USBHAL_STM32F4.cpp

00001 /* Copyright (c) 2010-2011 mbed.org, MIT License
00002 *
00003 * Permission is hereby granted, free of charge, to any person obtaining a copy of this software
00004 * and associated documentation files (the "Software"), to deal in the Software without
00005 * restriction, including without limitation the rights to use, copy, modify, merge, publish,
00006 * distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the
00007 * Software is furnished to do so, subject to the following conditions:
00008 *
00009 * The above copyright notice and this permission notice shall be included in all copies or
00010 * substantial portions of the Software.
00011 *
00012 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING
00013 * BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
00014 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
00015 * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
00016 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
00017 */
00018 
00019 #if defined(TARGET_STM32F4)
00020 
00021 #include "USBHAL.h"
00022 #include "USBRegs_STM32.h"
00023 #include "pinmap.h"
00024 
00025 USBHAL * USBHAL::instance;
00026 
00027 static volatile int epComplete = 0;
00028 
00029 static uint32_t bufferEnd = 0;
00030 static const uint32_t rxFifoSize = 512;
00031 static uint32_t rxFifoCount = 0;
00032 
00033 static uint32_t setupBuffer[MAX_PACKET_SIZE_EP0 >> 2];
00034 
00035 uint32_t USBHAL::endpointReadcore(uint8_t endpoint, uint8_t *buffer) {
00036     return 0;
00037 }
00038 
00039 USBHAL::USBHAL(void) {
00040     NVIC_DisableIRQ(OTG_FS_IRQn);
00041     epCallback[0] = &USBHAL::EP1_OUT_callback;
00042     epCallback[1] = &USBHAL::EP1_IN_callback;
00043     epCallback[2] = &USBHAL::EP2_OUT_callback;
00044     epCallback[3] = &USBHAL::EP2_IN_callback;
00045     epCallback[4] = &USBHAL::EP3_OUT_callback;
00046     epCallback[5] = &USBHAL::EP3_IN_callback;
00047 
00048     // Enable power and clocking
00049     RCC->AHB1ENR |= RCC_AHB1ENR_GPIOAEN;
00050 
00051 #if defined(TARGET_STM32F407VG) || defined(TARGET_STM32F401RE) || defined(TARGET_STM32F411RE) || defined(TARGET_STM32F429ZI)
00052     pin_function(PA_8, STM_PIN_DATA(STM_MODE_AF_PP, GPIO_NOPULL, GPIO_AF10_OTG_FS));
00053     pin_function(PA_9, STM_PIN_DATA(STM_MODE_INPUT, GPIO_PULLDOWN, GPIO_AF10_OTG_FS));
00054     pin_function(PA_10, STM_PIN_DATA(STM_MODE_AF_OD, GPIO_PULLUP, GPIO_AF10_OTG_FS));
00055     pin_function(PA_11, STM_PIN_DATA(STM_MODE_AF_PP, GPIO_NOPULL, GPIO_AF10_OTG_FS));
00056     pin_function(PA_12, STM_PIN_DATA(STM_MODE_AF_PP, GPIO_NOPULL, GPIO_AF10_OTG_FS));
00057 #else
00058     pin_function(PA_8, STM_PIN_DATA(2, 10));
00059     pin_function(PA_9, STM_PIN_DATA(0, 0));
00060     pin_function(PA_10, STM_PIN_DATA(2, 10));
00061     pin_function(PA_11, STM_PIN_DATA(2, 10));
00062     pin_function(PA_12, STM_PIN_DATA(2, 10));
00063 
00064     // Set ID pin to open drain with pull-up resistor
00065     pin_mode(PA_10, OpenDrain);
00066     GPIOA->PUPDR &= ~(0x3 << 20);
00067     GPIOA->PUPDR |= 1 << 20;
00068 
00069     // Set VBUS pin to open drain
00070     pin_mode(PA_9, OpenDrain);
00071 #endif
00072 
00073     RCC->AHB2ENR |= RCC_AHB2ENR_OTGFSEN;
00074 
00075     // Enable interrupts
00076     OTG_FS->GREGS.GAHBCFG |= (1 << 0);
00077 
00078     // Turnaround time to maximum value - too small causes packet loss
00079     OTG_FS->GREGS.GUSBCFG |= (0xF << 10);
00080 
00081     // Unmask global interrupts
00082     OTG_FS->GREGS.GINTMSK |= (1 << 3) | // SOF
00083                              (1 << 4) | // RX FIFO not empty
00084                              (1 << 12); // USB reset
00085 
00086     OTG_FS->DREGS.DCFG |= (0x3 << 0) | // Full speed
00087                           (1 << 2); // Non-zero-length status OUT handshake
00088 
00089     OTG_FS->GREGS.GCCFG |= (1 << 19) | // Enable VBUS sensing
00090                            (1 << 16); // Power Up
