File content as of revision 2:0cdac6bcc534:

// Simple USBHost for FRDM-KL46Z
#include "USBHALHost.h"
#include <algorithm>

template <bool>struct CtAssert;
template <>struct CtAssert<true> {};
#define CTASSERT(A) CtAssert<A>();


#ifdef _USB_DBG
#define USB_DBG(...) do{fprintf(stderr,"[%s@%d] ",__PRETTY_FUNCTION__,__LINE__);fprintf(stderr,__VA_ARGS__);fprintf(stderr,"\n");} while(0);
#define USB_DBG_HEX(A,B) debug_hex(A,B)
void debug_hex(uint8_t* buf, int size);
#else
#define USB_DBG(...) while(0)
#define USB_DBG_HEX(A,B) while(0)
#endif

#define USB_TEST_ASSERT(A) while(!(A)){fprintf(stderr,"\n\n%s@%d %s ASSERT!\n\n",__PRETTY_FUNCTION__,__LINE__,#A);exit(1);};
#define USB_TEST_ASSERT_FALSE(A) USB_TEST_ASSERT(!(A))

#define BD_OWN_MASK        (1<<7)
#define BD_DATA01_MASK     (1<<6)
#define BD_KEEP_MASK       (1<<5)
#define BD_NINC_MASK       (1<<4)
#define BD_DTS_MASK        (1<<3)
#define BD_STALL_MASK      (1<<2)

#define TX    1
#define RX    0

#define EP0_BDT_IDX(dir, odd) (((2 * dir) + (1 * odd)))

#define SETUP_TOKEN    0x0D
#define IN_TOKEN       0x09
#define OUT_TOKEN      0x01

// for each endpt: 8 bytes
struct BDT {
    uint8_t   info;       // BD[0:7]
    uint8_t   dummy;      // RSVD: BD[8:15]
    uint16_t  byte_count; // BD[16:32]
    uint32_t  address;    // Addr
    void setBuffer(uint8_t* buf, int size) {
        address = (uint32_t)buf;
        byte_count = size;
    }
    uint8_t getStatus() {
        return (info>>2)&0x0f;
    }    
};

__attribute__((__aligned__(512))) BDT bdt[64];

USBHALHost* USBHALHost::instHost;

USBHALHost::USBHALHost() {
    instHost = this;
    memset(rx_data01, DATA1, sizeof(rx_data01));
    memset(tx_data01, DATA1, sizeof(tx_data01));
}

void USBHALHost::init() {
    // Disable IRQ
    NVIC_DisableIRQ(USB0_IRQn);

    // choose usb src as PLL
    SIM->SOPT2 |= (SIM_SOPT2_USBSRC_MASK | SIM_SOPT2_PLLFLLSEL_MASK);

    // enable OTG clock
    SIM->SCGC4 |= SIM_SCGC4_USBOTG_MASK;

    // USB Module Configuration
    // Reset USB Module
    USB0->USBTRC0 |= USB_USBTRC0_USBRESET_MASK;
    while(USB0->USBTRC0 & USB_USBTRC0_USBRESET_MASK);

    // Clear interrupt flag
    USB0->ISTAT = 0xff;

    // Set BDT Base Register
    USB0->BDTPAGE1=(uint8_t)((uint32_t)bdt>>8);
    USB0->BDTPAGE2=(uint8_t)((uint32_t)bdt>>16);
    USB0->BDTPAGE3=(uint8_t)((uint32_t)bdt>>24);

    // Set SOF threshold
    USB0->SOFTHLD = USB_SOFTHLD_CNT(1);

    // pulldown D+ and D-
    USB0->USBCTRL = USB_USBCTRL_PDE_MASK;

    USB0->USBTRC0 |= 0x40;

    // Host mode
    USB0->CTL |= USB_CTL_HOSTMODEEN_MASK;
    // Desable SOF packet generation
    USB0->CTL &= ~USB_CTL_USBENSOFEN_MASK;

