Project

General

Profile

Revision 242

Added by Diogo Miguel Ferreira Rodrigues almost 5 years ago

working on uart. done with first and second test functions

View differences:

uart.c
39 39 
#define UART_GET_DLL(n)           ((n)&0xFF)
40 40 
#define UART_GET_DLM(n)           (((n)>>8)&0xFF)
41 41 

  		




  
  42
  
    
#define UART_RECEIVED_DATA_POS      0


  		




  
  43
  
    
#define UART_TRANSMITTER_EMPTY_POS  1


  		




  
  44
  
    
#define UART_RECEIVER_LINE_STAT_POS 2


  		




  
  45
  
    
#define UART_MODEM_STAT_POS         3


  		




  
  46
  
    

  		




  
  47
  
    
#define UART_RECEIVED_DATA          (BIT(0))


  		




  
  48
  
    
#define UART_TRANSMITTER_EMPTY      (BIT(1))


  		




  
  49
  
    
#define UART_RECEIVER_LINE_STAT     (BIT(2))


  		




  
  50
  
    
#define UART_MODEM_STAT             (BIT(3))


  		




  
  51
  
    

  		




  
  52
  
    
#define UART_GET_RECEIVED_DATA(n)       (((n)&UART_RECEIVED_DATA     )>>UART_RECEIVED_DATA_POS     )


  		




  
  53
  
    
#define UART_GET_TRANSMITTER_EMPTY(n)   (((n)&UART_TRANSMITTER_EMPTY )>>UART_TRANSMITTER_EMPTY_POS )


  		




  
  54
  
    
#define UART_GET_RECEIVER_LINE_STAT(n)  (((n)&UART_RECEIVER_LINE_STAT)>>UART_RECEIVER_LINE_STAT_POS)


  		




  
  55
  
    
#define UART_GET_MODEM_STAT(n)          (((n)&UART_MODEM_STAT        )>>UART_MODEM_STAT_POS        )


  		




  
  56
  
    

  		




  42
  57
  
    
int uart_get_config(int base_addr, uart_config *config){


  		




  43
  58
  
    
    int ret = SUCCESS;


  		




  44
  59
  
    

  		




  45
  60
  
    
    config->base_addr = base_addr;


  		




  46
  61
  
    

  		




  47
  
  
    
    if((ret = util_sys_inb(base_addr+UART_LCR, &config->config))) return ret;


  		




  
  62
  
    
    if((ret = util_sys_inb(base_addr+UART_LCR, &config->lcr))) return ret;


  		




  48
  63
  
    

  		




  49
  
  
    
    if((ret = uart_enable_divisor_latch(base_addr))) return ret;


  		




  
  64
  
    
    if((ret = util_sys_inb(base_addr+UART_IER, &config->ier))) return ret;


  		




  
  65
  
    

  		




  
  66
  
    
    if((ret = uart_enable_divisor_latch (base_addr))) return ret;


  		




  50
  67
  
    
    if((ret = util_sys_inb(base_addr+UART_DLL, &config->dll   ))) return ret;


  		




  51
  68
  
    
    if((ret = util_sys_inb(base_addr+UART_DLM, &config->dlm   ))) return ret;


  		




  
  69
  
    
    if((ret = uart_disable_divisor_latch(base_addr))) return ret;


  		




  52
  70
  
    

  		




  53
  71
  
    
    uart_parse_config(config);


  		




  54
  72
  
    
    return ret;


  		




  55
  73
  
    
}


  		




  56
  74
  
    
void uart_parse_config(uart_config *config){


  		




  57
  
  
    
    config->bits_per_char        = UART_GET_BITS_PER_CHAR(config->config);


  		




  58
  
  
    
    config->stop_bits            = UART_GET_STOP_BITS    (config->config);


  		




  59
  
  
    
    config->parity               = UART_GET_PARITY       (config->config);


  		




  60
  
  
    
    config->break_control        = UART_GET_BREAK_CONTROL(config->config);


  		




  61
  
  
    
    config->dlab                 = UART_GET_DLAB         (config->config);


  		




  62
  
  
    
    config->divisor_latch        = UART_GET_DIV_LATCH    (config->dlm, config->dll);


  		




  
  75
  
    
    /// LCR


  		