00091 
00092     instance = this;
00093     NVIC_SetVector(OTG_FS_IRQn, (uint32_t)&_usbisr);
00094     NVIC_SetPriority(OTG_FS_IRQn, 1);
00095 }
00096 
00097 USBHAL::~USBHAL(void) {
00098 }
00099 
00100 void USBHAL::connect(void) {
00101     NVIC_EnableIRQ(OTG_FS_IRQn);
00102 }
00103 
00104 void USBHAL::disconnect(void) {
00105     NVIC_DisableIRQ(OTG_FS_IRQn);
00106 }
00107 
00108 void USBHAL::configureDevice(void) {
00109     // Not needed
00110 }
00111 
00112 void USBHAL::unconfigureDevice(void) {
00113     // Not needed
00114 }
00115 
00116 void USBHAL::setAddress(uint8_t address) {
00117     OTG_FS->DREGS.DCFG |= (address << 4);
00118     EP0write(0, 0);
00119 }
00120 
00121 bool USBHAL::realiseEndpoint(uint8_t endpoint, uint32_t maxPacket,
00122                              uint32_t flags) {
00123     uint32_t epIndex = endpoint >> 1;
00124 
00125     uint32_t type;
00126     switch (endpoint) {
00127         case EP0IN:
00128         case EP0OUT:
00129             type = 0;
00130             break;
00131         case EPISO_IN:
00132         case EPISO_OUT:
00133             type = 1;
00134         case EPBULK_IN:
00135         case EPBULK_OUT:
00136             type = 2;
00137             break;
00138         case EPINT_IN:
00139         case EPINT_OUT:
00140             type = 3;
00141             break;
00142     }
00143 
00144     // Generic in or out EP controls
00145     uint32_t control = (maxPacket << 0) | // Packet size
00146                        (1 << 15) | // Active endpoint
00147                        (type << 18); // Endpoint type
00148 
00149     if (endpoint & 0x1) { // In Endpoint
00150         // Set up the Tx FIFO
00151         if (endpoint == EP0IN) {
00152             OTG_FS->GREGS.DIEPTXF0_HNPTXFSIZ = ((maxPacket >> 2) << 16) |
00153                                                (bufferEnd << 0);
00154         }
00155         else {
00156             OTG_FS->GREGS.DIEPTXF[epIndex - 1] = ((maxPacket >> 2) << 16) |
00157                                                  (bufferEnd << 0);
00158         }
00159         bufferEnd += maxPacket >> 2;
00160 
00161         // Set the In EP specific control settings
00162         if (endpoint != EP0IN) {
00163             control |= (1 << 28); // SD0PID
00164         }
00165 
00166         control |= (epIndex << 22) | // TxFIFO index
00167                    (1 << 27); // SNAK
00168         OTG_FS->INEP_REGS[epIndex].DIEPCTL = control;
00169 
00170         // Unmask the interrupt
00171         OTG_FS->DREGS.DAINTMSK |= (1 << epIndex);
00172     }
00173     else { // Out endpoint
00174         // Set the out EP specific control settings
00175         control |= (1 << 26); // CNAK
00176         OTG_FS->OUTEP_REGS[epIndex].DOEPCTL = control;
00177 
00178         // Unmask the interrupt
00179         OTG_FS->DREGS.DAINTMSK |= (1 << (epIndex + 16));
00180     }
00181     return true;
00182 }
00183 
00184 // read setup packet
00185 void USBHAL::EP0setup(uint8_t *buffer) {
00186     memcpy(buffer, setupBuffer, MAX_PACKET_SIZE_EP0);
00187 }
00188 
00189 void USBHAL::EP0readStage(void) {
00190 }
00191 
00192 void USBHAL::EP0read(void) {
00193 }
00194 
00195 uint32_t USBHAL::EP0getReadResult(uint8_t *buffer) {
00196     uint32_t* buffer32 = (uint32_t *) buffer;
00197     uint32_t length = rxFifoCount;
00198     for (uint32_t i = 0; i < length; i += 4) {
00199         buffer32[i >> 2] = OTG_FS->FIFO[0][0];
00200     }
00201 
00202     rxFifoCount = 0;
00203     return length;
00204 }
00205 
00206 void USBHAL::EP0write(uint8_t *buffer, uint32_t size) {
00207     endpointWrite(0, buffer, size);
00208 }
00209 
00210 void USBHAL::EP0getWriteResult(void) {
00211 }
00212 
00213 void USBHAL::EP0stall(void) {
00214     // If we stall the out endpoint here then we have problems transferring
00215     // and setup requests after the (stalled) get device qualifier requests.
