commit 05dc2bf82496f16aabe42e20c5c7e6ccf942007f Author: Szymon Łopaciuk Date: Sun Jan 31 00:23:37 2021 +0000 initial commit Signed-off-by: Szymon Łopaciuk diff --git a/.gitignore b/.gitignore new file mode 100644 index 0000000..89cc49c --- /dev/null +++ b/.gitignore @@ -0,0 +1,5 @@ +.pio +.vscode/.browse.c_cpp.db* +.vscode/c_cpp_properties.json +.vscode/launch.json +.vscode/ipch diff --git a/.vscode/extensions.json b/.vscode/extensions.json new file mode 100644 index 0000000..0f0d740 --- /dev/null +++ b/.vscode/extensions.json @@ -0,0 +1,7 @@ +{ + // See http://go.microsoft.com/fwlink/?LinkId=827846 + // for the documentation about the extensions.json format + "recommendations": [ + "platformio.platformio-ide" + ] +} diff --git a/LICENSE b/LICENSE new file mode 100644 index 0000000..f288702 --- /dev/null +++ b/LICENSE @@ -0,0 +1,674 @@ + GNU GENERAL PUBLIC LICENSE + Version 3, 29 June 2007 + + Copyright (C) 2007 Free Software Foundation, Inc. + Everyone is permitted to copy and distribute verbatim copies + of this license document, but changing it is not allowed. + + Preamble + + The GNU General Public License is a free, copyleft license for +software and other kinds of works. + + The licenses for most software and other practical works are designed +to take away your freedom to share and change the works. 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If not, see . + +Also add information on how to contact you by electronic and paper mail. + + If the program does terminal interaction, make it output a short +notice like this when it starts in an interactive mode: + + Copyright (C) + This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'. + This is free software, and you are welcome to redistribute it + under certain conditions; type `show c' for details. + +The hypothetical commands `show w' and `show c' should show the appropriate +parts of the General Public License. Of course, your program's commands +might be different; for a GUI interface, you would use an "about box". + + You should also get your employer (if you work as a programmer) or school, +if any, to sign a "copyright disclaimer" for the program, if necessary. +For more information on this, and how to apply and follow the GNU GPL, see +. + + The GNU General Public License does not permit incorporating your program +into proprietary programs. If your program is a subroutine library, you +may consider it more useful to permit linking proprietary applications with +the library. If this is what you want to do, use the GNU Lesser General +Public License instead of this License. But first, please read +. diff --git a/README.md b/README.md new file mode 100644 index 0000000..f148912 --- /dev/null +++ b/README.md @@ -0,0 +1,16 @@ +# stm32-adb2usb [WIP] + +A simple implementation of an ADB to USB converter for the STM32F103 'Blue Pill'. +This is work in progress and is not yet functional. +Testing done on an STM32F103 (or rather actually a Chinese clone), but in the end should be compatible with other STM32 microcontrollers/boards. + +## Useful resources + +I aim to make the code as easy to follow as it is possible in this case, especially the part relating to the ADB protocol. +However, there are some resources that are very useful in understanding how the protocol works, and which I used: + +- [ADB - The Untold Story: Space Aliens Ate My