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/*
* Copyright (C) 2021 McMCC <mcmcc@mail.ru>
* ch341a_gpio.c
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include <libusb-1.0/libusb.h>
#include <stdio.h>
#include <stdlib.h>
#include <stdint.h>
#include <stdbool.h>
#include <string.h>
#define DEFAULT_TIMEOUT 1000
#define BULK_WRITE_ENDPOINT 0x02
#define BULK_READ_ENDPOINT 0x82
#define CH341A_CMD_UIO_STREAM 0xAB
#define CH341A_CMD_UIO_STM_IN 0x00
#define CH341A_CMD_UIO_STM_DIR 0x40
#define CH341A_CMD_UIO_STM_OUT 0x80
#define CH341A_CMD_UIO_STM_US 0xC0
#define CH341A_CMD_UIO_STM_END 0x20
#define DIR_MASK 0x3F /* D6,D7 - input, D0-D5 - output */
extern struct libusb_device_handle *handle;
static int usb_transf(const char *func, uint8_t type, uint8_t *buf, int len)
{
int ret, actuallen = 0;
if (handle == NULL)
return -1;
ret = libusb_bulk_transfer(handle, type, buf, len, &actuallen, DEFAULT_TIMEOUT);
if (ret < 0) {
printf("%s: Failed to %s %d bytes '%s'\n", func,
(type == BULK_WRITE_ENDPOINT) ? "write" : "read", len, strerror(-ret));
return -1;
}
return actuallen;
}
int ch341a_gpio_setdir(void)
{
uint8_t buf[] = {
CH341A_CMD_UIO_STREAM,
CH341A_CMD_UIO_STM_DIR | DIR_MASK,
CH341A_CMD_UIO_STM_END
};
return usb_transf(__func__, BULK_WRITE_ENDPOINT, buf, 3);
}
int ch341a_gpio_setbits(uint8_t bits)
{
uint8_t buf[] = {
CH341A_CMD_UIO_STREAM,
CH341A_CMD_UIO_STM_OUT | bits,
CH341A_CMD_UIO_STM_END
};
return usb_transf(__func__, BULK_WRITE_ENDPOINT, buf, 3);
}
int ch341a_gpio_getbits(uint8_t *data)
{
int ret;
uint8_t buf[] = {
CH341A_CMD_UIO_STREAM,
CH341A_CMD_UIO_STM_IN,
CH341A_CMD_UIO_STM_END
};
ret = usb_transf(__func__, BULK_WRITE_ENDPOINT, buf, 3);
if (ret < 0)
return -1;
ret = usb_transf(__func__, BULK_READ_ENDPOINT, buf, 1);
if (ret < 0)
return -1;
*data = buf[0];
return ret;
}
/* End of [ch341a_gpio.c] package */
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