Adding dynamic USB power support
- Each scan module now has a current change callback which passes the available current as a parameter - No longer attempts to use the max 500 mA immediately, starts with 100 mA then goes to 500 mA after enumeration - If enumeration fails due to bMaxPower of 500 mA, then attempt again at 100 mA (might also be possible to go even lower to 20 mA in certain cases) - Now working with the Apple Ipad (no over-power messages) - Fixed Wake-up behaviour on Apple Ipad (and likely other iOS devices) - More effecient set_feature/clear_feature handling (device handler) - Initial power handling via Interconnect (still needs work to get it more dynamic)
This commit is contained in:
Jacob Alexander
parent
62ba0c558b
commit
aaae9bc0f2
29 changed files with 503 additions and 48 deletions
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@ -1,7 +1,7 @@
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/* Teensyduino Core Library
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* http://www.pjrc.com/teensy/
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* Copyright (c) 2013 PJRC.COM, LLC.
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* Modifications by Jacob Alexander (2013-2015)
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* Modifications by Jacob Alexander (2013-2016)
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*
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* Permission is hereby granted, free of charge, to any person obtaining
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* a copy of this software and associated documentation files (the
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@ -168,6 +168,9 @@ volatile uint8_t usb_reboot_timer = 0;
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static uint8_t reply_buffer[8];
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static uint8_t power_neg_delay;
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static uint32_t power_neg_time;
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// ----- Functions -----
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@ -188,6 +191,34 @@ static void endpoint0_transmit( const void *data, uint32_t len )
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ep0_tx_bdt_bank ^= 1;
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}
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// Used to check any USB state changes that may not have a proper interrupt
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// Called once per scan loop, should take minimal processing time or it may affect other modules
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void usb_device_check()
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{
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// Check to see if we're still waiting for the next USB request after Get Configuration Descriptor
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// If still waiting, restart the USB initialization with a lower power requirement
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if ( power_neg_delay )
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{
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// Check if 100 ms has elapsed
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if ( systick_millis_count - power_neg_time > 100 )
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{
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// Update bMaxPower
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// The value set is in increments of 2 mA
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// So 50 * 2 mA = 100 mA
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// XXX Currently only transitions to 100 mA
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// It may be possible to transition down again to 20 mA
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*usb_bMaxPower = 50;
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// Re-initialize USB
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power_neg_delay = 0;
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usb_configuration = 0; // Clear USB configuration if we have one
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USB0_CONTROL = 0; // Disable D+ Pullup to simulate disconnect
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delay(10); // Delay is necessary to simulate disconnect
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usb_init();
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}
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}
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}
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static void usb_setup()
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{
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const uint8_t *data = NULL;
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@ -199,6 +230,13 @@ static void usb_setup()
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const uint8_t *cfg;
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int i;
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// If another request is made, disable the power negotiation check
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// See GET_DESCRIPTOR - Configuration
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if ( power_neg_delay )
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{
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power_neg_delay = 0;
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}
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switch ( setup.wRequestAndType )
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{
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case 0x0500: // SET_ADDRESS
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@ -212,6 +250,10 @@ static void usb_setup()
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Output_Available = usb_configuration;
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reg = &USB0_ENDPT1;
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cfg = usb_endpoint_config_table;
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// Now configured so we can utilize bMaxPower now
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Output_update_usb_current( *usb_bMaxPower * 2 );
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// clear all BDT entries, free any allocated memory...
