| /* |
| * Licensed to the Apache Software Foundation (ASF) under one |
| * or more contributor license agreements. See the NOTICE file |
| * distributed with this work for additional information |
| * regarding copyright ownership. The ASF licenses this file |
| * to you under the Apache License, Version 2.0 (the |
| * "License"); you may not use this file except in compliance |
| * with the License. You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, |
| * software distributed under the License is distributed on an |
| * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY |
| * KIND, either express or implied. See the License for the |
| * specific language governing permissions and limitations |
| * under the License. |
| */ |
| #include <assert.h> |
| #include <stddef.h> |
| #include <inttypes.h> |
| #include "os/mynewt.h" |
| #include <uart/uart.h> |
| |
| /* |
| * RX is a ring buffer, which gets drained constantly. |
| * TX blocks until buffer has been completely transmitted. |
| */ |
| #define CONSOLE_HEAD_INC(cr) (((cr)->head + 1) & (sizeof((cr)->buf) - 1)) |
| #define CONSOLE_TAIL_INC(cr) (((cr)->tail + 1) & (sizeof((cr)->buf) - 1)) |
| |
| struct { |
| uint8_t head; |
| uint8_t tail; |
| uint8_t buf[16]; |
| } bs_uart_rx; |
| |
| struct { |
| uint8_t *ptr; |
| int cnt; |
| } volatile bs_uart_tx; |
| |
| static struct uart_dev *bs_uart; |
| |
| static int bs_rx_char(void *arg, uint8_t byte); |
| static int bs_tx_char(void *arg); |
| |
| int |
| boot_serial_uart_open(void) |
| { |
| struct uart_conf uc = { |
| .uc_speed = MYNEWT_VAL(CONSOLE_UART_BAUD), |
| .uc_databits = 8, |
| .uc_stopbits = 1, |
| .uc_parity = UART_PARITY_NONE, |
| .uc_flow_ctl = MYNEWT_VAL(CONSOLE_UART_FLOW_CONTROL), |
| .uc_tx_char = bs_tx_char, |
| .uc_rx_char = bs_rx_char, |
| }; |
| |
| bs_uart = (struct uart_dev *)os_dev_open(MYNEWT_VAL(CONSOLE_UART_DEV), |
| OS_TIMEOUT_NEVER, &uc); |
| if (!bs_uart) { |
| return -1; |
| } |
| return 0; |
| } |
| |
| void |
| boot_serial_uart_close(void) |
| { |
| os_dev_close(&bs_uart->ud_dev); |
| bs_uart_rx.head = 0; |
| bs_uart_rx.tail = 0; |
| bs_uart_tx.cnt = 0; |
| } |
| |
| static int |
| bs_rx_char(void *arg, uint8_t byte) |
| { |
| if (CONSOLE_HEAD_INC(&bs_uart_rx) == bs_uart_rx.tail) { |
| /* |
| * RX queue full. Reader must drain this. |
| */ |
| return -1; |
| } |
| bs_uart_rx.buf[bs_uart_rx.head] = byte; |
| bs_uart_rx.head = CONSOLE_HEAD_INC(&bs_uart_rx); |
| return 0; |
| } |
| |
| static uint8_t |
| bs_pull_char(void) |
| { |
| uint8_t ch; |
| |
| ch = bs_uart_rx.buf[bs_uart_rx.tail]; |
| bs_uart_rx.tail = CONSOLE_TAIL_INC(&bs_uart_rx); |
| return ch; |
| } |
| |
| int |
| boot_serial_uart_read(char *str, int cnt, int *newline) |
| { |
| int i; |
| int sr; |
| uint8_t ch; |
| |
| *newline = 0; |
| OS_ENTER_CRITICAL(sr); |
| for (i = 0; i < cnt; i++) { |
| if (bs_uart_rx.head == bs_uart_rx.tail) { |
| break; |
| } |
| |
| ch = bs_pull_char(); |
| if (ch == '\n') { |
| *str = '\0'; |
| *newline = 1; |
| break; |
| } |
| *str++ = ch; |
| } |
| OS_EXIT_CRITICAL(sr); |
| if (i > 0 || *newline) { |
| uart_start_rx(bs_uart); |
| } |
| return i; |
| } |
| |
| static int |
| bs_tx_char(void *arg) |
| { |
| uint8_t ch; |
| |
| if (!bs_uart_tx.cnt) { |
| return -1; |
| } |
| |
| bs_uart_tx.cnt--; |
| ch = *bs_uart_tx.ptr; |
| bs_uart_tx.ptr++; |
| return ch; |
| } |
| |
| #if MYNEWT_VAL(SELFTEST) |
| /* |
| * OS is not running, so native uart 'driver' cannot run either. |
| * At the moment unit tests don't check the responses to messages it |
| * sends, so we can drop the outgoing data here. |
| */ |
| void |
| boot_serial_uart_write(char *ptr, int cnt) |
| { |
| } |
| |
| #else |
| |
| void |
| boot_serial_uart_write(char *ptr, int cnt) |
| { |
| int sr; |
| |
| OS_ENTER_CRITICAL(sr); |
| bs_uart_tx.ptr = (uint8_t *)ptr; |
| bs_uart_tx.cnt = cnt; |
| OS_EXIT_CRITICAL(sr); |
| |
| uart_start_tx(bs_uart); |
| while (bs_uart_tx.cnt); |
| } |
| |
| #endif |