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btstack/platform/posix/btstack_uart_block_posix.c

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/*
* Copyright (C) 2016 BlueKitchen GmbH
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of the copyright holders nor the names of
* contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
* 4. Any redistribution, use, or modification is done solely for
* personal benefit and not for any commercial purpose or for
* monetary gain.
*
* THIS SOFTWARE IS PROVIDED BY BLUEKITCHEN GMBH AND CONTRIBUTORS
* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL MATTHIAS
* RINGWALD OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF
* THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* Please inquire about commercial licensing options at
* contact@bluekitchen-gmbh.com
*
*/
#define BTSTACK_FILE__ "btstack_uart_block_posix.c"
/*
* btstack_uart_block_posix.c
*
* Common code to access serial port via asynchronous block read/write commands
*
*/
#include "btstack_uart_block.h"
#include "btstack_run_loop.h"
#include "btstack_debug.h"
#include <termios.h> /* POSIX terminal control definitions */
#include <fcntl.h> /* File control definitions */
#include <unistd.h> /* UNIX standard function definitions */
#include <string.h>
#include <errno.h>
#ifdef __APPLE__
#include <sys/ioctl.h>
#include <IOKit/serial/ioss.h>
#endif
// uart config
static const btstack_uart_config_t * uart_config;
// data source for integration with BTstack Runloop
static btstack_data_source_t transport_data_source;
// block write
static int write_bytes_len;
static const uint8_t * write_bytes_data;
// block read
static uint16_t read_bytes_len;
static uint8_t * read_bytes_data;
// callbacks
static void (*block_sent)(void);
static void (*block_received)(void);
static int btstack_uart_posix_init(const btstack_uart_config_t * config){
uart_config = config;
return 0;
}
static void btstack_uart_posix_process_write(btstack_data_source_t *ds) {
if (write_bytes_len == 0) return;
uint32_t start = btstack_run_loop_get_time_ms();
// write up to write_bytes_len to fd
int bytes_written = (int) write(ds->source.fd, write_bytes_data, write_bytes_len);
uint32_t end = btstack_run_loop_get_time_ms();
if (end - start > 10){
log_info("write took %u ms", end - start);
}
if (bytes_written == 0){
log_error("wrote zero bytes\n");
return;
}
if (bytes_written < 0) {
log_error("write returned error\n");
btstack_run_loop_enable_data_source_callbacks(ds, DATA_SOURCE_CALLBACK_WRITE);
return;
}
write_bytes_data += bytes_written;
write_bytes_len -= bytes_written;
if (write_bytes_len){
btstack_run_loop_enable_data_source_callbacks(ds, DATA_SOURCE_CALLBACK_WRITE);
return;
}
btstack_run_loop_disable_data_source_callbacks(ds, DATA_SOURCE_CALLBACK_WRITE);
// notify done
if (block_sent){
block_sent();
}
}
static void btstack_uart_posix_process_read(btstack_data_source_t *ds) {
if (read_bytes_len == 0) {
log_info("called but no read pending");
btstack_run_loop_disable_data_source_callbacks(ds, DATA_SOURCE_CALLBACK_READ);
}
uint32_t start = btstack_run_loop_get_time_ms();
// read up to bytes_to_read data in
ssize_t bytes_read = read(ds->source.fd, read_bytes_data, read_bytes_len);
// log_info("btstack_uart_posix_process_read need %u bytes, got %d", read_bytes_len, (int) bytes_read);
uint32_t end = btstack_run_loop_get_time_ms();
if (end - start > 10){
log_info("read took %u ms", end - start);
}
if (bytes_read == 0){
log_error("read zero bytes\n");
return;
}
if (bytes_read < 0) {
log_error("read returned error\n");
return;
}
read_bytes_len -= bytes_read;
read_bytes_data += bytes_read;
if (read_bytes_len > 0) return;
btstack_run_loop_disable_data_source_callbacks(ds, DATA_SOURCE_CALLBACK_READ);
if (block_received){
block_received();
}
}
static void hci_uart_posix_process(btstack_data_source_t *ds, btstack_data_source_callback_type_t callback_type) {
if (ds->source.fd < 0) return;
switch (callback_type){
case DATA_SOURCE_CALLBACK_READ:
btstack_uart_posix_process_read(ds);
break;
case DATA_SOURCE_CALLBACK_WRITE:
btstack_uart_posix_process_write(ds);
break;
default:
break;
}
}
static int btstack_uart_posix_set_baudrate(uint32_t baudrate){
int fd = transport_data_source.source.fd;
log_info("h4_set_baudrate %u", baudrate);
#ifdef __APPLE__
// From https://developer.apple.com/library/content/samplecode/SerialPortSample/Listings/SerialPortSample_SerialPortSample_c.html
// The IOSSIOSPEED ioctl can be used to set arbitrary baud rates
// other than those specified by POSIX. The driver for the underlying serial hardware
// ultimately determines which baud rates can be used. This ioctl sets both the input
// and output speed.