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for ( i = 4; i < ( NUM_ENDPOINTS + 1) * 4; i++ )
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{
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@ -324,9 +366,27 @@ static void usb_setup()
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goto send;
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case 0x0100: // CLEAR_FEATURE (device)
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switch ( setup.wValue )
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{
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// CLEAR_FEATURE(DEVICE_REMOTE_WAKEUP)
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// See SET_FEATURE(DEVICE_REMOTE_WAKEUP) for details
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case 0x1:
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goto send;
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}
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warn_msg("SET_FEATURE - Device wValue(");
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printHex( setup.wValue );
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print( ")" NL );
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endpoint0_stall();
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return;
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case 0x0101: // CLEAR_FEATURE (interface)
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// TODO: Currently ignoring, perhaps useful? -HaaTa
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warn_print("CLEAR_FEATURE - Device/Interface");
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warn_msg("CLEAR_FEATURE - Interface wValue(");
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printHex( setup.wValue );
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print(") wIndex(");
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printHex( setup.wIndex );
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print( ")" NL );
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endpoint0_stall();
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return;
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@ -342,9 +402,30 @@ static void usb_setup()
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goto send;
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case 0x0300: // SET_FEATURE (device)
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switch ( setup.wValue )
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{
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// SET_FEATURE(DEVICE_REMOTE_WAKEUP)
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// XXX: Only used to confirm Remote Wake
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// Used on Mac OSX and Windows not on Linux
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// Good post on the behaviour:
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// http://community.silabs.com/t5/8-bit-MCU/Remote-wakeup-HID/m-p/74957#M30802
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case 0x1:
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goto send;
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}
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warn_msg("SET_FEATURE - Device wValue(");
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printHex( setup.wValue );
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print( ")" NL );
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endpoint0_stall();
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return;
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case 0x0301: // SET_FEATURE (interface)
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// TODO: Currently ignoring, perhaps useful? -HaaTa
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warn_print("SET_FEATURE - Device/Interface");
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warn_msg("SET_FEATURE - Interface wValue(");
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printHex( setup.wValue );
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print(") wIndex(");
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printHex( setup.wIndex );
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print( ")" NL );
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endpoint0_stall();
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return;
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@ -385,6 +466,27 @@ static void usb_setup()
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{
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datalen = list->length;
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}
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// XXX Power negotiation hack -HaaTa
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// Some devices such as the Apple Ipad do not support bMaxPower greater than 100 mA
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// However, there is no provision in the basic USB 2.0 stack for power negotiation
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// To get around this:
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// * Attempt to set bMaxPower to 500 mA first
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// * If more than 100 ms passes since retrieving a Get Configuration Descriptor
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// (Descriptor with bMaxPower in it)
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// * Change usb_bMaxPower to 50 (100 mA)
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// * Restart the USB init process
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// According to notes online, it says that some Apple devices can only do 20 mA
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// However, in my testing this hasn't been the case
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// (you can also draw as much current as you want if you just lie in the descriptor :P)
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// If this becomes an issue we can use this hack a second time to negotiate down to 20 mA
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// (which should be fine for just the mcu)
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if ( setup.wValue == 0x0200 && setup.wIndex == 0x0 )
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{
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power_neg_delay = 1;
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power_neg_time = systick_millis_count;
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}
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#if UART_DEBUG
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print("Desc found, ");
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printHex32( (uint32_t)data );
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@ -862,6 +964,11 @@ void usb_rx_memory( usb_packet_t *packet )
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void usb_tx( uint32_t endpoint, usb_packet_t *packet )
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{
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// Since we are transmitting data, USB will be brought out of sleep/suspend
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// if it's in that state
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// Use the currently set descriptor value
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Output_update_usb_current( *usb_bMaxPower * 2 );
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bdt_t *b = &table[ index( endpoint, TX, EVEN ) ];
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uint8_t next;
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@ -1161,9 +1268,12 @@ restart:
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USB0_ISTAT = USB_ISTAT_ERROR;
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}
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// USB Host signalling device to enter 'sleep' state
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// The USB Module triggers this interrupt when it detects the bus has been idle for 3 ms
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if ( (status & USB_ISTAT_SLEEP /* 10 */ ) )
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{
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//serial_print("sleep\n");
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info_print("Host has requested USB sleep/suspend state");
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Output_update_usb_current( 100 ); // Set to 100 mA
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USB0_ISTAT = USB_ISTAT_SLEEP;
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}
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}
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@ -1223,6 +1333,9 @@ uint8_t usb_init()
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// enable d+ pullup
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USB0_CONTROL = USB_CONTROL_DPPULLUPNONOTG;
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// Do not check for power negotiation delay until Get Configuration Descriptor
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power_neg_delay = 0;
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return 1;
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}
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