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ulp example: fix for RTC IOs

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- call rtc_gpio_init for pins which aren't configured as RTC by default
- for RTC IOs 16 and 17, read higher part of the input register
- automatically convert GPIO number into RTC IO number
- use ulp_set_wakeup_period instead of writing to register
This commit is contained in:
Ivan Grokhotkov
2018-07-13 17:44:57 +08:00
parent afdc73c8ab
commit 7fbfb0fc9b
2 changed files with 30 additions and 8 deletions
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15
examples/system/ulp/main/ulp_example_main.c
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@@ -13,6 +13,7 @@
#include "nvs_flash.h"
#include "soc/rtc_cntl_reg.h"
#include "soc/sens_reg.h"
#include "soc/rtc_periph.h"
#include "driver/gpio.h"
#include "driver/rtc_io.h"
#include "esp32/ulp.h"
@@ -46,6 +47,10 @@ static void init_ulp_program()
(ulp_main_bin_end - ulp_main_bin_start) / sizeof(uint32_t));
ESP_ERROR_CHECK(err);
/* GPIO used for pulse counting. */
gpio_num_t gpio_num = GPIO_NUM_0;
assert(rtc_gpio_desc[gpio_num].reg && "GPIO used for pulse counting must be an RTC IO");
/* Initialize some variables used by ULP program.
* Each 'ulp_xyz' variable corresponds to 'xyz' variable in the ULP program.
* These variables are declared in an auto generated header file,
@@ -58,11 +63,11 @@ static void init_ulp_program()
ulp_debounce_counter = 3;
ulp_debounce_max_count = 3;
ulp_next_edge = 0;
ulp_io_number = 11; /* GPIO0 is RTC_IO 11 */
ulp_io_number = rtc_gpio_desc[gpio_num].rtc_num; /* map from GPIO# to RTC_IO# */
ulp_edge_count_to_wake_up = 10;
/* Initialize GPIO0 as RTC IO, input, disable pullup and pulldown */
gpio_num_t gpio_num = GPIO_NUM_0;
/* Initialize selected GPIO as RTC IO, enable input, disable pullup and pulldown */
rtc_gpio_init(gpio_num);
rtc_gpio_set_direction(gpio_num, RTC_GPIO_MODE_INPUT_ONLY);
rtc_gpio_pulldown_dis(gpio_num);
rtc_gpio_pullup_dis(gpio_num);
@@ -76,10 +81,10 @@ static void init_ulp_program()
rtc_gpio_isolate(GPIO_NUM_12);
rtc_gpio_isolate(GPIO_NUM_15);
/* Set ULP wake up period to T = 20ms (3095 cycles of RTC_SLOW_CLK clock).
/* Set ULP wake up period to T = 20ms.
* Minimum pulse width has to be T * (ulp_debounce_counter + 1) = 80ms.
*/
REG_SET_FIELD(SENS_ULP_CP_SLEEP_CYC0_REG, SENS_SLEEP_CYCLES_S0, 3095);
ulp_set_wakeup_period(0, 20000);
/* Start the program */
err = ulp_run((&ulp_entry - RTC_SLOW_MEM) / sizeof(uint32_t));