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126 | -------------------------------------------------------------------------------
-- --
-- STM32F0 USB --
-- --
-- Copyright (C) 2022 Marc Poulhiès --
-- --
-- STM32F0 USB is free software: you can redistribute it and/or --
-- modify it under the terms of the GNU General Public License as --
-- published by the Free Software Foundation, either version 3 of the --
-- License, or (at your option) any later version. --
-- --
-- STM32F0 USB is distributed in the hope that it will be useful, --
-- but WITHOUT ANY WARRANTY; without even the implied warranty of --
-- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU --
-- General Public License for more details. --
-- --
-- You should have received a copy of the GNU General Public License --
-- along with STM32F0 USB. If not, see <http://www.gnu.org/licenses/>. --
-- --
-------------------------------------------------------------------------------
--
-- SPDX-License-Identifier: GPL-3.0-or-later
with System.Storage_Elements;
with System;
with USB; use USB;
with USB.HAL.Device; use USB.HAL.Device;
with USB.Utils;
package STM32.USB_Device is
Num_Endpoints : constant := 8;
type UDC is new USB_Device_Controller with private;
overriding procedure Initialize (This : in out UDC);
overriding function Request_Buffer
(This : in out UDC; Ep : EP_Addr; Len : USB.Packet_Size)
return System.Address;
overriding function Valid_EP_Id
(This : in out UDC; EP : EP_Id) return Boolean is
(Positive (EP) in 0 .. Num_Endpoints - 1);
overriding procedure Start (This : in out UDC);
overriding procedure Reset (This : in out UDC);
overriding function Poll (This : in out UDC) return UDC_Event;
overriding procedure EP_Send_Packet
(This : in out UDC; Ep : EP_Id; Len : USB.Packet_Size);
overriding procedure EP_Setup
(This : in out UDC; EP : EP_Addr; Typ : EP_Type);
overriding procedure EP_Ready_For_Data
(This : in out UDC; EP : EP_Id; Size : USB.Packet_Size;
Ready : Boolean := True);
overriding procedure EP_Stall
(This : in out UDC; EP : EP_Addr; Set : Boolean := True);
overriding procedure Set_Address (This : in out UDC; Addr : UInt7);
overriding function Early_Address (This : UDC) return Boolean is (False);
function Send_Would_Block (This : UDC; Ep : EP_Id) return Boolean;
private
Packet_Buffer_Base : constant System.Address :=
System'To_Address (16#4000_6000#);
subtype Packet_Buffer_Offset is
System.Storage_Elements.Storage_Offset range 16#000# .. 16#3FF#;
function Allocate_Buffer
(This : in out UDC; Size : Natural) return Packet_Buffer_Offset;
type Endpoint_Status is record
-- Following pointers points in the packet memory.
-- The memory is accessible by the CPU, but with particular constraints.
-- Instead of enforcing constraints everywhere, we copy back and forth
-- between the packet memory and RAM.
Tx_Buffer_Offset : Packet_Buffer_Offset := Packet_Buffer_Offset'Last;
Rx_Buffer_Offset : Packet_Buffer_Offset := Packet_Buffer_Offset'Last;
Rx_Use_32b : Boolean := False;
Rx_Num_Blocks : Natural := 0;
-- Rx_Buffer_Address : System.Address := System.Null_Address;
-- RX buffer in Packet memory
-- Both folowing pointers points in regular memory: CPU can access it,
-- no particular constraint.
Tx_User_Buffer_Address : System.Address := System.Null_Address;
-- Buffer where user writes data to be sent
Tx_User_Buffer_Len : USB.Packet_Size := 0;
Rx_User_Buffer_Address : System.Address := System.Null_Address;
-- Buffer where user expects received data to be stored
Rx_User_Buffer_Len : USB.Packet_Size := 0;
Typ : EP_Type := Bulk;
Valid : Boolean := False;
end record;
type Endpoint_Status_Array is array (USB.EP_Id) of Endpoint_Status;
type UDC is new USB_Device_Controller with record
Alloc : Standard.USB.Utils.Basic_RAM_Allocator (64 * 4);
-- 4 x 16-bits per AP (ADDR_TX + COUNT_TX + ADDR_RX + COUNT_RX) = 64-bits
-- (8 bytes)
-- x 8 endpoints
-- = 64 bytes for BTABLE
-- + 128 bytes statically reserved for EP0 buffers. Maybe too much. 64 bytes is the minimum for USB FS control.
Next_Buffer : Packet_Buffer_Offset :=
System.Storage_Elements.Storage_Offset (Num_Endpoints * 8 + 128);
EP_Status : Endpoint_Status_Array := [others => <>];
In_Reset : Boolean := True;
end record;
end STM32.USB_Device;
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