Add SAMD21 and SAMD51 support for CircuitPython.
The ProtoThreads style subtasks were removed because it led to extremely unclear control flow. RTOSes can be used if threading is needed. Also added some additional functionality to MSC to support dynamic LUNs and read-only LUNs.
This commit is contained in:
Scott Shawcroft
341
src/portable/microchip/samd21/dcd.c
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341
src/portable/microchip/samd21/dcd.c
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/**************************************************************************/
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/*!
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@file dcd_nrf5x.c
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@author hathach
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@section LICENSE
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Software License Agreement (BSD License)
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Copyright (c) 2018, Scott Shawcroft for Adafruit Industries
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All rights reserved.
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Redistribution and use in source and binary forms, with or without
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modification, are permitted provided that the following conditions are met:
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1. Redistributions of source code must retain the above copyright
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notice, this list of conditions and the following disclaimer.
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2. Redistributions in binary form must reproduce the above copyright
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notice, this list of conditions and the following disclaimer in the
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documentation and/or other materials provided with the distribution.
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3. Neither the name of the copyright holders nor the
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names of its contributors may be used to endorse or promote products
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derived from this software without specific prior written permission.
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THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS ''AS IS'' AND ANY
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EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER BE LIABLE FOR ANY
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DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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(INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
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ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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This file is part of the tinyusb stack.
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*/
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/**************************************************************************/
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#include "tusb_option.h"
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#if TUSB_OPT_DEVICE_ENABLED && CFG_TUSB_MCU == OPT_MCU_SAMD51
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#include "device/dcd.h"
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#include "device/usbd.h"
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#include "device/usbd_pvt.h" // to use defer function helper
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#include "class/msc/msc_device.h"
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#include "sam.h"
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/*------------------------------------------------------------------*/
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/* MACRO TYPEDEF CONSTANT ENUM
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*------------------------------------------------------------------*/
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enum
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{
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// Max allowed by USB specs
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MAX_PACKET_SIZE = 64,
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};
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UsbDeviceDescBank sram_registers[8][2];
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ATTR_ALIGNED(4) uint8_t control_out_buffer[64];
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ATTR_ALIGNED(4) uint8_t control_in_buffer[64];
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volatile uint32_t setup_count = 0;
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// Setup the control endpoint 0.
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static void bus_reset(void) {
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// Max size of packets is 64 bytes.
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UsbDeviceDescBank* bank_out = &sram_registers[0][TUSB_DIR_OUT];
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bank_out->PCKSIZE.bit.SIZE = 0x3;
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UsbDeviceDescBank* bank_in = &sram_registers[0][TUSB_DIR_IN];
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bank_in->PCKSIZE.bit.SIZE = 0x3;
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UsbDeviceEndpoint* ep = &USB->DEVICE.DeviceEndpoint[0];
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ep->EPCFG.reg = USB_DEVICE_EPCFG_EPTYPE0(0x1) | USB_DEVICE_EPCFG_EPTYPE1(0x1);
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ep->EPINTENSET.reg = USB_DEVICE_EPINTENSET_TRCPT0 | USB_DEVICE_EPINTENSET_TRCPT1 | USB_DEVICE_EPINTENSET_RXSTP;
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dcd_edpt_xfer(0, 0, control_out_buffer, 64);
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setup_count = 0;
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}
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/*------------------------------------------------------------------*/
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/* Controller API
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*------------------------------------------------------------------*/
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bool dcd_init (uint8_t rhport)
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{
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(void) rhport;
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USB->DEVICE.DESCADD.reg = (uint32_t) &sram_registers;
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USB->DEVICE.CTRLB.reg = USB_DEVICE_CTRLB_SPDCONF_FS;
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USB->DEVICE.CTRLA.reg = USB_CTRLA_MODE_DEVICE | USB_CTRLA_ENABLE;
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USB->DEVICE.INTENSET.reg = USB_DEVICE_INTENSET_SOF | USB_DEVICE_INTENSET_EORST;
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return true;
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}
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void dcd_connect (uint8_t rhport)
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{
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}
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void dcd_disconnect (uint8_t rhport)
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{
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}
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void dcd_set_address (uint8_t rhport, uint8_t dev_addr)
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{
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(void) rhport;
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dcd_edpt_xfer (0, TUSB_DIR_IN_MASK, NULL, 0);
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// Wait for EP0 to finish before switching the address.
