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tb/sw/axi_uart/uart.c

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+
+
+#include <stdint.h>
+#include "uart.h"
+
+
+#ifndef UART_BASE
+#error UART Base address not define!!!
+#endif
+
+
+volatile uint32_t *uart_rfifo = (uint32_t*)( UART_BASE + RX_FIFO );
+volatile uint32_t *uart_tfifo = (uint32_t*)( UART_BASE + TX_FIFO );
+volatile uint32_t *uart_status = (uint32_t*)( UART_BASE + STAT_REG );
+volatile uint32_t *uart_ctrl = (uint32_t*)( UART_BASE + CTRL_REG );
+
+
+int32_t uart_init()
+{
+	//reset rx & tx fifo, disable interrupt
+	(*uart_status) = 0x03;
+	(*uart_status) = 0x00;
+
+	return 0;
+}
+
+
+
+int32_t uart_sendByte( uint8_t data )
+{
+	#if(1)	
+	//wait unitl tx fifo not full
+	while( ((*uart_status) & 0x08) != 0);
+	*uart_tfifo = data;
+	#else
+	(*(volatile uint32_t*)(0x60000000)) = data;
+	#endif
+	
+	return 0;
+}
+
+
+uint8_t uart_recByte()
+{
+	//wait unitl rx fifo has data
+	while( ((*uart_status) & 0x01) == 0);
+
+	return (uint8_t)(*uart_rfifo);
+}
+
+
+
+int32_t print_uart(const char *str)
+{
+	const char *cur = &str[0];
+	while (*cur != '\0')
+	{
+		uart_sendByte((uint8_t)*cur);
+		cur++;
+	}
+
+	return 0;
+}
+
+
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tb/sw/axi_uart/uart.h

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+#ifndef _UART_H_
+#define _UART_H_
+
+#include <stdint.h>
+
+#define UART_BASE 0x60000000U
+
+
+
+#define RX_FIFO		0x0000
+#define TX_FIFO 	0x0004
+#define STAT_REG	0x0008
+#define CTRL_REG	0x000c
+
+
+extern int32_t uart_init();
+extern int32_t uart_sendByte( uint8_t data );
+extern uint8_t uart_recByte();
+extern int32_t print_uart(const char *str);
+
+
+
+
+#endif
+
+