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 #include "lpc2xxx.h"
  10
  11 #define OSC_CLOCK               10000000
  12 #define BAUDRATE                9600
  13 #define P_DIV                   1
  14 #define P_CLOCK                 (OSC_CLOCK/P_DIV)
  15
  16 typedef unsigned char u8;
  17 typedef unsigned int u32;
  18
  19 void uart0_init(u32 br) {
  20
  21         /* pin select -> tx rx */
  22         PINSEL0&=~((1<<0)|(1<<1)|(1<<2)|(1<<3));
  23         PINSEL0|=((1<<0)|(1<<2));
  24
  25         /* divisor */
  26         UART0_LCR|=(1<<7);
  27         //UART0_DLL=((OSC_CLOCK/(16*br)))&0xff;
  28         //UART0_DLM=(((OSC_CLOCK/(16*br)))&0xff00)>>8;
  29         UART0_DLL=65;
  30         UART0_DLM=0;
  31
  32         /* 8 bit data */
  33         UART0_LCR=((1<<0)|(1<<1));
  34
  35         /* activate rx tx fifo */
  36         UART0_FCR|=((1<<0)|(1<<1)|(1<<2));
  37 }
  38
  39 void uart_send(u8 byte) {
  40
  41         /* wait for empty transmit buffer */
  42         while(!(UART0_LSR&(1<<5)))
  43                 continue;
  44
  45         UART0_THR=byte;
  46 }
  47
  48 int main(void) {
  49
  50         /* initialization */
  51         uart0_init(9600);
  52
  53         while(1) {
  54                 uart_send(0x23);
  55         }
  56
  57         return 0;
  58 }
  59