Adds ADC12 support to MSP430X port.

Adds support for the MSP430X's 12-bit ADC peripheral, as well as
reasonably complete testing of same.

Also includes fixes for several bugs and cleanup of the DMA peripheral,
which used ch calls rather than osal calls and was unclear about what
contexts its methods could be called from.

2 files changed, 13 insertions, 5 deletions

diff --git a/os/common/ports/MSP430X/chcore.c b/os/common/ports/MSP430X/chcore.c
index 7a8d7f2..b9001b0 100644
--- a/os/common/ports/MSP430X/chcore.c
+++ b/os/common/ports/MSP430X/chcore.c
@@ -32,6 +32,8 @@
 /* Module exported variables.                                                */

 /*===========================================================================*/

 

+bool __msp430x_in_isr;

+

 /*===========================================================================*/

 /* Module local types.                                                       */

 /*===========================================================================*/

@@ -98,6 +100,11 @@ void _port_thread_start(void) {
   asm volatile ("mov R5, R12");

   asm volatile ("call R4");

 #endif

+#if defined(_CHIBIOS_RT_CONF_)

+  chThdExit(MSG_OK);

+#endif

+#if defined(_CHIBIOS_NIL_CONF_)

   chSysHalt(0);

+#endif

 }

 /** @} */

diff --git a/os/common/ports/MSP430X/chcore.h b/os/common/ports/MSP430X/chcore.h
index 3683c1d..9e1efa8 100644
--- a/os/common/ports/MSP430X/chcore.h
+++ b/os/common/ports/MSP430X/chcore.h
@@ -28,6 +28,8 @@
 #include <msp430.h>

 #include <in430.h>

 

+extern bool __msp430x_in_isr;

+

 /*===========================================================================*/

 /* Module constants.                                                         */

 /*===========================================================================*/

@@ -225,7 +227,7 @@ struct port_context {
  * @details This macro must be inserted at the start of all IRQ handlers

  *          enabled to invoke system APIs.

  */

-#define PORT_IRQ_PROLOGUE() 

+#define PORT_IRQ_PROLOGUE() __msp430x_in_isr = true;

 

 /**

  * @brief   IRQ epilogue code.

@@ -233,6 +235,7 @@ struct port_context {
  *          enabled to invoke system APIs.

  */

 #define PORT_IRQ_EPILOGUE() {                                               \

+  __msp430x_in_isr = false;                                                 \

   _dbg_check_lock();                                                        \

   if (chSchIsPreemptionRequired())                                          \

     chSchDoReschedule();                                                    \

@@ -298,7 +301,7 @@ extern "C" {
  * @brief   Port-related initialization code.

  */

 static inline void port_init(void) {

-

+  __msp430x_in_isr = false;

 }

 

 /**

@@ -333,9 +336,7 @@ static inline bool port_irq_enabled(syssts_t sts) {
  * @retval true         running in ISR mode.

  */

 static inline bool port_is_isr_context(void) {

-  /* Efficiency would be enhanced by not doing this, 

-   * because of implementation details */

-  return __get_SR_register() & GIE;

+  return __msp430x_in_isr;

 }

 

 /**