Mouse'](https://developer.apple.com/library/archive/technotes/hw/hw_01.html#//apple_ref/doc/uid/DTS10002470) by Apple, the most 'authoritative' source, but lacks some key spec features +- https://web.archive.org/save/http://85.226.187.247/_pdf/Processor_Memory/PIC1617/MIDRANGE/00591A.PDF +- Inside Macintosh volume V, pages 191-192, for the keycodes +- [This blog post](https://www.bigmessowires.com/2016/03/30/understanding-the-adb-service-request-signal/) which explains `Srq` and `Tlt` + diff --git a/lib/README b/lib/README new file mode 100644 index 0000000..6debab1 --- /dev/null +++ b/lib/README @@ -0,0 +1,46 @@ + +This directory is intended for project specific (private) libraries. +PlatformIO will compile them to static libraries and link into executable file. + +The source code of each library should be placed in a an own separate directory +("lib/your_library_name/[here are source files]"). + +For example, see a structure of the following two libraries `Foo` and `Bar`: + +|--lib +| | +| |--Bar +| | |--docs +| | |--examples +| | |--src +| | |- Bar.c +| | |- Bar.h +| | |- library.json (optional, custom build options, etc) https://docs.platformio.org/page/librarymanager/config.html +| | +| |--Foo +| | |- Foo.c +| | |- Foo.h +| | +| |- README --> THIS FILE +| +|- platformio.ini +|--src + |- main.c + +and a contents of `src/main.c`: +``` +#include +#include + +int main (void) +{ + ... +} + +``` + +PlatformIO Library Dependency Finder will find automatically dependent +libraries scanning project source files. + +More information about PlatformIO Library Dependency Finder +- https://docs.platformio.org/page/librarymanager/ldf.html diff --git a/platformio.ini b/platformio.ini new file mode 100644 index 0000000..d117a30 --- /dev/null +++ b/platformio.ini @@ -0,0 +1,43 @@ +; PlatformIO Project Configuration File +; +; Build options: build flags, source filter +; Upload options: custom upload port, speed and extra flags +; Library options: dependencies, extra library storages +; Advanced options: extra scripting +; +; Please visit documentation for the other options and examples +; https://docs.platformio.org/page/projectconf.html + +[env:bluepill_f103c8_128k] +platform = ststm32 +board = bluepill_f103c8_128k +framework = arduino +lib_extra_dirs = ~/Documents/Arduino/libraries +build_flags = + -D PIO_FRAMEWORK_ARDUINO_ENABLE_HID + -D USBCON + -D USBD_VID=0x0483 + -D USBD_PID=0x5711 + -D USB_MANUFACTURER="STMicroelectronics" + -D USB_PRODUCT="Apple Desktop Bus Device" + -D HAL_PCD_MODULE_ENABLED +upload_flags = -c set CPUTAPID 0x2ba01477 ; Chinese clone, genuine is 0x1ba01477 +debug_tool = stlink +upload_protocol = stlink +debug_server = + /Users/szymonlopaciuk/.platformio/packages/tool-openocd/bin/openocd + -s /Users/szymonlopaciuk/.platformio/packages/tool-openocd/scripts + -f interface/stlink-v2.cfg + -c "transport select hla_swd" + -c "set CPUTAPID 0x2ba01477" ; Chinese clone, genuine is 0x1ba01477 + -f target/stm32f1x.cfg + -c "reset_config none" +test_ignore = test_desktop + +[env:native] +platform = native +build_flags = + -D USBCON + -D USBD_USE_HID_COMPOSITE + -I $PROJECT_DIR/test/test_desktop/include +test_build_project_src = true \ No newline at end of file diff --git a/src/adb.h b/src/adb.h new file mode 100644 index 0000000..f3641be --- /dev/null +++ b/src/adb.h @@ -0,0 +1,157 @@ +#ifndef ADB_h +#define ADB_h + +#include +#include + +#define ADB_DATA_PIN PB4 +#define ADB_DATA_PORT GPIOB +#define ADB_DATA_PIN_NO 4 +#define ADB_WRITE(bit) digitalWrite(ADB_DATA_PIN, bit) +//#define ADB_WRITE(bit) HAL_GPIO_WritePin(ADB_DATA_PORT, ADB_DATA_PIN_NO, (GPIO_PinState)(bit)); +#define ADB_READ() (digitalRead(ADB_DATA_PIN)) +//#define ADB_READ() HAL_GPIO_ReadPin(ADB_DATA_PORT, ADB_DATA_PIN_NO) + +#define ADB_ADDRESS(addr) (addr << 4) +#define ADB_REGISTER(reg) (reg) +#define ADB_CMD_TALK 0b1100 +#define ADB_CMD_LISTEN 0b1000 +#define ADB_CMD_FLUSH 0b0001 + +// Reset: signal low for 3 ms. +static void adb_reset() { + ADB_WRITE(LOW); + delayMicroseconds(3000); + ADB_WRITE(HIGH); +} + +// Attention: signal low for 800 μs. +static void adb_attention() { + ADB_WRITE(LOW); + delayMicroseconds(800); + ADB_WRITE(HIGH); +} + +// Sync: signal high for 70 μs. +static void adb_sync() { + ADB_WRITE(HIGH); + delayMicroseconds(70); + ADB_WRITE(LOW); +} + +// Send a single on ADB_DATA_PIN. +// '0' if bit == 0x0: write 65 μs LOW, 35 μs HIGH. +// '1' if bit >= 0x1: write 35 μs LOW, 65 μs HIGH. +static void adb_write_bit(uint16_t bit) { + if (bit) { // '1' bit + ADB_WRITE(LOW); + delayMicroseconds(35); + + ADB_WRITE(HIGH); + delayMicroseconds(65); + } + else { // '0' bit + ADB_WRITE(LOW); + delayMicroseconds(65); + + ADB_WRITE(HIGH); + delayMicroseconds(35); + } +} + +// Send `length` least significant bits from `bits`, +// starting with the most significant bit. +static void adb_write_bits(uint16_t bits, uint8_t length) { + uint16_t mask = 1 << (length - 1); + while (mask) { + adb_write_bit(bits & mask); + mask >>= 1; + } +} + +// Send the '0' stop bit, and listen for an SRQ. +// ``If a device in need of service issues a service request, +// it must do so within the 65 μs of the Stop Bit’s low time +// and maintain the line low for a total of 300 μs.'' +// Returns true if there was an SRQ. +static bool adb_stop_bit_srq_listen() { + adb_write_bit(0); + // TODO: Properly handle SRQ, currently waits it out: + auto time_end_stop_bit = micros(); + while (ADB_READ() == LOW && micros() - time_end_stop_bit < 300 - 35) { // TODO: does it make sense to timeout? + delayMicroseconds(5); + } + return false; +} + +// Write a command to the bus. +void adb_write_command(uint8_t command_byte) { + adb_attention(); + adb_sync(); + adb_write_bits((uint16_t)command_byte, 8); + adb_stop_bit_srq_listen(); // TODO: Handle the SRQ +} + +// Stop-to-start time: period of 160 - 240 μs before device's +// response when the bus is held high. +// Returns: true if the response is starting, false if timeout +static bool adb_wait_tlt() { + // spec says 160 μs, but it seems that Macintoshes allowed 140 μs, + // (see `ADB - The Untold Story: Space Aliens Ate My Mouse'): + delayMicroseconds(140); + + return true; +} + +// Read a single bit from the bus. +static uint8_t adb_read_bit() { + auto time_start = micros(); + + while (ADB_READ() == LOW) { + // devices need to stick to 30% precision, 65 * 1.3 = 85 μs + // if this time is exceeded assume timeout + if (micros() - time_start > 85) + return 0xFF; + } + auto low_time = micros() - time_start; + + while (ADB_READ() == HIGH) { + // devices need to stick to 30% precision, 65 * 1.3 = 85 μs + // if this time is exceeded assume timeout + if (micros() - time_start - low_time > 85) + return 0xFF; + } + auto high_time = micros() - time_start - low_time; + + return (low_time < high_time) ? 