usb: work-in-progress for USB development

Signed-off-by: Sean Cross <sean@xobs.io>

src/main.c

@@ -23,7 +23,12 @@ void isr(void)
 static void rv_putchar(void *ignored, char c)
 {
     (void)ignored;
+    if (c == '\n')
+        uart_write('\r');
+    if (c == '\r')
+        return;
     uart_write(c);
+    // uart_sync();
 }
 
 static void init(void)
@@ -36,37 +41,21 @@ static void init(void)
     time_init();
 }
 
+static const char *usb_hw_api(void) {
 #ifdef CSR_USB_EP_0_OUT_EV_PENDING_ADDR
+    return "epfifo";
 #else
-static void get_print_status(void)
+#ifdef CSR_USB_OBUF_EMPTY_ADDR
-{
+    return "rawfifo";
-    static int loops;
+#else
-    uint32_t obe = usb_obuf_empty_read();
+#ifdef CSR_USB_WHATEVER
-    uint8_t obufbuf[128];
+    return "whatever";
-    int obufbuf_cnt = 0;
+#else
-    loops++;
+    return "unrecognized hw api";
-
+#endif /* CSR_USB_WHATEVER */
-    while (!usb_obuf_empty_read()) {
+#endif /* CSR_USB_OBUF_EMPTY_ADDR */
-        uint32_t obh = usb_obuf_head_read();
+#endif /* CSR_USB_EP_0_OUT_EV_PENDING_ADDR */
-        obufbuf[obufbuf_cnt++] = obh;
-        usb_obuf_head_write(1);
 }
-    if (obufbuf_cnt) {
-        int i;
-        printf("i: %d  b: %d  --", loops, obufbuf_cnt);//obe: %d  obh: %02x\n", i, obe, obh);
-        for (i = 0; i < obufbuf_cnt; i++) {
-            printf(" %02x", obufbuf[i]);
-        }
-        printf("\n");
-    }
-    // if (!obe) {
-    //     uint32_t obh = usb_obuf_head_read();
-    //     usb_obuf_head_write(1);
-    //     if (i < 300)
-    //         printf("i: %8d  obe: %d  obh: %02x\n", i, obe, obh);
-    // }
-}
-#endif
 
 int main(int argc, char **argv)
 {
@@ -74,20 +63,26 @@ int main(int argc, char **argv)
     (void)argv;
 
     init();
-    usb_pullup_out_write(1);
-    usb_ep_0_out_ev_pending_write((1 << 1));
-    if (usb_ep_0_out_ev_pending_read() & (1 << 1))
-        usb_isr();
 
-    printf("Hello, world!\n");
+    printf("\n\nUSB API: %s\n", usb_hw_api());
+    // printf("Press any key to enable USB...\n");
  
+    usb_print_status();
+    // uart_read();
+    printf("Enabling USB\n");
+    usb_connect();
+    printf("USB enabled, waiting for packet...\n");
+    // usb_wait();
+    usb_print_status();
+    int last = 0;
     while (1)
     {
-        if (usb_ep_0_out_ev_pending_read() & (1 << 1))
+        if (usb_irq_happened() != last) {
-            usb_isr();
+            last = usb_irq_happened();
-        // elapsed(&last_event, 1000);
+            printf("USB %d IRQ happened\n", last);
-
+        }
-        // get_print_status();
+        // printf("x");
+        usb_print_status();
     }
     return 0;
 }

src/usb-epfifo.c

@@ -1,30 +1,19 @@
 #include <grainuum.h>
 #include <usb.h>
+#include <irq.h>
 #include <generated/csr.h>
 #include <string.h>
 #include <printf.h>
+#include <uart.h>
+
+#ifdef CSR_USB_EP_0_OUT_EV_PENDING_ADDR
 
 #define NUM_BUFFERS 4
 #define BUFFER_SIZE 64
 #define EP_INTERVAL_MS 6
 
-static struct GrainuumUSB usb;
+//static struct GrainuumUSB usb;
-static uint8_t usb_buf[67];
+//static uint8_t usb_buf[67];
-
-static uint32_t rx_buffer[NUM_BUFFERS][BUFFER_SIZE / sizeof(uint32_t)];
-static uint8_t rx_buffer_head;
-static uint8_t rx_buffer_tail;
-
-static uint32_t rx_buffer_queries = 0;
-
-
-static void set_usb_config_num(struct GrainuumUSB *usb, int configNum)
-{
-  (void)usb;
-  (void)configNum;
-  ;
-}
-
 static const uint8_t hid_report_descriptor[] = {
     0x06, 0x00, 0xFF, // (GLOBAL) USAGE_PAGE         0xFF00 Vendor-defined
     0x09, 0x00,       // (LOCAL)  USAGE              0xFF000000
@@ -114,6 +103,255 @@ static const struct usb_configuration_descriptor configuration_descriptor = {
     },
 };
 
