diff options
Diffstat (limited to 'tinyusb/src/portable/microchip/samd/dcd_samd.c')
| -rwxr-xr-x | tinyusb/src/portable/microchip/samd/dcd_samd.c | 411 |
1 files changed, 411 insertions, 0 deletions
diff --git a/tinyusb/src/portable/microchip/samd/dcd_samd.c b/tinyusb/src/portable/microchip/samd/dcd_samd.c new file mode 100755 index 00000000..577bd0e0 --- /dev/null +++ b/tinyusb/src/portable/microchip/samd/dcd_samd.c @@ -0,0 +1,411 @@ +/* + * The MIT License (MIT) + * + * Copyright (c) 2018 Scott Shawcroft for Adafruit Industries + * + * Permission is hereby granted, free of charge, to any person obtaining a copy + * of this software and associated documentation files (the "Software"), to deal + * in the Software without restriction, including without limitation the rights + * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell + * copies of the Software, and to permit persons to whom the Software is + * furnished to do so, subject to the following conditions: + * + * The above copyright notice and this permission notice shall be included in + * all copies or substantial portions of the Software. + * + * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR + * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, + * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE + * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER + * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, + * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN + * THE SOFTWARE. + * + * This file is part of the TinyUSB stack. + */ + +#include "tusb_option.h" + +#if TUSB_OPT_DEVICE_ENABLED && \ + (CFG_TUSB_MCU == OPT_MCU_SAMD11 || CFG_TUSB_MCU == OPT_MCU_SAMD21 || \ + CFG_TUSB_MCU == OPT_MCU_SAMD51 || CFG_TUSB_MCU == OPT_MCU_SAME5X || \ + CFG_TUSB_MCU == OPT_MCU_SAML22 || CFG_TUSB_MCU == OPT_MCU_SAML21) + +#include "sam.h" +#include "device/dcd.h" + +/*------------------------------------------------------------------*/ +/* MACRO TYPEDEF CONSTANT ENUM + *------------------------------------------------------------------*/ +static TU_ATTR_ALIGNED(4) UsbDeviceDescBank sram_registers[8][2]; + +// Setup packet is only 8 bytes in length. However under certain scenario, +// USB DMA controller may decide to overwrite/overflow the buffer with +// 2 extra bytes of CRC. From datasheet's "Management of SETUP Transactions" section +// If the number of received data bytes is the maximum data payload specified by +// PCKSIZE.SIZE minus one, only the first CRC data is written to the data buffer. +// If the number of received data is equal or less than the data payload specified +// by PCKSIZE.SIZE minus two, both CRC data bytes are written to the data buffer. +// Therefore we will need to increase it to 10 bytes here. +static TU_ATTR_ALIGNED(4) uint8_t _setup_packet[8+2]; + +// ready for receiving SETUP packet +static