    NVIC_SetVector(USB0_IRQn, (uint32_t)_usbisr);
    NVIC_EnableIRQ(USB0_IRQn);

    wait_attach();

    for(int retry = 2; retry > 0; retry--) {
        // Enable RESET
        USB0->CTL |= USB_CTL_RESET_MASK;
        wait_ms(500);
        USB0->CTL &= ~USB_CTL_RESET_MASK;
    
        // Enable SOF
        USB0->CTL |= USB_CTL_USBENSOFEN_MASK;
        wait_ms(100);

        // token transfer initialize
        tx_ptr = ODD;
        rx_ptr = ODD;
        USB0->INTEN |= USB_INTEN_TOKDNEEN_MASK;

        if (enumeration()) {
            break;
        }
        USB_DBG("retry=%d", retry);
        USB_TEST_ASSERT(retry > 1);
    }
}

void USBHALHost::wait_attach() {
    attach_done = false;
    USB0->INTEN = USB_INTEN_ATTACHEN_MASK;
    while(!attach_done);
    wait_ms(100);
    USB_TEST_ASSERT_FALSE(USB0->CTL & USB_CTL_SE0_MASK);
    lowSpeed = (USB0->CTL & USB_CTL_JSTATE_MASK) ? false : true;
    if (lowSpeed) { // low speed
        USB0->ENDPOINT[0].ENDPT |= USB_ENDPT_HOSTWOHUB_MASK;
    }
    USB_DBG("lowSpeed=%d", lowSpeed);
}

void USBHALHost::setAddr(int _addr) {
    USB0->ADDR = (lowSpeed ? USB_ADDR_LSEN_MASK : 0x00) | USB_ADDR_ADDR(_addr);
}

void USBHALHost::setEndpoint(bool use_retry) {
    USB0->ENDPOINT[0].ENDPT = (lowSpeed ? USB_ENDPT_HOSTWOHUB_MASK : 0x00)|
                              USB_ENDPT_EPCTLDIS_MASK|
                              (use_retry ? 0x00 : USB_ENDPT_RETRYDIS_MASK)|
                              USB_ENDPT_EPRXEN_MASK|
                              USB_ENDPT_EPTXEN_MASK|
                              USB_ENDPT_EPHSHK_MASK;
}

int USBHALHost::token_setup(SETUP_PACKET* setup, uint16_t wLength) {
    int retry = 0;
    do {
        token_ready();
        USB0->ENDPOINT[0].ENDPT = (lowSpeed ? USB_ENDPT_HOSTWOHUB_MASK : 0x00) |
                                  USB_ENDPT_RETRYDIS_MASK|
                                  USB_ENDPT_EPRXEN_MASK|
                                  USB_ENDPT_EPTXEN_MASK|
                                  USB_ENDPT_EPHSHK_MASK;
        CTASSERT(sizeof(SETUP_PACKET) == 8);
        setup->wLength = wLength;
        int idx = EP0_BDT_IDX(TX, tx_ptr);
        bdt[idx].setBuffer((uint8_t*)setup, sizeof(SETUP_PACKET));
        bdt[idx].info = BD_OWN_MASK |
                        BD_DTS_MASK; // always data0
        token_done = false;
        USB0->TOKEN = USB_TOKEN_TOKENPID(SETUP_TOKEN)|USB_TOKEN_TOKENENDPT(0);
        while(!token_done);
        LastStatus = bdt[idx].getStatus();
        if (LastStatus == ACK) {
            if (retry > 0) {
                USB_DBG("retry=%d %02x", retry, prev_LastStatus);
            }
            return ACK;
        }
        wait_ms(1);
        prev_LastStatus = LastStatus;
        //USB_DBG("retry=%d %02x", retry, prev_LastStatus);
    }while(retry++ < 10);
    return LastStatus;
}

