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