Real-hardware Parker C21 24 V solenoid cycle test on MAX22200 CH0. More...

#include <cinttypes>
#include <cstdio>
#include <memory>
#include "freertos/FreeRTOS.h"
#include "freertos/task.h"
#include "esp_log.h"
#include "esp32_max22200_bus.hpp"
#include "esp32_max22200_test_config.hpp"
#include "max22200.hpp"
#include "max22200_registers.hpp"
#include "max22200_types.hpp"

Include dependency graph for c21_cycle_test.cpp:

Namespaces
namespace	cfg

Macros
#define	ESP32_MAX22200_ENABLE_DETAILED_SPI_LOGGING 0

#define	ESP32_MAX22200_ENABLE_VERBOSE_BUS_LOGGING 1

Functions
void	app_main ()

Variables
constexpr uint8_t	cfg::kChannel = 0
	OUT0 / SOL_CH0.

constexpr uint16_t	cfg::kHitCurrent_mA = 102
	24 V / 235 Ω ≈ 102 mA

constexpr uint16_t	cfg::kHoldCurrent_mA = 51
	50 % of hit per C21 table

constexpr float	cfg::kHitTime_ms = 100.0f
	C21 minimum hit pulse.

constexpr ChopFreq	cfg::kChopFreq = ChopFreq::FMAIN_DIV4
	≥ 1 kHz floor

constexpr uint32_t	cfg::kOnDuration_ms = 2000

constexpr uint32_t	cfg::kOffDuration_ms = 2000

constexpr uint32_t	cfg::kCycleCount = 0
	0 = run forever

constexpr uint32_t	cfg::kTelemetryPeriod_ms = 100
	10 Hz

constexpr bool	cfg::kEnableSlewRateControl = true

constexpr bool	cfg::kEnableOpenLoadDetection = false

constexpr bool	cfg::kEnablePlungerMovementDet = false

constexpr bool	cfg::kEnableHitCurrentCheck = false

Detailed Description

Real-hardware Parker C21 24 V solenoid cycle test on MAX22200 CH0.

Drives a single Parker C21-series 24 V solenoid (235 Ω coil → 102 mA peak / 51 mA hold per the C21 Hit-and-Hold table) on MAX22200 channel 0 in CDR (current-controlled hit-and-hold) mode and cycles it ON / OFF periodically. A 10 Hz telemetry task scrapes:

STATUS register (ACTIVE flag, channels-on bitmask, fault summary)
FAULT register (per-channel OCP / HHF / OLF / DPM bitmasks)
last CMD-echo byte (fault flags the chip stuffs into MISO on every cmd transfer, datasheet Figure 7)
nFAULT pin (open-drain, asserts LOW on any unmasked fault)

Default cycle profile: ON for 2000 ms (102 mA hit pulse for 100 ms then 51 mA hold) OFF for 2000 ms (channel released) telemetry @ 10 Hz throughout run forever (Ctrl-] to stop)

Edit the cfg namespace below for a different C21 variant or cycle cadence.

Wiring (Flux V1 / generic ESP32-S3 dev rig): See main/esp32_max22200_test_config.hpp for the full pinout. SPI: MISO=GPIO35, MOSI=GPIO37, SCLK=GPIO36, CS=GPIO38; Control: ENABLE=GPIO2, CMD=GPIO39, FAULT_N=GPIO42, TRIGA=GPIO40, TRIGB=GPIO41. Coil between OUT0 and +VM (low-side switching).

Build / flash: From examples/esp32: ./scripts/build_app.sh c21_cycle_test Debug ./scripts/flash_app.sh flash_monitor c21_cycle_test Debug

DPM polarity reminder (datasheet §"Detection of Plunger Movement"): FAULT.DPM bit = 1 → drop NOT revealed → plunger STUCK (fault) FAULT.DPM bit = 0 → current dip seen → plunger MOVING (healthy) See c21_dpm_tuning_test for live tuning.

Author: HardFOC

Date: 2026

Macro Definition Documentation

◆ ESP32_MAX22200_ENABLE_DETAILED_SPI_LOGGING

#define ESP32_MAX22200_ENABLE_DETAILED_SPI_LOGGING 0

◆ ESP32_MAX22200_ENABLE_VERBOSE_BUS_LOGGING

#define ESP32_MAX22200_ENABLE_VERBOSE_BUS_LOGGING 1

Function Documentation

◆ app_main()

void app_main ( void )

Namespaces

Macros