Diff: USBDevice/USBHAL_LPC40.cpp

Revision:

10:1e3d126a322b

Child:

12:6030a12b6c62

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/USBDevice/USBHAL_LPC40.cpp	Thu May 30 17:16:57 2013 +0100
@@ -0,0 +1,625 @@
+/* Copyright (c) 2010-2011 mbed.org, MIT License
+*
+* 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.
+*/
+
+#if defined(TARGET_LPC4088)
+
+#include "USBHAL.h"
+
+
+// Get endpoint direction
+#define IN_EP(endpoint)     ((endpoint) & 1U ? true : false)
+#define OUT_EP(endpoint)    ((endpoint) & 1U ? false : true)
+
+// Convert physical endpoint number to register bit
+#define EP(endpoint) (1UL<<endpoint)
+
+// Power Control for Peripherals register
+#define PCUSB      (1UL<<31)
+
+// USB Clock Control register
+#define DEV_CLK_EN (1UL<<1)
+#define AHB_CLK_EN (1UL<<4)
+
+// USB Clock Status register
+#define DEV_CLK_ON (1UL<<1)
+#define AHB_CLK_ON (1UL<<4)
+
+// USB Device Interupt registers
+#define FRAME      (1UL<<0)
+#define EP_FAST    (1UL<<1)
+#define EP_SLOW    (1UL<<2)
+#define DEV_STAT   (1UL<<3)
+#define CCEMPTY    (1UL<<4)
+#define CDFULL     (1UL<<5)
+#define RxENDPKT   (1UL<<6)
+#define TxENDPKT   (1UL<<7)
+#define EP_RLZED   (1UL<<8)
+#define ERR_INT    (1UL<<9)
+
+// USB Control register
+#define RD_EN (1<<0)
+#define WR_EN (1<<1)
+#define LOG_ENDPOINT(endpoint) ((endpoint>>1)<<2)
+
+// USB Receive Packet Length register
+#define DV      (1UL<<10)
+#define PKT_RDY (1UL<<11)
+#define PKT_LNGTH_MASK (0x3ff)
+
+// Serial Interface Engine (SIE)
+#define SIE_WRITE   (0x01)
+#define SIE_READ    (0x02)
+#define SIE_COMMAND (0x05)
+#define SIE_CMD_CODE(phase, data) ((phase<<8)|(data<<16))
+
+// SIE Command codes
+#define SIE_CMD_SET_ADDRESS        (0xD0)
+#define SIE_CMD_CONFIGURE_DEVICE   (0xD8)
+#define SIE_CMD_SET_MODE           (0xF3)
+#define SIE_CMD_READ_FRAME_NUMBER  (0xF5)
+#define SIE_CMD_READ_TEST_REGISTER (0xFD)
+#define SIE_CMD_SET_DEVICE_STATUS  (0xFE)
+#define SIE_CMD_GET_DEVICE_STATUS  (0xFE)
+#define SIE_CMD_GET_ERROR_CODE     (0xFF)
+#define SIE_CMD_READ_ERROR_STATUS  (0xFB)
+
+#define SIE_CMD_SELECT_ENDPOINT(endpoint)                 (0x00+endpoint)
+#define SIE_CMD_SELECT_ENDPOINT_CLEAR_INTERRUPT(endpoint) (0x40+endpoint)
+#define SIE_CMD_SET_ENDPOINT_STATUS(endpoint)             (0x40+endpoint)
+
+#define SIE_CMD_CLEAR_BUFFER    (0xF2)
+#define SIE_CMD_VALIDATE_BUFFER (0xFA)
+
+// SIE Device Status register
+#define SIE_DS_CON    (1<<0)
+#define SIE_DS_CON_CH (1<<1)
+#define SIE_DS_SUS    (1<<2)
+#define SIE_DS_SUS_CH (1<<3)
+#define SIE_DS_RST    (1<<4)
+
+// SIE Device Set Address register
+#define SIE_DSA_DEV_EN  (1<<7)
+
+// SIE Configue Device register
+#define SIE_CONF_DEVICE (1<<0)
+
+// Select Endpoint register
+#define SIE_SE_FE       (1<<0)
+#define SIE_SE_ST       (1<<1)
+#define SIE_SE_STP      (1<<2)
+#define SIE_SE_PO       (1<<3)
+#define SIE_SE_EPN      (1<<4)
+#define SIE_SE_B_1_FULL (1<<5)
+#define SIE_SE_B_2_FULL (1<<6)
+
+// Set Endpoint Status command
+#define SIE_SES_ST      (1<<0)
+#define SIE_SES_DA      (1<<5)
+#define SIE_SES_RF_MO   (1<<6)
+#define SIE_SES_CND_ST  (1<<7)
+
+
+USBHAL * USBHAL::instance;
+
