Note

当前版本已发布新的 Bugfix。最新 Bugfix 发布是v5.0.8

Internal and Unstable APIs

This section is listing some APIs that are internal or likely to be changed or removed in the next releases of ESP-IDF.

API Reference

Header File

Functions

int esp_rom_printf(const char *fmt, ...)

Print formated string to console device.

备注

float and long long data are not supported!

参数
  • fmt – Format string

  • ... – Additional arguments, depending on the format string

返回

int: Total number of characters written on success; A negative number on failure.

void esp_rom_delay_us(uint32_t us)

Pauses execution for us microseconds.

参数

us – Number of microseconds to pause

void esp_rom_install_channel_putc(int channel, void (*putc)(char c))

esp_rom_printf can print message to different channels simultaneously. This function can help install the low level putc function for esp_rom_printf.

参数
  • channel – Channel number (startting from 1)

  • putc – Function pointer to the putc implementation. Set NULL can disconnect esp_rom_printf with putc.

void esp_rom_install_uart_printf(void)

Install UART1 as the default console channel, equivalent to esp_rom_install_channel_putc(1, esp_rom_uart_putc)

soc_reset_reason_t esp_rom_get_reset_reason(int cpu_no)

Get reset reason of CPU.

参数

cpu_no – CPU number

返回

Reset reason code (see in soc/reset_reasons.h)

void esp_rom_route_intr_matrix(int cpu_core, uint32_t periph_intr_id, uint32_t cpu_intr_num)

Route peripheral interrupt sources to CPU’s interrupt port by matrix.

Usually there’re 4 steps to use an interrupt:

  1. Route peripheral interrupt source to CPU. e.g. esp_rom_route_intr_matrix(0, ETS_WIFI_MAC_INTR_SOURCE, ETS_WMAC_INUM)

  2. Set interrupt handler for CPU

  3. Enable CPU interupt

  4. Enable peripheral interrupt

参数
  • cpu_core – The CPU number, which the peripheral interupt will inform to

  • periph_intr_id – The peripheral interrupt source number

  • cpu_intr_num – The CPU interrupt number

uint32_t esp_rom_get_cpu_ticks_per_us(void)

Get the real CPU ticks per us.

返回

CPU ticks per us