1 files changed, 297 insertions, 0 deletions
diff --git a/circuitpython/supervisor/shared/serial.c b/circuitpython/supervisor/shared/serial.c
new file mode 100644
index 0000000..af90fce
--- /dev/null
+++ b/circuitpython/supervisor/shared/serial.c
@@ -0,0 +1,297 @@
+/*
+ * This file is part of the MicroPython project, http://micropython.org/
+ *
+ * The MIT License (MIT)
+ *
+ * Copyright (c) 2017 Scott Shawcroft for Adafruit Industries
+ *
+ * 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.
+ */
+
+#include <stdarg.h>
+#include <string.h>
+
+#include "py/mpconfig.h"
+
+#include "supervisor/shared/cpu.h"
+#include "supervisor/shared/display.h"
+#include "shared-bindings/terminalio/Terminal.h"
+#include "supervisor/serial.h"
+#include "supervisor/usb.h"
+#include "shared-bindings/microcontroller/Pin.h"
+#include "shared-module/usb_cdc/__init__.h"
+
+#if CIRCUITPY_SERIAL_BLE
+#include "supervisor/shared/bluetooth/serial.h"
+#endif
+
+#if CIRCUITPY_USB
+#include "tusb.h"
+#endif
+
+/*
+ * Note: DEBUG_UART currently only works on STM32 and nRF.
+ * Enabling on another platform will cause a crash.
+ */
+
+#if defined(CIRCUITPY_DEBUG_UART_TX) || defined(CIRCUITPY_DEBUG_UART_RX)
+#include "py/mpprint.h"
+#include "shared-bindings/busio/UART.h"
+busio_uart_obj_t debug_uart;
+byte buf_array[64];
+#endif
+
+#if CIRCUITPY_USB_VENDOR
+bool tud_vendor_connected(void);
+#endif
+
+#if defined(CIRCUITPY_DEBUG_UART_TX)
+STATIC void debug_uart_print_strn(void *env, const char *str, size_t len) {
+    (void)env;
+    int uart_errcode;
+    common_hal_busio_uart_write(&debug_uart, (const uint8_t *)str, len, &uart_errcode);
+}
+
+const mp_print_t debug_uart_print = {NULL, debug_uart_print_strn};
+#endif
+
+int debug_uart_printf(const char *fmt, ...) {
+    #if defined(CIRCUITPY_DEBUG_UART_TX)
+    // Skip prints that occur before debug serial is started. It's better than
+    // crashing.
+    if (common_hal_busio_uart_deinited(&debug_uart)) {
+        return 0;
+    }
+    va_list ap;
+    va_start(ap, fmt);
+    int ret = mp_vprintf(&debug_uart_print, fmt, ap);
+    va_end(ap);
+    return ret;
+    #else
+    return 0;
+    #endif
+}
+
+MP_WEAK void port_serial_init(void) {
+}
+
+MP_WEAK bool port_serial_connected(void) {
+    return false;
+}
+
+MP_WEAK char port_serial_read(void) {
+    return -1;
+}
+
+MP_WEAK bool port_serial_bytes_available(void) {
+    return false;
+}
+
+MP_WEAK void port_serial_write_substring(const char *text, uint32_t length) {
+    (void)text;
+    (void)length;
+}
+
+void serial_early_init(void) {
+    #if defined(CIRCUITPY_DEBUG_UART_TX) || defined(CIRCUITPY_DEBUG_UART_RX)
+    debug_uart.base.type = &busio_uart_type;
+
+    #if defined(CIRCUITPY_DEBUG_UART_RX)
+    const mcu_pin_obj_t *rx = MP_OBJ_TO_PTR(CIRCUITPY_DEBUG_UART_RX);
+    #else
+    const mcu_pin_obj_t *rx = NULL;
+    #endif
+
+    #if defined(CIRCUITPY_DEBUG_UART_TX)
+    const mcu_pin_obj_t *tx = MP_OBJ_TO_PTR(CIRCUITPY_DEBUG_UART_TX);
+    #else
+    const mcu_pin_obj_t *tx = NULL;
+    #endif
+
+    common_hal_busio_uart_construct(&debug_uart, tx, rx, NULL, NULL, NULL,
+        false, 115200, 8, BUSIO_UART_PARITY_NONE, 1, 1.0f, 64,
+        buf_array, true);
+    common_hal_busio_uart_never_reset(&debug_uart);
+
+    // Do an initial print so that we can confirm the serial output is working.
