sleep tests.

Makefile

@@ -66,6 +66,7 @@ tests/nvm-write.obj: src/maca.o src/nvm.o
 tests/rftest-rx.obj: src/maca.o src/nvm.o
 tests/rftest-tx.obj: src/maca.o src/nvm.o
 tests/tmr-ints.obj: src/isr.o
+tests/sleep.obj: src/isr.o
 
 NOTHUMB_CPPFLAGS := $(DBGFLAGS) $(OPTFLAGS) $(RELFLAGS)         \
         -D__KERNEL__ -DTEXT_BASE=$(TEXT_BASE)           \

tests/sleep.c

@@ -0,0 +1,62 @@
+#define GPIO_PAD_DIR0   0x80000000
+#define GPIO_DATA0      0x80000008
+#define CRM_WU_CNTL     0x80003004
+#define CRM_SLEEP_CNTL  0x80003008
+#define CRM_STATUS      0x80003018
+#define GPIO_PAD_PU_EN0 0x80000010
+#define GPIO_PAD_PU_EN1 0x80000014
+#define ADC_CONTROL     0x80000018
+#define CRM_XTAL_CNTL   0x80000040
+
+#define DELAY 400000
+
+#include "embedded_types.h"
+#include "isr.h"
+#include "utils.h"
+
+__attribute__ ((section ("startup"))) void main(void) {
+	reg32(GPIO_PAD_DIR0) = 0x00000100;
+
+	reg32(GPIO_DATA0) = 0x00000100;
+
+	/* disable all pullups */
+	/* seems to make a slight difference (2.0uA vs 1.95uA)*/
+	reg32(GPIO_PAD_PU_EN0) = 0;
+	reg32(GPIO_PAD_PU_EN1) = 0;
+	reg16(ADC_CONTROL) = 0; /* internal Vref2 */
+
+//	reg16(CRM_XTAL_CNTL) = 0x052; /* default is 0xf52 */ /* doesn't anything w.r.t. power */
+
+	/* go to sleep */
+//	reg32(CRM_WU_CNTL) = 0x1; /* enable wakeup from wakeup timer */
+	reg32(CRM_WU_CNTL) = 0; /* don't wake up */
+
+//	reg32(CRM_SLEEP_CNTL) = 1; /* hibernate, RAM page 0 only, don't retain state, don't power GPIO */ /* approx. 2.0uA */
+//	reg32(CRM_SLEEP_CNTL) = 0x41; /* hibernate, RAM page 0 only, retain state, don't power GPIO */ /* approx. 10.0uA */
+//	reg32(CRM_SLEEP_CNTL) = 0x51; /* hibernate, RAM page 0&1 only, retain state, don't power GPIO */ /* approx. 11.7uA */
+//	reg32(CRM_SLEEP_CNTL) = 0x61; /* hibernate, RAM page 0&1 only, retain state, don't power GPIO */ /* approx. 13.9uA */
+//	reg32(CRM_SLEEP_CNTL) = 0x71; /* hibernate, RAM page 0&1 only, retain state, don't power GPIO */ /* approx. 16.1uA - possibly with periodic refresh*/
+//	reg32(CRM_SLEEP_CNTL) = 0xf1; /* hibernate, RAM page 0&1 only, retain state,       power GPIO */ /* approx. 16.1uA - possibly with periodic refresh*/
+
+//	reg32(CRM_SLEEP_CNTL) = 2; /* doze     , RAM page 0 only, don't retain state, don't power GPIO */ /* approx. 69.2 uA */
+//	reg32(CRM_SLEEP_CNTL) = 0x42; /* doze     , RAM page 0 only, retain state, don't power GPIO */ /* approx. 77.3uA */
+//	reg32(CRM_SLEEP_CNTL) = 0x52; /* doze     , RAM page 0&1 only, retain state, don't power GPIO */ /* approx. 78.9uA */
+//	reg32(CRM_SLEEP_CNTL) = 0x62; /* doze     , RAM page 0&1 only, retain state, don't power GPIO */ /* approx. 81.2uA */
+//	reg32(CRM_SLEEP_CNTL) = 0x72; /* doze     , RAM page 0&1 only, retain state, don't power GPIO */ /* approx. 83.4uA - possibly with periodic refresh*/
+	reg32(CRM_SLEEP_CNTL) = 0xf2; /* doze     , RAM page 0&1 only, retain state,       power GPIO */ /* approx. 82.8uA - possibly with periodic refresh*/
+	reg32(CRM_STATUS) = 1; /* write 1 to sleep_sync --- this totally powers down */
+	
+
+	volatile uint32_t i;
+	while(1) {
+
+		reg32(GPIO_DATA0) = 0x00000100;
+		
+		for(i=0; i<DELAY; i++) { continue; }
+
+		reg32(GPIO_DATA0) = 0x00000000;
+
+		for(i=0; i<DELAY; i++) { continue; }
+
+	};
+}