0x1 : 0x0; +} + +// Read `length` bits from the bus into `buffer`. +bool adb_read_data_packet(uint16_t* buffer, uint8_t length) +{ + uint8_t start_bit = adb_read_bit(); // should equal to '1' + if (start_bit != 0x1) {return false;} + + *buffer = 0; + for (uint8_t i = 0; i < length; i++) + { + uint8_t current_bit = adb_read_bit(); + if (current_bit == 0xFF) return false; + *buffer <<= 1; + *buffer |= current_bit; + } + + /* uint8_t stop_bit = */ adb_read_bit(); // should equal to '0' + return true; +} + +void adb_init() { + pinMode(ADB_DATA_PIN, OUTPUT_OPEN_DRAIN); + digitalWrite(ADB_DATA_PIN, HIGH); + + while (ADB_READ() == LOW); // wait for the bus + + adb_reset(); +} + +#endif \ No newline at end of file diff --git a/src/keymap.h b/src/keymap.h new file mode 100644 index 0000000..0144b14 --- /dev/null +++ b/src/keymap.h @@ -0,0 +1,12 @@ +#ifndef KEYMAP_h +#define KEYMAP_h +#include + +#define KEY_POWER 0x66 + +#define ADB_KEY_POWER_DOWN 0x7F7F +#define ADB_KEY_POWER_UP 0xFFFF + +uint8_t* adb_keycode_to_hid = {0x0}; // TODO + +#endif \ No newline at end of file diff --git a/src/main.cpp b/src/main.cpp new file mode 100644 index 0000000..cbfd7e0 --- /dev/null +++ b/src/main.cpp @@ -0,0 +1,67 @@ +#ifndef UNIT_TEST + +#include +#include +#include +#include "adb.h" + +void setup() { + Keyboard.begin(); + pinMode(PC13, OUTPUT); + digitalWrite(PC13, LOW); + + delay(5000); + digitalWrite(PC13, HIGH); + + Keyboard.print("Setting up IO...\n"); + pinMode(ADB_DATA_PIN, OUTPUT_OPEN_DRAIN); + ADB_WRITE(HIGH); + Keyboard.print("Waiting for ADB high... "); + + while(LOW == ADB_READ()); + Keyboard.print("Ready.\n"); + + Keyboard.print("Resetting... "); + adb_reset(); + delay(500); // A wait for good measure, apparently AEKII can take a moment to reset + Keyboard.print("Ready.\n"); +} + +void print16b(uint16_t buff) { + uint16_t mask = (1 << 15); + for (uint8_t i = 0; i < 16; i++) + { + Keyboard.write(buff & mask ? '1' : '0'); + mask >>= 1; + } +} + +void printkbresp(uint16_t buff) { + //Keyboard.print(" key1 "); + Keyboard.print(buff & (1 << 15) ? "u" : "d"); + Keyboard.print((buff & (0x7F << 8)) >> 8, 16); + //Keyboard.print(" key2 "); + //Keyboard.print(buff & (1 << 7) ? "up \t" : "down\t"); + //Keyboard.print(buff & 0x7F, 16); + Keyboard.print("\n"); +} + +void loop() { + //Keyboard.print("Talk addr 3 reg 0... "); + //noInterrupts(); + uint16_t buffer = 0; + adb_write_command(ADB_CMD_TALK | ADB_ADDRESS(2) | ADB_REGISTER(0)); + adb_wait_tlt(); + bool success = adb_read_data_packet(&buffer, 17); + + //interrupts(); + if (success) { + //print16b(buffer); + printkbresp(buffer); + } + //else + // Keyboard.print("timeout.\n"); + delay(5); +} + +#endif \ No newline at end of file diff --git a/src/raw_keyboard.cpp b/src/raw_keyboard.cpp new file mode 100644 index 0000000..e8f4274 --- /dev/null +++ b/src/raw_keyboard.cpp @@ -0,0 +1,94 @@ +#include +#include "raw_keyboard.h" +#include "keymap.h" + +#if defined(USBCON) +#include "usbd_hid_composite_if.h" + +RawKeyboard::RawKeyboard() { + keyReport = (KeyReport) {0}; +} + +void RawKeyboard::begin(void) +{ + HID_Composite_Init(HID_KEYBOARD); +} + +void RawKeyboard::end(void) +{ + HID_Composite_DeInit(HID_KEYBOARD); +} + +void RawKeyboard::sendReport() +{ + uint8_t