betty/fwbc.c

   1 /*
   2  * fwbc.c - broadcast the betty tv original firmware via uart0
   3  *          use fwdump to write it onto your computers harddisk
   4  *
   5  * author: hackbard@hackdaworld.org
   6  *
   7  */
   8
   9 /*
  10  * include files
  11  */
  12
  13 #include "lpc2xxx.h"
  14
  15 /*
  16  * defines
  17  */
  18
  19 /* misc */
  20 #define OSC_CLOCK               10000000
  21 #define BAUDRATE                9600
  22 #define P_DIV                   4
  23 #define P_CLOCK                 (OSC_CLOCK/P_DIV)
  24
  25 /* memory mapping */
  26 #define MMAP_BL                 0x00
  27 #define MMAP_RAM                0x02
  28 #define MMAP_EXT                0x03
  29
  30 /* band 0/2 addr */
  31 #define BANK0                   0x80000000
  32 #define BANK2                   0x82000000
  33
  34 /*
  35  * type definitions
  36  */
  37
  38 typedef unsigned char u8;
  39 typedef unsigned short u16;
  40 typedef unsigned int u32;
  41
  42 /*
  43  * function prototypes
  44  */
  45
  46 void mmap_init(u8 memtype);
  47 void uart0_init(void);
  48 void uart0_send_string(char *txbuf);
  49 void uart0_send_char(char send);
  50
  51 /*
  52  * main function
  53  */
  54
  55 int main(void) {
  56
  57         /* variables */
  58
  59         u16 *flash;
  60         u32 i;
  61         u8 start;
  62
  63         /* memory mapping of interrupt vectors to static ram */
  64
  65         //mmap_init(MMAP_RAM);
  66
  67         /* uart initialization */
  68
  69         //uart0_init();
  70
  71         PINSEL0=0x05;                   // pin select -> tx, rx
  72         UART0_FCR=0x07;                 // enable fifo
  73         UART0_LCR=0x83;                 // set dlab + word length
  74         UART0_DLL=0x10;                 // br: 9600 @ 10/4 mhz
  75         UART0_DLM=0x00;
  76         UART0_LCR=0x03;                 // unset dlab
  77
  78         /* external memory init */
  79
  80         BCFG0=0x1000FBEF;               // no boot[1:0] influence? (thnx colibri)
  81                                         // BCFG2 should be fine as is
  82         flash=(u16 *)BANK0;
  83
  84         /* wait for fwdump to send transmit start character */
  85         start=0;
  86         while(start!=0x23) {
  87                 while(!(UART0_LSR&(1<<0)))
  88                         continue;
  89                 start=UART0_RBR;
  90         }
  91
  92         /* transmit 1 mb of data */
  93         for(i=0;i<524288;i++) {
  94                 while(!(UART0_LSR&(1<<5)))
  95                         continue;
  96                 UART0_THR=(*flash&0xff);                // care for endianness
  97                 while(!(UART0_LSR&(1<<5)))
  98                         continue;
  99                 UART0_THR=((*flash&0xff00)>>8);
 100                 flash++;
 101         }
 102
 103         return 0;
 104 }
 105
 106 /*
 107  * functions
 108  */
 109
 110 void mmap_init(u8 memtype) {
 111
 112         MEMMAP=memtype;
 113 }
 114
 115 void uart0_init(void) {
 116
 117         PINSEL0=0x05;                   // pin select -> tx, rx
 118         UART0_FCR=0x07;                 // enable fifo
 119         UART0_LCR=0x83;                 // set dlab + word length
 120         UART0_DLL=0x10;                 // br: 9600 @ 10/4 mhz
 121         UART0_DLM=0x00;
 122         UART0_LCR=0x03;                 // unset dlab
 123 }
 124
 125 void uart0_send_string(char *txbuf) {
 126
 127         int i;
 128
 129         i=0;
 130
 131         while(txbuf[i])
 132                 UART0_THR=txbuf[i++];
 133         UART0_THR='\n';
 134         UART0_THR='\r';
 135
 136         while(!(UART0_LSR&(1<<6))) {}
 137 }
 138
 139 void uart0_send_char(char send) {
 140
 141         while(!(UART0_LSR&(1<<5)))
 142                 continue;
 143
 144         UART0_THR=send;
 145 }
 146