1 //*****************************************************************************
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3 // pdc.c - Driver for the Peripheral Device Controller (PDC) on the Stellaris
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4 // development board.
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6 // Copyright (c) 2005,2006 Luminary Micro, Inc. All rights reserved.
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8 // Software License Agreement
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10 // Luminary Micro, Inc. (LMI) is supplying this software for use solely and
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11 // exclusively on LMI's Stellaris Family of microcontroller products.
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13 // The software is owned by LMI and/or its suppliers, and is protected under
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14 // applicable copyright laws. All rights are reserved. Any use in violation
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15 // of the foregoing restrictions may subject the user to criminal sanctions
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16 // under applicable laws, as well as to civil liability for the breach of the
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17 // terms and conditions of this license.
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19 // THIS SOFTWARE IS PROVIDED "AS IS". NO WARRANTIES, WHETHER EXPRESS, IMPLIED
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20 // OR STATUTORY, INCLUDING, BUT NOT LIMITED TO, IMPLIED WARRANTIES OF
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21 // MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE APPLY TO THIS SOFTWARE.
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22 // LMI SHALL NOT, IN ANY CIRCUMSTANCES, BE LIABLE FOR SPECIAL, INCIDENTAL, OR
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23 // CONSEQUENTIAL DAMAGES, FOR ANY REASON WHATSOEVER.
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25 //*****************************************************************************
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27 #include "LM3Sxxx.h"
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30 //*****************************************************************************
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32 //! Initializes the connection to the PDC.
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34 //! This function will enable clocking to the SSI and GPIO A modules, configure
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35 //! the GPIO pins to be used for an SSI interface, and it will configure the
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36 //! SSI as a 1Mb master device, operating in MOTO mode. It will also enable
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37 //! the SSI module, and will enable the chip select for the PDC on the
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38 //! Stellaris development board.
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40 //! This function is contained in <tt>utils/pdc.c</tt>, with
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41 //! <tt>utils/pdc.h</tt> containing the API definition for use by applications.
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45 //*****************************************************************************
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50 // Enable the peripherals used to drive the PDC.
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52 SysCtlPeripheralEnable(SYSCTL_PERIPH_SSI);
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53 SysCtlPeripheralEnable(SYSCTL_PERIPH_GPIOA);
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56 // Configure the appropriate pins to be SSI instead of GPIO.
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58 GPIODirModeSet(GPIO_PORTA_BASE, SSI_CLK | SSI_TX | SSI_RX,
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60 GPIODirModeSet(GPIO_PORTA_BASE, SSI_CS, GPIO_DIR_MODE_OUT);
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61 GPIOPadConfigSet(GPIO_PORTA_BASE, SSI_CLK, GPIO_STRENGTH_4MA,
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62 GPIO_PIN_TYPE_STD_WPU);
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65 // Configure the SSI port.
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67 SSIConfig(SSI_BASE, SSI_FRF_MOTO_MODE_0, SSI_MODE_MASTER, 1000000, 8);
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68 SSIEnable(SSI_BASE);
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71 // Reset the PDC SSI state machine. The chip select needs to be held low
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72 // for 100ns; the procedure call overhead more than accounts for this time.
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74 GPIOPinWrite(GPIO_PORTA_BASE, PDC_CS, 0);
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75 GPIOPinWrite(GPIO_PORTA_BASE, PDC_CS, PDC_CS);
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78 //*****************************************************************************
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80 //! Write a PDC register.
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82 //! \param ucAddr specifies the PDC register to write.
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83 //! \param ucData specifies the data to write.
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85 //! This function will perform the SSI transfers required to write a register
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86 //! in the PDC on the Stellaris development board.
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88 //! This function is contained in <tt>utils/pdc.c</tt>, with
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89 //! <tt>utils/pdc.h</tt> containing the API definition for use by applications.
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93 //*****************************************************************************
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95 PDCWrite(unsigned char ucAddr, unsigned char ucData)
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97 unsigned long ulTemp;
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100 // Send address and write command.
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102 SSIDataPut(SSI_BASE, (ucAddr & 0x0F) | PDC_WR);
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107 SSIDataPut(SSI_BASE, ucData);
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110 // Flush data read during address write.
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112 SSIDataGet(SSI_BASE, &ulTemp);
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115 // Flush data read during data write.
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117 SSIDataGet(SSI_BASE, &ulTemp);
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