esp32 ulp programming

[duffster]

A recent update to the Arduino-core made the arduino_ulp incompatible so I updated my platform.txt to work with latest core and have the latest fixes. This has the unfortunate effect of making older core installation incompatible with this so you may have to update your core before this will work.

[JuanHuarte]

Well, looks like I can use the ulp assembly MACROS to program ulp coprocessor. Here is a little test sketch I put together that just blinks my esp32's on board led. Not sure all esp32 led's are on the same pin but you can change that in the sketch. I'm still trying to work through the docs about the esp32 so at this time i'm not sure what the registers def all mean I just got lucky by coping pasting from an example to get the led configured.

Code: Select all

/*
 * ESP32 Sketch shows that you can program the ulp co-processor using
 * Arduino using the ulp assembly MACRO's. This sketch just blinks the
 * on board LED on for x microseconds and OFF x microseconds using the ulp. 
 * This sketch was inspired from https://github.com/espressif/esp-idf/blob/98e5c475b31ce704e08bd1a48f5d2de3f0b216b0/components/ulp/test/test_ulp.c 
 */
#include "esp32/ulp.h"
#include "driver/rtc_io.h"

void ULP_BLINK_RUN(uint32_t us);

void setup() {
  // microseconds to delay between halt and wake states
  ULP_BLINK_RUN(100000);
}

void loop() {
  // put your main code here, to run repeatedly:

}
// ------------------------------------------------------------------------
void ULP_BLINK_RUN(uint32_t us) {
  RTC_SLOW_MEM[12] = 0;
  ulp_set_wakeup_period(0, us);
  const ulp_insn_t  ulp_blink[] = {
    I_MOVI(R3, 12),                         // #12 -> R3
    I_LD(R0, R3, 0),                        // R0 = RTC_SLOW_MEM[R3(#12)] 
    M_BL(1, 1),                             // GOTO M_LABEL(1) IF R0 < 1
    I_WR_REG(RTC_GPIO_OUT_REG, 26, 27, 1),  // RTC_GPIO12 = 1
    I_SUBI(R0, R0, 1),                      // R0 = R0 - 1, R0 = 1, R0 = 0
    I_ST(R0, R3, 0),                        // RTC_SLOW_MEM[R3(#12)] = R0
    M_BX(2),                                // GOTO M_LABEL(2)
    M_LABEL(1),                             // M_LABEL(1)
      I_WR_REG(RTC_GPIO_OUT_REG, 26, 27, 0),// RTC_GPIO12 = 0
      I_ADDI(R0, R0, 1),                    // R0 = R0 + 1, R0 = 0, R0 = 1
      I_ST(R0, R3, 0),                      // RTC_SLOW_MEM[R3(#12)] = R0
    M_LABEL(2),                             // M_LABEL(2)
    I_HALT()                                // HALT COPROCESSOR
  };
  const gpio_num_t led_gpios[] = {
    GPIO_NUM_2,
    GPIO_NUM_0,
    GPIO_NUM_4
  };
  for (size_t i = 0; i < sizeof(led_gpios) / sizeof(led_gpios[0]); ++i) {
    rtc_gpio_init(led_gpios[i]);
    rtc_gpio_set_direction(led_gpios[i], RTC_GPIO_MODE_OUTPUT_ONLY);
    rtc_gpio_set_level(led_gpios[i], 0);
  }
  size_t size = sizeof(ulp_blink) / sizeof(ulp_insn_t);
  ulp_process_macros_and_load(0, ulp_blink, &size);
  ulp_run(0);
}

hi, i wanna ask if you had done a macro c code for ADC

[JuanHuarte]

Well, looks like I can use the ulp assembly MACROS to program ulp coprocessor. Here is a little test sketch I put together that just blinks my esp32's on board led. Not sure all esp32 led's are on the same pin but you can change that in the sketch. I'm still trying to work through the docs about the esp32 so at this time i'm not sure what the registers def all mean I just got lucky by coping pasting from an example to get the led configured.

Code: Select all

/*
 * ESP32 Sketch shows that you can program the ulp co-processor using
 * Arduino using the ulp assembly MACRO's. This sketch just blinks the
 * on board LED on for x microseconds and OFF x microseconds using the ulp. 
 * This sketch was inspired from https://github.com/espressif/esp-idf/blob/98e5c475b31ce704e08bd1a48f5d2de3f0b216b0/components/ulp/test/test_ulp.c 
 */
#include "esp32/ulp.h"
#include "driver/rtc_io.h"

void ULP_BLINK_RUN(uint32_t us);

void setup() {
  // microseconds to delay between halt and wake states
  ULP_BLINK_RUN(100000);
}

void loop() {
  // put your main code here, to run repeatedly:

}
// ------------------------------------------------------------------------
void ULP_BLINK_RUN(uint32_t us) {
  RTC_SLOW_MEM[12] = 0;
  ulp_set_wakeup_period(0, us);
  const ulp_insn_t  ulp_blink[] = {
    I_MOVI(R3, 12),                         // #12 -> R3
    I_LD(R0, R3, 0),                        // R0 = RTC_SLOW_MEM[R3(#12)] 
    M_BL(1, 1),                             // GOTO M_LABEL(1) IF R0 < 1
    I_WR_REG(RTC_GPIO_OUT_REG, 26, 27, 1),  // RTC_GPIO12 = 1
    I_SUBI(R0, R0, 1),                      // R0 = R0 - 1, R0 = 1, R0 = 0
    I_ST(R0, R3, 0),                        // RTC_SLOW_MEM[R3(#12)] = R0
    M_BX(2),                                // GOTO M_LABEL(2)
    M_LABEL(1),                             // M_LABEL(1)
      I_WR_REG(RTC_GPIO_OUT_REG, 26, 27, 0),// RTC_GPIO12 = 0
      I_ADDI(R0, R0, 1),                    // R0 = R0 + 1, R0 = 0, R0 = 1
      I_ST(R0, R3, 0),                      // RTC_SLOW_MEM[R3(#12)] = R0
    M_LABEL(2),                             // M_LABEL(2)
    I_HALT()                                // HALT COPROCESSOR
  };
  const gpio_num_t led_gpios[] = {
    GPIO_NUM_2,
    GPIO_NUM_0,
    GPIO_NUM_4
  };
  for (size_t i = 0; i < sizeof(led_gpios) / sizeof(led_gpios[0]); ++i) {
    rtc_gpio_init(led_gpios[i]);
    rtc_gpio_set_direction(led_gpios[i], RTC_GPIO_MODE_OUTPUT_ONLY);
    rtc_gpio_set_level(led_gpios[i], 0);
  }
  size_t size = sizeof(ulp_blink) / sizeof(ulp_insn_t);
  ulp_process_macros_and_load(0, ulp_blink, &size);
  ulp_run(0);
}

hi i would like to ask you if you have done a project for the ADC programming with the ULP. Thanks