00216     // TODO: Find out if this is correct behavior, or whether we are doing
00217     // something else wrong
00218     stallEndpoint(EP0IN);
00219 //    stallEndpoint(EP0OUT);
00220 }
00221 
00222 EP_STATUS USBHAL::endpointRead(uint8_t endpoint, uint32_t maximumSize) {
00223     uint32_t epIndex = endpoint >> 1;
00224     uint32_t size = (1 << 19) | // 1 packet
00225                     (maximumSize << 0); // Packet size
00226 //    if (endpoint == EP0OUT) {
00227         size |= (1 << 29); // 1 setup packet
00228 //    }
00229     OTG_FS->OUTEP_REGS[epIndex].DOEPTSIZ = size;
00230     OTG_FS->OUTEP_REGS[epIndex].DOEPCTL |= (1 << 31) | // Enable endpoint
00231                                            (1 << 26); // Clear NAK
00232 
00233     epComplete &= ~(1 << endpoint);
00234     return EP_PENDING;
00235 }
00236 
00237 EP_STATUS USBHAL::endpointReadResult(uint8_t endpoint, uint8_t * buffer, uint32_t *bytesRead) {
00238     if (!(epComplete & (1 << endpoint))) {
00239         return EP_PENDING;
00240     }
00241 
00242     uint32_t* buffer32 = (uint32_t *) buffer;
00243     uint32_t length = rxFifoCount;
00244     for (uint32_t i = 0; i < length; i += 4) {
00245         buffer32[i >> 2] = OTG_FS->FIFO[endpoint >> 1][0];
00246     }
00247     rxFifoCount = 0;
00248     *bytesRead = length;
00249     return EP_COMPLETED;
00250 }
00251 
00252 EP_STATUS USBHAL::endpointWrite(uint8_t endpoint, uint8_t *data, uint32_t size) {
00253     uint32_t epIndex = endpoint >> 1;
00254     OTG_FS->INEP_REGS[epIndex].DIEPTSIZ = (1 << 19) | // 1 packet
00255                                           (size << 0); // Size of packet
00256     OTG_FS->INEP_REGS[epIndex].DIEPCTL |= (1 << 31) | // Enable endpoint
00257                                           (1 << 26); // CNAK
00258     OTG_FS->DREGS.DIEPEMPMSK = (1 << epIndex);
00259 
00260     while ((OTG_FS->INEP_REGS[epIndex].DTXFSTS & 0XFFFF) < ((size + 3) >> 2));
00261 
00262     for (uint32_t i=0; i<(size + 3) >> 2; i++, data+=4) {
00263         OTG_FS->FIFO[epIndex][0] = *(uint32_t *)data;
00264     }
00265 
00266     epComplete &= ~(1 << endpoint);
00267 
00268     return EP_PENDING;
00269 }
00270 
00271 EP_STATUS USBHAL::endpointWriteResult(uint8_t endpoint) {
00272     if (epComplete & (1 << endpoint)) {
00273         epComplete &= ~(1 << endpoint);
00274         return EP_COMPLETED;
00275     }
00276 
00277     return EP_PENDING;
00278 }
00279 
00280 void USBHAL::stallEndpoint(uint8_t endpoint) {
00281     if (endpoint & 0x1) { // In EP
00282         OTG_FS->INEP_REGS[endpoint >> 1].DIEPCTL |= (1 << 30) | // Disable
00283                                                     (1 << 21); // Stall
00284     }
00285     else {  // Out EP
00286         OTG_FS->DREGS.DCTL |= (1 << 9); // Set global out NAK
00287         OTG_FS->OUTEP_REGS[endpoint >> 1].DOEPCTL |= (1 << 30) | // Disable
00288                                                      (1 << 21); // Stall
00289     }
00290 }
00291 
00292 void USBHAL::unstallEndpoint(uint8_t endpoint) {
00293 
00294 }
00295 
00296 bool USBHAL::getEndpointStallState(uint8_t endpoint) {
00297     return false;
00298 }
00299 
00300 void USBHAL::remoteWakeup(void) {
00301 }
00302 
00303 
00304 void USBHAL::_usbisr(void) {
00305     instance->usbisr();
00306 }
00307 
00308 
00309 void USBHAL::usbisr(void) {
00310     if (OTG_FS->GREGS.GINTSTS & (1 << 11)) { // USB Suspend
00311         suspendStateChanged(1);
00312     };
00313 
00314     if (OTG_FS->GREGS.GINTSTS & (1 << 12)) { // USB Reset
00315         suspendStateChanged(0);
00316 
00317         // Set SNAK bits
00318         OTG_FS->OUTEP_REGS[0].DOEPCTL |= (1 << 27);
00319         OTG_FS->OUTEP_REGS[1].DOEPCTL |= (1 << 27);