buf[8] = {keyReport.modifiers, keyReport.reserved, keyReport.keys[0], + keyReport.keys[1], keyReport.keys[2], keyReport.keys[3], keyReport.keys[4], + keyReport.keys[5] + }; + + HID_Composite_keyboard_sendReport(buf, 8); + + //delay required to prevent persistent key when call print + delay(20); +} + +void RawKeyboard::setKeysFromADBRegister(uint16_t reg) { + if (reg == ADB_KEY_POWER_DOWN) // power button is a special case + { // residing in both octets + updateKeyInReport(KEY_POWER, false); + } + else if (reg == ADB_KEY_POWER_UP) { + updateKeyInReport(KEY_POWER, true); + } + else { + // Higher octet key: + uint8_t key0 = (reg >> 8) & 0x7F; + bool released0 = (reg >> 8) & 0x80; + updateKeyInReport(adb_keycode_to_hid[key0], released0); + + // Lower octet key: + uint8_t key1 = reg & 0x7F; + bool released1 = reg & 0x80; + updateKeyInReport(adb_keycode_to_hid[key1], released1); + } +} + +void RawKeyboard::setModifiersFromADBRegister(uint16_t reg) { + +} + +void RawKeyboard::updateKeyInReport(uint8_t hid_keycode, bool released) { + if (released) + removeKeyFromReport(hid_keycode); + else + addKeyToReport(hid_keycode); +} + +// Returns true if after execution the key is in the report +bool RawKeyboard::addKeyToReport(uint8_t hid_keycode) { + int8_t free_slot = -1; + + for (uint8_t i = 0; i < KEY_REPORT_KEYS_COUNT; i++) { + if (keyReport.keys[i] == hid_keycode) + return true; // key is already in the report + + if (keyReport.keys[i] == 0 && free_slot == -1) + free_slot = i; // memorise empty entry idx + } + + if (free_slot == -1) + return false; // key report is full + + keyReport.keys[free_slot] = hid_keycode; + return true; +} + +void RawKeyboard::removeKeyFromReport(uint8_t hid_keycode) { + for (uint8_t i = 0; i < KEY_REPORT_KEYS_COUNT; i++) { + if (keyReport.keys[i] == hid_keycode) { + keyReport.keys[i] = 0; + } + } +} + +#endif \ No newline at end of file diff --git a/src/raw_keyboard.h b/src/raw_keyboard.h new file mode 100644 index 0000000..ad5c1b7 --- /dev/null +++ b/src/raw_keyboard.h @@ -0,0 +1,38 @@ +#ifndef RAWKEYBOARD_h +#define RAWKEYBOARD_h + +#if !defined(USBCON) || !defined(USBD_USE_HID_COMPOSITE) + +#error "USB HID not enabled! Select 'HID' in the 'Tools->USB interface' menu." + +#else + +#include + +#define KEY_REPORT_KEYS_COUNT 6 + +typedef struct { + uint8_t modifiers; + uint8_t reserved; + uint8_t keys[6]; +} KeyReport; + + +class RawKeyboard { + private: + RawKeyboard(); + KeyReport keyReport; + void updateKeyInReport(uint8_t hid_keycode, bool released); + bool addKeyToReport(uint8_t hid_keycode); + void removeKeyFromReport(uint8_t hid_keycode); + public: + void begin(); + void end(); + void setKeysFromADBRegister(uint16_t); + void setModifiersFromADBRegister(uint16_t); + void sendReport(); +}; + +#endif + +#endif \ No newline at end of file diff --git a/test/README b/test/README new file mode 100644 index 0000000..b94d089 --- /dev/null +++ b/test/README @@ -0,0 +1,11 @@ + +This directory is intended for PlatformIO Unit Testing and project tests. + +Unit Testing is a software testing method by which individual units of +source code, sets of one or more MCU program modules together with associated +control data, usage procedures, and operating procedures, are tested to +determine whether they are fit for use. Unit testing finds problems early +in the development cycle. + +More information about PlatformIO Unit Testing: +- https://docs.platformio.org/page/plus/unit-testing.html diff --git