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
  18 void uart0_init(int br) {
  19
  20         PINSEL0&=~((0x03<<0)|(0x03<<2));        // clear bits 0-3
  21         PINSEL0|=((1<<0)|(1<<2));               // pin select: tx, rx
  22
  23         UART0_LCR|=(1<<7);                      // enable access to divisor
  24         UART0_DLL=(P_CLOCK/(br*16))&0xff;       // set divisor
  25         UART0_DLL=((P_CLOCK/(br*16))&0xff00)>>8;
  26         UART0_LCR&=~(1<<7);                     // disable access to divisor
  27
  28         UART0_LCR&=~(0x03<<2);                  // 1 stop bit, no parity
  29         UART0_LCR|=0x03;                        // 8 data bits
  30
  31         UART0_FCR=0x01;                         // activate fifo
  32 }
  33
  34 void uart_send(u8 byte) {
  35
  36         /* wait for empty transmit buffer */
  37         while(!(UART0_LSR&(1<<5)))
  38                 continue;
  39
  40         UART0_THR=byte;
  41 }
  42
  43 int main(void) {
  44
  45         /* initialization */
  46         uart0_init(9600);
  47
  48         while(1) {
  49                 uart_send(0x23);
  50         }
  51
  52         return 0;
  53 }
  54