From: hackbard <hackbard@staubsauger.localdomain>
Date: Wed, 8 Aug 2007 01:38:59 +0000 (+0200)
Subject: more testing, still uart0 not working!
X-Git-Url: https://hackdaworld.org/gitweb/?a=commitdiff_plain;h=b6437bf5a7811ee84717854f95c515a137eb5b74;p=my-code%2Farm.git

more testing, still uart0 not working!
---

diff --git a/betty/fwbc.c b/betty/fwbc.c
index fecb753..a625716 100644
--- a/betty/fwbc.c
+++ b/betty/fwbc.c
@@ -10,48 +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(u32 br) {
+
+/* memory mapping */
+
+#define	MMAP_BL		0x00
+#define MMAP_RAM	0x02
+#define MMAP_EXT	0x03
+
+void mmap_init(u8 memtype) {
+
+	MEMMAP=memtype;
+}
+
+void uart0_init(void) {
 
 	/* pin select -> tx rx */
-	PINSEL0&=~((1<<0)|(1<<1)|(1<<2)|(1<<3));
-	PINSEL0|=((1<<0)|(1<<2));
+	PINSEL0=0x05;
 
-	/* divisor */
-	UART0_LCR|=(1<<7);
-	//UART0_DLL=((OSC_CLOCK/(16*br)))&0xff;
-	//UART0_DLM=(((OSC_CLOCK/(16*br)))&0xff00)>>8;
-	UART0_DLL=65;
-	UART0_DLM=0;
+	/* enable fifo */
+	UART0_FCR=0x07;
 
-	/* 8 bit data */
-	UART0_LCR=((1<<0)|(1<<1));
+	/* set dlab + word length */
+	UART0_LCR=0x83;
 
-	/* activate rx tx fifo */
-	UART0_FCR|=((1<<0)|(1<<1)|(1<<2));
+	/* set baud rate to 9600 @ 10/4 mhz */
+	UART0_DLL=0x10;
+	UART0_DLM=0x00;
+
+	/* unset dlab */
+	UART0_LCR=0x03;
 }
 
-void uart_send(u8 byte) {
+void uart_send(char *txbuf) {
+
+	int i;
+
+	i=0;
 
-	/* wait for empty transmit buffer */
-	while(!(UART0_LSR&(1<<5)))
-		continue;
+	while(txbuf[i])
+		UART0_THR=txbuf[i++];
+	UART0_THR='\n';
+	UART0_THR='\r';
 
-	UART0_THR=byte;
+	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;