edge-impulse-sdk/porting/ambiq/ei_classifier_porting.cpp

/* The Clear BSD License
 *
 * Copyright (c) 2025 EdgeImpulse Inc.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted (subject to the limitations in the disclaimer
 * below) provided that the following conditions are met:
 *
 *   * Redistributions of source code must retain the above copyright notice,
 *   this list of conditions and the following disclaimer.
 *
 *   * Redistributions in binary form must reproduce the above copyright
 *   notice, this list of conditions and the following disclaimer in the
 *   documentation and/or other materials provided with the distribution.
 *
 *   * Neither the name of the copyright holder nor the names of its
 *   contributors may be used to endorse or promote products derived from this
 *   software without specific prior written permission.
 *
 * NO EXPRESS OR IMPLIED LICENSES TO ANY PARTY'S PATENT RIGHTS ARE GRANTED BY
 * THIS LICENSE. THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND
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 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
 * PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR
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 * IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 */

/* Include ----------------------------------------------------------------- */
#include "../ei_classifier_porting.h"
#if EI_PORTING_AMBIQ == 1

#include <stdarg.h>
#include <stdlib.h>
#include <cstdio>
#include "ns_timer.h"
#include "ns_ambiqsuite_harness.h"
#include "ns_malloc.h"
#include <cstring>

#if defined(EI_APOLLO_USE_UART) && (EI_APOLLO_USE_UART == 1)
#include "peripheral/uart.h"
#else
#include "peripheral/usb/ei_usb.h"
#endif

#define EI_WEAK_FN __attribute__((weak))

extern ns_timer_config_t ei_tickTimer;

EI_WEAK_FN EI_IMPULSE_ERROR ei_run_impulse_check_canceled() {
    return EI_IMPULSE_OK;
}

/**
 * Cancelable sleep, can be triggered with signal from other thread
 */
EI_WEAK_FN EI_IMPULSE_ERROR ei_sleep(int32_t time_ms) {
    ns_delay_us(time_ms*1000);
    return EI_IMPULSE_OK;
}

uint64_t ei_read_timer_ms() {
    return ns_us_ticker_read(&ei_tickTimer) / 1000L;
}

uint64_t ei_read_timer_us() {
    return ns_us_ticker_read(&ei_tickTimer);

}

__attribute__((weak)) void ei_printf(const char *format, ...) {
    char buffer[1024] = {0};
    int length;
    va_list myargs;
    va_start(myargs, format);
    length = vsnprintf(buffer, sizeof(buffer), format, myargs);
    va_end(myargs);
#if defined(EI_APOLLO_USE_UART) && (EI_APOLLO_USE_UART == 1)
    if (length > 0) {
        uart_send((uint8_t *)buffer, length);
    }
#else
    if (length > 0) {
        ei_usb_send((uint8_t *)buffer, length);
    }
#endif
}

__attribute__((weak)) void ei_printf_float(float f) {
    ei_printf("%f", f);
}

__attribute__((weak)) void *ei_malloc(size_t size) {

    void *p = ns_malloc(size);
    return p;
}

__attribute__((weak)) void *ei_calloc(size_t nitems, size_t size) {

    void *ret = ns_malloc(nitems*size);
    memset(ret, 0, nitems*size);
    return ret;
}

__attribute__((weak)) void ei_free(void *ptr) {

    ns_free(ptr);
}

void ei_putchar(char c) 
{ 
    ei_printf("%c", c);
}

char ei_getchar(void)
{
    char c = 0xFF;

    c = ei_get_serial_byte(false);

    if (c == 0xFF ) { 
        return 0; //weird ei convention
    }

    return c;
}

#if defined(__cplusplus) && EI_C_LINKAGE == 1
extern "C"
#endif
__attribute__((weak)) void DebugLog(const char* s) {
    ei_printf("%s", s);
}

#endif // EI_PORTING_AMBIQ == 1