esp-idf/components/ulp/ulp_riscv.c

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/*
* SPDX-FileCopyrightText: 2020-2021 Espressif Systems (Shanghai) CO LTD
*
* SPDX-License-Identifier: Apache-2.0
*/
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include "sdkconfig.h"
#include "esp_attr.h"
#include "esp_err.h"
#include "esp_log.h"
#include "esp_private/esp_clk.h"
#include "esp32s2/ulp.h"
#include "esp32s2/ulp_riscv.h"
#include "soc/soc.h"
#include "soc/rtc.h"
#include "soc/rtc_cntl_reg.h"
#include "soc/sens_reg.h"
#include "ulp_private.h"
#include "esp_rom_sys.h"
esp_err_t ulp_riscv_run(void)
{
/* Reset COCPU when power on. */
SET_PERI_REG_MASK(RTC_CNTL_COCPU_CTRL_REG, RTC_CNTL_COCPU_SHUT_RESET_EN);
esp_rom_delay_us(20);
CLEAR_PERI_REG_MASK(RTC_CNTL_COCPU_CTRL_REG, RTC_CNTL_COCPU_SHUT_RESET_EN);
/* The coprocessor cpu trap signal doesnt have a stable reset value,
force ULP-RISC-V clock on to stop RTC_COCPU_TRAP_TRIG_EN from waking the CPU*/
SET_PERI_REG_MASK(RTC_CNTL_COCPU_CTRL_REG, RTC_CNTL_COCPU_CLK_FO);
/* Disable ULP timer */
CLEAR_PERI_REG_MASK(RTC_CNTL_ULP_CP_TIMER_REG, RTC_CNTL_ULP_CP_SLP_TIMER_EN);
/* wait for at least 1 RTC_SLOW_CLK cycle */
esp_rom_delay_us(20);
/* Select RISC-V as the ULP_TIMER trigger target. */
CLEAR_PERI_REG_MASK(RTC_CNTL_COCPU_CTRL_REG, RTC_CNTL_COCPU_SEL);
/* Select ULP-RISC-V to send the DONE signal. */
SET_PERI_REG_MASK(RTC_CNTL_COCPU_CTRL_REG, RTC_CNTL_COCPU_DONE_FORCE);
/* start ULP_TIMER */
CLEAR_PERI_REG_MASK(RTC_CNTL_ULP_CP_CTRL_REG, RTC_CNTL_ULP_CP_FORCE_START_TOP);
SET_PERI_REG_MASK(RTC_CNTL_ULP_CP_TIMER_REG, RTC_CNTL_ULP_CP_SLP_TIMER_EN);
return ESP_OK;
}
esp_err_t ulp_riscv_load_binary(const uint8_t* program_binary, size_t program_size_bytes)
{
if (program_binary == NULL) {
return ESP_ERR_INVALID_ARG;
}
if (program_size_bytes > ULP_RESERVE_MEM) {
return ESP_ERR_INVALID_SIZE;
}
uint8_t* base = (uint8_t*) RTC_SLOW_MEM;
//Start by clearing memory reserved with zeros, this will also will initialize the bss:
memset(base, 0, ULP_RESERVE_MEM);
memcpy(base, program_binary, program_size_bytes);
return ESP_OK;
}