inline void prepare_setup(void) +{ + // Only make sure the EP0 OUT buffer is ready + sram_registers[0][0].ADDR.reg = (uint32_t) _setup_packet; + sram_registers[0][0].PCKSIZE.bit.MULTI_PACKET_SIZE = sizeof(tusb_control_request_t); + sram_registers[0][0].PCKSIZE.bit.BYTE_COUNT = 0; +} + +// Setup the control endpoint 0. +static void bus_reset(void) +{ + // Max size of packets is 64 bytes. + UsbDeviceDescBank* bank_out = &sram_registers[0][TUSB_DIR_OUT]; + bank_out->PCKSIZE.bit.SIZE = 0x3; + UsbDeviceDescBank* bank_in = &sram_registers[0][TUSB_DIR_IN]; + bank_in->PCKSIZE.bit.SIZE = 0x3; + + UsbDeviceEndpoint* ep = &USB->DEVICE.DeviceEndpoint[0]; + ep->EPCFG.reg = USB_DEVICE_EPCFG_EPTYPE0(0x1) | USB_DEVICE_EPCFG_EPTYPE1(0x1); + ep->EPINTENSET.reg = USB_DEVICE_EPINTENSET_TRCPT0 | USB_DEVICE_EPINTENSET_TRCPT1 | USB_DEVICE_EPINTENSET_RXSTP; + + // Prepare for setup packet + prepare_setup(); +} + +/*------------------------------------------------------------------*/ +/* Controller API + *------------------------------------------------------------------*/ +void dcd_init (uint8_t rhport) +{ + (void) rhport; + + // Reset to get in a clean state. + USB->DEVICE.CTRLA.bit.SWRST = true; + while (USB->DEVICE.SYNCBUSY.bit.SWRST == 0) {} + while (USB->DEVICE.SYNCBUSY.bit.SWRST == 1) {} + + USB->DEVICE.PADCAL.bit.TRANSP = (*((uint32_t*) USB_FUSES_TRANSP_ADDR) & USB_FUSES_TRANSP_Msk) >> USB_FUSES_TRANSP_Pos; + USB->DEVICE.PADCAL.bit.TRANSN = (*((uint32_t*) USB_FUSES_TRANSN_ADDR) & USB_FUSES_TRANSN_Msk) >> USB_FUSES_TRANSN_Pos; + USB->DEVICE.PADCAL.bit.TRIM = (*((uint32_t*) USB_FUSES_TRIM_ADDR) & USB_FUSES_TRIM_Msk) >> USB_FUSES_TRIM_Pos; + + USB->DEVICE.QOSCTRL.bit.CQOS = 3; // High Quality + USB->DEVICE.QOSCTRL.bit.DQOS = 3; // High Quality + + // Configure registers + USB->DEVICE.DESCADD.reg = (uint32_t) &sram_registers; + USB->DEVICE.CTRLB.reg = USB_DEVICE_CTRLB_SPDCONF_FS; + USB->DEVICE.CTRLA.reg = USB_CTRLA_MODE_DEVICE | USB_CTRLA_ENABLE | USB_CTRLA_RUNSTDBY; + while (USB->DEVICE.SYNCBUSY.bit.ENABLE == 1) {} + + USB->DEVICE.INTFLAG.reg |= USB->DEVICE.INTFLAG.reg; // clear pending + USB->DEVICE.INTENSET.reg = /* USB_DEVICE_INTENSET_SOF | */ USB_DEVICE_INTENSET_EORST; +} + +#if CFG_TUSB_MCU == OPT_MCU_SAMD51 || CFG_TUSB_MCU == OPT_MCU_SAME5X + +void dcd_int_enable(uint8_t rhport) +{ + (void) rhport; + NVIC_EnableIRQ(USB_0_IRQn); + NVIC_EnableIRQ(USB_1_IRQn); + NVIC_EnableIRQ(USB_2_IRQn); + NVIC_EnableIRQ(USB_3_IRQn); +} + +void dcd_int_disable(uint8_t rhport) +{ + (void) rhport; + NVIC_DisableIRQ(USB_3_IRQn); + NVIC_DisableIRQ(USB_2_IRQn); + NVIC_DisableIRQ(USB_1_IRQn); + NVIC_DisableIRQ(USB_0_IRQn); +} + +#elif CFG_TUSB_MCU == OPT_MCU_SAMD11 || CFG_TUSB_MCU == OPT_MCU_SAMD21 || \ + CFG_TUSB_MCU == OPT_MCU_SAML22 || CFG_TUSB_MCU == OPT_MCU_SAML21 + +void dcd_int_enable(uint8_t rhport) +{ + (void) rhport; + NVIC_EnableIRQ(USB_IRQn); +} + +void dcd_int_disable(uint8_t rhport) +{ + (void) rhport; + NVIC_DisableIRQ(USB_IRQn); +} + +#else + +#error "No implementation available for dcd_int_enable / dcd_int_disable" + +#endif + +void dcd_set_address (uint8_t rhport, uint8_t dev_addr) +{ + (void) dev_addr; + + // Response with zlp status + dcd_edpt_xfer(rhport, 0x80, NULL, 0); + + // DCD can only set address after status for this request is complete + // do it at dcd_edpt0_status_complete() + + // Enable SUSPEND interrupt since the bus signal D+/D- are stable now. + USB->DEVICE.INTFLAG.reg = USB_DEVICE_INTENCLR_SUSPEND; // clear pending + USB->DEVICE.INTENSET.reg = USB_DEVICE_INTENSET_SUSPEND; +} + +void dcd_remote_wakeup(uint8_t rhport) +{ + (void) rhport; + USB->DEVICE.CTRLB.bit.UPRSM = 1; +} + +// disconnect by disabling internal pull-up resistor on D+/D- +void dcd_disconnect(uint8_t rhport) +{ + (void) rhport; + USB->DEVICE.CTRLB.reg |= USB_DEVICE_CTRLB_DETACH; +} + +// connect by enabling internal pull-up resistor on D+/D- +void dcd_connect(uint8_t rhport) +{ + (void) rhport; + USB->DEVICE.CTRLB.reg &= ~USB_DEVICE_CTRLB_DETACH; +} + +/*------------------------------------------------------------------*/ +/* DCD Endpoint port + *------------------------------------------------------------------*/ + +// Invoked when a control transfer's status stage is complete. +// May help DCD to prepare for next control transfer, this API is optional. +void dcd_edpt0_status_complete(uint8_t rhport, tusb_control_request_t const * request) +{ + (void) rhport; + + if (request->bmRequestType_bit.recipient == TUSB_REQ_RCPT_DEVICE && + request->bmRequestType_bit.type == TUSB_REQ_TYPE_STANDARD && + request->bRequest == TUSB_REQ_SET_ADDRESS ) + { + uint8_t const dev_addr = (uint8_t) request->wValue; + USB->DEVICE.DADD.reg = USB_DEVICE_DADD_DADD(dev_addr) | USB_DEVICE_DADD_ADDEN; + } + + // Just finished status stage, prepare for next setup packet + // Note: we may already prepare setup when queueing the control status. + // but it has no harm to do it again here + prepare_setup(); +} + +bool dcd_edpt_open (uint8_t rhport, tusb_desc_endpoint_t const * desc_edpt) +{ + (void) rhport; + + uint8_t const epnum = tu_edpt_number(desc_edpt->bEndpointAddress); + uint8_t const dir = tu_edpt_dir(desc_edpt->bEndpointAddress); + + UsbDeviceDescBank* bank = &sram_registers[epnum][dir]; + uint32_t size_value = 0; + while (size_value < 7) { + if (1 << (size_value + 3) == desc_edpt->wMaxPacketSize.size) { + break; + } + size_value++; + } + + // unsupported endpoint size + if ( size_value == 7 && desc_edpt->wMaxPacketSize.size != 1023 ) return false; + + bank->PCKSIZE.bit.SIZE = size_value; + + UsbDeviceEndpoint* ep = &USB->DEVICE.DeviceEndpoint[epnum]; + + if ( dir == TUSB_DIR_OUT ) + { + ep->EPCFG.bit.EPTYPE0 = desc_edpt->bmAttributes.xfer + 1; + ep->EPINTENSET.bit.TRCPT0 = true; + }else + { + ep->EPCFG.bit.EPTYPE1 = desc_edpt->bmAttributes.xfer + 1; + ep->EPINTENSET.bit.TRCPT1 = true; + } + + return true; +} + +bool dcd_edpt_xfer (uint8_t rhport, uint8_t ep_addr, uint8_t * buffer, uint16_t total_bytes) +{ + (void) rhport; + + uint8_t const epnum = tu_edpt_number(ep_addr); + uint8_t const dir = tu_edpt_dir(ep_addr); + + UsbDeviceDescBank* bank = &sram_registers[epnum][dir]; + UsbDeviceEndpoint* ep = &USB->DEVICE.DeviceEndpoint[epnum]; + + bank->ADDR.reg = (uint32_t) buffer; + + // A SETUP token can occur immediately after an ZLP Status. + // So make sure we have a valid buffer for setup packet. + // Status = ZLP EP0 with direction opposite to one in the dir bit of current setup + if ( (epnum == 0) && (buffer == NULL) && (total_bytes == 0) && (dir != tu_edpt_dir(_setup_packet[0])) ) { + prepare_setup(); + } + + if ( dir == TUSB_DIR_OUT ) + { + bank->PCKSIZE.bit.MULTI_PACKET_SIZE = total_bytes; + bank->PCKSIZE.bit.BYTE_COUNT = 0; + ep->EPSTATUSCLR.reg |= USB_DEVICE_EPSTATUSCLR_BK0RDY; + ep->EPINTFLAG.reg |= USB_DEVICE_EPINTFLAG_TRFAIL0; + } else + { + bank->PCKSIZE.bit.MULTI_PACKET_SIZE = 0; + bank->PCKSIZE.bit.BYTE_COUNT = total_bytes; + ep->EPSTATUSSET.reg |= USB_DEVICE_EPSTATUSSET_BK1RDY; + ep->EPINTFLAG.reg |= USB_DEVICE_EPINTFLAG_TRFAIL1; + } + + return true; +} + +void dcd_edpt_stall (uint8_t rhport, uint8_t ep_addr) +{ + (void) rhport; + + uint8_t const epnum = tu_edpt_number(ep_addr); + UsbDeviceEndpoint* ep = &USB->DEVICE.DeviceEndpoint[epnum]; + + if (tu_edpt_dir(ep_addr) == TUSB_DIR_IN) { + ep->EPSTATUSSET.reg = USB_DEVICE_EPSTATUSSET_STALLRQ1; + } else { + ep->EPSTATUSSET.reg = USB_DEVICE_EPSTATUSSET_STALLRQ0; + } +} + +void dcd_edpt_clear_stall (uint8_t rhport, uint8_t ep_addr) +{ + (void) rhport; + + uint8_t const epnum = tu_edpt_number(ep_addr); + UsbDeviceEndpoint* ep = &USB->DEVICE.DeviceEndpoint[epnum]; + + if (tu_edpt_dir(ep_addr) == TUSB_DIR_IN) { + ep->EPSTATUSCLR.reg = USB_DEVICE_EPSTATUSCLR_STALLRQ1 | USB_DEVICE_EPSTATUSCLR_DTGLIN; + } else { + ep->EPSTATUSCLR.reg = USB_DEVICE_EPSTATUSCLR_STALLRQ0 | USB_DEVICE_EPSTATUSCLR_DTGLOUT; + } +} + +//--------------------------------------------------------------------+ +// Interrupt Handler +//--------------------------------------------------------------------+ +void maybe_transfer_complete(void) { + uint32_t epints = USB->DEVICE.EPINTSMRY.reg; + + for (uint8_t epnum = 0; epnum < USB_EPT_NUM; epnum++) { + if ((epints & (1 << epnum)) == 0) { + continue; + } + + UsbDeviceEndpoint* ep = &USB->DEVICE.DeviceEndpoint[epnum]; + uint32_t epintflag = ep->EPINTFLAG.reg; + + // Handle IN completions + if ((epintflag & USB_DEVICE_EPINTFLAG_TRCPT1) != 0) { + UsbDeviceDescBank* bank = &sram_registers[epnum][TUSB_DIR_IN]; + uint16_t const