+enum epfifo_response {
+    EPF_ACK = 0,
+    EPF_NAK = 1,
+    EPF_NONE = 2,
+    EPF_STALL = 3,
+};
+
+#define USB_EV_ERROR 1
+#define USB_EV_PACKET 2
+
+void usb_connect(void) {
+    usb_pullup_out_write(1);
+
+    // By default, it wants to respond with NAK.
+    usb_ep_0_out_respond_write(EPF_ACK);
+    usb_ep_0_in_respond_write(EPF_NAK);
+
+	usb_ep_0_out_ev_pending_write(usb_ep_0_out_ev_enable_read());
+	usb_ep_0_in_ev_pending_write(usb_ep_0_in_ev_pending_read());
+	usb_ep_0_out_ev_enable_write(USB_EV_PACKET | USB_EV_ERROR);
+    usb_ep_0_in_ev_enable_write(USB_EV_PACKET | USB_EV_ERROR);
+
+	irq_setmask(irq_getmask() | (1 << USB_INTERRUPT));
+}
+
+void usb_init(void) {
+    return;
+}
+
+volatile int irq_count = 0;
+
+#define EP0OUT_BUFFERS 64
+static uint8_t usb_ep0out_buffer[EP0OUT_BUFFERS][128];
+uint8_t usb_ep0out_wr_ptr;
+uint8_t usb_ep0out_rd_ptr;
+int descriptor_ptr;
+int max_byte_length = 8;
+
+static const uint8_t *current_data;
+static int current_length;
+static int current_offset;
+static int current_to_send;
+
+static int maybe_send_more_data(int epnum) {
+    (void)epnum;
+    // Don't allow requeueing
+    if (usb_ep_0_in_respond_read() != EPF_NAK)
+        return -1;
+    // if (!usb_ep_0_in_ibuf_empty_read())
+        // return -2;
+
+    int this_offset;
+    current_to_send = current_length - current_offset;
+    if (current_to_send > max_byte_length)
+        current_to_send = max_byte_length;
+
+    for (this_offset = current_offset; this_offset < current_offset + current_to_send; this_offset++) {
+        usb_ep_0_in_ibuf_head_write(current_data[this_offset]);
+    }
+    usb_ep_0_in_respond_write(EPF_ACK);
+    return 0;
+}
+
+static int send_data(int epnum, const void *data, int total_count) {
+    // Don't allow requeueing
+    if (usb_ep_0_in_respond_read() != EPF_NAK)
+        return -1;
+    current_data = (uint8_t *)data;
+    current_length = total_count;
+    current_offset = 0;
+    maybe_send_more_data(epnum);
+    return 0;
+}
+
+void usb_isr(void) {
+    irq_count++;
+
+    uint8_t ep0o_pending = usb_ep_0_out_ev_pending_read();
+    uint8_t ep0i_pending = usb_ep_0_in_ev_pending_read();
+
+    if (ep0o_pending) {
+        int byte_count = 0;
+        uint8_t *obuf = usb_ep0out_buffer[usb_ep0out_wr_ptr];
+        while (1) {
+            if (usb_ep_0_out_obuf_empty_read())
+                break;
+            obuf[++byte_count] = usb_ep_0_out_obuf_head_read();
+            usb_ep_0_out_obuf_head_write(0);
+        }
+        usb_ep_0_out_ev_pending_write(ep0o_pending);
+
+        if (byte_count) {
+            obuf[0] = byte_count;
+            usb_ep0out_wr_ptr = (usb_ep0out_wr_ptr + 1) & (EP0OUT_BUFFERS-1);
+
+            // usb_ep_0_in_dtb_write(1);
+            send_data(0, &device_descriptor, sizeof(device_descriptor));
+        }
+        else {
+            usb_ep_0_out_respond_write(EPF_ACK);
+        }
+    }
+
+    if (ep0i_pending) {
+        /*
+        uint8_t *descriptor = (uint8_t *)&device_descriptor;
+        if (descriptor_ptr < 0) {
+            usb_ep_0_in_respond_write(EPF_NAK);
+        }
+        else if (descriptor_ptr >= sizeof(device_descriptor)) {
+            descriptor_ptr = -1;
+            usb_ep_0_in_respond_write(EPF_ACK);
+        }
+        else {
+            usb_ep_0_in_respond_write(EPF_NAK);
+            for (descriptor_ptr; descriptor_ptr < sizeof(device_descriptor); descriptor_ptr++) {
+                usb_ep_0_in_ibuf_head_write(descriptor[descriptor_ptr]);
+            }
+            usb_ep_0_in_respond_write(EPF_ACK);
+        }
+        */
+        usb_ep_0_in_respond_write(EPF_NAK);
+        current_offset += current_to_send;
+        maybe_send_more_data(0);
+        usb_ep_0_in_ev_pending_write(ep0i_pending);
+    }
+
+    return;
+}
+
+void usb_wait(void) {
+    while (!irq_count)
+        ;
+}
+
+int usb_irq_happened(void) {
+  return irq_count;
+}
+
+static const char hex[] = "0123456789abcdef";
+void usb_print_status(void) {
+    /*
+    printf("EP0_OUT  Status:     %02x\n", usb_ep_0_out_ev_status_read());
+    printf("EP0_OUT  Pending:    %02x\n", usb_ep_0_out_ev_pending_read());
+    printf("EP0_OUT  Enable:     %02x\n", usb_ep_0_out_ev_enable_read());
+    printf("EP0_OUT  Last Tok:   %02x\n", usb_ep_0_out_last_tok_read());
+    printf("EP0_OUT  Respond:    %02x\n", usb_ep_0_out_respond_read());
