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42 lines
1.2 KiB
C
42 lines
1.2 KiB
C
/* ULP-RISC-V example
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This example code is in the Public Domain (or CC0 licensed, at your option.)
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Unless required by applicable law or agreed to in writing, this
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software is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR
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CONDITIONS OF ANY KIND, either express or implied.
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This code runs on ULP-RISC-V coprocessor
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*/
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#include <stdio.h>
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#include <stdint.h>
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#include <stdbool.h>
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#include "ulp_riscv/ulp_riscv.h"
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#include "ulp_riscv/ulp_riscv_utils.h"
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#include "ulp_riscv/ulp_riscv_gpio.h"
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static bool gpio_level = false;
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/* this variable will be exported as a public symbol, visible from main CPU: */
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bool gpio_level_previous = false;
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int main (void)
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{
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gpio_level = (bool)ulp_riscv_gpio_get_level(GPIO_NUM_0);
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gpio_level_previous = gpio_level;
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while(1) {
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gpio_level = (bool)ulp_riscv_gpio_get_level(GPIO_NUM_0);
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/* Wakes up the main CPU if pin changed its state */
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if(gpio_level != gpio_level_previous) {
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gpio_level_previous = gpio_level;
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ulp_riscv_wakeup_main_processor();
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break;
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}
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}
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/* ulp_riscv_shutdown() is called automatically when main exits */
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return 0;
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}
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