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while (USB->DEVICE.DeviceEndpoint[0].EPSTATUS.bit.BK1RDY == 1) {}
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USB->DEVICE.DADD.reg = USB_DEVICE_DADD_DADD(dev_addr) | USB_DEVICE_DADD_ADDEN;
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}
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void dcd_set_config (uint8_t rhport, uint8_t config_num)
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{
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(void) rhport;
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(void) config_num;
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// Nothing to do
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}
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/*------------------------------------------------------------------*/
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/* Control
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*------------------------------------------------------------------*/
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bool dcd_control_xfer (uint8_t rhport, uint8_t dir, uint8_t * buffer, uint16_t length)
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{
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(void) rhport;
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uint8_t ep_addr = 0;
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if (dir == TUSB_DIR_IN) {
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ep_addr |= TUSB_DIR_IN_MASK;
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}
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return dcd_edpt_xfer (rhport, ep_addr, buffer, length);
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}
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bool dcd_edpt_open (uint8_t rhport, tusb_desc_endpoint_t const * desc_edpt)
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{
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(void) rhport;
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uint8_t const epnum = edpt_number(desc_edpt->bEndpointAddress);
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uint8_t const dir = edpt_dir(desc_edpt->bEndpointAddress);
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UsbDeviceDescBank* bank = &sram_registers[epnum][dir];
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uint32_t size_value = 0;
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while (size_value < 7) {
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if (1 << (size_value + 3) == desc_edpt->wMaxPacketSize.size) {
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break;
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}
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size_value++;
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}
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bank->PCKSIZE.bit.SIZE = size_value;
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UsbDeviceEndpoint* ep = &USB->DEVICE.DeviceEndpoint[epnum];
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if ( dir == TUSB_DIR_OUT )
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{
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ep->EPCFG.bit.EPTYPE0 = desc_edpt->bmAttributes.xfer + 1;
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ep->EPINTENSET.bit.TRCPT0 = true;
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}else
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{
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ep->EPCFG.bit.EPTYPE1 = desc_edpt->bmAttributes.xfer + 1;
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ep->EPINTENSET.bit.TRCPT1 = true;
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}
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__ISB(); __DSB();
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return true;
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}
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bool dcd_edpt_xfer (uint8_t rhport, uint8_t ep_addr, uint8_t * buffer, uint16_t total_bytes)
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{
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(void) rhport;
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uint8_t const epnum = edpt_number(ep_addr);
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uint8_t const dir = edpt_dir(ep_addr);
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UsbDeviceDescBank* bank = &sram_registers[epnum][dir];
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UsbDeviceEndpoint* ep = &USB->DEVICE.DeviceEndpoint[epnum];
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bank->ADDR.reg = (uint32_t) buffer;
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if ( dir == TUSB_DIR_OUT )
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{
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bank->PCKSIZE.bit.MULTI_PACKET_SIZE = total_bytes;
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bank->PCKSIZE.bit.BYTE_COUNT = 0;
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ep->EPSTATUSCLR.reg |= USB_DEVICE_EPSTATUSCLR_BK0RDY;
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ep->EPINTFLAG.reg |= USB_DEVICE_EPINTFLAG_TRFAIL0;
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} else
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{
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bank->PCKSIZE.bit.MULTI_PACKET_SIZE = 0;
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bank->PCKSIZE.bit.BYTE_COUNT = total_bytes;
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// bank->PCKSIZE.bit.AUTO_ZLP = 1;
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ep->EPSTATUSSET.reg |= USB_DEVICE_EPSTATUSSET_BK1RDY;
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ep->EPINTFLAG.reg |= USB_DEVICE_EPINTFLAG_TRFAIL1;
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}
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return true;
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}
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bool dcd_edpt_stalled (uint8_t rhport, uint8_t ep_addr)
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{
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(void) rhport;
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// control is never got halted
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if ( ep_addr == 0 ) {
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return false;
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}
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uint8_t const epnum = edpt_number(ep_addr);
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UsbDeviceEndpoint* ep = &USB->DEVICE.DeviceEndpoint[epnum];
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return (edpt_dir(ep_addr) == TUSB_DIR_IN ) ? ep->EPINTFLAG.bit.STALL1 : ep->EPINTFLAG.bit.STALL0;
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}
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void dcd_edpt_stall (uint8_t rhport, uint8_t ep_addr)
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{
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(void) rhport;
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uint8_t const epnum = edpt_number(ep_addr);
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UsbDeviceEndpoint* ep = &USB->DEVICE.DeviceEndpoint[epnum];
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if (edpt_dir(ep_addr) == TUSB_DIR_IN) {
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ep->EPSTATUSSET.reg = USB_DEVICE_EPSTATUSSET_STALLRQ1;
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} else {
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ep->EPSTATUSSET.reg = USB_DEVICE_EPSTATUSSET_STALLRQ0;
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}