a/test/test_desktop/include/Arduino.h b/test/test_desktop/include/Arduino.h new file mode 100644 index 0000000..8dcc7f9 --- /dev/null +++ b/test/test_desktop/include/Arduino.h @@ -0,0 +1,5 @@ +#include + +void delay(uint16_t) { + +} \ No newline at end of file diff --git a/test/test_desktop/include/Keyboard.h b/test/test_desktop/include/Keyboard.h new file mode 100644 index 0000000..6a1154c --- /dev/null +++ b/test/test_desktop/include/Keyboard.h @@ -0,0 +1,22 @@ +#include +#include + +typedef struct { + uint8_t modifiers; + uint8_t reserved; + uint8_t keys[6]; +} KeyReport; + +class Keyboard_ { + private: + KeyReport _keyReport; + void sendReport(KeyReport *keys) {}; + public: + Keyboard_(void) {}; + void begin(void) {}; + void end(void) {}; + size_t write(uint8_t k) { return 0; }; + size_t press(uint8_t k) { return 0; }; + size_t release(uint8_t k) { return 0; }; + void releaseAll(void) {}; +}; \ No newline at end of file diff --git a/test/test_desktop/include/usbd_hid_composite_if.h b/test/test_desktop/include/usbd_hid_composite_if.h new file mode 100644 index 0000000..e64dc2c --- /dev/null +++ b/test/test_desktop/include/usbd_hid_composite_if.h @@ -0,0 +1,16 @@ +typedef enum { + HID_KEYBOARD, + HID_MOUSE +} HID_Interface; + +void HID_Composite_Init(HID_Interface device) { + +} + +void HID_Composite_DeInit(HID_Interface device) { + +} + +void HID_Composite_keyboard_sendReport(uint8_t *report, uint16_t len) { + +} \ No newline at end of file diff --git a/test/test_desktop/test_raw_keyboard.cpp b/test/test_desktop/test_raw_keyboard.cpp new file mode 100644 index 0000000..1d5da87 --- /dev/null +++ b/test/test_desktop/test_raw_keyboard.cpp @@ -0,0 +1,69 @@ +#define private public +#pragma GCC diagnostic ignored "-Wc++11-extensions" + +#include +#include "raw_keyboard.h" + +// void setUp(void) { +// // set stuff up here +// } + +// void tearDown(void) { +// // clean stuff up here +// } + +void test_keyReport_empty(void) { + RawKeyboard k; + + for (uint8_t i = 0; i < 6; i++) + TEST_ASSERT_EQUAL(0, k.keyReport.keys[i]); + + TEST_ASSERT_EQUAL(0, k.keyReport.reserved); + TEST_ASSERT_EQUAL(0, k.keyReport.modifiers); +} + +void test_addKeyToReport(void) { + RawKeyboard k; + + TEST_ASSERT_TRUE(k.addKeyToReport(1)); + TEST_ASSERT_TRUE(k.addKeyToReport(2)); + TEST_ASSERT_TRUE(k.addKeyToReport(3)); + TEST_ASSERT_TRUE(k.addKeyToReport(2)); + + TEST_ASSERT_EQUAL(1, k.keyReport.keys[0]); + TEST_ASSERT_EQUAL(2, k.keyReport.keys[1]); + TEST_ASSERT_EQUAL(3, k.keyReport.keys[2]); + TEST_ASSERT_EQUAL(0, k.keyReport.keys[3]); + TEST_ASSERT_EQUAL(0, k.keyReport.keys[4]); + TEST_ASSERT_EQUAL(0, k.keyReport.keys[5]); +} + +void test_removeKeyFromReport(void) { + RawKeyboard k; + + uint8_t initial_keys[] = {7, 8, 9, 0, 0, 0}; + for (uint8_t i = 0; i < 6; i++) { + k.keyReport.keys[i] = initial_keys[i]; + } + + k.removeKeyFromReport(7); + k.removeKeyFromReport(9); + k.removeKeyFromReport(7); + + TEST_ASSERT_EQUAL(0, k.keyReport.keys[0]); + TEST_ASSERT_EQUAL(8, k.keyReport.keys[1]); + TEST_ASSERT_EQUAL(0, k.keyReport.keys[2]); + TEST_ASSERT_EQUAL(0, k.keyReport.keys[3]); + TEST_ASSERT_EQUAL(0, k.keyReport.keys[4]); + TEST_ASSERT_EQUAL(0, k.keyReport.keys[5]); +} + +int main(int argc, char **argv) { + UNITY_BEGIN(); + RUN_TEST(test_keyReport_empty); + RUN_TEST(test_addKeyToReport); + RUN_TEST(test_removeKeyFromReport); + UNITY_END(); + + return 0; +}