From 22987435fa01f4b671ef1972f39b84cc1a2c03ee Mon Sep 17 00:00:00 2001
From: Andrew <lzzbhad@gmail.com>
Date: Sun, 22 Jan 2017 22:38:24 +0800
Subject: [PATCH] softuart tx complete

---
 examples/softuart/main.c   |  4 +++-
 extras/softuart/softuart.c | 46 +++++++++++++++++++++++++++++++++++---
 extras/softuart/softuart.h |  6 +++--
 3 files changed, 50 insertions(+), 6 deletions(-)

diff --git a/examples/softuart/main.c b/examples/softuart/main.c
index 350cde9..d684c69 100644
--- a/examples/softuart/main.c
+++ b/examples/softuart/main.c
@@ -25,6 +25,8 @@ void user_init(void)
     {
         if (!softuart_available())
             continue;
-        printf("%c",softuart_read());
+        char c = softuart_read();
+        printf("input:%c\n",c);
+        softuart_puts("start\r\n");
     }
 }
diff --git a/extras/softuart/softuart.c b/extras/softuart/softuart.c
index 05d5bcb..d1cd6c7 100644
--- a/extras/softuart/softuart.c
+++ b/extras/softuart/softuart.c
@@ -79,7 +79,43 @@ void handle_rx(uint8_t gpio_num)
     // Reenable interrupt
     gpio_set_interrupt(rx_pin, GPIO_INTTYPE_EDGE_NEG, handle_rx);
 }
-
+static uint8_t inline chbit(uint8_t data, uint8_t bit)
+{
+    if((data & bit) != 0)
+    {
+        return 1;
+    } else 
+    {
+        return 0;
+    }
+}
+uint8_t softuart_putchar( char data)
+{
+    unsigned i;
+    unsigned start_time = 0x7FFFFFFF & sdk_system_get_time();
+    gpio_write(tx_pin, 0);
+    for(i = 0; i <= 8; i++)
+    {
+        while((0x7FFFFFFF & sdk_system_get_time()) < (start_time + (s.bit_time*(i+1))))
+        {
+            if((0x7FFFFFFF & sdk_system_get_time()) < start_time) { break;}
+        }
+        gpio_write(tx_pin, chbit(data, 1<<i));
+    }
+    while((0x7FFFFFFF & sdk_system_get_time()) < (start_time + (s.bit_time*9)))
+    {
+        if((0x7FFFFFFF & sdk_system_get_time()) < start_time){ break;}
+    }
+    gpio_write(tx_pin, 1);
+    sdk_os_delay_us(s.bit_time*6);
+    return 0;
+}
+void softuart_puts(const char *c)
+{
+    while( *c ) {
+        softuart_putchar((uint8_t)*c++);
+    }
+}
 bool softuart_init(uint32_t baudrate)
 {
     if (baudrate == 0)
@@ -89,12 +125,16 @@ bool softuart_init(uint32_t baudrate)
     s.bit_time = (1000000 / baudrate);
     if ( ((100000000 / baudrate) - (100*s.bit_time)) > 50 )
         s.bit_time++;
-
+    //Set Rx
     gpio_enable(rx_pin, GPIO_INPUT);
     gpio_set_pullup(rx_pin, true, false);
     // Set up the interrupt handler to get the startbit
     gpio_set_interrupt(rx_pin, GPIO_INTTYPE_EDGE_NEG, handle_rx);
-
+    //Set Tx
+    gpio_enable(tx_pin, GPIO_OUTPUT);
+    gpio_set_pullup(tx_pin, true, false);
+    gpio_write(tx_pin, 1);
+    sdk_os_delay_us(100000);
     return true;
 }
 
diff --git a/extras/softuart/softuart.h b/extras/softuart/softuart.h
index dd7a268..fdd65be 100644
--- a/extras/softuart/softuart.h
+++ b/extras/softuart/softuart.h
@@ -28,7 +28,8 @@ extern "C"
 #endif
 
 // FIXME: for now you need to provide the gpio number for RX here
-#define rx_pin 13
+#define rx_pin 4
+#define tx_pin 5
 
 #define SOFTUART_MAX_RX_BUFF 64
 #define SOFTUART_GPIO_COUNT 16
@@ -79,7 +80,8 @@ bool softuart_available();
  * @return current byte
  */
 uint8_t softuart_read();
-
+uint8_t softuart_putchar(char data);
+void softuart_puts(const char *c);
 #ifdef __cplusplus
 }
 #endif