+static volatile int epComplete;
+static uint32_t endpointStallState;
+
+static void SIECommand(uint32_t command) {
+    // The command phase of a SIE transaction
+    LPC_USB->DevIntClr = CCEMPTY;
+    LPC_USB->CmdCode = SIE_CMD_CODE(SIE_COMMAND, command);
+    while (!(LPC_USB->DevIntSt & CCEMPTY));
+}
+
+static void SIEWriteData(uint8_t data) {
+    // The data write phase of a SIE transaction
+    LPC_USB->DevIntClr = CCEMPTY;
+    LPC_USB->CmdCode = SIE_CMD_CODE(SIE_WRITE, data);
+    while (!(LPC_USB->DevIntSt & CCEMPTY));
+}
+
+static uint8_t SIEReadData(uint32_t command) {
+    // The data read phase of a SIE transaction
+    LPC_USB->DevIntClr = CDFULL;
+    LPC_USB->CmdCode = SIE_CMD_CODE(SIE_READ, command);
+    while (!(LPC_USB->DevIntSt & CDFULL));
+    return (uint8_t)LPC_USB->CmdData;
+}
+
+static void SIEsetDeviceStatus(uint8_t status) {
+    // Write SIE device status register
+    SIECommand(SIE_CMD_SET_DEVICE_STATUS);
+    SIEWriteData(status);
+}
+
+static uint8_t SIEgetDeviceStatus(void) {
+    // Read SIE device status register
+    SIECommand(SIE_CMD_GET_DEVICE_STATUS);
+    return SIEReadData(SIE_CMD_GET_DEVICE_STATUS);
+}
+
+void SIEsetAddress(uint8_t address) {
+    // Write SIE device address register
+    SIECommand(SIE_CMD_SET_ADDRESS);
+    SIEWriteData((address & 0x7f) | SIE_DSA_DEV_EN);
+}
+
+static uint8_t SIEselectEndpoint(uint8_t endpoint) {
+    // SIE select endpoint command
+    SIECommand(SIE_CMD_SELECT_ENDPOINT(endpoint));
+    return SIEReadData(SIE_CMD_SELECT_ENDPOINT(endpoint));
+}
+
+static uint8_t SIEclearBuffer(void) {
+    // SIE clear buffer command
+    SIECommand(SIE_CMD_CLEAR_BUFFER);
+    return SIEReadData(SIE_CMD_CLEAR_BUFFER);
+}
+
+static void SIEvalidateBuffer(void) {
+    // SIE validate buffer command
+    SIECommand(SIE_CMD_VALIDATE_BUFFER);
+}
+
+static void SIEsetEndpointStatus(uint8_t endpoint, uint8_t status) {
+    // SIE set endpoint status command
+    SIECommand(SIE_CMD_SET_ENDPOINT_STATUS(endpoint));
+    SIEWriteData(status);
+}
+
+static uint16_t SIEgetFrameNumber(void) __attribute__ ((unused));
+static uint16_t SIEgetFrameNumber(void) {
+    // Read current frame number
+    uint16_t lowByte;
+    uint16_t highByte;
+
+    SIECommand(SIE_CMD_READ_FRAME_NUMBER);
+    lowByte = SIEReadData(SIE_CMD_READ_FRAME_NUMBER);
+    highByte = SIEReadData(SIE_CMD_READ_FRAME_NUMBER);
+
+    return (highByte << 8) | lowByte;
+}
+
+static void SIEconfigureDevice(void) {
+    // SIE Configure device command
+    SIECommand(SIE_CMD_CONFIGURE_DEVICE);
+    SIEWriteData(SIE_CONF_DEVICE);
+}
+
+static void SIEunconfigureDevice(void) {
+    // SIE Configure device command
+    SIECommand(SIE_CMD_CONFIGURE_DEVICE);
+    SIEWriteData(0);
+}
+
+static void SIEconnect(void) {
+    // Connect USB device
+    uint8_t status = SIEgetDeviceStatus();
+    SIEsetDeviceStatus(status | SIE_DS_CON);
+}
+
+
+static void SIEdisconnect(void) {
+    // Disconnect USB device
+    uint8_t status = SIEgetDeviceStatus();
+    SIEsetDeviceStatus(status & ~SIE_DS_CON);
+}
+
+
+static uint8_t selectEndpointClearInterrupt(uint8_t endpoint) {
+    // Implemented using using EP_INT_CLR.
