diff options
Diffstat (limited to 'platform/drivers/src/i2c_imx.c')
| -rw-r--r-- | platform/drivers/src/i2c_imx.c | 167 |
1 files changed, 167 insertions, 0 deletions
diff --git a/platform/drivers/src/i2c_imx.c b/platform/drivers/src/i2c_imx.c new file mode 100644 index 0000000..9475c15 --- /dev/null +++ b/platform/drivers/src/i2c_imx.c @@ -0,0 +1,167 @@ +/* + * Copyright (c) 2015, Freescale Semiconductor, Inc. + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without modification, + * are permitted provided that the following conditions are met: + * + * o Redistributions of source code must retain the above copyright notice, this list + * of conditions and the following disclaimer. + * + * o 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. + * + * o Neither the name of Freescale Semiconductor, Inc. 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. + */ + +#include "i2c_imx.h" + +/******************************************************************************* + * Constant + ******************************************************************************/ +static const uint32_t i2cClkDivTab[][2] = +{ + {22, 0x20}, {24, 0x21}, {26, 0x22}, {28, 0x23}, {30, 0x00}, {32, 0x24}, {36, 0x25}, {40, 0x26}, + {42, 0x03}, {44, 0x27}, {48, 0x28}, {52, 0x05}, {56, 0x29}, {60, 0x06}, {64, 0x2A}, {72, 0x2B}, + {80, 0x2C}, {88, 0x09}, {96, 0x2D}, {104, 0x0A}, {112, 0x2E}, {128, 0x2F}, {144, 0x0C}, {160, 0x30}, + {192, 0x31}, {224, 0x32}, {240, 0x0F}, {256, 0x33}, {288, 0x10}, {320, 0x34}, {384, 0x35}, {448, 0x36}, + {480, 0x13}, {512, 0x37}, {576, 0x14}, {640, 0x38}, {768, 0x39}, {896, 0x3A}, {960, 0x17}, {1024, 0x3B}, + {1152, 0x18}, {1280, 0x3C}, {1536, 0x3D}, {1792, 0x3E}, {1920, 0x1B}, {2048, 0x3F}, {2304, 0x1C}, {2560, 0x1D}, + {3072, 0x1E}, {3840, 0x1F} +}; + +/******************************************************************************* + * Code + ******************************************************************************/ + +/******************************************************************************* + * I2C Initialization and Configuration functions + ******************************************************************************/ +/*FUNCTION********************************************************************** + * + * Function Name : I2C_Init + * Description : Initialize I2C module with given initialize structure. + * + *END**************************************************************************/ +void I2C_Init(I2C_Type* base, i2c_init_config_t* initConfig) +{ + assert(initConfig); + + /* Disable I2C Module. */ + I2C_I2CR_REG(base) &= ~I2C_I2CR_IEN_MASK; + + /* Reset I2C register to its default value. */ + I2C_Deinit(base); + + /* Set I2C Module own Slave Address. */ + I2C_SetSlaveAddress(base, initConfig->slaveAddress); + + /* Set I2C BaudRate according to i2c initialize struct. */ + I2C_SetBaudRate(base, initConfig->clockRate, initConfig->baudRate); +} + +/*FUNCTION********************************************************************** + * + * Function Name : I2C_Deinit + * Description : This function reset I2C module register content to + * its default value. + * + *END**************************************************************************/ +void I2C_Deinit(I2C_Type* base) +{ + /* Disable I2C Module */ + I2C_I2CR_REG(base) &= ~I2C_I2CR_IEN_MASK; + + /* Reset I2C Module Register content to default value */ + I2C_IADR_REG(base) = 0x0; + I2C_IFDR_REG(base) = 0x0; + I2C_I2CR_REG(base) = 0x0; +} + +/*FUNCTION********************************************************************** + * + * Function Name : I2C_SetBaudRate + * Description : This function is used to set the baud rate of I2C Module. + * + *END**************************************************************************/ +void I2C_SetBaudRate(I2C_Type* base, uint32_t clockRate, uint32_t baudRate) +{ + uint32_t clockDiv; + uint8_t clkDivIndex = 0; + + assert(baudRate <= 400000); + + /* Calculate accurate baudRate divider. */ + clockDiv = clockRate / baudRate; + + if (clockDiv < i2cClkDivTab[0][0]) + { + /* If clock divider is too small, using smallest legal divider */ + clkDivIndex = 0; + } + else if (clockDiv > i2cClkDivTab[sizeof(i2cClkDivTab)/sizeof(i2cClkDivTab[0]) - 1][0]) + { + /* If clock divider is too large, using largest legal divider */ + clkDivIndex = sizeof(i2cClkDivTab)/sizeof(i2cClkDivTab[0]) - 1; + } + else + { + while (i2cClkDivTab[clkDivIndex][0] < clockDiv) + clkDivIndex++; + } + + I2C_IFDR_REG(base) = i2cClkDivTab[clkDivIndex][1]; +} + +/******************************************************************************* + * I2C Bus Control functions + ******************************************************************************/ +/*FUNCTION********************************************************************** + * + * Function Name : I2C_SetAckBit + * Description : This function is used to set the Transmit Acknowledge + * action when receive data from other device. + * + *END**************************************************************************/ +void I2C_SetAckBit(I2C_Type* base, bool ack) +{ + if (ack) + I2C_I2CR_REG(base) &= ~I2C_I2CR_TXAK_MASK; + else + I2C_I2CR_REG(base) |= I2C_I2CR_TXAK_MASK; +} + +/******************************************************************************* + * Interrupts and flags management functions + ******************************************************************************/ +/*FUNCTION********************************************************************** + * + * Function Name : I2C_SetIntCmd + * Description : Enables or disables I2C interrupt requests. + * + *END**************************************************************************/ +void I2C_SetIntCmd(I2C_Type* base, bool enable) +{ + if (enable) + I2C_I2CR_REG(base) |= I2C_I2CR_IIEN_MASK; + else + I2C_I2CR_REG(base) &= ~I2C_I2CR_IIEN_MASK; +} + +/******************************************************************************* + * EOF + ******************************************************************************/ |