+    printf("EP0_OUT  DTB:        %02x\n", usb_ep_0_out_dtb_read());
+    printf("EP0_OUT  OBUF Head:  %02x\n", usb_ep_0_out_obuf_head_read());
+    printf("EP0_OUT  OBUF Empty: %02x\n", usb_ep_0_out_obuf_empty_read());
+    printf("EP0_IN   Status:     %02x\n", usb_ep_0_in_ev_status_read());
+    printf("EP0_IN   Pending:    %02x\n", usb_ep_0_in_ev_pending_read());
+    printf("EP0_IN   Enable:     %02x\n", usb_ep_0_in_ev_enable_read());
+    printf("EP0_IN   Last Tok:   %02x\n", usb_ep_0_in_last_tok_read());
+    printf("EP0_IN   Respond:    %02x\n", usb_ep_0_in_respond_read());
+    printf("EP0_IN   DTB:        %02x\n", usb_ep_0_in_dtb_read());
+    printf("EP0_IN   IBUF Head:  %02x\n", usb_ep_0_in_ibuf_head_read());
+    printf("EP0_IN   IBUF Empty: %02x\n", usb_ep_0_in_ibuf_empty_read());
+    */
+    while (usb_ep0out_rd_ptr != usb_ep0out_wr_ptr) {
+        // printf("for (this_offset = current_offset; this_offset < this_offset + current_to_send; this_offset++) {\n");
+        // printf("for (this_offset = %d; this_offset < %d; %d++) {\n", current_offset, this_offset, this_offset + current_to_send, this_offset);
+        printf("current_data: 0x%08x\n", current_data);
+        printf("current_length: %d\n", current_length);
+        printf("current_offset: %d\n", current_offset);
+        printf("current_to_send: %d\n", current_to_send);
+        uint8_t *obuf = usb_ep0out_buffer[usb_ep0out_rd_ptr];
+        uint8_t cnt = obuf[0];
+        unsigned int i;
+        if (cnt) {
+            for (i = 0; i < cnt; i++) {
+                uart_write(' ');
+                uart_write(hex[(obuf[i+1] >> 4) & 0xf]);
+                uart_write(hex[obuf[i+1] & (0xf)]);
+                // printf(" %02x", obufbuf[i]);
+            }
+            uart_write('\r');
+            uart_write('\n');
+        }
+        // printf("\n");
+        usb_ep0out_rd_ptr = (usb_ep0out_rd_ptr + 1) & (EP0OUT_BUFFERS-1);
+    }
+}
+
+
+// static inline unsigned char usb_pullup_out_read(void);
+// static inline void usb_pullup_out_write(unsigned char value);
+
+
+// static inline unsigned char usb_ep_0_out_ev_status_read(void);
+// static inline void usb_ep_0_out_ev_status_write(unsigned char value);
+
+// static inline unsigned char usb_ep_0_out_ev_pending_read(void);
+// static inline void usb_ep_0_out_ev_pending_write(unsigned char value);
+
+// static inline unsigned char usb_ep_0_out_ev_enable_read(void);
+// static inline void usb_ep_0_out_ev_enable_write(unsigned char value);
+
+// static inline unsigned char usb_ep_0_out_last_tok_read(void);
+
+// static inline unsigned char usb_ep_0_out_respond_read(void);
+// static inline void usb_ep_0_out_respond_write(unsigned char value);
+
+// static inline unsigned char usb_ep_0_out_dtb_read(void);
+// static inline void usb_ep_0_out_dtb_write(unsigned char value);
+
+// static inline unsigned char usb_ep_0_out_obuf_head_read(void);
+// static inline void usb_ep_0_out_obuf_head_write(unsigned char value);
+
+// static inline unsigned char usb_ep_0_out_obuf_empty_read(void);
+
+
+// static inline unsigned char usb_ep_0_in_ev_status_read(void);
+// static inline void usb_ep_0_in_ev_status_write(unsigned char value);
+
+// static inline unsigned char usb_ep_0_in_ev_pending_read(void);
+// static inline void usb_ep_0_in_ev_pending_write(unsigned char value);
+
+// static inline unsigned char usb_ep_0_in_ev_enable_read(void);
+// static inline void usb_ep_0_in_ev_enable_write(unsigned char value);
+
+// static inline unsigned char usb_ep_0_in_last_tok_read(void);
+
+// static inline unsigned char usb_ep_0_in_respond_read(void);
+// static inline void usb_ep_0_in_respond_write(unsigned char value);
+
+// static inline unsigned char usb_ep_0_in_dtb_read(void);
+// static inline void usb_ep_0_in_dtb_write(unsigned char value);
+
+// static inline unsigned char usb_ep_0_in_ibuf_head_read(void);
+// static inline void usb_ep_0_in_ibuf_head_write(unsigned char value);
+
+// static inline unsigned char usb_ep_0_in_ibuf_empty_read(void);
+  
+
+#if 0
+static uint32_t rx_buffer[NUM_BUFFERS][BUFFER_SIZE / sizeof(uint32_t)];
+static uint8_t rx_buffer_head;
+static uint8_t rx_buffer_tail;
+
+static uint32_t rx_buffer_queries = 0;
+static void set_usb_config_num(struct GrainuumUSB *usb, int configNum)
+{
+  (void)usb;
+  (void)configNum;
+  ;
+}
+
+
 #define USB_STR_BUF_LEN 64
 
