tinyriscv/sdk/bsp/lib/uart.c

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#include <stdint.h>
#include "../include/uart.h"
#include "../include/xprintf.h"
// send one char to uart
void uart_putc(uint8_t c)
{
while (UART0_REG(UART0_STATUS) & 0x1);
UART0_REG(UART0_TXDATA) = c;
}
// Block, get one char from uart.
uint8_t uart_getc()
{
UART0_REG(UART0_STATUS) &= ~0x2;
while (!(UART0_REG(UART0_STATUS) & 0x2));
return (UART0_REG(UART0_RXDATA) & 0xff);
}
// 115200bps, 8 N 1
void uart_init()
{
// enable tx and rx
UART0_REG(UART0_CTRL) = 0x3;
xdev_out(uart_putc);
}