X-Git-Url: https://hackdaworld.org/gitweb/?a=blobdiff_plain;f=betty%2Fuart.c;fp=betty%2Fuart.c;h=5760e3b45dd4467ec29b680ee6f26286ee1022b1;hb=b4ca71fc214ba3c58cec25661ba1f81cf7b1b871;hp=0000000000000000000000000000000000000000;hpb=d6814c7408b23db8a441f731b44d4b638df24c64;p=my-code%2Farm.git

diff --git a/betty/uart.c b/betty/uart.c
new file mode 100644
index 0000000..5760e3b
--- /dev/null
+++ b/betty/uart.c
@@ -0,0 +1,105 @@
+/*
+ * uart.c - uart0/1 api
+ *
+ * author: hackbard@hackdaworld.org
+ *
+ */
+
+#include "uart.h"
+
+/*
+ * functions
+ */
+
+void uart0_init(void) {
+
+	/* select pins 0.0 and 0.1 as tx and rx */
+	PINSEL0=(PINSEL0&~(0xf))|0x05;
+
+	/* configure uart 0 */
+	UART0_FCR=0x07;			// enable fifo
+	UART0_LCR=0x83;			// set dlab + word length
+	UART0_DLL=0x04;			// br: 115200
+	UART0_DLM=0x00;	
+	UART0_LCR=0x03;			// unset dlab
+}
+
+void uart0_send_string(char *txbuf) {
+
+	int i;
+
+	i=0;
+
+	while(txbuf[i]) {
+		UART0_THR=txbuf[i++];
+		/* flush if tx buffer maximum reached */
+		if(!(i%16))
+			while(!(UART0_LSR&(1<<6)))
+				continue;
+	}
+	
+	/* flush if \n and \r do not fit in the tx buffer */
+	if(i>14)
+		while(!(UART0_LSR&(1<<6)))
+			continue;
+
+	UART0_THR='\n';
+	UART0_THR='\r';
+
+	/* flush uart0 anyways */
+	while(!(UART0_LSR&(1<<6)))
+		continue;
+}
+
+void uart0_send_buf16(u16 *buf,int len) {
+
+	int i;
+
+	i=0;
+
+	for(i=0;i<len/2;i++) {
+		if(!(i%8))
+			while(!(UART0_LSR&(1<<6)))
+				continue;
+		UART0_THR=buf[i]&0xff;
+		UART0_THR=(buf[i]>>8)&0xff;
+	}
+}
+
+void uart0_send_buf32(u32 *buf,int len) {
+
+	int i;
+
+	i=0;
+
+	for(i=0;i<len/4;i++) {
+		if(!(i%4))
+			while(!(UART0_LSR&(1<<6)))
+				continue;
+		UART0_THR=buf[i]&0xff;
+		UART0_THR=(buf[i]>>8)&0xff;
+		UART0_THR=(buf[i]>>16)&0xff;
+		UART0_THR=(buf[i]>>24)&0xff;
+	}
+}
+
+void uart0_send_byte(u8 send) {
+
+	while(!(UART0_LSR&(1<<5)))
+		continue;
+
+	UART0_THR=send;
+}
+
+u8 uart0_get_byte(void) {
+
+	u8 rx;
+
+	while(!(UART0_LSR&(1<<0)))
+		continue;
+
+	rx=UART0_RBR;
+
+	return rx;
+}
+