mbed official / mbed

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_L433RC_P/TARGET_STM/TARGET_STM32L4/i2c_device.h@160:5571c4ff569f, 2018-01-17 (annotated)

Committer:
Anna Bridge
Date:
Wed Jan 17 16:13:02 2018 +0000
Revision:
160:5571c4ff569f
mbed library. Release version 158

Who changed what in which revision?

UserRevisionLine numberNew contents of line
Anna Bridge 160:5571c4ff569f 1 /* mbed Microcontroller Library
Anna Bridge 160:5571c4ff569f 2 *******************************************************************************
Anna Bridge 160:5571c4ff569f 3 * Copyright (c) 2015, STMicroelectronics
Anna Bridge 160:5571c4ff569f 4 * All rights reserved.
Anna Bridge 160:5571c4ff569f 5 *
Anna Bridge 160:5571c4ff569f 6 * Redistribution and use in source and binary forms, with or without
Anna Bridge 160:5571c4ff569f 7 * modification, are permitted provided that the following conditions are met:
Anna Bridge 160:5571c4ff569f 8 *
Anna Bridge 160:5571c4ff569f 9 * 1. Redistributions of source code must retain the above copyright notice,
Anna Bridge 160:5571c4ff569f 10 * this list of conditions and the following disclaimer.
Anna Bridge 160:5571c4ff569f 11 * 2. Redistributions in binary form must reproduce the above copyright notice,
Anna Bridge 160:5571c4ff569f 12 * this list of conditions and the following disclaimer in the documentation
Anna Bridge 160:5571c4ff569f 13 * and/or other materials provided with the distribution.
Anna Bridge 160:5571c4ff569f 14 * 3. Neither the name of STMicroelectronics nor the names of its contributors
Anna Bridge 160:5571c4ff569f 15 * may be used to endorse or promote products derived from this software
Anna Bridge 160:5571c4ff569f 16 * without specific prior written permission.
Anna Bridge 160:5571c4ff569f 17 *
Anna Bridge 160:5571c4ff569f 18 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
Anna Bridge 160:5571c4ff569f 19 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
Anna Bridge 160:5571c4ff569f 20 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
Anna Bridge 160:5571c4ff569f 21 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
Anna Bridge 160:5571c4ff569f 22 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
Anna Bridge 160:5571c4ff569f 23 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
Anna Bridge 160:5571c4ff569f 24 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
Anna Bridge 160:5571c4ff569f 25 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
Anna Bridge 160:5571c4ff569f 26 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
Anna Bridge 160:5571c4ff569f 27 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
Anna Bridge 160:5571c4ff569f 28 *******************************************************************************
Anna Bridge 160:5571c4ff569f 29 */
Anna Bridge 160:5571c4ff569f 30 #ifndef MBED_I2C_DEVICE_H
Anna Bridge 160:5571c4ff569f 31 #define MBED_I2C_DEVICE_H
Anna Bridge 160:5571c4ff569f 32
Anna Bridge 160:5571c4ff569f 33 #include "cmsis.h"
Anna Bridge 160:5571c4ff569f 34
Anna Bridge 160:5571c4ff569f 35 #ifdef __cplusplus
Anna Bridge 160:5571c4ff569f 36 extern "C" {
Anna Bridge 160:5571c4ff569f 37 #endif
Anna Bridge 160:5571c4ff569f 38
Anna Bridge 160:5571c4ff569f 39 #ifdef DEVICE_I2C
