Diff: ESP8266.cpp

Revision:

1:44f2f0e5d685

Parent:

0:7868fa4f17d0

Child:

4:962bf18523f4

--- a/ESP8266.cpp	Fri Jan 30 11:02:55 2015 +0000
+++ b/ESP8266.cpp	Fri Jan 30 11:27:31 2015 +0000
@@ -1,4 +1,66 @@
 #include "ESP8266.h"
 
+static Serial uart(p28, p27);
+static ring_buffer rx_buffer = { { 0 }, 0, 0};
+
 
 
+static void write_char(unsigned char c)
+{
+    int i = (unsigned int)(rx_buffer.head + 1) % SERIAL_BUFFER_SIZE;
+
+    // if we should be storing the received character into the location
+    // just before the tail (meaning that the head would advance to the
+    // current location of the tail), we're about to overflow the buffer
+    // and so we don't write the character or advance the head.
+    if (i != rx_buffer.tail) {
+        rx_buffer.buffer[rx_buffer.head] = c;
+        rx_buffer.head = i;
+    }
+}
+
+static void uart_irq_callback()
+{
+    // Note: you need to actually read from the serial to clear the RX interrupt
+    while(uart.readable()) {
+        write_char(uart.getc());
+    }
+}
+
+int read_char(void)
+{
+    // if the head isn't ahead of the tail, we don't have any characters
+    if (rx_buffer.head == rx_buffer.tail) {
+        return -1;
+    } else {
+        unsigned char c = rx_buffer.buffer[rx_buffer.tail];
+        rx_buffer.tail = (unsigned int)(rx_buffer.tail + 1) % SERIAL_BUFFER_SIZE;
+        return c;
+    }
+}
+
+int available(void)
+{
+    return (unsigned int)(SERIAL_BUFFER_SIZE + rx_buffer.head - rx_buffer.tail) % SERIAL_BUFFER_SIZE;
+}
+
+/**
+ * 使用uart.printf或者uart.puts方法时, 当发送数据大于14个字符时, 就会出现异常(串口不断的输出不可显示的字符)
+ * 因此, 相关字符串的打印使用下面的函数来完成, 虽然很简陋, 但是很管用!
+ */
+void uart_send_string(const char *str)
+{
+    if (!str)
+        return;
+
+    while(*str)
+        uart.putc(*str++);
+}
+
+void ESP8266_init(void)
+{
+    uart.attach(&uart_irq_callback);
+}
+
+
+