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TAL System API Reference

The TAL System API (tal_system.h) provides platform-independent system utilities: critical sections, sleep/delay, timing, random numbers, reset management, and PSRAM allocation.

Header: #include "tal_system.h" (or #include "tal_api.h" for the full TAL surface)

Critical Sections​

Disable interrupts to protect shared state in ISR-safe code paths.

uint32_t tal_system_enter_critical(void);
void tal_system_exit_critical(uint32_t irq_mask);

Convenience macros:

TAL_ENTER_CRITICAL();
/* critical code -- interrupts disabled */
TAL_EXIT_CRITICAL();

Sleep and Delay​

tal_system_sleep​

Yield the current thread for the specified duration. Uses vTaskDelay on RTOS platforms.

void tal_system_sleep(uint32_t time_ms);

:::note ESP32 Minimum sleep is 10 ms. Values below 10 are clamped to 10. :::

tal_system_delay​

Blocking delay (does not yield to other threads). Use sparingly.

void tal_system_delay(uint32_t time_ms);

Timing​

tal_system_get_tick_count​

Get the system tick count (platform-specific resolution).

SYS_TICK_T tal_system_get_tick_count(void);

tal_system_get_millisecond​

Get milliseconds since boot. Wraps at UINT32_MAX (~49 days for 32-bit).

SYS_TIME_T tal_system_get_millisecond(void);

Use unsigned subtraction for elapsed time to handle wrap correctly:

SYS_TIME_T start = tal_system_get_millisecond();
/* ... work ... */
SYS_TIME_T elapsed = tal_system_get_millisecond() - start;

Random Numbers​

tal_system_get_random​

Get a random integer in the range [0, range).

int tal_system_get_random(uint32_t range);

Uses esp_random() on ESP32 (hardware RNG when Wi-Fi/BT is active).

warning

This is not a cryptographic RNG. For security-sensitive operations, use tal_security_* APIs.

System Reset​

tal_system_reset​

Perform a software reset.

void tal_system_reset(void);

Calls esp_restart() on ESP32.

tal_system_get_reset_reason​

Get the reason for the last reset.

TUYA_RESET_REASON_E tal_system_get_reset_reason(char **describe);

Returns an enum value. The describe parameter is currently not filled on ESP32 (pass NULL or ignore).

Reset reasons: TUYA_RESET_REASON_POWERON, TUYA_RESET_REASON_HW_WDOG, TUYA_RESET_REASON_SW_WDOG, TUYA_RESET_REASON_SOFTWARE, TUYA_RESET_REASON_DEEPSLEEP, TUYA_RESET_REASON_FAULT, TUYA_RESET_REASON_UNKNOWN.

CPU Info​

tal_system_get_cpu_info​

OPERATE_RET tal_system_get_cpu_info(TUYA_CPU_INFO_T **cpu_ary, int32_t *cpu_cnt);
note

Returns OPRT_NOT_SUPPORTED on ESP32. Use esp_chip_info() directly if needed.

PSRAM Allocation​

Available only when ENABLE_EXT_RAM=1 (typically ESP32-S3 with PSRAM).

void *tal_psram_malloc(size_t size);
void  tal_psram_free(void *ptr);
void *tal_psram_calloc(size_t nitems, size_t size);
void *tal_psram_realloc(void *ptr, size_t size);
int   tal_psram_get_free_heap_size(void);

On ESP32, tal_psram_malloc uses heap_caps_malloc(size, MALLOC_CAP_SPIRAM). Standard tal_malloc uses internal RAM by default.

Use PSRAM for large buffers (audio, image, AI model data) to preserve internal RAM for stack and DMA.

Usage Example​

#include "tal_system.h"
#include "tal_log.h"

void system_info(void)
{
    TAL_PR_INFO("uptime: %u ms", tal_system_get_millisecond());
    TAL_PR_INFO("random: %d", tal_system_get_random(100));

    TUYA_RESET_REASON_E reason = tal_system_get_reset_reason(NULL);
    TAL_PR_INFO("last reset reason: %d", reason);

#if defined(ENABLE_EXT_RAM) && (ENABLE_EXT_RAM == 1)
    TAL_PR_INFO("PSRAM free: %d bytes", tal_psram_get_free_heap_size());
#endif
}

References​