tqchen commented on a change in pull request #4274: [µTVM] Enable AutoTVM for
ARM STM32F746XX Boards
URL: https://github.com/apache/incubator-tvm/pull/4274#discussion_r343926911
##########
File path: src/runtime/micro/device/arm/stm32f746xx/utvm_timer.c
##########
@@ -0,0 +1,102 @@
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#include "utvm_runtime.h"
+
+// There are two implementations of cycle counters on the STM32F7X: SysTick and
+// CYCCNT. SysTick is preferred, as it gives better error handling, but the
+// counter is only 24 bits wide. If a larger timer is needed, use the CYCCNT
+// implementation, which has a 32-bit counter.
+#define USE_SYSTICK
+
+#ifdef USE_SYSTICK
+
+#define SYST_CSR (*((volatile unsigned long *) 0xE000E010))
+#define SYST_RVR (*((volatile unsigned long *) 0xE000E014))
+#define SYST_CVR (*((volatile unsigned long *) 0xE000E018))
+#define SYST_CALIB (*((volatile unsigned long *) 0xE000E01C))
+
+#define SYST_CSR_ENABLE 0
+#define SYST_CSR_TICKINT 1
+#define SYST_CSR_CLKSOURCE 2
+#define SYST_COUNTFLAG 16
+
+#define SYST_CALIB_NOREF 31
+#define SYST_CALIB_SKEW 30
+
+unsigned long start_time = 0;
+unsigned long stop_time = 0;
+
+int32_t UTVMTimerStart() {
+ SYST_CSR = (1 << SYST_CSR_ENABLE) | (1 << SYST_CSR_CLKSOURCE);
Review comment:
indent(2 space)
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