author | Lukasz Forynski <lukasz.forynski@gmail.com> |
Tue, 21 Sep 2010 02:30:11 +0100 | |
branch | Beagle_BSP_dev |
changeset 77 | e5fd00cbb70a |
child 82 | 65b40f262685 |
permissions | -rw-r--r-- |
77
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// This component and the accompanying materials are made available |
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// under the terms of the License "Eclipse Public License v1.0" |
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3 |
// which accompanies this distribution, and is available |
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// at the URL "http://www.eclipse.org/legal/epl-v10.html". |
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5 |
// |
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// Initial Contributors: |
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7 |
// lukasz.forynski@gmail.com |
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8 |
// |
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9 |
// Contributors: |
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10 |
// |
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// Description: |
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// omap3530/omap3530_drivers/spi/omap3530_spi.inl |
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13 |
// |
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14 |
// This file contains definitions to internal SPI implementation. |
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15 |
// It is not intended to be exported - SPI registers must not be modified from outside of |
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// the driver! |
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// |
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18 |
|
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|
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// This sets the CS line to inactive mode (Specify aActiveMode as appropriate for configuration) |
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// The CS pin will be put back to the opposite mode - using GPIO.. |
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inline void SetCsInactive(TInt aModule, TInt aChannel, TSpiSsPinMode aActiveMode) |
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{ |
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//__ASSERT_DEBUG(aModule < KMaxSpiChannelsPerModule, Kern::Fault("omap3530_spi.inl, line: ", __LINE__)); // aChannel > module channels |
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// set the pin to the opposite to the currently active CS mode.. |
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TUint16 csPinOptions = aActiveMode == ESpiCSPinActiveLow ? KCsPinModeUp : KCsPinModeDown; |
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const TPinConfig& csConf = ModulePinConfig[aModule].iCs[aChannel]; |
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__ASSERT_DEBUG(csConf.iAddress, Kern::Fault("omap3530_spi.inl, line: ", __LINE__)); // aChannel > module channels |
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|
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// now switch the pin mode.. |
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SCM::SetPadConfig(csConf.iAddress, csConf.iMswLsw, SCM::EMode4 | csPinOptions); // always go to mode 4 (gpio) |
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} |
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|
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void SetCsActive(TInt aModule, TInt aChannel, TSpiSsPinMode aActiveMode) |
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35 |
{ |
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//__ASSERT_DEBUG(aModule < KMaxSpiChannelsPerModule, Kern::Fault("omap3530_spi.inl, line: ", __LINE__)); // aChannel > module channels |
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TUint16 csPinOptions = aActiveMode == ESpiCSPinActiveLow ? KCsPinModeUp : KCsPinModeDown; |
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const TPinConfig &csConf = ModulePinConfig[aModule].iCs[aChannel]; |
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39 |
__ASSERT_DEBUG(csConf.iAddress, Kern::Fault("omap3530_spi.inl, line: ", __LINE__)); // aChannel > module channels |
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40 |
|
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41 |
// now switch the pin mode back to the SPI |
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42 |
SCM::SetPadConfig(csConf.iAddress, csConf.iMswLsw, csConf.iFlags | csPinOptions); // revert to intended mode |
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43 |
} |
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|
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45 |
|
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46 |
// Setup pad function for SPI pins.. |
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void SetupSpiPins(TUint aSpiModule) |
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48 |
{ |
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49 |
//__ASSERT_DEBUG(aModule < KMaxSpiChannelsPerModule, Kern::Fault("omap3530_spi.inl, line: ", __LINE__)); // aChannel > module channels |
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const TSpiPinConfig& pinCnf = ModulePinConfig[aSpiModule]; |
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SCM::SetPadConfig(pinCnf.iClk.iAddress, pinCnf.iClk.iMswLsw, pinCnf.iClk.iFlags); |
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52 |
SCM::SetPadConfig(pinCnf.iSimo.iAddress, pinCnf.iSimo.iMswLsw, pinCnf.iSimo.iFlags); |
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SCM::SetPadConfig(pinCnf.iSomi.iAddress, pinCnf.iSomi.iMswLsw, pinCnf.iSomi.iFlags); |
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54 |
// Cs pins are set dynamically during operations. |
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55 |
} |
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56 |
|