+    LPC_USB->EpIntClr = EP(endpoint);
+    while (!(LPC_USB->DevIntSt & CDFULL));
+    return (uint8_t)LPC_USB->CmdData;
+}
+
+
+static void enableEndpointEvent(uint8_t endpoint) {
+    // Enable an endpoint interrupt
+    LPC_USB->EpIntEn |= EP(endpoint);
+}
+
+static void disableEndpointEvent(uint8_t endpoint) __attribute__ ((unused));
+static void disableEndpointEvent(uint8_t endpoint) {
+    // Disable an endpoint interrupt
+    LPC_USB->EpIntEn &= ~EP(endpoint);
+}
+
+static volatile uint32_t __attribute__((used)) dummyRead;
+uint32_t USBHAL::endpointReadcore(uint8_t endpoint, uint8_t *buffer) {
+    // Read from an OUT endpoint
+    uint32_t size;
+    uint32_t i;
+    uint32_t data = 0;
+    uint8_t offset;
+
+    LPC_USB->Ctrl = LOG_ENDPOINT(endpoint) | RD_EN;
+    while (!(LPC_USB->RxPLen & PKT_RDY));
+
+    size = LPC_USB->RxPLen & PKT_LNGTH_MASK;
+
+    offset = 0;
+
+    if (size > 0) {
+        for (i=0; i<size; i++) {
+            if (offset==0) {
+                // Fetch up to four bytes of data as a word
+                data = LPC_USB->RxData;
+            }
+
+            // extract a byte
+            *buffer = (data>>offset) & 0xff;
+            buffer++;
+
+            // move on to the next byte
+            offset = (offset + 8) % 32;
+        }
+    } else {
+        dummyRead = LPC_USB->RxData;
+    }
+
+    LPC_USB->Ctrl = 0;
+
+    if ((endpoint >> 1) % 3 || (endpoint >> 1) == 0) {
+        SIEselectEndpoint(endpoint);
+        SIEclearBuffer();
+    }
+    
+    return size;
+}
+
+static void endpointWritecore(uint8_t endpoint, uint8_t *buffer, uint32_t size) {
+    // Write to an IN endpoint
+    uint32_t temp, data;
+    uint8_t offset;
+
+    LPC_USB->Ctrl = LOG_ENDPOINT(endpoint) | WR_EN;
+
+    LPC_USB->TxPLen = size;
+    offset = 0;
+    data = 0;
+
+    if (size>0) {
+        do {
+            // Fetch next data byte into a word-sized temporary variable
+            temp = *buffer++;
+
+            // Add to current data word
+            temp = temp << offset;
+            data = data | temp;
+
+            // move on to the next byte
+            offset = (offset + 8) % 32;
+            size--;
+
+            if ((offset==0) || (size==0)) {
+                // Write the word to the endpoint
+                LPC_USB->TxData = data;
+                data = 0;
+            }
+        } while (size>0);
+    } else {
+        LPC_USB->TxData = 0;
+    }
+
+    // Clear WR_EN to cover zero length packet case
+    LPC_USB->Ctrl=0;
+
+    SIEselectEndpoint(endpoint);
+    SIEvalidateBuffer();
+}
+
+USBHAL::USBHAL(void) {
+    // Disable IRQ
+    NVIC_DisableIRQ(USB_IRQn);
+    
+    // fill in callback array
+    epCallback[0] = &USBHAL::EP1_OUT_callback;
+    epCallback[1] = &USBHAL::EP1_IN_callback;
