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| Rev | Author | Line No. | Line |
|---|---|---|---|
| 231 | killagreg | 1 | #include <avr/io.h> |
| 2 | #include "fat16.h" |
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| 3 | #include "ssc.h" |
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| 4 | |||
| 5 | //________________________________________________________________________________________________________________________________________ |
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| 6 | // Module name: fat16.c |
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| 7 | // Compiler used: avr-gcc 3.4.5 |
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| 8 | // Last Modifikation: 24.07.2007 |
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| 9 | // Version: 1.03 |
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| 10 | // Authors: Stephan Busker |
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| 11 | // Description: Source files for access to the synchrnous serial channel. |
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| 12 | // Copyright (C) 2007 Stephan Busker |
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| 13 | //........................................................................................................................................ |
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| 14 | // Functions: extern void SSC_Init(void); |
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| 15 | // extern u8 SSC_GetChar (void); |
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| 16 | // extern void SSC_PutChar (u8 Byte); |
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| 17 | // extern void SSC_Disable(void); |
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| 18 | // extern void SSC_Enable(void); |
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| 19 | //........................................................................................................................................ |
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| 20 | // ext. functions: extern u8 SDC_GetSector (u32,u8*); |
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| 21 | // extern u8 SDC_PutSector (u32,u8*); |
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| 22 | //........................................................................................................................................ |
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| 23 | // |
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| 24 | // URL: www.Mikro-Control.de |
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| 25 | // mailto: stephan.busker@mikro-control.de |
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| 26 | //________________________________________________________________________________________________________________________________________ |
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| 27 | |||
| 28 | |||
| 29 | |||
| 30 | |||
| 31 | //________________________________________________________________________________________________________________________________________ |
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| 32 | // Funtion: SSC_Init(void); |
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| 33 | // |
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| 34 | // Description: This function initialises the synchronus serial channel to the sdcard. |
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| 35 | // |
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| 36 | // |
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| 37 | // Returnvalue: none |
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| 38 | //________________________________________________________________________________________________________________________________________ |
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| 39 | |||
| 40 | void SSC_Init(void) |
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| 41 | { |
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| 42 | MMC_Direction_REG &=~(1<<SPI_DI); // Set the direction of the ssc-port |
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| 43 | MMC_Direction_REG |= (1<<SPI_Clock); // _______ _______ |
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| 44 | MMC_Direction_REG |= (1<<SPI_DO); // CS \________________________/ |
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| 45 | MMC_Direction_REG |= (1<<MMC_Chip_Select); // |
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| 46 | MMC_Direction_REG |= (1<<SPI_SS); // ___ ___ ___ |
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| 47 | // clk __________/ \___/ \___/ \_________ |
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| 48 | // |
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| 49 | SSC_Disable(); // ___ ___ |
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| 50 | // data_________/ \___________/ \___________ |
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| 51 | |||
| 52 | // initialise ssc, clock = Idel low |
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| 53 | // devide clock by 32 |
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| 54 | SPCR = (1<<SPE)|(1<<MSTR)|(1<<SPR1)|(1<<CPOL); // Enable SSC in mastermode, invert clockpolarity (idle high) |
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| 55 | SPSR = SPSR|(1<<SPI2X); |
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| 56 | } |
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| 57 | |||
| 58 | |||
| 59 | |||
| 60 | |||
| 61 | //________________________________________________________________________________________________________________________________________ |
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| 62 | // Funtion: void SSC_ClearRxFifo(void); |
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| 63 | // |
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| 64 | // Description: Clears the fifo of the ssc if the controller used has a builtin fifo. |
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| 65 | // |
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| 66 | // |
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| 67 | // Returnvalue: none |
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| 68 | //________________________________________________________________________________________________________________________________________ |
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| 69 | |||
| 70 | |||
| 71 | void SSC_ClearRxFifo(void) |
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| 72 | { |
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| 73 | // enter your code here to clear the rx-fifo of the ssc. |
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| 74 | } |
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| 75 | |||
| 76 | |||
| 77 | |||
| 78 | //________________________________________________________________________________________________________________________________________ |
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| 79 | // Funtion: SSC_GetChar(void); |