total_transfer_size = bank->PCKSIZE.bit.BYTE_COUNT; + + dcd_event_xfer_complete(0, epnum | TUSB_DIR_IN_MASK, total_transfer_size, XFER_RESULT_SUCCESS, true); + + ep->EPINTFLAG.reg = USB_DEVICE_EPINTFLAG_TRCPT1; + } + + // Handle OUT completions + if ((epintflag & USB_DEVICE_EPINTFLAG_TRCPT0) != 0) { + UsbDeviceDescBank* bank = &sram_registers[epnum][TUSB_DIR_OUT]; + uint16_t const total_transfer_size = bank->PCKSIZE.bit.BYTE_COUNT; + + dcd_event_xfer_complete(0, epnum, total_transfer_size, XFER_RESULT_SUCCESS, true); + + ep->EPINTFLAG.reg = USB_DEVICE_EPINTFLAG_TRCPT0; + } + } +} + + +void dcd_int_handler (uint8_t rhport) +{ + (void) rhport; + + uint32_t int_status = USB->DEVICE.INTFLAG.reg & USB->DEVICE.INTENSET.reg; + + // Start of Frame + if ( int_status & USB_DEVICE_INTFLAG_SOF ) + { + USB->DEVICE.INTFLAG.reg = USB_DEVICE_INTFLAG_SOF; + dcd_event_bus_signal(0, DCD_EVENT_SOF, true); + } + + // SAMD doesn't distinguish between Suspend and Disconnect state. + // Both condition will cause SUSPEND interrupt triggered. + // To prevent being triggered when D+/D- are not stable, SUSPEND interrupt is only + // enabled when we received SET_ADDRESS request and cleared on Bus Reset + if ( int_status & USB_DEVICE_INTFLAG_SUSPEND ) + { + USB->DEVICE.INTFLAG.reg = USB_DEVICE_INTFLAG_SUSPEND; + + // Enable wakeup interrupt + USB->DEVICE.INTFLAG.reg = USB_DEVICE_INTFLAG_WAKEUP; // clear pending + USB->DEVICE.INTENSET.reg = USB_DEVICE_INTFLAG_WAKEUP; + + dcd_event_bus_signal(0, DCD_EVENT_SUSPEND, true); + } + + // Wakeup interrupt is only enabled when we got suspended. + // Wakeup interrupt will disable itself + if ( int_status & USB_DEVICE_INTFLAG_WAKEUP ) + { + USB->DEVICE.INTFLAG.reg = USB_DEVICE_INTFLAG_WAKEUP; + + // disable wakeup interrupt itself + USB->DEVICE.INTENCLR.reg = USB_DEVICE_INTFLAG_WAKEUP; + dcd_event_bus_signal(0, DCD_EVENT_RESUME, true); + } + + // Enable of Reset + if ( int_status & USB_DEVICE_INTFLAG_EORST ) + { + USB->DEVICE.INTFLAG.reg = USB_DEVICE_INTFLAG_EORST; + + // Disable both suspend and wakeup interrupt + USB->DEVICE.INTENCLR.reg = USB_DEVICE_INTFLAG_WAKEUP | USB_DEVICE_INTFLAG_SUSPEND; + + bus_reset(); + dcd_event_bus_reset(0, TUSB_SPEED_FULL, true); + } + + // Handle SETUP packet + if (USB->DEVICE.DeviceEndpoint[0].EPINTFLAG.bit.RXSTP) + { + // This copies the data elsewhere so we can reuse the buffer. + dcd_event_setup_received(0, _setup_packet, true); + + // Although Setup packet only set RXSTP bit, + // TRCPT0 bit could already be set by previous ZLP OUT Status (not handled until now). + // Since control status complete event is optional, we can just clear TRCPT0 and skip the status event + USB->DEVICE.DeviceEndpoint[0].EPINTFLAG.reg = USB_DEVICE_EPINTFLAG_RXSTP | USB_DEVICE_EPINTFLAG_TRCPT0; + } + + // Handle complete transfer + maybe_transfer_complete(); +} + +#endif |