speed_t speed = baudrate;
if (ioctl(fd, IOSSIOSPEED, &speed) == -1) {
log_error("btstack_uart_posix_set_baudrate: error calling ioctl(..., IOSSIOSPEED, %u) - %s(%d).\n", baudrate, strerror(errno), errno);
return -1;
}
#else
struct termios toptions;
if (tcgetattr(fd, &toptions) < 0) {
log_error("btstack_uart_posix_set_baudrate: Couldn't get term attributes");
return -1;
}
speed_t brate = baudrate; // let you override switch below if needed
switch(baudrate) {
case 9600: brate=B9600; break;
case 19200: brate=B19200; break;
case 38400: brate=B38400; break;
case 57600: brate=B57600; break;
case 115200: brate=B115200; break;
#ifdef B230400
case 230400: brate=B230400; break;
#endif
#ifdef B460800
case 460800: brate=B460800; break;
#endif
#ifdef B500000
case 500000: brate=B500000; break;
#endif
#ifdef B576000
case 576000: brate=B576000; break;
#endif
#ifdef B921600
case 921600: brate=B921600; break;
#endif
#ifdef B1000000
case 1000000: brate=B1000000; break;
#endif
#ifdef B1152000
case 1152000: brate=B1152000; break;
#endif
#ifdef B1500000
case 1500000: brate=B1500000; break;
#endif
#ifdef B2000000
case 2000000: brate=B2000000; break;
#endif
#ifdef B2500000
case 2500000: brate=B2500000; break;
#endif
#ifdef B3000000
case 3000000: brate=B3000000; break;
#endif
#ifdef B3500000
case 3500000: brate=B3500000; break;
#endif
#ifdef B400000
case 4000000: brate=B4000000; break;
#endif
default:
log_error("can't set baudrate %dn", baudrate );
return -1;
}
cfsetospeed(&toptions, brate);
cfsetispeed(&toptions, brate);
if( tcsetattr(fd, TCSANOW, &toptions) < 0) {
log_error("Couldn't set term attributes");
return -1;
}
#endif
return 0;
}
static void btstack_uart_posix_set_parity_option(struct termios * toptions, int parity){
if (parity){
// enable even parity
toptions->c_cflag |= PARENB;
} else {
// disable even parity
toptions->c_cflag &= ~PARENB;
}
}
static void btstack_uart_posix_set_flowcontrol_option(struct termios * toptions, int flowcontrol){
if (flowcontrol) {
// with flow control
toptions->c_cflag |= CRTSCTS;
} else {
// no flow control
toptions->c_cflag &= ~CRTSCTS;
}
}
static int btstack_uart_posix_set_parity(int parity){
int fd = transport_data_source.source.fd;
struct termios toptions;
if (tcgetattr(fd, &toptions) < 0) {
log_error("Couldn't get term attributes");
return -1;
}
btstack_uart_posix_set_parity_option(&toptions, parity);
if(tcsetattr(fd, TCSANOW, &toptions) < 0) {
log_error("Couldn't set term attributes");
return -1;
}
return 0;
}
static int btstack_uart_posix_set_flowcontrol(int flowcontrol){
int fd = transport_data_source.source.fd;
struct termios toptions;
if (tcgetattr(fd, &toptions) < 0) {
log_error("Couldn't get term attributes");
return -1;
}
btstack_uart_posix_set_flowcontrol_option(&toptions, flowcontrol);
if(tcsetattr(fd, TCSANOW, &toptions) < 0) {
log_error("Couldn't set term attributes");
return -1;
}
return 0;
}
static int btstack_uart_posix_open(void){
const char * device_name = uart_config->device_name;
const int flowcontrol = uart_config->flowcontrol;
const uint32_t baudrate = uart_config->baudrate;
struct termios toptions;
int flags = O_RDWR | O_NOCTTY | O_NONBLOCK;
int fd = open(device_name, flags);
if (fd == -1) {
log_error("Unable to open port %s", device_name);
return -1;
}
if (tcgetattr(fd, &toptions) < 0) {
log_error("Couldn't get term attributes");
return -1;
}
cfmakeraw(&toptions); // make raw
// 8N1
toptions.c_cflag &= ~CSTOPB;
toptions.c_cflag |= CS8;
