X-Git-Url: https://hackdaworld.org/gitweb/?a=blobdiff_plain;f=betty%2Ffwbc.c;h=a625716b4123a9b4c6d3f0d4108663a29b87c888;hb=d1ece6f866fffde0a4322a3819056fce3d4123b8;hp=46a342c8ab3e6e3101a8b00f70c1d0d6215b6973;hpb=2cdab277c293b22742ebf7888ca8ac40555f4f1d;p=my-code%2Farm.git

diff --git a/betty/fwbc.c b/betty/fwbc.c
index 46a342c..a625716 100644
--- 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;