Anna Bridge 160:5571c4ff569f 40
Anna Bridge 160:5571c4ff569f 41 #define I2C_IP_VERSION_V2
Anna Bridge 160:5571c4ff569f 42
Anna Bridge 160:5571c4ff569f 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)
Anna Bridge 160:5571c4ff569f 44
Anna Bridge 160:5571c4ff569f 45 /* Family specifc settings for clock source */
Anna Bridge 160:5571c4ff569f 46 #define I2CAPI_I2C1_CLKSRC RCC_I2C1CLKSOURCE_SYSCLK
Anna Bridge 160:5571c4ff569f 47 #define I2CAPI_I2C2_CLKSRC RCC_I2C2CLKSOURCE_SYSCLK
Anna Bridge 160:5571c4ff569f 48 #define I2CAPI_I2C3_CLKSRC RCC_I2C3CLKSOURCE_SYSCLK
Anna Bridge 160:5571c4ff569f 49 #define I2CAPI_I2C4_CLKSRC RCC_I2C4CLKSOURCE_SYSCLK
Anna Bridge 160:5571c4ff569f 50
Anna Bridge 160:5571c4ff569f 51 /* Provide the suitable timing depending on requested frequencie */
Anna Bridge 160:5571c4ff569f 52 static inline uint32_t get_i2c_timing(int hz)
Anna Bridge 160:5571c4ff569f 53 {
Anna Bridge 160:5571c4ff569f 54 uint32_t tim = 0;
Anna Bridge 160:5571c4ff569f 55 if (SystemCoreClock == 80000000) {
Anna Bridge 160:5571c4ff569f 56 // Common settings: I2C clock = 80 MHz, Analog filter = ON, Digital filter coefficient = 0
Anna Bridge 160:5571c4ff569f 57 switch (hz) {
Anna Bridge 160:5571c4ff569f 58 case 100000:
Anna Bridge 160:5571c4ff569f 59 tim = 0x30C14E6B; // Standard mode with Rise Time = 400ns and Fall Time = 100ns
Anna Bridge 160:5571c4ff569f 60 break;
Anna Bridge 160:5571c4ff569f 61 case 400000:
Anna Bridge 160:5571c4ff569f 62 tim = 0x10D1143A; // Fast mode with Rise Time = 250ns and Fall Time = 100ns
Anna Bridge 160:5571c4ff569f 63 break;
Anna Bridge 160:5571c4ff569f 64 case 1000000:
Anna Bridge 160:5571c4ff569f 65 tim = 0x00810E27; // Fast mode Plus with Rise Time = 60ns and Fall Time = 100ns
Anna Bridge 160:5571c4ff569f 66 break;
Anna Bridge 160:5571c4ff569f 67 default:
Anna Bridge 160:5571c4ff569f 68 break;
Anna Bridge 160:5571c4ff569f 69 }
Anna Bridge 160:5571c4ff569f 70 } else if (SystemCoreClock == 48000000) {
Anna Bridge 160:5571c4ff569f 71 // Common settings: I2C clock = 48 MHz, Analog filter = ON, Digital filter coefficient = 0
Anna Bridge 160:5571c4ff569f 72 switch (hz) {
Anna Bridge 160:5571c4ff569f 73 case 100000:
Anna Bridge 160:5571c4ff569f 74 tim = 0x20A03E55; // Standard mode with Rise Time = 400ns and Fall Time = 100ns
Anna Bridge 160:5571c4ff569f 75 break;
Anna Bridge 160:5571c4ff569f 76 case 400000:
Anna Bridge 160:5571c4ff569f 77 tim = 0x10800C21; // Fast mode with Rise Time = 250ns and Fall Time = 100ns
Anna Bridge 160:5571c4ff569f 78 break;
Anna Bridge 160:5571c4ff569f 79 case 1000000:
Anna Bridge 160:5571c4ff569f 80 tim = 0x00500816; // Fast mode Plus with Rise Time = 60ns and Fall Time = 100ns
Anna Bridge 160:5571c4ff569f 81 break;
Anna Bridge 160:5571c4ff569f 82 default:
Anna Bridge 160:5571c4ff569f 83 break;
Anna Bridge 160:5571c4ff569f 84 }
Anna Bridge 160:5571c4ff569f 85 }
Anna Bridge 160:5571c4ff569f 86 return tim;
Anna Bridge 160:5571c4ff569f 87 }
Anna Bridge 160:5571c4ff569f 88
Anna Bridge 160:5571c4ff569f 89 #ifdef __cplusplus
Anna Bridge 160:5571c4ff569f 90 }
Anna Bridge 160:5571c4ff569f 91 #endif
Anna Bridge 160:5571c4ff569f 92
Anna Bridge 160:5571c4ff569f 93 #endif // DEVICE_I2C
Anna Bridge 160:5571c4ff569f 94
Anna Bridge 160:5571c4ff569f 95 #endif