+    epCallback[2] = &USBHAL::EP2_OUT_callback;
+    epCallback[3] = &USBHAL::EP2_IN_callback;
+    epCallback[4] = &USBHAL::EP3_OUT_callback;
+    epCallback[5] = &USBHAL::EP3_IN_callback;
+    epCallback[6] = &USBHAL::EP4_OUT_callback;
+    epCallback[7] = &USBHAL::EP4_IN_callback;
+    epCallback[8] = &USBHAL::EP5_OUT_callback;
+    epCallback[9] = &USBHAL::EP5_IN_callback;
+    epCallback[10] = &USBHAL::EP6_OUT_callback;
+    epCallback[11] = &USBHAL::EP6_IN_callback;
+    epCallback[12] = &USBHAL::EP7_OUT_callback;
+    epCallback[13] = &USBHAL::EP7_IN_callback;
+    epCallback[14] = &USBHAL::EP8_OUT_callback;
+    epCallback[15] = &USBHAL::EP8_IN_callback;
+    epCallback[16] = &USBHAL::EP9_OUT_callback;
+    epCallback[17] = &USBHAL::EP9_IN_callback;
+    epCallback[18] = &USBHAL::EP10_OUT_callback;
+    epCallback[19] = &USBHAL::EP10_IN_callback;
+    epCallback[20] = &USBHAL::EP11_OUT_callback;
+    epCallback[21] = &USBHAL::EP11_IN_callback;
+    epCallback[22] = &USBHAL::EP12_OUT_callback;
+    epCallback[23] = &USBHAL::EP12_IN_callback;
+    epCallback[24] = &USBHAL::EP13_OUT_callback;
+    epCallback[25] = &USBHAL::EP13_IN_callback;
+    epCallback[26] = &USBHAL::EP14_OUT_callback;
+    epCallback[27] = &USBHAL::EP14_IN_callback;
+    epCallback[28] = &USBHAL::EP15_OUT_callback;
+    epCallback[29] = &USBHAL::EP15_IN_callback;
+
+    // Enable power to USB device controller
+    LPC_SC->PCONP |= PCUSB;
+
+    // Enable USB clocks
+    LPC_USB->USBClkCtrl |= DEV_CLK_EN | AHB_CLK_EN;
+    while ((LPC_USB->USBClkSt & (DEV_CLK_EN | AHB_CLK_EN)) != (DEV_CLK_ON | AHB_CLK_ON));
+
+    // Configure pins P0.29 and P0.30 to be USB D+ and USB D-
+    LPC_IOCON->P0_29 &= ~0x07;
+    LPC_IOCON->P0_29 |= 0x01;
+    LPC_IOCON->P0_30 &= ~0x07;
+    LPC_IOCON->P0_30 |= 0x01;    
+    
+    // Disconnect USB device
+    SIEdisconnect();
+
+    // Configure pin P2.9 to be Connect
+    LPC_IOCON->P2_9 &= ~0x07;
+    LPC_IOCON->P2_9 |= 0x01;    
+
+    // Connect must be low for at least 2.5uS
+    wait(0.3);
+
+    // Set the maximum packet size for the control endpoints
+    realiseEndpoint(EP0IN, MAX_PACKET_SIZE_EP0, 0);
+    realiseEndpoint(EP0OUT, MAX_PACKET_SIZE_EP0, 0);
+
+    // Attach IRQ
+    instance = this;
+    NVIC_SetVector(USB_IRQn, (uint32_t)&_usbisr);
+
+    // Enable interrupts for device events and EP0
+    LPC_USB->DevIntEn = EP_SLOW | DEV_STAT | FRAME;
+    enableEndpointEvent(EP0IN);
+    enableEndpointEvent(EP0OUT);
+}
+
+USBHAL::~USBHAL(void) {
+    // Ensure device disconnected
+    SIEdisconnect();
+    // Disable USB interrupts
+    NVIC_DisableIRQ(USB_IRQn);
+}
+
+void USBHAL::connect(void) {
+    NVIC_EnableIRQ(USB_IRQn);
+    // Connect USB device
+    SIEconnect();
+}
+
+void USBHAL::disconnect(void) {
