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