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| 80 | // |
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| 81 | // Description: This function reads one byte from the SSC |
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| 82 | // |
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| 83 | // |
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| 84 | // Returnvalue: the byte received. |
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| 85 | //________________________________________________________________________________________________________________________________________ |
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| 86 | |||
| 87 | u8 SSC_GetChar (void) |
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| 88 | { |
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| 89 | u8 Byte = 0; |
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| 90 | |||
| 91 | SPDR = 0x00; // read one byte of data from the SSC |
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| 92 | while(!(SPSR & (1<<SPIF))){}; // wait until the data has been read. |
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| 93 | Byte = SPDR; |
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| 94 | |||
| 95 | #ifdef __MMC_INTERFACE_INVERTED |
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| 96 | return (~Byte); |
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| 97 | #else |
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| 98 | return (Byte); // the byte received |
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| 99 | #endif |
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| 100 | |||
| 101 | |||
| 102 | } |
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| 103 | |||
| 104 | |||
| 105 | //________________________________________________________________________________________________________________________________________ |
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| 106 | // Funtion: SSC_PutChar(u8 Byte); |
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| 107 | // |
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| 108 | // Description: This function writes one byte to the SSC |
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| 109 | // |
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| 110 | // |
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| 111 | // Returnvalue: none |
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| 112 | //________________________________________________________________________________________________________________________________________ |
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| 113 | |||
| 114 | void SSC_PutChar (u8 Byte) |
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| 115 | { |
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| 116 | #ifdef __MMC_INTERFACE_INVERTED |
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| 117 | SPDR = ~Byte; // send one byte of data to the SSC |
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| 118 | #else |
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| 119 | SPDR = Byte; // send one byte of data to the SSC |
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| 120 | #endif |
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| 121 | SPDR = ~Byte; // send one byte of data to the SSC |
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| 122 | while(!(SPSR & (1<<SPIF))) // wait until data was send. |
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| 123 | { |
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| 124 | } |
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| 125 | } |
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| 126 | |||
| 127 | |||
| 128 | //________________________________________________________________________________________________________________________________________ |
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| 129 | // Funtion: SSC_Disable(void); |
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| 130 | // |
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| 131 | // Description: This function enables chipselect of the sdcard (active low) |
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| 132 | // |
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| 133 | // |
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| 134 | // Returnvalue: none |
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| 135 | //________________________________________________________________________________________________________________________________________ |
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| 136 | |||
| 137 | void SSC_Disable(void) |
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| 138 | { |
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| 139 | #ifdef __MMC_INTERFACE_INVERTED |
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| 140 | MMC_Write &= ~(1<<MMC_Chip_Select); // disable chipselect of the sdcard (active low). |
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| 141 | #else |
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| 142 | MMC_Write |= (1<<MMC_Chip_Select); // enable chipselect of the sdcard (active low). |
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| 143 | #endif |
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| 144 | } |
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| 145 | |||
| 146 | |||
| 147 | |||
| 148 | |||
| 149 | //________________________________________________________________________________________________________________________________________ |
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| 150 | // Funtion: SSC_Enable(void); |
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| 151 | // |
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| 152 | // Description: This function disables chipselect of the sdcard (active low) |
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| 153 | // |
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| 154 | // |
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| 155 | // Returnvalue: none |
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| 156 | //________________________________________________________________________________________________________________________________________ |
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| 157 | |||
| 158 | void SSC_Enable(void) |
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| 159 | { |
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| 160 | #ifdef __MMC_INTERFACE_INVERTED |
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| 161 | MMC_Write |= (1<<MMC_Chip_Select); // enable chipselect of the sdcard (active low). |
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| 162 | #else |
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| 163 | MMC_Write &= ~(1<<MMC_Chip_Select); // disable chipselect of the sdcard (active low). |
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| 164 | #endif |
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| 165 | } |
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| 166 |