/*
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* Copyright (C) 2015 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include <string.h>
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#include <stdio.h>
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#include <stdint.h>
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#include <termios.h>
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#include <unistd.h>
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#include <sys/fcntl.h>
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#include <sys/ioctl.h>
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#include <linux/i2c-dev.h>
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#include "stm32_bl.h"
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#include "uart.h"
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uint8_t uart_write_data(handle_t *handle, uint8_t *buffer, int length)
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{
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uart_handle_t *uart_handle = (uart_handle_t *)handle;
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buffer[length] = checksum(handle, buffer, length);
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if (write(uart_handle->fd, buffer, length + 1) == (length + 1))
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return CMD_ACK;
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else
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return CMD_NACK;
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}
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uint8_t uart_write_cmd(handle_t *handle, uint8_t cmd)
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{
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uart_handle_t *uart_handle = (uart_handle_t *)handle;
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uint8_t buffer[2 * sizeof(uint8_t)] = { cmd, ~cmd };
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int length = 2 * sizeof(uint8_t);
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if (cmd == CMD_UART_ENABLE)
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length--;
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if (write(uart_handle->fd, buffer, length) == length)
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return CMD_ACK;
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else
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return CMD_NACK;
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}
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uint8_t uart_read_data(handle_t *handle, uint8_t *data, int length)
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{
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uart_handle_t *uart_handle = (uart_handle_t *)handle;
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int ret;
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while (length > 0) {
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ret = read(uart_handle->fd, data, length);
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if (ret <= 0)
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return CMD_NACK;
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data += ret;
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length -= ret;
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}
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return CMD_ACK;
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}
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uint8_t uart_read_ack(handle_t *handle)
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{
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uint8_t buffer;
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if (handle->read_data(handle, &buffer, sizeof(uint8_t)) == CMD_ACK)
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return buffer;
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else
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return CMD_BUSY;
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}
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int uart_init(handle_t *handle)
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{
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uart_handle_t *uart_handle = (uart_handle_t *)handle;
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struct termios tio;
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int fl;
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handle->cmd_erase = CMD_ERASE;
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handle->cmd_read_memory = CMD_READ_MEMORY;
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handle->cmd_write_memory = CMD_WRITE_MEMORY;
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handle->no_extra_sync = 1;
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handle->write_data = uart_write_data;
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handle->write_cmd = uart_write_cmd;
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handle->read_data = uart_read_data;
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handle->read_ack = uart_read_ack;
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/* then switch the fd to blocking */
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fl = fcntl(uart_handle->fd, F_GETFL, 0);
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if (fl < 0)
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return fl;
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fl = fcntl(uart_handle->fd, F_SETFL, fl & ~O_NDELAY);
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if (fl < 0)
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return fl;
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if (tcgetattr(uart_handle->fd, &tio))
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memset(&tio, 0, sizeof(tio));
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tio.c_cflag = CS8 | CLOCAL | CREAD | PARENB;
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cfsetospeed(&tio, B57600);
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cfsetispeed(&tio, B57600);
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tio.c_iflag = 0; /* turn off IGNPAR */
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tio.c_oflag = 0; /* turn off OPOST */
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tio.c_lflag = 0; /* turn off CANON, ECHO*, etc */
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tio.c_cc[VTIME] = 5;
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tio.c_cc[VMIN] = 0;
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tcflush(uart_handle->fd, TCIFLUSH);
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tcsetattr(uart_handle->fd, TCSANOW, &tio);
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/* Init USART */
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uart_write_cmd(handle, CMD_UART_ENABLE);
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if (uart_read_ack(handle) == CMD_ACK)
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return 0;
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return -1;
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}
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