  
  76
  
    
    config->bits_per_char          = UART_GET_BITS_PER_CHAR     (config->lcr);


  		




  
  77
  
    
    config->stop_bits              = UART_GET_STOP_BITS         (config->lcr);


  		




  
  78
  
    
    config->parity                 = UART_GET_PARITY            (config->lcr);


  		




  
  79
  
    
    config->break_control          = UART_GET_BREAK_CONTROL     (config->lcr);


  		




  
  80
  
    
    config->dlab                   = UART_GET_DLAB              (config->lcr);


  		




  
  81
  
    
    /// IER


  		




  
  82
  
    
    config->received_data_int      = UART_GET_RECEIVED_DATA     (config->ier);


  		




  
  83
  
    
    config->transmitter_empty_int  = UART_GET_TRANSMITTER_EMPTY (config->ier);


  		




  
  84
  
    
    config->receiver_line_stat_int = UART_GET_RECEIVER_LINE_STAT(config->ier);


  		




  
  85
  
    
    config->modem_stat_int         = UART_GET_MODEM_STAT        (config->ier);


  		




  
  86
  
    
    /// DIV LATCH


  		




  
  87
  
    
    config->divisor_latch          = UART_GET_DIV_LATCH(config->dlm, config->dll);


  		




  63
  88
  
    
}


  		




  64
  89
  
    
void uart_print_config(uart_config config){


  		




  65
  
  
    
    printf("Base address: 0x%X\n", config.base_addr);


  		




  66
  
  
    
    printf("Configuration: 0x%02X\n", config.config);


  		




  67
  
  
    
    printf("Number of bits per char: %d\n", config.bits_per_char);


  		




  68
  
  
    
    printf("Number of stop bits: %d\n", config.stop_bits);


  		




  69
  
  
    
    printf("Parity: ");


  		




  
  90
  
    
    printf("Base address                                   : 0x%X\n", config.base_addr);


  		




  
  91
  
    
    printf("    LCR configuration                          : 0x%02X\n", config.lcr);


  		




  
  92
  
    
    printf("        Number of bits per char                : %d\n", config.bits_per_char);


  		




  
  93
  
    
    printf("        Number of stop bits                    : %d\n", config.stop_bits);


  		




  
  94
  
    
    printf("        Parity                                 : ");


  		




  70
  95
  
    
    if((config.parity&1) == 0) printf("no parity\n");


  		




  71
  96
  
    
    else switch(config.parity){


  		




  72
  97
  
    
        case uart_parity_odd : printf("odd parity\n"     ); break;


  		




  ......




  75
  100
  
    
        case uart_parity_par0: printf("parity bit is 0\n"); break;


  		




  76
  101
  
    
        default              : printf("invalid\n"        ); break;


  		




  77
  102
  
    
    }


  		




  78
  
  
    
    printf("Break control: %d\n", config.break_control);


  		




  79
  
  
    
    printf("Divisor latch: %d\n", config.divisor_latch);


  		




  80
  
  
    
    printf("Bit rate: %d\n", UART_BITRATE/config.divisor_latch);


  		




  
  103
  
    
    printf("    Break control                              : %d\n", config.break_control);


  		




  
  104
  
    
    printf("    DLAB                                       : %d\n", config.dlab);


  		




  
  105
  
    

  		




  
  106
  
    
    printf("    IER configuration                          : 0x%02X\n", config.ier);


  		




  
  107
  
    
    printf("        Received data interrupts enabled       : %d\n", config.received_data_int);


  		




  
  108
  
    
    printf("        Transmitter empty interrupts enabled   : %d\n", config.transmitter_empty_int);


  		




  
  109
  
    
    printf("        Receiver line status interrupts enabled: %d\n", config.receiver_line_stat_int);


  		




  
  110
  
    
    printf("        Modem status interrupts enabled        : %d\n", config.modem_stat_int);


  		




  
  111
  
    

  		




  
  112
  
    
    printf("    Divisor latch (DLM & DLL)                  : %d\n", config.divisor_latch);


  		




  
  113
  
    
    printf("        Bit rate                               : %d\n", UART_BITRATE/config.divisor_latch);


  		




  81
  114
  
    
}


  		




  82
  115
  
    

  		




  83
  116
  
    
int uart_enable_divisor_latch(int base_addr){


  		












Also available in:  Unified diff