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| author | Jeff Epler <jeff@adafruit.com> | 2020-10-31 09:35:48 -0500 |
|---|---|---|
| committer | GitHub <noreply@github.com> | 2020-10-31 09:35:48 -0500 |
| commit | bbed1b03546802c03f3f20cdcb36d23cd54d047b (patch) | |
| tree | 336f5e1e30ec3ca7edc10e473992b6e0b10a59f1 /supervisor/shared/serial.c | |
| parent | aba4447a22d8d873d2a3097d7eba12494242ca0d (diff) | |
| parent | 345d84ffde527b16f50c203f7b6a718886be34f6 (diff) | |
Merge pull request #3624 from dhalbert/usb-serial-detect-2
improve USB CDC disconnect/reconnect checking
Diffstat (limited to 'supervisor/shared/serial.c')
| -rw-r--r-- | supervisor/shared/serial.c | 6 |
1 files changed, 3 insertions, 3 deletions
diff --git a/supervisor/shared/serial.c b/supervisor/shared/serial.c index 91e90671d..7383cc228 100644 --- a/supervisor/shared/serial.c +++ b/supervisor/shared/serial.c @@ -47,8 +47,6 @@ busio_uart_obj_t debug_uart; byte buf_array[64]; #endif -volatile bool _serial_connected; - void serial_early_init(void) { #if defined(DEBUG_UART_TX) && defined(DEBUG_UART_RX) debug_uart.base.type = &busio_uart_type; @@ -71,7 +69,9 @@ bool serial_connected(void) { #if defined(DEBUG_UART_TX) && defined(DEBUG_UART_RX) return true; #else - return _serial_connected; + // True if DTR is asserted, and the USB connection is up. + // tud_cdc_get_line_state(): bit 0 is DTR, bit 1 is RTS + return (tud_cdc_get_line_state() & 1) && tud_ready(); #endif } |