00320         OTG_FS->OUTEP_REGS[2].DOEPCTL |= (1 << 27);
00321         OTG_FS->OUTEP_REGS[3].DOEPCTL |= (1 << 27);
00322 
00323         OTG_FS->DREGS.DIEPMSK = (1 << 0);
00324 
00325         bufferEnd = 0;
00326 
00327         // Set the receive FIFO size
00328         OTG_FS->GREGS.GRXFSIZ = rxFifoSize >> 2;
00329         bufferEnd += rxFifoSize >> 2;
00330 
00331         // Create the endpoints, and wait for setup packets on out EP0
00332         realiseEndpoint(EP0IN, MAX_PACKET_SIZE_EP0, 0);
00333         realiseEndpoint(EP0OUT, MAX_PACKET_SIZE_EP0, 0);
00334         endpointRead(EP0OUT, MAX_PACKET_SIZE_EP0);
00335 
00336         OTG_FS->GREGS.GINTSTS = (1 << 12);
00337     }
00338 
00339     if (OTG_FS->GREGS.GINTSTS & (1 << 4)) { // RX FIFO not empty
00340         uint32_t status = OTG_FS->GREGS.GRXSTSP;
00341 
00342         uint32_t endpoint = (status & 0xF) << 1;
00343         uint32_t length = (status >> 4) & 0x7FF;
00344         uint32_t type = (status >> 17) & 0xF;
00345 
00346         rxFifoCount = length;
00347 
00348         if (type == 0x6) {
00349             // Setup packet
00350             for (uint32_t i=0; i<length; i+=4) {
00351                 setupBuffer[i >> 2] = OTG_FS->FIFO[0][i >> 2];
00352             }
00353             rxFifoCount = 0;
00354         }
00355 
00356         if (type == 0x4) {
00357             // Setup complete
00358             EP0setupCallback();
00359             endpointRead(EP0OUT, MAX_PACKET_SIZE_EP0);
00360         }
00361 
00362         if (type == 0x2) {
00363             // Out packet
00364             if (endpoint == EP0OUT) {
00365                 EP0out();
00366             }
00367             else {
00368                 epComplete |= (1 << endpoint);
00369                 if ((instance->*(epCallback[endpoint - 2]))()) {
00370                     epComplete &= (1 << endpoint);
00371                 }
00372             }
00373         }
00374 
00375         for (uint32_t i=0; i<rxFifoCount; i+=4) {
00376             (void) OTG_FS->FIFO[0][0];
00377         }
00378         OTG_FS->GREGS.GINTSTS = (1 << 4);
00379     }
00380 
00381     if (OTG_FS->GREGS.GINTSTS & (1 << 18)) { // In endpoint interrupt
00382         // Loop through the in endpoints
00383         for (uint32_t i=0; i<4; i++) {
00384             if (OTG_FS->DREGS.DAINT & (1 << i)) { // Interrupt is on endpoint
00385 
00386                 if (OTG_FS->INEP_REGS[i].DIEPINT & (1 << 7)) {// Tx FIFO empty
00387                     // If the Tx FIFO is empty on EP0 we need to send a further
00388                     // packet, so call EP0in()
00389                     if (i == 0) {
00390                         EP0in();
00391                     }
00392                     // Clear the interrupt
00393                     OTG_FS->INEP_REGS[i].DIEPINT = (1 << 7);
00394                     // Stop firing Tx empty interrupts
00395                     // Will get turned on again if another write is called
00396                     OTG_FS->DREGS.DIEPEMPMSK &= ~(1 << i);
00397                 }
00398 
00399                 // If the transfer is complete
00400                 if (OTG_FS->INEP_REGS[i].DIEPINT & (1 << 0)) { // Tx Complete
00401                     epComplete |= (1 << (1 + (i << 1)));
00402                     OTG_FS->INEP_REGS[i].DIEPINT = (1 << 0);
00403                 }
00404             }
00405         }
00406         OTG_FS->GREGS.GINTSTS = (1 << 18);
00407     }
00408 
00409     if (OTG_FS->GREGS.GINTSTS & (1 << 3)) { // Start of frame
00410         SOF((OTG_FS->GREGS.GRXSTSR >> 17) & 0xF);
00411         OTG_FS->GREGS.GINTSTS = (1 << 3);
00412     }
00413 }
00414 
00415 
00416 #endif