 static uint32_t str_buf_storage[USB_STR_BUF_LEN / sizeof(uint32_t)];
@@ -307,30 +545,32 @@ static struct GrainuumConfig cfg = {
     .setConfigNum = set_usb_config_num,
 };
 
-void usb_isr(void) {
+// void usb_isr(void) {
-    grainuumCaptureI(&usb, usb_buf);
+//     // grainuumCaptureI(&usb, usb_buf);
-    return;
+//     return;
-}
+// }
 
-void usb_init(void) {
+// void usb_init(void) {
-    grainuumInit(&usb, &cfg);
+//     // grainuumInit(&usb, &cfg);
-    grainuumConnect(&usb);
+//     // grainuumConnect(&usb);
-    return;
+//     return;
-}
+// }
 
 void usbPhyWriteI(const struct GrainuumUSB *usb, const void *buffer, uint32_t size) {
-    (void)usb;
+    // (void)usb;
-    const uint8_t *ubuffer = (const uint8_t *)buffer;
+    // const uint8_t *ubuffer = (const uint8_t *)buffer;
-    uint32_t i = 0;
+    // uint32_t i = 0;
-    while (i < size)
+    // while (i < size)
-        usb_obuf_head_write(ubuffer[i]);
+    //     usb_obuf_head_write(ubuffer[i]);
 }
 
 int usbPhyReadI(const struct GrainuumUSB *usb, uint8_t *samples) {
     (void)usb;
     int count = 0;
-    while (!usb_ibuf_empty_read()) {
+    // while (!usb_ibuf_empty_read()) {
-        samples[count++] = usb_ibuf_head_read();
+        // samples[count++] = usb_ibuf_head_read();
-    }
+    // }
     return count;
 }
+#endif
+#endif /* CSR_USB_EP_0_OUT_EV_PENDING_ADDR */

