mirror of
https://github.com/espressif/esp-idf.git
synced 2024-10-05 20:47:46 -04:00
96b152a01f
This commit fixes an issue where in the ULP RISC-V I2C example causes a spurious wakeup of the main CPU because of a Trap signal when the ULP core does not meet the wakeup threshold values. This was due to the fact that the RTC_CNTL_COCPU_DONE signal was being set before the RTC_CNTL_COCPU_SHUT_RESET_EN signal which was causing the the ULP RISC-V core to not reset properly on each cycle. Closes https://github.com/espressif/esp-idf/issues/10301
117 lines
3.9 KiB
C
117 lines
3.9 KiB
C
/*
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* SPDX-FileCopyrightText: 2020-2021 Espressif Systems (Shanghai) CO LTD
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*
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* SPDX-License-Identifier: Apache-2.0
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*/
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#include <stdio.h>
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#include <string.h>
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#include <stdlib.h>
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#include "sdkconfig.h"
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#include "esp_attr.h"
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#include "esp_err.h"
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#include "esp_log.h"
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#if CONFIG_IDF_TARGET_ESP32S2
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#include "esp32s2/clk.h"
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#include "esp32s2/ulp.h"
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#include "esp32s2/ulp_riscv.h"
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#elif CONFIG_IDF_TARGET_ESP32S3
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#include "esp32s3/clk.h"
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#include "esp32s3/ulp.h"
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#include "esp32s3/ulp_riscv.h"
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#endif
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#include "soc/soc.h"
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#include "soc/rtc.h"
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#include "soc/rtc_cntl_reg.h"
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#include "soc/sens_reg.h"
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#include "ulp_private.h"
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#include "esp_rom_sys.h"
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esp_err_t ulp_riscv_run(void)
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{
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#if CONFIG_IDF_TARGET_ESP32S2
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/* Reset COCPU when power on. */
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SET_PERI_REG_MASK(RTC_CNTL_COCPU_CTRL_REG, RTC_CNTL_COCPU_SHUT_RESET_EN);
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/* The coprocessor cpu trap signal doesnt have a stable reset value,
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force ULP-RISC-V clock on to stop RTC_COCPU_TRAP_TRIG_EN from waking the CPU*/
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SET_PERI_REG_MASK(RTC_CNTL_COCPU_CTRL_REG, RTC_CNTL_COCPU_CLK_FO);
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/* Disable ULP timer */
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CLEAR_PERI_REG_MASK(RTC_CNTL_ULP_CP_TIMER_REG, RTC_CNTL_ULP_CP_SLP_TIMER_EN);
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/* wait for at least 1 RTC_SLOW_CLK cycle */
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esp_rom_delay_us(20);
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/* Select RISC-V as the ULP_TIMER trigger target. */
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CLEAR_PERI_REG_MASK(RTC_CNTL_COCPU_CTRL_REG, RTC_CNTL_COCPU_SEL);
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/* Select ULP-RISC-V to send the DONE signal. */
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SET_PERI_REG_MASK(RTC_CNTL_COCPU_CTRL_REG, RTC_CNTL_COCPU_DONE_FORCE);
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/* start ULP_TIMER */
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CLEAR_PERI_REG_MASK(RTC_CNTL_ULP_CP_CTRL_REG, RTC_CNTL_ULP_CP_FORCE_START_TOP);
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SET_PERI_REG_MASK(RTC_CNTL_ULP_CP_TIMER_REG, RTC_CNTL_ULP_CP_SLP_TIMER_EN);
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return ESP_OK;
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#elif CONFIG_IDF_TARGET_ESP32S3
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/* Reset COCPU when power on. */
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SET_PERI_REG_MASK(RTC_CNTL_COCPU_CTRL_REG, RTC_CNTL_COCPU_SHUT_RESET_EN);
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/* The coprocessor cpu trap signal doesnt have a stable reset value,
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force ULP-RISC-V clock on to stop RTC_COCPU_TRAP_TRIG_EN from waking the CPU*/
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SET_PERI_REG_MASK(RTC_CNTL_COCPU_CTRL_REG, RTC_CNTL_COCPU_CLK_FO);
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/* Disable ULP timer */
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CLEAR_PERI_REG_MASK(RTC_CNTL_ULP_CP_TIMER_REG, RTC_CNTL_ULP_CP_SLP_TIMER_EN);
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/* wait for at least 1 RTC_SLOW_CLK cycle */
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esp_rom_delay_us(20);
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/* We do not select RISC-V as the Coprocessor here as this could lead to a hang
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* in the main CPU. Instead, we reset RTC_CNTL_COCPU_SEL after we have enabled the ULP timer.
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*
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* IDF-4510
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*/
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//CLEAR_PERI_REG_MASK(RTC_CNTL_COCPU_CTRL_REG, RTC_CNTL_COCPU_SEL);
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/* Select ULP-RISC-V to send the DONE signal */
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SET_PERI_REG_MASK(RTC_CNTL_COCPU_CTRL_REG, RTC_CNTL_COCPU_DONE_FORCE);
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/* Set the CLKGATE_EN signal */
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SET_PERI_REG_MASK(RTC_CNTL_COCPU_CTRL_REG, RTC_CNTL_COCPU_CLKGATE_EN);
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/* start ULP_TIMER */
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CLEAR_PERI_REG_MASK(RTC_CNTL_ULP_CP_CTRL_REG, RTC_CNTL_ULP_CP_FORCE_START_TOP);
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SET_PERI_REG_MASK(RTC_CNTL_ULP_CP_TIMER_REG, RTC_CNTL_ULP_CP_SLP_TIMER_EN);
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/* Select RISC-V as the ULP_TIMER trigger target
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* Selecting the RISC-V as the Coprocessor at the end is a workaround
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* for the hang issue recorded in IDF-4510.
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*/
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CLEAR_PERI_REG_MASK(RTC_CNTL_COCPU_CTRL_REG, RTC_CNTL_COCPU_SEL);
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/* Clear any spurious wakeup trigger interrupts upon ULP startup */
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esp_rom_delay_us(20);
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REG_WRITE(RTC_CNTL_INT_CLR_REG, RTC_CNTL_COCPU_INT_CLR | RTC_CNTL_COCPU_TRAP_INT_CLR | RTC_CNTL_ULP_CP_INT_CLR);
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return ESP_OK;
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#endif
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}
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esp_err_t ulp_riscv_load_binary(const uint8_t* program_binary, size_t program_size_bytes)
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{
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if (program_binary == NULL) {
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return ESP_ERR_INVALID_ARG;
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}
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if (program_size_bytes > ULP_RESERVE_MEM) {
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return ESP_ERR_INVALID_SIZE;
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}
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uint8_t* base = (uint8_t*) RTC_SLOW_MEM;
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//Start by clearing memory reserved with zeros, this will also will initialize the bss:
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memset(base, 0, ULP_RESERVE_MEM);
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memcpy(base, program_binary, program_size_bytes);
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return ESP_OK;
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}
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