272 lines
7.1 KiB
C
272 lines
7.1 KiB
C
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//###########################################################################
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//
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// FILE: i2c.c
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//
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// TITLE: C28x I2C driver.
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//
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//###########################################################################
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// $Copyright:
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// Copyright (C) 2022 Texas Instruments Incorporated - http://www.ti.com
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//
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// Redistribution and use in source and binary forms, with or without
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// modification, are permitted provided that the following conditions
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// are met:
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//
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// Redistributions of source code must retain the above copyright
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// notice, this list of conditions and the following disclaimer.
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//
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// Redistributions in binary form must reproduce the above copyright
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// notice, this list of conditions and the following disclaimer in the
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// documentation and/or other materials provided with the
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// distribution.
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//
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// Neither the name of Texas Instruments Incorporated nor the names of
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// its contributors may be used to endorse or promote products derived
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// from this software without specific prior written permission.
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//
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// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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// 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
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// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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// $
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//###########################################################################
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#include <stdbool.h>
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#include <stdint.h>
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#include "i2c.h"
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//*****************************************************************************
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//
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// I2C_initController
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//
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//*****************************************************************************
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void
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I2C_initController(uint32_t base, uint32_t sysclkHz, uint32_t bitRate,
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I2C_DutyCycle dutyCycle)
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{
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uint32_t modPrescale;
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uint32_t divider;
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uint32_t dValue;
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//
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// Check the arguments.
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//
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ASSERT(I2C_isBaseValid(base));
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ASSERT((10000000U / bitRate) > 10U);
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//
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// Set the prescaler for the module clock.
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//
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modPrescale = (sysclkHz / 10000000U) - 1U;
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HWREGH(base + I2C_O_PSC) = I2C_PSC_IPSC_M & modPrescale;
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switch(modPrescale)
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{
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case 0U:
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dValue = 7U;
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break;
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case 1U:
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dValue = 6U;
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break;
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default:
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dValue = 5U;
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break;
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}
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//
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// Set the divider for the time low
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//
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divider = (10000000U / bitRate) - (2U * dValue);
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if(dutyCycle == I2C_DUTYCYCLE_50)
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{
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HWREGH(base + I2C_O_CLKH) = divider / 2U;
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}
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else
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{
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HWREGH(base + I2C_O_CLKH) = divider / 3U;
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}
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HWREGH(base + I2C_O_CLKL) = divider - HWREGH(base + I2C_O_CLKH);
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}
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//*****************************************************************************
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//
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// I2C_enableInterrupt
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//
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//*****************************************************************************
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void
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I2C_enableInterrupt(uint32_t base, uint32_t intFlags)
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{
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//
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// Check the arguments.
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//
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ASSERT(I2C_isBaseValid(base));
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//
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// Enable the desired basic interrupts
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//
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HWREGH(base + I2C_O_IER) |= (intFlags & 0x00FFU);
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//
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// Enabling addressed-as-target interrupt separately because its bit is
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// different between the IER and STR registers.
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//
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if((intFlags & I2C_INT_ADDR_TARGET) != 0U)
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{
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HWREGH(base + I2C_O_IER) |= I2C_IER_AAT;
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}
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//
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// Enable desired FIFO interrupts.
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//
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if((intFlags & I2C_INT_TXFF) != 0U)
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{
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HWREGH(base + I2C_O_FFTX) |= I2C_FFTX_TXFFIENA;
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}
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if((intFlags & I2C_INT_RXFF) != 0U)
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{
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HWREGH(base + I2C_O_FFRX) |= I2C_FFRX_RXFFIENA;
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}
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}
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//*****************************************************************************
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//
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// I2C_disableInterrupt
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//
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//*****************************************************************************
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void
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I2C_disableInterrupt(uint32_t base, uint32_t intFlags)
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{
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//
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// Check the arguments.
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//
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ASSERT(I2C_isBaseValid(base));
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//
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// Disable the desired basic interrupts.
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//
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HWREGH(base + I2C_O_IER) &= ~(intFlags & 0x00FFU);
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//
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// Disabling addressed-as-target interrupt separately because its bit is
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// different between the IER and STR registers.
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//
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if((intFlags & I2C_INT_ADDR_TARGET) != 0U)
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{
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HWREGH(base + I2C_O_IER) &= ~I2C_IER_AAT;
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}
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//
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// Disable the desired FIFO interrupts.
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//
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if((intFlags & I2C_INT_TXFF) != 0U)
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{
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HWREGH(base + I2C_O_FFTX) &= ~(I2C_FFTX_TXFFIENA);
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}
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if((intFlags & I2C_INT_RXFF) != 0U)
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{
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HWREGH(base + I2C_O_FFRX) &= ~(I2C_FFRX_RXFFIENA);
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}
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}
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//*****************************************************************************
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//
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// I2C_getInterruptStatus
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//
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//*****************************************************************************
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uint32_t
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I2C_getInterruptStatus(uint32_t base)
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{
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uint32_t temp;
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//
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// Check the arguments.
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//
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ASSERT(I2C_isBaseValid(base));
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//
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// Return only the status bits associated with interrupts.
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//
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temp = (uint32_t)(HWREGH(base + I2C_O_STR) & I2C_STR_INTMASK);
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//
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// Read FIFO interrupt flags.
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//
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if((HWREGH(base + I2C_O_FFTX) & I2C_FFTX_TXFFINT) != 0U)
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{
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temp |= I2C_INT_TXFF;
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}
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if((HWREGH(base + I2C_O_FFRX) & I2C_FFRX_RXFFINT) != 0U)
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{
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temp |= I2C_INT_RXFF;
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}
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return(temp);
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}
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//*****************************************************************************
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//
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// I2C_clearInterruptStatus
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//
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//*****************************************************************************
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void
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I2C_clearInterruptStatus(uint32_t base, uint32_t intFlags)
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{
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//
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// Check the arguments.
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//
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ASSERT(I2C_isBaseValid(base));
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//
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// Clear the interrupt flags that are located in STR.
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//
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HWREGH(base + I2C_O_STR) = ((uint16_t)intFlags & I2C_STR_INTMASK);
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//
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// Clear the FIFO interrupt flags if needed.
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//
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if((intFlags & I2C_INT_TXFF) != 0U)
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{
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HWREGH(base + I2C_O_FFTX) |= I2C_FFTX_TXFFINTCLR;
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}
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if((intFlags & I2C_INT_RXFF) != 0U)
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{
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HWREGH(base + I2C_O_FFRX) |= I2C_FFRX_RXFFINTCLR;
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}
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}
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//*****************************************************************************
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//
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// I2C_configureModuleFrequency
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//
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//*****************************************************************************
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void
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I2C_configureModuleFrequency(uint32_t base, uint32_t sysclkHz)
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{
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uint32_t modPrescale;
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//
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// Check the arguments.
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//
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ASSERT(I2C_isBaseValid(base));
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//
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// Set the prescaler for the module clock.
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//
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modPrescale = (sysclkHz / 10000000U) - 1U;
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HWREGH(base + I2C_O_PSC) = I2C_PSC_IPSC_M & modPrescale;
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}
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