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__ISB(); __DSB();
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}
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void dcd_edpt_clear_stall (uint8_t rhport, uint8_t ep_addr)
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{
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(void) rhport;
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uint8_t const epnum = edpt_number(ep_addr);
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UsbDeviceEndpoint* ep = &USB->DEVICE.DeviceEndpoint[epnum];
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if (edpt_dir(ep_addr) == TUSB_DIR_IN) {
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ep->EPSTATUSCLR.reg = USB_DEVICE_EPSTATUSCLR_STALLRQ1;
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} else {
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ep->EPSTATUSCLR.reg = USB_DEVICE_EPSTATUSCLR_STALLRQ0;
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}
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}
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bool dcd_edpt_busy (uint8_t rhport, uint8_t ep_addr)
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{
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(void) rhport;
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// USBD shouldn't check control endpoint state
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if ( 0 == ep_addr ) return false;
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uint8_t const epnum = edpt_number(ep_addr);
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UsbDeviceEndpoint* ep = &USB->DEVICE.DeviceEndpoint[epnum];
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if (edpt_dir(ep_addr) == TUSB_DIR_IN) {
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return ep->EPINTFLAG.bit.TRCPT1 == 0 && ep->EPSTATUS.bit.BK1RDY == 1;
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}
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return ep->EPINTFLAG.bit.TRCPT0 == 0 && ep->EPSTATUS.bit.BK0RDY == 1;
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}
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/*------------------------------------------------------------------*/
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static bool maybe_handle_setup_packet(void) {
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if (USB->DEVICE.DeviceEndpoint[0].EPINTFLAG.bit.RXSTP)
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{
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USB->DEVICE.DeviceEndpoint[0].EPINTFLAG.reg = USB_DEVICE_EPINTFLAG_RXSTP;
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// This copies the data elsewhere so we can reuse the buffer.
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dcd_event_setup_received(0, (uint8_t*) sram_registers[0][0].ADDR.reg, true);
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dcd_edpt_xfer(0, 0, control_out_buffer, 64);
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setup_count += 1;
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return true;
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}
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return false;
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}
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void maybe_transfer_complete(void) {
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uint32_t epints = USB->DEVICE.EPINTSMRY.reg;
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for (uint8_t epnum = 0; epnum < USB_EPT_NUM; epnum++) {
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if ((epints & (1 << epnum)) == 0) {
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continue;
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}
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if (maybe_handle_setup_packet()) {
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continue;
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}
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UsbDeviceEndpoint* ep = &USB->DEVICE.DeviceEndpoint[epnum];
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uint32_t epintflag = ep->EPINTFLAG.reg;
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// Handle IN completions
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if ((epintflag & USB_DEVICE_EPINTFLAG_TRCPT1) != 0) {
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ep->EPINTFLAG.reg = USB_DEVICE_EPINTFLAG_TRCPT1;
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UsbDeviceDescBank* bank = &sram_registers[epnum][TUSB_DIR_IN];
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uint16_t total_transfer_size = bank->PCKSIZE.bit.BYTE_COUNT;
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uint8_t ep_addr = epnum | TUSB_DIR_IN_MASK;
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dcd_event_xfer_complete(0, ep_addr, total_transfer_size, DCD_XFER_SUCCESS, true);
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}
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// Handle OUT completions
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if ((epintflag & USB_DEVICE_EPINTFLAG_TRCPT0) != 0) {
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ep->EPINTFLAG.reg = USB_DEVICE_EPINTFLAG_TRCPT0;
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UsbDeviceDescBank* bank = &sram_registers[epnum][TUSB_DIR_OUT];
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uint16_t total_transfer_size = bank->PCKSIZE.bit.BYTE_COUNT;
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uint8_t ep_addr = epnum;
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dcd_event_xfer_complete(0, ep_addr, total_transfer_size, DCD_XFER_SUCCESS, true);
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if (epnum == 0) {
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dcd_edpt_xfer(0, 0, control_out_buffer, 64);
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}
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}
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}
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}
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void USB_Handler(void) {
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uint32_t int_status = USB->DEVICE.INTFLAG.reg;
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/*------------- Interrupt Processing -------------*/
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if ( int_status & USB_DEVICE_INTFLAG_EORST )
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{
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USB->DEVICE.INTFLAG.reg = USB_DEVICE_INTENCLR_EORST;
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bus_reset();
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dcd_event_bus_signal(0, DCD_EVENT_BUS_RESET, true);
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}
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if ( int_status & USB_DEVICE_INTFLAG_SOF )
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{
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USB->DEVICE.INTFLAG.reg = USB_DEVICE_INTFLAG_SOF;
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dcd_event_bus_signal(0, DCD_EVENT_SOF, true);
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}
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// Setup packet received.
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maybe_handle_setup_packet();
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// Handle complete transfer
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maybe_transfer_complete();
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}
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#endif
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