| // Copyright 2019 The Fuchsia Authors |
| // |
| // Use of this source code is governed by a MIT-style |
| // license that can be found in the LICENSE file or at |
| // https://opensource.org/licenses/MIT |
| |
| #include <stdint.h> |
| |
| #include "debug.h" |
| |
| #define UART_THR (0x0) // TX Buffer Register (write-only) |
| #define UART_LSR (0x14) // Line Status Register |
| #define UART_LSR_THRE (1 << 5) |
| |
| #define UARTREG(reg) (*(volatile uint32_t*)(0xf7e80c00 + (reg))) |
| |
| void uart_pputc(char c) { |
| while (!(UARTREG(UART_LSR) & UART_LSR_THRE)) |
| ; |
| UARTREG(UART_THR) = c; |
| } |
