cc3200: Refactor UART and I2C object creation.

I2C objects can be freed by the GC and a __del__ method is provided
in order to de-init the peripheral prior to being garbage collected.
UART objects are now added to a local list and this list is now part
of the VM_STATE.

2 files changed, 18 insertions, 7 deletions

diff --git a/cc3200/hal/cc3200_hal.c b/cc3200/hal/cc3200_hal.c
index 75b0dca03..7932d9e06 100644
--- a/cc3200/hal/cc3200_hal.c
+++ b/cc3200/hal/cc3200_hal.c
@@ -70,11 +70,16 @@ static void hal_EnableSdCard (void);
 #endif
 
 /******************************************************************************
- DECLARE LOCAL VARIABLES
+ DECLARE LOCAL DATA
  ******************************************************************************/
 static volatile uint32_t HAL_tickCount;
 
 /******************************************************************************
+ DECLARE PUBLIC DATA
+ ******************************************************************************/
+struct _pyb_uart_obj_t *pyb_stdio_uart;
+
+/******************************************************************************
  DECLARE IMPORTED DATA
  ******************************************************************************/
 extern void (* const g_pfnVectors[256])(void);
@@ -134,8 +139,9 @@ void mp_hal_stdout_tx_str(const char *str) {
 }
 
 void mp_hal_stdout_tx_strn(const char *str, uint32_t len) {
-    if (MP_STATE_PORT(pyb_stdio_uart) != NULL) {
-        uart_tx_strn(MP_STATE_PORT(pyb_stdio_uart), str, len);
+    // send stdout to UART
+    if (pyb_stdio_uart != NULL) {
+        uart_tx_strn(pyb_stdio_uart, str, len);
     }
     // and also to telnet
     if (telnet_is_active()) {
@@ -145,8 +151,8 @@ void mp_hal_stdout_tx_strn(const char *str, uint32_t len) {
 
 void mp_hal_stdout_tx_strn_cooked(const char *str, uint32_t len) {
     // send stdout to UART
-    if (MP_STATE_PORT(pyb_stdio_uart) != NULL) {
-        uart_tx_strn_cooked(MP_STATE_PORT(pyb_stdio_uart), str, len);
+    if (pyb_stdio_uart != NULL) {
+        uart_tx_strn_cooked(pyb_stdio_uart, str, len);
     }
     // and also to telnet
     if (telnet_is_active()) {
@@ -159,8 +165,8 @@ int mp_hal_stdin_rx_chr(void) {
         if (telnet_rx_any()) {
             return telnet_rx_char();
         }
-        else if (MP_STATE_PORT(pyb_stdio_uart) != NULL && uart_rx_any(MP_STATE_PORT(pyb_stdio_uart))) {
-            return uart_rx_char(MP_STATE_PORT(pyb_stdio_uart));
+        else if (pyb_stdio_uart != NULL && uart_rx_any(pyb_stdio_uart)) {
+            return uart_rx_char(pyb_stdio_uart);
         }
         HAL_Delay(1);
     }
diff --git a/cc3200/hal/cc3200_hal.h b/cc3200/hal/cc3200_hal.h
index ecf500b63..71b644239 100644
--- a/cc3200/hal/cc3200_hal.h
+++ b/cc3200/hal/cc3200_hal.h
@@ -53,6 +53,11 @@
                                      }
 
 /******************************************************************************
+ DECLARE PUBLIC DATA
+ ******************************************************************************/
+extern struct _pyb_uart_obj_t *pyb_stdio_uart;
+
+/******************************************************************************
  DECLARE PUBLIC FUNCTIONS
  ******************************************************************************/