espressif/esp-idf
1
0
Fork 1
mirror of https://github.com/espressif/esp-idf.git synced 2026-05-05 04:15:21 +02:00
Code Issues Packages Projects Releases Wiki Activity

Merge branch 'bugfix/rtc_clk_32k_bootstrap' into 'master'

Browse Source 
bugfix/rtc_clk_32k_bootstrap: Fix starting 32k RTC

See merge request idf/esp-idf!2085
This commit is contained in:
Ivan Grokhotkov
2018-03-21 18:38:49 +08:00
parent 8478823039 f7df532ec0
commit 887b6e2925
7 changed files with 142 additions and 38 deletions
Download Patch File Download Diff File Expand all files Collapse all files
components/soc/esp32/rtc_clk.c
+28 -1
View File
@@ -19,6 +19,7 @@
#include "rom/ets_sys.h"
#include "rom/rtc.h"
#include "rom/uart.h"
#include "rom/gpio.h"
#include "soc/rtc.h"
#include "soc/rtc_cntl_reg.h"
#include "soc/rtc_io_reg.h"
@@ -122,11 +123,37 @@ void rtc_clk_32k_enable(bool enable)
}
}
void rtc_clk_32k_bootstrap()
/* Helping external 32kHz crystal to start up.
* External crystal connected to outputs GPIO32 GPIO33.
* Forms N pulses with a frequency of about 32KHz on the outputs of the crystal.
*/
void rtc_clk_32k_bootstrap(uint32_t cycle)
{
if (cycle){
const uint32_t pin_32 = 32;
const uint32_t pin_33 = 33;
const uint32_t mask_32 = (1 << (pin_32 - 32));
const uint32_t mask_33 = (1 << (pin_33 - 32));
gpio_pad_select_gpio(pin_32);
gpio_pad_select_gpio(pin_33);
gpio_output_set_high(mask_32, mask_33, mask_32 | mask_33, 0);
const uint32_t delay_us = (1000000 / RTC_SLOW_CLK_FREQ_32K / 2);
while(cycle){
gpio_output_set_high(mask_32, mask_33, mask_32 | mask_33, 0);
ets_delay_us(delay_us);
gpio_output_set_high(mask_33, mask_32, mask_32 | mask_33, 0);
ets_delay_us(delay_us);
cycle--;
}
gpio_output_set_high(0, 0, 0, mask_32 | mask_33); // disable pins
}
CLEAR_PERI_REG_MASK(RTC_IO_XTAL_32K_PAD_REG, RTC_IO_XPD_XTAL_32K);
SET_PERI_REG_MASK(RTC_IO_XTAL_32K_PAD_REG, RTC_IO_X32P_RUE | RTC_IO_X32N_RDE);
ets_delay_us(XTAL_32K_BOOTSTRAP_TIME_US);
rtc_clk_32k_enable_internal(XTAL_32K_BOOTSTRAP_DAC_VAL,
XTAL_32K_BOOTSTRAP_DRES_VAL, XTAL_32K_BOOTSTRAP_DBIAS_VAL);
}