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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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23
examples/system/ulp/main/ulp/pulse_cnt.S
View File

@ -66,12 +66,29 @@ io_number:
.text
.global entry
entry:
/* Read the value of lower 16 RTC IOs into R0 */
READ_RTC_FIELD(RTC_GPIO_IN_REG, RTC_GPIO_IN_NEXT)
/* Load io_number, extract the state of input */
/* Load io_number */
move r3, io_number
ld r3, r3, 0
/* Lower 16 IOs and higher need to be handled separately,
* because r0-r3 registers are 16 bit wide.
* Check which IO this is.
*/
move r0, r3
jumpr read_io_high, 16, ge
/* Read the value of lower 16 RTC IOs into R0 */
READ_RTC_REG(RTC_GPIO_IN_REG, RTC_GPIO_IN_NEXT_S, 16)
rsh r0, r0, r3
jump read_done
/* Read the value of RTC IOs 16-17, into R0 */
read_io_high:
READ_RTC_REG(RTC_GPIO_IN_REG, RTC_GPIO_IN_NEXT_S + 16, 2)
sub r3, r3, 16
rsh r0, r0, r3
read_done:
and r0, r0, 1
/* State of input changed? */
move r3, next_edge

15
examples/system/ulp/main/ulp_example_main.c
View File

@ -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));