+    NVIC_DisableIRQ(USB_IRQn);
+    // Disconnect USB device
+    SIEdisconnect();
+}
+
+void USBHAL::configureDevice(void) {
+    SIEconfigureDevice();
+}
+
+void USBHAL::unconfigureDevice(void) {
+    SIEunconfigureDevice();
+}
+
+void USBHAL::setAddress(uint8_t address) {
+    SIEsetAddress(address);
+}
+
+void USBHAL::EP0setup(uint8_t *buffer) {
+    endpointReadcore(EP0OUT, buffer);
+}
+
+void USBHAL::EP0read(void) {
+    // Not required
+}
+
+void USBHAL::EP0readStage(void) {
+    // Not required
+}
+
+uint32_t USBHAL::EP0getReadResult(uint8_t *buffer) {
+    return endpointReadcore(EP0OUT, buffer);
+}
+
+void USBHAL::EP0write(uint8_t *buffer, uint32_t size) {
+    endpointWritecore(EP0IN, buffer, size);
+}
+
+void USBHAL::EP0getWriteResult(void) {
+    // Not required
+}
+
+void USBHAL::EP0stall(void) {
+    // This will stall both control endpoints
+    stallEndpoint(EP0OUT);
+}
+
+EP_STATUS USBHAL::endpointRead(uint8_t endpoint, uint32_t maximumSize) {
+    return EP_PENDING;
+}
+
+EP_STATUS USBHAL::endpointReadResult(uint8_t endpoint, uint8_t * buffer, uint32_t *bytesRead) {
+
+    //for isochronous endpoint, we don't wait an interrupt
+    if ((endpoint >> 1) % 3 || (endpoint >> 1) == 0) {
+        if (!(epComplete & EP(endpoint)))
+            return EP_PENDING;
+    }
+    
+    *bytesRead = endpointReadcore(endpoint, buffer);
+    epComplete &= ~EP(endpoint);
+    return EP_COMPLETED;
+}
+
+EP_STATUS USBHAL::endpointWrite(uint8_t endpoint, uint8_t *data, uint32_t size) {
+    if (getEndpointStallState(endpoint)) {
+        return EP_STALLED;
+    }
+
+    epComplete &= ~EP(endpoint);
+
+    endpointWritecore(endpoint, data, size);
+    return EP_PENDING;
+}
+
+EP_STATUS USBHAL::endpointWriteResult(uint8_t endpoint) {
+    if (epComplete & EP(endpoint)) {
+        epComplete &= ~EP(endpoint);
+        return EP_COMPLETED;
+    }
+
+    return EP_PENDING;
+}
+
+bool USBHAL::realiseEndpoint(uint8_t endpoint, uint32_t maxPacket, uint32_t flags) {
+    // Realise an endpoint
+    LPC_USB->DevIntClr = EP_RLZED;
+    LPC_USB->ReEp |= EP(endpoint);
+    LPC_USB->EpInd = endpoint;
+    LPC_USB->MaxPSize = maxPacket;
+
+    while (!(LPC_USB->DevIntSt & EP_RLZED));
+    LPC_USB->DevIntClr = EP_RLZED;
+
+    // Clear stall state
+    endpointStallState &= ~EP(endpoint);
+
+    enableEndpointEvent(endpoint);
+    return true;
+}
+
+void USBHAL::stallEndpoint(uint8_t endpoint) {
+    // Stall an endpoint
+    if ( (endpoint==EP0IN) || (endpoint==EP0OUT) ) {
+        // Conditionally stall both control endpoints
+        SIEsetEndpointStatus(EP0OUT, SIE_SES_CND_ST);
+    } else {
+        SIEsetEndpointStatus(endpoint, SIE_SES_ST);
+
+        // Update stall state
+        endpointStallState |= EP(endpoint);
+    }
+}
+