toptions.c_cflag |= CREAD | CLOCAL; // turn on READ & ignore ctrl lines
toptions.c_iflag &= ~(IXON | IXOFF | IXANY); // turn off s/w flow ctrl
// see: http://unixwiz.net/techtips/termios-vmin-vtime.html
toptions.c_cc[VMIN] = 1;
toptions.c_cc[VTIME] = 0;
// no parity
btstack_uart_posix_set_parity_option(&toptions, 0);
// flowcontrol
btstack_uart_posix_set_flowcontrol_option(&toptions, flowcontrol);
if(tcsetattr(fd, TCSANOW, &toptions) < 0) {
log_error("Couldn't set term attributes");
return -1;
}
// store fd in data source
transport_data_source.source.fd = fd;
// also set baudrate
if (btstack_uart_posix_set_baudrate(baudrate) < 0){
return -1;
}
// set up data_source
btstack_run_loop_set_data_source_fd(&transport_data_source, fd);
btstack_run_loop_set_data_source_handler(&transport_data_source, &hci_uart_posix_process);
btstack_run_loop_add_data_source(&transport_data_source);
// wait a bit - at least cheap FTDI232 clones might send the first byte out incorrectly
usleep(100000);
return 0;
}
static int btstack_uart_posix_close_new(void){
// first remove run loop handler
btstack_run_loop_remove_data_source(&transport_data_source);
// then close device
close(transport_data_source.source.fd);
transport_data_source.source.fd = -1;
return 0;
}
static void btstack_uart_posix_set_block_received( void (*block_handler)(void)){
block_received = block_handler;
}
static void btstack_uart_posix_set_block_sent( void (*block_handler)(void)){
block_sent = block_handler;
}
static void btstack_uart_posix_send_block(const uint8_t *data, uint16_t size){
// setup async write
write_bytes_data = data;
write_bytes_len = size;
// go
// btstack_uart_posix_process_write(&transport_data_source);
btstack_run_loop_enable_data_source_callbacks(&transport_data_source, DATA_SOURCE_CALLBACK_WRITE);
}
static void btstack_uart_posix_receive_block(uint8_t *buffer, uint16_t len){
read_bytes_data = buffer;
read_bytes_len = len;
btstack_run_loop_enable_data_source_callbacks(&transport_data_source, DATA_SOURCE_CALLBACK_READ);
// go
// btstack_uart_posix_process_read(&transport_data_source);
}
// static void btstack_uart_posix_set_sleep(uint8_t sleep){
// }
// static void btstack_uart_posix_set_csr_irq_handler( void (*csr_irq_handler)(void)){
// }
static const btstack_uart_block_t btstack_uart_posix = {
/* int (*init)(hci_transport_config_uart_t * config); */ &btstack_uart_posix_init,
/* int (*open)(void); */ &btstack_uart_posix_open,
/* int (*close)(void); */ &btstack_uart_posix_close_new,
/* void (*set_block_received)(void (*handler)(void)); */ &btstack_uart_posix_set_block_received,
/* void (*set_block_sent)(void (*handler)(void)); */ &btstack_uart_posix_set_block_sent,
/* int (*set_baudrate)(uint32_t baudrate); */ &btstack_uart_posix_set_baudrate,
/* int (*set_parity)(int parity); */ &btstack_uart_posix_set_parity,
/* int (*set_flowcontrol)(int flowcontrol); */ &btstack_uart_posix_set_flowcontrol,
/* void (*receive_block)(uint8_t *buffer, uint16_t len); */ &btstack_uart_posix_receive_block,
/* void (*send_block)(const uint8_t *buffer, uint16_t length); */ &btstack_uart_posix_send_block,
/* int (*get_supported_sleep_modes); */ NULL,
/* void (*set_sleep)(btstack_uart_sleep_mode_t sleep_mode); */ NULL,
/* void (*set_wakeup_handler)(void (*handler)(void)); */ NULL,
};
const btstack_uart_block_t * btstack_uart_block_posix_instance(void){
return &btstack_uart_posix;
}
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