Merge branch 'bugfix/ulp_riscv_i2c_example_crashes_on_s2_v4.4' into 'release/v4.4'

ulp-riscv: ULP RISC-V I2C example gets stuck on esp32s2 (v4.4)

See merge request espressif/esp-idf!21861

Author: Zim Kalinowski

components/ulp/ulp_riscv.c

@@ -32,8 +32,6 @@ esp_err_t ulp_riscv_run(void)
 #if CONFIG_IDF_TARGET_ESP32S2
     /* 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*/
@@ -57,8 +55,6 @@ esp_err_t ulp_riscv_run(void)
 #elif CONFIG_IDF_TARGET_ESP32S3
     /* 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*/

components/ulp/ulp_riscv/ulp_riscv_utils.c

@@ -31,11 +31,8 @@ void ulp_riscv_shutdown(void)
     /* Setting the delay time after RISCV recv `DONE` signal, Ensure that action `RESET` can be executed in time. */
     REG_SET_FIELD(RTC_CNTL_COCPU_CTRL_REG, RTC_CNTL_COCPU_SHUT_2_CLK_DIS, 0x3F);
 
-    /* suspends the ulp operation*/
-    SET_PERI_REG_MASK(RTC_CNTL_COCPU_CTRL_REG, RTC_CNTL_COCPU_DONE);
-
-    /* Resets the processor */
-    SET_PERI_REG_MASK(RTC_CNTL_COCPU_CTRL_REG, RTC_CNTL_COCPU_SHUT_RESET_EN);
+    /* Suspends the ulp operation and reset the ULP core. Must be the final operation before going to halt. */
+    SET_PERI_REG_MASK(RTC_CNTL_COCPU_CTRL_REG, RTC_CNTL_COCPU_DONE | RTC_CNTL_COCPU_SHUT_RESET_EN);
 
     while(1);
 }