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57 |
// helper function - returns appropriate value for the register for a given mode |
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58 |
inline TUint32 SpiClkMode(TSpiClkMode aClkMode) |
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59 |
{ |
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// (POL) (PHA) |
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// 0 0 Mode 0: spim_clk is active high and sampling occurs on the rising edge. |
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// 0 1 Mode 1: spim_clk is active high and sampling occurs on the falling edge. |
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// 1 0 Mode 2: spim_clk is active low and sampling occurs on the falling edge. |
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// 1 1 Mode 3: spim_clk is active low and sampling occurs on the rising edge. |
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65 |
|
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66 |
TUint val = 0; |
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67 |
switch(aClkMode) |
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68 |
{ |
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//case ESpiPolarityLowRisingEdge: // Active high, odd edges |
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70 |
/*val |= MCSPI_CHxCONF_POL;*/ // 0 (not set) |
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71 |
/*val |= MCSPI_CHxCONF_PHA;*/ // 0 (not set) |
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72 |
//break; // commented out - it's only for reference - there's nothing to change |
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73 |
|
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case ESpiPolarityLowFallingEdge: // Active high, even edges |
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75 |
/*val |= MCSPI_CHxCONF_POL;*/ // 0 (not set) |
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76 |
val |= MCSPI_CHxCONF_PHA; // 1 |
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77 |
break; |
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78 |
|
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79 |
case ESpiPolarityHighFallingEdge: // Active low, odd edges |
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80 |
val |= MCSPI_CHxCONF_POL; // 1 |
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81 |
/*val |= MCSPI_CHxCONF_PHA;*/ // 0 (not set) |
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82 |
break; |
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83 |
|
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84 |
case ESpiPolarityHighRisingEdge: // Active low, even edges |
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85 |
val |= MCSPI_CHxCONF_POL; // 1 |
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86 |
val |= MCSPI_CHxCONF_PHA; // 1 |
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87 |
break; |
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88 |
} |
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89 |
return val; |
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90 |
} |
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91 |
|
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92 |
// helper function - returns appropriate value for the register for a given frequency (or error->if not found) |
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93 |
inline TInt SpiClkValue(TInt aClkSpeedHz) |
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94 |
{ |
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for (TInt val = 0; val < 0xD; val++) // only loop through all possible values.. |
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96 |
{ |
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97 |
if(MCSPI_K48MHz >> val == aClkSpeedHz) |
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98 |
{ |
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99 |
return (val << 2); // return value ready for the register |
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100 |
} |
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101 |
} |
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102 |
return KErrNotFound; |
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parents:
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103 |
} |
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|
104 |
|
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105 |
inline TInt SpiWordWidth(TSpiWordWidth aWidth) |
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parents:
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|
106 |
{ |
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parents:
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107 |
TInt val = 0; |
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parents:
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108 |
switch(aWidth) |
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109 |
{ |
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110 |
case ESpiWordWidth_8: val |= MCSPI_CHxCONF_WL(8); break; |
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|
111 |
case ESpiWordWidth_10: val |= MCSPI_CHxCONF_WL(10); break; |
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parents:
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|
112 |
case ESpiWordWidth_12: val |= MCSPI_CHxCONF_WL(12); break; |
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113 |
case ESpiWordWidth_16: val |= MCSPI_CHxCONF_WL(16); break; |
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114 |
// case ESpiWordWidth_32: val |= MCSPI_CHxCONF_WL(32); break; // TODO uncomment when fix for Bug 3665 is released |
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parents:
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115 |
} |
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116 |
return val; |
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117 |
} |
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|
118 |