more testing, still uart0 not working!

[my-code/arm.git] / betty / fwbc.c

diff --git a/betty/fwbc.c b/betty/fwbc.c
index 46a342c..a625716 100644 (file)
--- a/betty/fwbc.c
+++ b/betty/fwbc.c
@@ -10,43 +10,69 @@
 
 #define OSC_CLOCK              10000000
 #define BAUDRATE               9600
-#define P_DIV                  1
+#define P_DIV                  4
 #define P_CLOCK                        (OSC_CLOCK/P_DIV)
 
 typedef unsigned char u8;
+typedef unsigned int u32;
 
-void uart0_init(int br) {
 
-       PINSEL0&=~((0x03<<0)|(0x03<<2));        // clear bits 0-3
-       PINSEL0|=((1<<0)|(1<<2));               // pin select: tx, rx
+/* memory mapping */
 
-       UART0_LCR|=(1<<7);                      // enable access to divisor
-       UART0_DLL=(P_CLOCK/(br*16))&0xff;       // set divisor
-       UART0_DLL=((P_CLOCK/(br*16))&0xff00)>>8;
-       UART0_LCR&=~(1<<7);                     // disable access to divisor
+#define        MMAP_BL         0x00
+#define MMAP_RAM       0x02
+#define MMAP_EXT       0x03
 
-       UART0_LCR&=~(0x03<<2);                  // 1 stop bit, no parity
-       UART0_LCR|=0x03;                        // 8 data bits
+void mmap_init(u8 memtype) {
 
-       UART0_FCR=0x01;                         // activate fifo
+       MEMMAP=memtype;
 }
 
-void uart_send(u8 byte) {
+void uart0_init(void) {
 
-       /* wait for empty transmit buffer */
-       while(!(UART0_LSR&(1<<5)))
-               continue;
+       /* pin select -> tx rx */
+       PINSEL0=0x05;
 
-       UART0_THR=byte;
+       /* enable fifo */
+       UART0_FCR=0x07;
+
+       /* set dlab + word length */
+       UART0_LCR=0x83;
+
+       /* set baud rate to 9600 @ 10/4 mhz */
+       UART0_DLL=0x10;
+       UART0_DLM=0x00;
+
+       /* unset dlab */
+       UART0_LCR=0x03;
+}
+
+void uart_send(char *txbuf) {
+
+       int i;
+
+       i=0;
+
+       while(txbuf[i])
+               UART0_THR=txbuf[i++];
+       UART0_THR='\n';
+       UART0_THR='\r';
+
+       while(!(UART0_LSR&(1<<6))) {}
 }
 
 int main(void) {
 
+       char txbuf[]="uart0 working";
+
+       /* memory mapping of interrupt vectors to static ram */
+       mmap_init(MMAP_RAM);
+
        /* initialization */
-       uart0_init(9600);
+       uart0_init();
 
        while(1) {
-               uart_send(0x23);
+               uart_send(txbuf);
        }
 
        return 0;