+    debug_uart_printf("Serial debug setup\r\n");
+    #endif
+}
+
+void serial_init(void) {
+    port_serial_init();
+}
+
+bool serial_connected(void) {
+    #if CIRCUITPY_USB_VENDOR
+    if (tud_vendor_connected()) {
+        return true;
+    }
+    #endif
+
+    #if defined(CIRCUITPY_DEBUG_UART_TX) && defined(CIRCUITPY_DEBUG_UART_RX)
+    return true;
+    #endif
+
+    #if CIRCUITPY_SERIAL_BLE
+    if (ble_serial_connected()) {
+        return true;
+    }
+    #endif
+
+    #if CIRCUITPY_USB_CDC
+    if (usb_cdc_console_enabled() && tud_cdc_connected()) {
+        return true;
+    }
+    #elif CIRCUITPY_USB
+    if (tud_cdc_connected()) {
+        return true;
+    }
+    #endif
+
+    if (port_serial_connected()) {
+        return true;
+    }
+    return false;
+}
+
+char serial_read(void) {
+    #if CIRCUITPY_USB_VENDOR
+    if (tud_vendor_connected() && tud_vendor_available() > 0) {
+        char tiny_buffer;
+        tud_vendor_read(&tiny_buffer, 1);
+        return tiny_buffer;
+    }
+    #endif
+
+    #if defined(CIRCUITPY_DEBUG_UART_RX)
+    if (common_hal_busio_uart_rx_characters_available(&debug_uart)) {
+        int uart_errcode;
+        char text;
+        common_hal_busio_uart_read(&debug_uart, (uint8_t *)&text, 1, &uart_errcode);
+        return text;
+    }
+    #endif
+
+    #if CIRCUITPY_SERIAL_BLE
+    if (ble_serial_available() > 0) {
+        return ble_serial_read_char();
+    }
+    #endif
+
+    #if CIRCUITPY_USB_CDC
+    if (!usb_cdc_console_enabled()) {
+        return -1;
+    }
+    #endif
+    #if CIRCUITPY_USB
+    return (char)tud_cdc_read_char();
+    #endif
+
+    if (port_serial_bytes_available() > 0) {
+        return port_serial_read();
+    }
+    return -1;
+}
+
+bool serial_bytes_available(void) {
+    #if CIRCUITPY_USB_VENDOR
+    if (tud_vendor_connected() && tud_vendor_available() > 0) {
+        return true;
+    }
+    #endif
+
+    #if defined(CIRCUITPY_DEBUG_UART_RX)
+    if (common_hal_busio_uart_rx_characters_available(&debug_uart)) {
+        return true;
+    }
+    #endif
+
+    #if CIRCUITPY_SERIAL_BLE
+    if (ble_serial_available()) {
+        return true;
+    }
+    #endif
+
+    #if CIRCUITPY_USB_CDC
+    if (usb_cdc_console_enabled() && tud_cdc_available() > 0) {
+        return true;
+    }
+    #endif
+    #if CIRCUITPY_USB
+    if (tud_cdc_available() > 0) {
+        return true;
+    }
+    #endif
+
+    if (port_serial_bytes_available() > 0) {
+        return true;
+    }
+    return false;
+}
+
+void serial_write_substring(const char *text, uint32_t length) {
+    if (length == 0) {
+        return;
+    }
+    #if CIRCUITPY_TERMINALIO
+    int errcode;
+    common_hal_terminalio_terminal_write(&supervisor_terminal, (const uint8_t *)text, length, &errcode);
+    #endif
+
+    #if CIRCUITPY_USB_VENDOR
+    if (tud_vendor_connected()) {
+        tud_vendor_write(text, length);
+    }
+    #endif
+
+    #if defined(CIRCUITPY_DEBUG_UART_TX)
+    int uart_errcode;
+
+    common_hal_busio_uart_write(&debug_uart, (const uint8_t *)text, length, &uart_errcode);
+    #endif
+
+    #if CIRCUITPY_SERIAL_BLE
+    ble_serial_write(text, length);
+    #endif
+
+    #if CIRCUITPY_USB_CDC
+    if (!usb_cdc_console_enabled()) {
+        return;
+    }
+    #endif
+
+    #if CIRCUITPY_USB
+    uint32_t count = 0;
+    while (count < length && tud_cdc_connected()) {
+        count += tud_cdc_write(text + count, length - count);
+        // If we're in an interrupt, then don't wait for more room. Queue up what we can.
+        if (cpu_interrupt_active()) {
+            break;
+        }
+        usb_background();
+    }
+    #endif
+
+    port_serial_write_substring(text, length);
+}
+
+void serial_write(const char *text) {
+    serial_write_substring(text, strlen(text));
+}