From ba91618324aff639287dc512b0207017ad55ef98 Mon Sep 17 00:00:00 2001
From: liangkangnan <liangkangnan@163.com>
Date: Sun, 12 Apr 2020 19:36:06 +0800
Subject: [PATCH] add uart.c

Signed-off-by: liangkangnan <liangkangnan@163.com>
---
 tests/example/common.mk      |  1 +
 tests/example/include/uart.h |  2 ++
 tests/example/lib/uart.c     | 19 +++++++++++++++++++
 3 files changed, 22 insertions(+)
 create mode 100644 tests/example/lib/uart.c

diff --git a/tests/example/common.mk b/tests/example/common.mk
index 89482fe..fa660a7 100644
--- a/tests/example/common.mk
+++ b/tests/example/common.mk
@@ -23,6 +23,7 @@ ASM_SRCS += $(COMMON_DIR)/trap_entry.S
 C_SRCS += $(COMMON_DIR)/init.c
 C_SRCS += $(COMMON_DIR)/lib/utils.c
 C_SRCS += $(COMMON_DIR)/lib/xprintf.c
+C_SRCS += $(COMMON_DIR)/lib/uart.c
 
 
 LINKER_SCRIPT := $(COMMON_DIR)/link.lds
diff --git a/tests/example/include/uart.h b/tests/example/include/uart.h
index f727def..9d2c582 100644
--- a/tests/example/include/uart.h
+++ b/tests/example/include/uart.h
@@ -9,4 +9,6 @@
 
 #define UART0_REG(addr) (*((volatile uint32_t *)addr))
 
+void uart_init();
+
 #endif
diff --git a/tests/example/lib/uart.c b/tests/example/lib/uart.c
new file mode 100644
index 0000000..44c2759
--- /dev/null
+++ b/tests/example/lib/uart.c
@@ -0,0 +1,19 @@
+#include <stdint.h>
+
+#include "../include/uart.h"
+#include "../include/xprintf.h"
+
+
+static void uart_putc(uint8_t c)
+{
+    while (UART0_REG(UART0_STATUS) & 0x1);
+    UART0_REG(UART0_TXDATA) = c;
+}
+
+// 115200bps, 8 N 1
+void uart_init()
+{
+    UART0_REG(UART0_CTRL) = 0x1;
+
+    xdev_out(uart_putc);
+}