/*
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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 <stdio.h>
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#include <stdint.h>
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#include <unistd.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 "i2c.h"
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uint8_t i2c_write_data(handle_t *handle, uint8_t *buffer, int length)
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{
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i2c_handle_t *i2c_handle = (i2c_handle_t *)handle;
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buffer[length] = checksum(handle, buffer, length);
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if (write(i2c_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 i2c_write_cmd(handle_t *handle, uint8_t cmd)
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{
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uint8_t buffer[sizeof(uint8_t)+1] =
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{
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cmd
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};
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return handle->write_data(handle, buffer, sizeof(uint8_t));
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}
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uint8_t i2c_read_data(handle_t *handle, uint8_t *data, int length)
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{
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i2c_handle_t *i2c_handle = (i2c_handle_t *)handle;
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if (read(i2c_handle->fd, data, 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 i2c_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_NACK;
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}
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int i2c_init(handle_t *handle)
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{
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i2c_handle_t *i2c_handle = (i2c_handle_t *)handle;
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handle->cmd_erase = CMD_ERASE_NS;
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handle->cmd_read_memory = CMD_READ_MEMORY;
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handle->cmd_write_memory = CMD_WRITE_MEMORY_NS;
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handle->no_extra_sync = 0;
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handle->write_data = i2c_write_data;
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handle->write_cmd = i2c_write_cmd;
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handle->read_data = i2c_read_data;
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handle->read_ack = i2c_read_ack;
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if (ioctl(i2c_handle->fd, I2C_SLAVE, i2c_handle->addr) < 0) {
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perror("Error setting slave addr");
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return -1;
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} else {
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return 0;
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}
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}
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