improve USB CDC disconnect/reconnect checking
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aba4447a22
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345d84ffde
@ -47,5 +47,4 @@ char serial_read(void);
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bool serial_bytes_available(void);
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bool serial_connected(void);
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extern volatile bool _serial_connected;
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#endif // MICROPY_INCLUDED_SUPERVISOR_SERIAL_H
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@ -47,8 +47,6 @@ busio_uart_obj_t debug_uart;
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byte buf_array[64];
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#endif
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volatile bool _serial_connected;
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void serial_early_init(void) {
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#if defined(DEBUG_UART_TX) && defined(DEBUG_UART_RX)
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debug_uart.base.type = &busio_uart_type;
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@ -71,7 +69,9 @@ bool serial_connected(void) {
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#if defined(DEBUG_UART_TX) && defined(DEBUG_UART_RX)
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return true;
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#else
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return _serial_connected;
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// True if DTR is asserted, and the USB connection is up.
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// tud_cdc_get_line_state(): bit 0 is DTR, bit 1 is RTS
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return (tud_cdc_get_line_state() & 1) && tud_ready();
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#endif
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}
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@ -116,7 +116,6 @@ void tud_umount_cb(void) {
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// remote_wakeup_en : if host allows us to perform remote wakeup
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// USB Specs: Within 7ms, device must draw an average current less than 2.5 mA from bus
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void tud_suspend_cb(bool remote_wakeup_en) {
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_serial_connected = false;
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}
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// Invoked when usb bus is resumed
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@ -128,8 +127,6 @@ void tud_resume_cb(void) {
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void tud_cdc_line_state_cb(uint8_t itf, bool dtr, bool rts) {
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(void) itf; // interface ID, not used
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_serial_connected = dtr;
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// DTR = false is counted as disconnected
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if ( !dtr )
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{
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