| 1 | /** |
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| 2 | * \file reset_sdc.c |
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| 3 | * \author Cesar Fuguet |
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| 4 | * \date July 23, 2014 |
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| 5 | * |
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| 6 | * \brief Wrapper for the SD card and SPI drivers |
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| 7 | */ |
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| 8 | #include <reset_sdc.h> |
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| 9 | #include <reset_tty.h> |
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| 10 | #include <reset_utils.h> |
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| 11 | #include <defs.h> |
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| 12 | #include <sdcard.h> |
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| 13 | #include <spi.h> |
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| 14 | |
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| 15 | #ifndef SEG_IOC_BASE |
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| 16 | # error "SEG_IOC_BASE constant must be defined in the hard_config.h file" |
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| 17 | #endif |
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| 18 | |
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| 19 | static struct sdcard_dev _sdcard_device; |
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| 20 | static struct spi_dev *const _spi_device = (struct spi_dev*)SEG_IOC_BASE; |
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| 21 | |
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| 22 | static const int sdcard_reset_retries = 4; |
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| 23 | static const int spi_init_clkfreq = 200000 ; /* Hz */ |
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| 24 | static const int spi_func_clkfreq = 10000000; /* Hz */ |
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| 25 | |
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| 26 | int reset_sdc_init() |
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| 27 | { |
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| 28 | unsigned char sdcard_rsp; |
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| 29 | |
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| 30 | reset_puts("Initializing block device\n\r"); |
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| 31 | |
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| 32 | /** |
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| 33 | * Initializing the SPI controller |
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| 34 | */ |
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| 35 | spi_dev_config ( |
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| 36 | _spi_device , |
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| 37 | spi_init_clkfreq , |
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| 38 | RESET_SYSTEM_CLK * 1000, |
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| 39 | 8 , |
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| 40 | SPI_TX_NEGEDGE , |
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| 41 | SPI_RX_POSEDGE |
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| 42 | ); |
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| 43 | |
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| 44 | /** |
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| 45 | * Initializing the SD Card |
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| 46 | */ |
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| 47 | unsigned int iter = 0; |
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| 48 | while(1) |
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| 49 | { |
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| 50 | reset_puts("Trying to initialize SD card... "); |
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| 51 | |
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| 52 | sdcard_rsp = sdcard_dev_open(&_sdcard_device, _spi_device, 0); |
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| 53 | if (sdcard_rsp == 0) |
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| 54 | { |
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| 55 | reset_puts("OK\n"); |
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| 56 | break; |
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| 57 | } |
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| 58 | |
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| 59 | reset_puts("KO\n"); |
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| 60 | reset_sleep(1000); |
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| 61 | if (++iter >= sdcard_reset_retries) |
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| 62 | { |
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| 63 | reset_puts("\nERROR: During SD card reset to IDLE state\n" |
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| 64 | "/ card response = "); |
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| 65 | reset_putx(sdcard_rsp); |
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| 66 | reset_puts("\n"); |
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| 67 | reset_exit(); |
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| 68 | } |
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| 69 | } |
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| 70 | |
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| 71 | /** |
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| 72 | * Set the block length of the SD Card |
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| 73 | */ |
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| 74 | sdcard_rsp = sdcard_dev_set_blocklen(&_sdcard_device, 512); |
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| 75 | if (sdcard_rsp) |
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| 76 | { |
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| 77 | reset_puts("ERROR: During SD card blocklen initialization\n"); |
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| 78 | reset_exit(); |
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| 79 | } |
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| 80 | |
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| 81 | /** |
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| 82 | * Incrementing SDCARD clock frequency for normal function |
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| 83 | */ |
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| 84 | spi_dev_config ( |
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| 85 | _spi_device , |
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| 86 | spi_func_clkfreq , |
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| 87 | RESET_SYSTEM_CLK * 1000, |
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| 88 | -1 , |
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| 89 | -1 , |
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| 90 | -1 |
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| 91 | ); |
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| 92 | |
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| 93 | reset_puts("Finish block device initialization\n\r"); |
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| 94 | |
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| 95 | return 0; |
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| 96 | } /* end reset_spi_init() */ |
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| 97 | |
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| 98 | int reset_sdc_read( unsigned int lba, void* buffer, unsigned int count ) |
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| 99 | { |
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| 100 | unsigned int sdcard_rsp; |
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| 101 | unsigned int i; |
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| 102 | |
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| 103 | sdcard_dev_lseek(&_sdcard_device, lba); |
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| 104 | for(i = 0; i < count; i++) |
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| 105 | { |
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| 106 | unsigned char* buf = (unsigned char *) buffer + (512 * i); |
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| 107 | if (( sdcard_rsp = sdcard_dev_read ( &_sdcard_device, buf, 512 ) )) |
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| 108 | { |
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| 109 | reset_puts("ERROR during read on the SDCARD device. Code: "); |
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| 110 | reset_putx(sdcard_rsp); |
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| 111 | reset_puts("\n"); |
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| 112 | return 1; |
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| 113 | } |
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| 114 | } |
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| 115 | return 0; |
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| 116 | } |
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| 117 | |
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| 118 | /* |
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| 119 | * vim: tabstop=4 : softtabstop=4 : shiftwidth=4 : expandtab |
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| 120 | */ |
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