From 09e99ba42997be31d4226bd8d647b53e936debcb Mon Sep 17 00:00:00 2001
From: Mariano Alvira <mar@devl.org>
Date: Mon, 30 Mar 2009 14:07:42 -0400
Subject: [PATCH] this works, but there are unexplained things like why it
 can't print the whole message, why I can't enable RX, and why the baud number
 is what it is.

---
 tests/uart1-loopback.c | 57 ++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 57 insertions(+)
 create mode 100644 tests/uart1-loopback.c

diff --git a/tests/uart1-loopback.c b/tests/uart1-loopback.c
new file mode 100644
index 000000000..260f19fba
--- /dev/null
+++ b/tests/uart1-loopback.c
@@ -0,0 +1,57 @@
+#define GPIO_FUNC_SEL0  0x80000018 /* GPIO 15 - 0;  2 bit blocks */
+#define GPIO_FUNC_SEL1  0x8000001c /* GPIO 16 - 31; 2 bit blocks*/
+
+#define BASE_UART1      0x80005000
+#define UART1_CON       0x80005000
+#define UART1_STAT      0x80005004
+#define UART1_DATA      0x80005008
+#define UR1CON          0x8000500c
+#define UT1CON          0x80005010
+#define UART1_CTS       0x80005014
+#define UART1_BR        0x80005018
+
+#include "embedded_types.h"
+
+#define DELAY 1000
+
+void main(void) {
+
+	volatile uint32_t i;
+	
+	*(volatile uint32_t *)GPIO_FUNC_SEL0 = (0x01 << (14*2)); /* set GPIO14 to UART (UART1 TX)*/
+//	*(volatile uint32_t *)GPIO_FUNC_SEL0 = ( (0x01 << (14*2)) || (0x01 << (15*2)) ); /* set GPIO15-14 to UART (UART1 TX and RX)*/
+
+	*(volatile uint32_t *)UART1_BR = 0x004C03E8; /* Baud rate: (INC<<16 || MOD) */ /* is 115200 @ 24 MHz --- unexplained */
+
+	*(volatile uint32_t *)UART1_CON = 0x00000003; /* enable receive and transmit */
+
+
+	while(1) {
+		for(i=0; i<DELAY; i++) { continue; }
+		*(volatile uint32_t *)UART1_DATA = 'H';
+/*		for(i=0; i<DELAY; i++) { continue; }
+		*(volatile uint32_t *)UART1_DATA = 'e';
+		for(i=0; i<DELAY; i++) { continue; }
+		*(volatile uint32_t *)UART1_DATA = 'l';
+		for(i=0; i<DELAY; i++) { continue; }
+		*(volatile uint32_t *)UART1_DATA = 'l';
+		for(i=0; i<DELAY; i++) { continue; }
+		*(volatile uint32_t *)UART1_DATA = 'o';
+		for(i=0; i<DELAY; i++) { continue; }
+		*(volatile uint32_t *)UART1_DATA = ' ';
+		*(volatile uint32_t *)UART1_DATA = 'W';
+		*(volatile uint32_t *)UART1_DATA = 'o';
+		*(volatile uint32_t *)UART1_DATA = 'r';
+		*(volatile uint32_t *)UART1_DATA = 'l';
+		*(volatile uint32_t *)UART1_DATA = 'd';
+		*(volatile uint32_t *)UART1_DATA = '\n';
+		*(volatile uint32_t *)UART1_DATA = '\r';*/
+	}
+
+/* 	while(1) { */
+/* 		if(*(volatile uint32_t*)UR1CON > 0) { */
+/* 			/\* Receive buffer isn't empty *\/ */
+/* 			/\* read a byte and write it to the transmit buffer *\/ */
+/* 		} */
+/* 	}; */
+}