From acb1a47a78ef96a5fcfbae9013dcc7d39e30292e Mon Sep 17 00:00:00 2001 From: Matthijs Kooijman Date: Mon, 15 Jun 2015 21:17:35 +0200 Subject: Expose serial settings from CDC virtual serial port This allows a sketch to find out the settings chosen by the USB host (computer) and act accordingly. Other than reading the DTR flag and checking if the baudrate is 1200, the regular CDC code doesn't actually use any of these settings. By exposing these settings to the sketch, it can for example copy them to the hardware UART, turning the Leonardo into a proper USB-to-serial device. This can be useful to let the computer directly talk to whatever device is connected to the hardware serial port (like an XBee module). The Teensy core already supported these methods. This code was independently developed, but the method names were chosen to match the Teensy code, for compatibility (except that `dtr()` and `rtr()` return `bool`, while the Teensy version return a `uint8_t`). This change is applied to both the avr and sam cores, which have a very similar CDC implementation. --- cores/arduino/CDC.cpp | 27 +++++++++++++++++++++++++++ 1 file changed, 27 insertions(+) (limited to 'cores/arduino/CDC.cpp') diff --git a/cores/arduino/CDC.cpp b/cores/arduino/CDC.cpp index d694a2d..90a1698 100644 --- a/cores/arduino/CDC.cpp +++ b/cores/arduino/CDC.cpp @@ -18,6 +18,7 @@ #include "USBAPI.h" #include +#include #if defined(USBCON) @@ -205,6 +206,32 @@ Serial_::operator bool() { return result; } +unsigned long Serial_::baud() { + ATOMIC_BLOCK(ATOMIC_RESTORESTATE) { + return _usbLineInfo.dwDTERate; + } +} + +uint8_t Serial_::stopbits() { + return _usbLineInfo.bCharFormat; +} + +uint8_t Serial_::paritytype() { + return _usbLineInfo.bParityType; +} + +uint8_t Serial_::numbits() { + return _usbLineInfo.bDataBits; +} + +bool Serial_::dtr() { + return _usbLineInfo.lineState & 0x1; +} + +bool Serial_::rts() { + return _usbLineInfo.lineState & 0x2; +} + Serial_ Serial; #endif /* if defined(USBCON) */ -- cgit v1.2.3-18-g5258 From 31e0c941240f2b1d0e4f97d6e65d3a1ad66fbae5 Mon Sep 17 00:00:00 2001 From: Matthijs Kooijman Date: Thu, 30 Jul 2015 15:33:37 +0200 Subject: Add Serial_::readBreak() to process SEND_BREAK requests This allows detecting when the USB host sends a break request and what the value of the request was. See the comments in USBAPI.h for details. This just modifies the avr core, not the sam core. --- cores/arduino/CDC.cpp | 18 ++++++++++++++++++ 1 file changed, 18 insertions(+) (limited to 'cores/arduino/CDC.cpp') diff --git a/cores/arduino/CDC.cpp b/cores/arduino/CDC.cpp index 90a1698..5e872c5 100644 --- a/cores/arduino/CDC.cpp +++ b/cores/arduino/CDC.cpp @@ -32,6 +32,7 @@ typedef struct } LineInfo; static volatile LineInfo _usbLineInfo = { 57600, 0x00, 0x00, 0x00, 0x00 }; +static volatile int32_t breakValue = -1; #define WEAK __attribute__ ((weak)) @@ -76,6 +77,11 @@ bool CDC_Setup(USBSetup& setup) if (REQUEST_HOSTTODEVICE_CLASS_INTERFACE == requestType) { + if (CDC_SEND_BREAK == r) + { + breakValue = ((uint16_t)setup.wValueH << 8) | setup.wValueL; + } + if (CDC_SET_LINE_CODING == r) { USB_RecvControl((void*)&_usbLineInfo,7); @@ -207,6 +213,7 @@ Serial_::operator bool() { } unsigned long Serial_::baud() { + // Disable interrupts while reading a multi-byte value ATOMIC_BLOCK(ATOMIC_RESTORESTATE) { return _usbLineInfo.dwDTERate; } @@ -232,6 +239,17 @@ bool Serial_::rts() { return _usbLineInfo.lineState & 0x2; } +int32_t Serial_::readBreak() { + int32_t ret; + // Disable IRQs while reading and clearing breakValue to make + // sure we don't overwrite a value just set by the ISR. + ATOMIC_BLOCK(ATOMIC_RESTORESTATE) { + ret = breakValue; + breakValue = -1; + } + return ret; +} + Serial_ Serial; #endif /* if defined(USBCON) */ -- cgit v1.2.3-18-g5258 From 3baff3b4114f28cd6ae0bfbb25d4efeb6f03278b Mon Sep 17 00:00:00 2001 From: Peter Van Hoyweghen Date: Sat, 4 Jul 2015 08:28:52 +0200 Subject: Add Serial_::availableForWrite(). This makes the CDC "Serial" object on the Leonardo and similar boards support this recently introduced method as well. The CDC code in the sam core is not changed. --- cores/arduino/CDC.cpp | 5 +++++ 1 file changed, 5 insertions(+) (limited to 'cores/arduino/CDC.cpp') diff --git a/cores/arduino/CDC.cpp b/cores/arduino/CDC.cpp index 5e872c5..afbc65d 100644 --- a/cores/arduino/CDC.cpp +++ b/cores/arduino/CDC.cpp @@ -163,6 +163,11 @@ int Serial_::read(void) return USB_Recv(CDC_RX); } +int Serial_::availableForWrite(void) +{ + return USB_SendSpace(CDC_TX); +} + void Serial_::flush(void) { USB_Flush(CDC_TX); -- cgit v1.2.3-18-g5258