patacongo commented on a change in pull request #1613:
URL: https://github.com/apache/incubator-nuttx/pull/1613#discussion_r474233904
##########
File path: arch/xtensa/src/esp32/esp32_clockconfig.c
##########
@@ -52,13 +46,278 @@ enum xtal_freq_e
XTAL_AUTO = 0
};
-enum xtal_freq_e
+enum cpu_freq_e
{
- CPU_80M = 1,
- CPU_160M = 2,
- CPU_240M = 3,
+ CPU_80M = 0,
+ CPU_160M = 1,
+ CPU_240M = 2,
};
-#endif
+
+/****************************************************************************
+ * Private Functions
+ ****************************************************************************/
+
+extern void ets_delay_us(int delay_us);
+
+/****************************************************************************
+ * Name: esp32_set_cpu_freq
+ *
+ * Description:
+ * Switch to one of PLL-based frequencies.
+ * Current frequency can be XTAL or PLL.
+ *
+ * Input Parameters:
+ * cpu_freq_mhz - new CPU frequency
+ *
+ * Returned Value:
+ * None
+ *
+ ****************************************************************************/
+
+static void esp32_set_cpu_freq(int cpu_freq_mhz)
+{
+ int dbias = DIG_DBIAS_80M_160M;
+ int per_conf;
+ uint32_t value;
+
+ switch (cpu_freq_mhz)
+ {
+ case 160:
+ per_conf = CPU_160M;
+ break;
+ case 240:
+ dbias = DIG_DBIAS_240M;
+ per_conf = CPU_240M;
+ break;
+ case 80:
+ per_conf = CPU_80M;
+ default:
+ break;
+ }
+
+ value = (((80 * MHZ) >> 12) & UINT16_MAX)
+ | ((((80 * MHZ) >> 12) & UINT16_MAX) << 16);
Review comment:
```suggestion
((((80 * MHZ) >> 12) & UINT16_MAX) << 16);
```
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