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btstack_uart_block_posix: drain output before changing baud rate

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This commit is contained in:
Matthias Ringwald 2021-02-27 22:55:59 +01:00
parent 0168d82ebc
commit 9233108786
1 changed files with 22 additions and 18 deletions
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40
platform/posix/btstack_uart_block_posix.c
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@ -176,29 +176,15 @@ static int btstack_uart_posix_set_baudrate(uint32_t baudrate){
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;
}
#ifndef __APPLE__
speed_t brate = baudrate; // let you override switch below if needed
switch(baudrate) {
case 9600: brate=B9600; break;
@ -251,11 +237,29 @@ static int btstack_uart_posix_set_baudrate(uint32_t baudrate){
}
cfsetospeed(&toptions, brate);
cfsetispeed(&toptions, brate);
#endif
if( tcsetattr(fd, TCSANOW, &toptions) < 0) {
// also set options for __APPLE__ to enforce write drain
// Mac OS Mojave: tcsdrain did not work as expected
if( tcsetattr(fd, TCSADRAIN, &toptions) < 0) {
log_error("Couldn't set term attributes");
return -1;
}
#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;
}
#endif
return 0;