3afc2b6c61
This code component is used to add Zephyr support on iMX7 processors,
exclusively on Cortex M4 core, and to speed up the development process
it was decided to have it based on NXP FreeRTOS BSP implementation.
The source code was imported from the following folders:
FreeRTOS_BSP_1.0.1_iMX7D/platform/drivers
FreeRTOS_BSP_1.0.1_iMX7D/platform/devices
This source code depends on headers and sources from zephyr:
ext/hal/cmsis
Origin: iMX7D NXP FreeRTOS BSP Peripheral Driver
License: BSD 3-Clause
URL: https://www.nxp.com/webapp/Download?colCode=FreeRTOS_iMX7D_1.0.1_LINUX&appType=license
commit: no commit hash
Purpose: The peripheral driver wraps the H/W for i.MX7 M4 core
Maintained-by: External
Signed-off-by: Diego Sueiro <diego.sueiro@gmail.com>
167 lines
6.7 KiB
C
167 lines
6.7 KiB
C
/*
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* Copyright (c) 2015, Freescale Semiconductor, Inc.
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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 modification,
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* are permitted provided that the following conditions are met:
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*
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* o Redistributions of source code must retain the above copyright notice, this list
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* of conditions and the following disclaimer.
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*
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* o Redistributions in binary form must reproduce the above copyright notice, this
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* list of conditions and the following disclaimer in the documentation and/or
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* other materials provided with the distribution.
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*
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* o Neither the name of Freescale Semiconductor, Inc. nor the names of its
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* contributors may be used to endorse or promote products derived from this
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* software 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" AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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* 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 FOR
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* ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
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* ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include "i2c_imx.h"
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/*******************************************************************************
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* Constant
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******************************************************************************/
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static const uint32_t i2cClkDivTab[][2] =
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{
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{22, 0x20}, {24, 0x21}, {26, 0x22}, {28, 0x23}, {30, 0x00}, {32, 0x24}, {36, 0x25}, {40, 0x26},
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{42, 0x03}, {44, 0x27}, {48, 0x28}, {52, 0x05}, {56, 0x29}, {60, 0x06}, {64, 0x2A}, {72, 0x2B},
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{80, 0x2C}, {88, 0x09}, {96, 0x2D}, {104, 0x0A}, {112, 0x2E}, {128, 0x2F}, {144, 0x0C}, {160, 0x30},
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{192, 0x31}, {224, 0x32}, {240, 0x0F}, {256, 0x33}, {288, 0x10}, {320, 0x34}, {384, 0x35}, {448, 0x36},
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{480, 0x13}, {512, 0x37}, {576, 0x14}, {640, 0x38}, {768, 0x39}, {896, 0x3A}, {960, 0x17}, {1024, 0x3B},
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{1152, 0x18}, {1280, 0x3C}, {1536, 0x3D}, {1792, 0x3E}, {1920, 0x1B}, {2048, 0x3F}, {2304, 0x1C}, {2560, 0x1D},
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{3072, 0x1E}, {3840, 0x1F}
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};
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/*******************************************************************************
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* Code
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******************************************************************************/
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/*******************************************************************************
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* I2C Initialization and Configuration functions
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******************************************************************************/
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/*FUNCTION**********************************************************************
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*
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* Function Name : I2C_Init
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* Description : Initialize I2C module with given initialize structure.
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*
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*END**************************************************************************/
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void I2C_Init(I2C_Type* base, const i2c_init_config_t* initConfig)
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{
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assert(initConfig);
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/* Disable I2C Module. */
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I2C_I2CR_REG(base) &= ~I2C_I2CR_IEN_MASK;
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/* Reset I2C register to its default value. */
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I2C_Deinit(base);
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/* Set I2C Module own Slave Address. */
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I2C_SetSlaveAddress(base, initConfig->slaveAddress);
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/* Set I2C BaudRate according to i2c initialize struct. */
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I2C_SetBaudRate(base, initConfig->clockRate, initConfig->baudRate);
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}
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/*FUNCTION**********************************************************************
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*
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* Function Name : I2C_Deinit
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* Description : This function reset I2C module register content to
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* its default value.
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*
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*END**************************************************************************/
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void I2C_Deinit(I2C_Type* base)
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{
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/* Disable I2C Module */
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I2C_I2CR_REG(base) &= ~I2C_I2CR_IEN_MASK;
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/* Reset I2C Module Register content to default value */
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I2C_IADR_REG(base) = 0x0;
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I2C_IFDR_REG(base) = 0x0;
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I2C_I2CR_REG(base) = 0x0;
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}
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/*FUNCTION**********************************************************************
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*
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* Function Name : I2C_SetBaudRate
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* Description : This function is used to set the baud rate of I2C Module.
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*
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*END**************************************************************************/
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void I2C_SetBaudRate(I2C_Type* base, uint32_t clockRate, uint32_t baudRate)
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{
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uint32_t clockDiv;
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uint8_t clkDivIndex = 0;
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assert(baudRate <= 400000);
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/* Calculate accurate baudRate divider. */
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clockDiv = clockRate / baudRate;
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if (clockDiv < i2cClkDivTab[0][0])
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{
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/* If clock divider is too small, using smallest legal divider */
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clkDivIndex = 0;
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}
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else if (clockDiv > i2cClkDivTab[sizeof(i2cClkDivTab)/sizeof(i2cClkDivTab[0]) - 1][0])
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{
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/* If clock divider is too large, using largest legal divider */
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clkDivIndex = sizeof(i2cClkDivTab)/sizeof(i2cClkDivTab[0]) - 1;
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}
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else
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{
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while (i2cClkDivTab[clkDivIndex][0] < clockDiv)
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clkDivIndex++;
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}
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I2C_IFDR_REG(base) = i2cClkDivTab[clkDivIndex][1];
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}
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/*******************************************************************************
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* I2C Bus Control functions
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******************************************************************************/
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/*FUNCTION**********************************************************************
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*
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* Function Name : I2C_SetAckBit
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* Description : This function is used to set the Transmit Acknowledge
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* action when receive data from other device.
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*
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*END**************************************************************************/
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void I2C_SetAckBit(I2C_Type* base, bool ack)
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{
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if (ack)
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I2C_I2CR_REG(base) &= ~I2C_I2CR_TXAK_MASK;
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else
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I2C_I2CR_REG(base) |= I2C_I2CR_TXAK_MASK;
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}
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/*******************************************************************************
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* Interrupts and flags management functions
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******************************************************************************/
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/*FUNCTION**********************************************************************
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*
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* Function Name : I2C_SetIntCmd
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* Description : Enables or disables I2C interrupt requests.
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*
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*END**************************************************************************/
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void I2C_SetIntCmd(I2C_Type* base, bool enable)
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{
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if (enable)
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I2C_I2CR_REG(base) |= I2C_I2CR_IIEN_MASK;
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else
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I2C_I2CR_REG(base) &= ~I2C_I2CR_IIEN_MASK;
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}
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/*******************************************************************************
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* EOF
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******************************************************************************/
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