int USBHALHost::token_in(uint8_t ep, uint8_t* data, int size, int retryLimit) {
    USB_TEST_ASSERT(ep < sizeof(rx_data01));
    for(int retry = 0;; retry++) {
        token_ready();
        int idx = EP0_BDT_IDX(RX, rx_ptr);
        bdt[idx].setBuffer(data, size);
        bdt[idx].info = BD_OWN_MASK|
                        BD_DTS_MASK|
                        ((rx_data01[ep] == DATA1) ? BD_DATA01_MASK : 0);
        token_done = false;
        USB0->TOKEN = USB_TOKEN_TOKENPID(IN_TOKEN)|USB_TOKEN_TOKENENDPT(ep);
        while(!token_done);
        LastStatus = bdt[idx].getStatus();
        int len = bdt[idx].byte_count;
        if (LastStatus == DATA0 || LastStatus == DATA1) {
            rx_data01[ep] = LastStatus == DATA0 ? DATA1 : DATA0;
            if (retry > 0) {
                USB_DBG("len=%d retry=%d %02x", len, retry, prev_LastStatus);
            }
            return len;
        }
        if (++retry >= retryLimit) {
            return -1;
        }
        wait_ms(100);
        prev_LastStatus = LastStatus;
    }
}

int USBHALHost::token_out(uint8_t ep, const uint8_t* data, int size) {
    USB_TEST_ASSERT(ep < sizeof(tx_data01));
    int retry = 0;
    do {
        token_ready();
        int idx = EP0_BDT_IDX(TX, tx_ptr);
        bdt[idx].info = BD_OWN_MASK|
                        BD_DTS_MASK|
                       ((tx_data01[ep] == DATA1) ? BD_DATA01_MASK : 0);
        bdt[idx].setBuffer((uint8_t*)data, size);
        token_done = false;
        USB0->TOKEN = USB_TOKEN_TOKENPID(OUT_TOKEN)|USB_TOKEN_TOKENENDPT(ep);
        while(!token_done);
        LastStatus = bdt[idx].getStatus();
        if (LastStatus == ACK) {
            tx_data01[ep] = (tx_data01[ep] == DATA0) ? DATA1 : DATA0;
            if (retry > 0) {
                USB_DBG("retry=%d %02x", retry, prev_LastStatus);
            }
            return bdt[idx].byte_count;
        }
        wait_ms(10);
        prev_LastStatus = LastStatus;
    } while(retry++ < 10);
    return -1;
}

void USBHALHost::token_ready() {
    while(USB0->CTL & USB_CTL_TXSUSPENDTOKENBUSY_MASK) { // TOKEN_BUSY ?
        wait_ms(1);
    }
    USB0->ISTAT |= USB_ISTAT_SOFTOK_MASK; // Clear SOF
    while (!(USB0->ISTAT & USB_ISTAT_SOFTOK_MASK));
    USB0->SOFTHLD = 0; // this is needed as without this you can get errors
    USB0->ISTAT |= USB_ISTAT_SOFTOK_MASK; // clear SOF
}

void USBHALHost::_usbisr(void) {
    if (instHost) {
        instHost->UsbIrqhandler();
    }
}

void USBHALHost::UsbIrqhandler() {
    uint8_t istat = USB0->ISTAT;
    if (istat & USB_ISTAT_TOKDNE_MASK) {
        uint8_t stat = USB0->STAT;
        ODD_EVEN next_ptr = (stat & USB_STAT_ODD_MASK) ? ODD : EVEN;
        if (stat & USB_STAT_TX_MASK) {
            tx_ptr = next_ptr;
        } else {
            rx_ptr = next_ptr;
        }
        token_done = true;
    }
    if (istat & USB_ISTAT_ATTACH_MASK) {
        USB0->INTEN &= ~USB_INTEN_ATTACHEN_MASK;
        attach_done = true;
    }
    USB0->ISTAT = istat; // clear
}

void debug_hex(uint8_t* buf, int size) {
    for(int i = 0; i < size; i++) {
        fprintf(stderr, "%02x ", buf[i]);
        if (i%16 == 15) {
            fprintf(stderr, "\r\n");
        }
    }
    fprintf(stderr, "\r\n");
}