1 files changed, 65 insertions, 0 deletions
diff --git a/ports/esp32/uart.c b/ports/esp32/uart.c
new file mode 100644
index 000000000..10a4ba462
--- /dev/null
+++ b/ports/esp32/uart.c
@@ -0,0 +1,65 @@
+/*
+ * This file is part of the MicroPython project, http://micropython.org/
+ *
+ * Development of the code in this file was sponsored by Microbric Pty Ltd
+ *
+ * The MIT License (MIT)
+ *
+ * Copyright (c) 2016 Damien P. George
+ *
+ * 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 <stdio.h>
+
+#include "driver/uart.h"
+
+#include "py/mpstate.h"
+#include "py/mphal.h"
+
+STATIC void uart_irq_handler(void *arg);
+
+void uart_init(void) {
+    uart_isr_handle_t handle;
+    uart_isr_register(UART_NUM_0, uart_irq_handler, NULL, ESP_INTR_FLAG_LOWMED | ESP_INTR_FLAG_IRAM, &handle);
+    uart_enable_rx_intr(UART_NUM_0);
+}
+
+// all code executed in ISR must be in IRAM, and any const data must be in DRAM
+STATIC void IRAM_ATTR uart_irq_handler(void *arg) {
+    volatile uart_dev_t *uart = &UART0;
+    uart->int_clr.rxfifo_full = 1;
+    uart->int_clr.frm_err = 1;
+    uart->int_clr.rxfifo_tout = 1;
+    while (uart->status.rxfifo_cnt) {
+        uint8_t c = uart->fifo.rw_byte;
+        if (c == mp_interrupt_char) {
+            // inline version of mp_keyboard_interrupt();
+            MP_STATE_VM(mp_pending_exception) = MP_OBJ_FROM_PTR(&MP_STATE_VM(mp_kbd_exception));
+            #if MICROPY_ENABLE_SCHEDULER
+            if (MP_STATE_VM(sched_state) == MP_SCHED_IDLE) {
+                MP_STATE_VM(sched_state) = MP_SCHED_PENDING;
+            }
+            #endif
+        } else {
+            // this is an inline function so will be in IRAM
+            ringbuf_put(&stdin_ringbuf, c);
+        }
+    }
+}