samd/mphalport: Use shared/tinyusb cdc functions.

Signed-off-by: Andrew Leech <andrew@alelec.net>

ports/samd/mphalport.c

@@ -30,6 +30,7 @@
 #include "py/stream.h"
 #include "shared/runtime/interrupt_char.h"
 #include "shared/tinyusb/mp_usbd.h"
+#include "shared/tinyusb/mp_cdc_common.h"
 #include "extmod/misc.h"
 #include "samd_soc.h"
 #include "tusb.h"
@@ -51,48 +52,6 @@ ringbuf_t stdin_ringbuf = { stdin_ringbuf_array, sizeof(stdin_ringbuf_array), 0,
         mp_usbd_task(); \
     } while (0)
 
-uint8_t cdc_itf_pending; // keep track of cdc interfaces which need attention to poll
-
-void poll_cdc_interfaces(void) {
-    // any CDC interfaces left to poll?
-    if (cdc_itf_pending && ringbuf_free(&stdin_ringbuf)) {
-        for (uint8_t itf = 0; itf < 8; ++itf) {
-            if (cdc_itf_pending & (1 << itf)) {
-                tud_cdc_rx_cb(itf);
-                if (!cdc_itf_pending) {
-                    break;
-                }
-            }
-        }
-    }
-}
-
-void tud_cdc_rx_cb(uint8_t itf) {
-    // consume pending USB data immediately to free usb buffer and keep the endpoint from stalling.
-    // in case the ringbuffer is full, mark the CDC interface that need attention later on for polling
-    cdc_itf_pending &= ~(1 << itf);
-    for (uint32_t bytes_avail = tud_cdc_n_available(itf); bytes_avail > 0; --bytes_avail) {
-        if (ringbuf_free(&stdin_ringbuf)) {
-            int data_char = tud_cdc_read_char();
-            #if MICROPY_KBD_EXCEPTION
-            if (data_char == mp_interrupt_char) {
-                // Clear the ring buffer
-                stdin_ringbuf.iget = stdin_ringbuf.iput = 0;
-                // and stop
-                mp_sched_keyboard_interrupt();
-            } else {
-                ringbuf_put(&stdin_ringbuf, data_char);
-            }
-            #else
-            ringbuf_put(&stdin_ringbuf, data_char);
-            #endif
-        } else {
-            cdc_itf_pending |= (1 << itf);
-            return;
-        }
-    }
-}
-
 void mp_hal_set_pin_mux(mp_hal_pin_obj_t pin, uint8_t mux) {
     int pin_grp = pin / 32;
     int port_grp = (pin % 32) / 2;
@@ -166,7 +125,7 @@ uint64_t mp_hal_ticks_us_64(void) {
 uintptr_t mp_hal_stdio_poll(uintptr_t poll_flags) {
     uintptr_t ret = 0;
 
-    poll_cdc_interfaces();
+    tud_cdc_poll_interfaces();
     if ((poll_flags & MP_STREAM_POLL_RD) && ringbuf_peek(&stdin_ringbuf) != -1) {
         ret |= MP_STREAM_POLL_RD;
     }
@@ -184,7 +143,7 @@ uintptr_t mp_hal_stdio_poll(uintptr_t poll_flags) {
 int mp_hal_stdin_rx_chr(void) {
     for (;;) {
 
-        poll_cdc_interfaces();
+        tud_cdc_poll_interfaces();
         int c = ringbuf_get(&stdin_ringbuf);
         if (c != -1) {
             return c;
@@ -203,28 +162,10 @@ int mp_hal_stdin_rx_chr(void) {
 mp_uint_t mp_hal_stdout_tx_strn(const char *str, mp_uint_t len) {
     mp_uint_t ret = len;
     bool did_write = false;
-    if (tud_cdc_connected()) {
-        size_t i = 0;
-        while (i < len) {
-            uint32_t n = len - i;
-            if (n > CFG_TUD_CDC_EP_BUFSIZE) {
-                n = CFG_TUD_CDC_EP_BUFSIZE;
-            }
-            int timeout = 0;
-            // Wait with a max of USC_CDC_TIMEOUT ms
-            while (n > tud_cdc_write_available() && timeout++ < MICROPY_HW_USB_CDC_TX_TIMEOUT) {
-                MICROPY_EVENT_POLL_HOOK_WITH_USB;
-            }
-            if (timeout >= MICROPY_HW_USB_CDC_TX_TIMEOUT) {
-                ret = i;
-                break;
-            }
-            uint32_t n2 = tud_cdc_write(str + i, n);
-            tud_cdc_write_flush();
-            i += n2;
-        }
-        ret = MIN(i, ret);
+    mp_uint_t cdc_res = tud_cdc_tx_strn(str, len);
+    if (cdc_res > 0) {
         did_write = true;
+        ret = MIN(cdc_res, ret);
     }
     #if MICROPY_PY_OS_DUPTERM
     int dupterm_res = mp_os_dupterm_tx_strn(str, len);