src/usb-rawfifo.c

@@ -0,0 +1,116 @@
+#include <usb.h>
+#include <irq.h>
+#include <generated/csr.h>
+#include <string.h>
+#include <printf.h>
+#include <uart.h>
+
+#ifdef CSR_USB_OBUF_EMPTY_ADDR
+
+static inline unsigned char usb_obuf_head_read(void);
+static inline void usb_obuf_head_write(unsigned char value);
+
+static inline unsigned char usb_obuf_empty_read(void);
+
+static inline unsigned char usb_arm_read(void);
+static inline void usb_arm_write(unsigned char value);
+
+static inline unsigned char usb_ibuf_head_read(void);
+static inline void usb_ibuf_head_write(unsigned char value);
+
+static inline unsigned char usb_ibuf_empty_read(void);
+
+static inline unsigned char usb_pullup_out_read(void);
+static inline void usb_pullup_out_write(unsigned char value);
+
+static inline unsigned char usb_ev_status_read(void);
+static inline void usb_ev_status_write(unsigned char value);
+
+static inline unsigned char usb_ev_pending_read(void);
+static inline void usb_ev_pending_write(unsigned char value);
+
+static inline unsigned char usb_ev_enable_read(void);
+static inline void usb_ev_enable_write(unsigned char value);
+    
+static const char hex[] = "0123456789abcdef";
+
+uint8_t usb_ep0out_wr_ptr;
+uint8_t usb_ep0out_rd_ptr;
+#define EP0OUT_BUFFERS 64
+static uint8_t usb_ep0out_buffer[EP0OUT_BUFFERS][128];
+void usb_print_status(void)
+{
+    static int loops;
+    loops++;
+
+    while (usb_ep0out_rd_ptr != usb_ep0out_wr_ptr) {
+        uint8_t *obuf = usb_ep0out_buffer[usb_ep0out_rd_ptr];
+        uint8_t cnt = obuf[0];
+        unsigned int i;
+        if (cnt) {
+            for (i = 0; i < cnt; i++) {
+                uart_write(' ');
+                uart_write(hex[(obuf[i+1] >> 4) & 0xf]);
+                uart_write(hex[obuf[i+1] & (0xf)]);
+                // printf(" %02x", obufbuf[i]);
+            }
+            uart_write('\r');
+            uart_write('\n');
+        }
+        // printf("\n");
+        usb_ep0out_rd_ptr = (usb_ep0out_rd_ptr + 1) & (EP0OUT_BUFFERS-1);
+    }
+    // if (!obe) {
+    //     uint32_t obh = usb_obuf_head_read();
+    //     usb_obuf_head_write(1);
+    //     if (i < 300)
+    //         printf("i: %8d  obe: %d  obh: %02x\n", i, obe, obh);
+    // }
+}
+
+int irq_happened;
+
+void usb_init(void) {
+    return;
+}
+
+void usb_isr(void) {
+    uint8_t pending = usb_ev_pending_read();
+
+    // Advance the obuf head, which will reset the obuf_empty bit
+    if (pending & 1) {
+        int byte_count = 0;
+        uint8_t *obuf = usb_ep0out_buffer[usb_ep0out_wr_ptr];
+        while (1) {
+            if (usb_obuf_empty_read())
+                break;
+            obuf[++byte_count] = usb_obuf_head_read();
+            usb_obuf_head_write(0);
+        }
+        usb_ev_pending_write(1);
+        obuf[0] = byte_count;
+        usb_ep0out_wr_ptr = (usb_ep0out_wr_ptr + 1) & (EP0OUT_BUFFERS-1);
+    }
+
+    return;
+}
+
+void usb_connect(void) {
+    usb_pullup_out_write(1);
+
+    usb_ev_pending_write(usb_ev_pending_read());
+    usb_ev_enable_write(0xff);
+
+	irq_setmask(irq_getmask() | (1 << USB_INTERRUPT));
+}
+
+void usb_wait(void) {
+    while (!irq_happened)
+        ;
+}
+
+int usb_irq_happened(void) {
+  return irq_happened;
+}
+
+#endif /* CSR_USB_OBUF_EMPTY_ADDR */