AnnaBridge 172:65be27845400 77 tim = 0x10800C21; // Fast mode with Rise Time = 250ns and Fall Time = 100ns
AnnaBridge 172:65be27845400 78 break;
AnnaBridge 172:65be27845400 79 case 1000000:
AnnaBridge 172:65be27845400 80 tim = 0x00500816; // Fast mode Plus with Rise Time = 60ns and Fall Time = 100ns
AnnaBridge 172:65be27845400 81 break;
AnnaBridge 172:65be27845400 82 default:
AnnaBridge 172:65be27845400 83 break;
AnnaBridge 172:65be27845400 84 }
AnnaBridge 172:65be27845400 85 }
AnnaBridge 172:65be27845400 86 return tim;
AnnaBridge 172:65be27845400 87 }
AnnaBridge 172:65be27845400 88
AnnaBridge 172:65be27845400 89 #ifdef __cplusplus
AnnaBridge 172:65be27845400 90 }
AnnaBridge 172:65be27845400 91 #endif
AnnaBridge 172:65be27845400 92
AnnaBridge 172:65be27845400 93 #endif // DEVICE_I2C
AnnaBridge 172:65be27845400 94
AnnaBridge 172:65be27845400 95 #endif