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enable external 32k osc for esp32c2

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This commit is contained in:
jingli
2022-01-10 17:34:13 +08:00
parent efd5376fc0
commit 9eec740a16
3 changed files with 15 additions and 0 deletions
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8
components/esp_hw_support/port/esp32c2/rtc_clk.c
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@@ -19,6 +19,8 @@
#include "soc/efuse_reg.h" #include "soc/efuse_reg.h"
#include "soc/syscon_reg.h" #include "soc/syscon_reg.h"
#include "soc/system_reg.h" #include "soc/system_reg.h"
#include "soc/io_mux_reg.h"
#include "soc/soc.h"
#include "regi2c_ctrl.h" #include "regi2c_ctrl.h"
#include "regi2c_bbpll.h" #include "regi2c_bbpll.h"
#include "esp_hw_log.h" #include "esp_hw_log.h"
@@ -35,6 +37,12 @@ static int s_cur_pll_freq;
static void rtc_clk_cpu_freq_to_8m(void); static void rtc_clk_cpu_freq_to_8m(void);
void rtc_clk_32k_enable_external(void)
{
REG_SET_BIT(PERIPHS_IO_MUX_XTAL_32K_P_U, FUN_IE);
REG_SET_BIT(RTC_CNTL_PAD_HOLD_REG, RTC_CNTL_GPIO_PIN0_HOLD);
}
void rtc_clk_8m_enable(bool clk_8m_en, bool d256_en) void rtc_clk_8m_enable(bool clk_8m_en, bool d256_en)
{ {
if (clk_8m_en) { if (clk_8m_en) {

2
components/esp_system/port/soc/esp32c2/clk.c
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@@ -147,6 +147,8 @@ static void select_rtc_slow_clk(slow_clk_sel_t slow_clk)
* will time out, returning 0. * will time out, returning 0.
*/ */
ESP_EARLY_LOGD(TAG, "waiting for external clock by pin0 to start up"); ESP_EARLY_LOGD(TAG, "waiting for external clock by pin0 to start up");
rtc_clk_32k_enable_external();
// When SLOW_CLK_CAL_CYCLES is set to 0, clock calibration will not be performed at startup. // When SLOW_CLK_CAL_CYCLES is set to 0, clock calibration will not be performed at startup.
if (SLOW_CLK_CAL_CYCLES > 0) { if (SLOW_CLK_CAL_CYCLES > 0) {
cal_val = rtc_clk_cal(RTC_CAL_EXT_CLK, SLOW_CLK_CAL_CYCLES); cal_val = rtc_clk_cal(RTC_CAL_EXT_CLK, SLOW_CLK_CAL_CYCLES);

5
components/soc/esp32c2/include/soc/rtc.h
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@@ -240,6 +240,11 @@ rtc_xtal_freq_t rtc_clk_xtal_freq_get(void);
*/ */
void rtc_clk_xtal_freq_update(rtc_xtal_freq_t xtal_freq); void rtc_clk_xtal_freq_update(rtc_xtal_freq_t xtal_freq);
/**
* @brief Enable 32KHz external oscillator
*/
void rtc_clk_32k_enable_external(void);
/** /**
* @brief Enable or disable 8 MHz internal oscillator * @brief Enable or disable 8 MHz internal oscillator
* *