+void USBHAL::unstallEndpoint(uint8_t endpoint) {
+    // Unstall an endpoint. The endpoint will also be reinitialised
+    SIEsetEndpointStatus(endpoint, 0);
+
+    // Update stall state
+    endpointStallState &= ~EP(endpoint);
+}
+
+bool USBHAL::getEndpointStallState(uint8_t endpoint) {
+    // Returns true if endpoint stalled
+    return endpointStallState & EP(endpoint);
+}
+
+void USBHAL::remoteWakeup(void) {
+    // Remote wakeup
+    uint8_t status;
+
+    // Enable USB clocks
+    LPC_USB->USBClkCtrl |= DEV_CLK_EN | AHB_CLK_EN;
+    while (LPC_USB->USBClkSt != (DEV_CLK_ON | AHB_CLK_ON));
+
+    status = SIEgetDeviceStatus();
+    SIEsetDeviceStatus(status & ~SIE_DS_SUS);
+}
+
+void USBHAL::_usbisr(void) {
+    instance->usbisr();
+}
+
+
+void USBHAL::usbisr(void) {
+    uint8_t devStat;
+
+    if (LPC_USB->DevIntSt & FRAME) {
+        // Start of frame event
+        SOF(SIEgetFrameNumber());
+        // Clear interrupt status flag
+        LPC_USB->DevIntClr = FRAME;
+    }
+
+    if (LPC_USB->DevIntSt & DEV_STAT) {
+        // Device Status interrupt
+        // Must clear the interrupt status flag before reading the device status from the SIE
+        LPC_USB->DevIntClr = DEV_STAT;
+
+        // Read device status from SIE
+        devStat = SIEgetDeviceStatus();
+        //printf("devStat: %d\r\n", devStat);
+
+        if (devStat & SIE_DS_SUS_CH) {
+            // Suspend status changed
+            if((devStat & SIE_DS_SUS) != 0) {
+                suspendStateChanged(0);
+            }
+        }
+
+        if (devStat & SIE_DS_RST) {
+            // Bus reset
+            if((devStat & SIE_DS_SUS) == 0) {
+                suspendStateChanged(1);
+            }
+            busReset();
+        }
+    }
+
+    if (LPC_USB->DevIntSt & EP_SLOW) {
+        // (Slow) Endpoint Interrupt
+
+        // Process each endpoint interrupt
+        if (LPC_USB->EpIntSt & EP(EP0OUT)) {
+            if (selectEndpointClearInterrupt(EP0OUT) & SIE_SE_STP) {
+                // this is a setup packet
+                EP0setupCallback();
+            } else {
+                EP0out();
+            }
+            LPC_USB->DevIntClr = EP_SLOW;
+        }
+
+        if (LPC_USB->EpIntSt & EP(EP0IN)) {
+            selectEndpointClearInterrupt(EP0IN);
+            LPC_USB->DevIntClr = EP_SLOW;
+            EP0in();
+        }
+        
+        for (uint8_t num = 2; num < 16*2; num++) {
+            if (LPC_USB->EpIntSt & EP(num)) {
+                selectEndpointClearInterrupt(num);
+                epComplete |= EP(num);
+                LPC_USB->DevIntClr = EP_SLOW;
+                if ((instance->*(epCallback[num - 2]))()) {
+                    epComplete &= ~EP(num);
+                }
+            }
+        }
+    }
+}
+
+#endif