开始准备将已有项目porting到esp32，采用v4.0 的esp-idf。 但是在编译的时候遇到以下问题

build/esp32/libesp32.a(cpu_start.o): in function `main_task':
/home/fhe/esp/esp-idf/components/esp32/cpu_start.c:556: undefined reference to `app_main'

程序结构如下
esp_idf （文件夹 esp32 sdk）
main.c
Makefile
在console下直接运行make出现上述错误

Makefile内容如下 ...

HI,
I tried to set spi clk configuration by writing the SPI_CLOCK_REG. and then i tried to read it out. and i found it's still a default value of reset. The code is like bellow. Does i missed somewhere before access spi registers?

WRITE_PERI_REG(SPI_CLOCK_REG(SPI_NUM_HSPI),
((0x7 & SPI_CLKDIV ...

Hi,
i'm trying to use the HSPI to communication with my slave spi device, GPIO12~15 is used for the HSPI interafce. But i can't capture any clk output with logic analyzer. Can anybody have a look at this.
lgw_spi_open() // this is for HSPI init
{
gpio_pad_select_gpio(CS_PIN);
gpio_set ...

Hi,
i'm triying to use to enable the spi master function on esp32. with Pins (GPIO12~15 and a reset pin of GPIO4).
this is the spi init fucntion,
nt lgw_spi_open (void** spi_target_ptr) {
gpio_set_direction(CS_PIN, GPIO_MODE_OUTPUT);
PIN_FUNC_SELECT(IO_MUX_GPIO12_REG, FUNC_MTDI_HSPIQ); // Pin ...

Hi,
I'm try to integrate the esp-idf to our makefile based project, and i need to use the spi driver for spi master. so I tried to define my include path in the makefile to include path for driver/spi_master.h. but then i tried to build and many errors occured, like:

components/soc/src/esp32 ...

You should be able to use regular 'ar' tool (this tool is not architecture specific), but you do need to use "xtensa-esp32-elf-gcc -mlongcalls" to build the object files which go into the static library.


Hi, Thanks you. Yes, indeed i need to rebuild the liabrary with the correct toolchain

hi,
i'm trying to call the function which is implemented in a static library(.a file) in app_main(). I already defined to linke this library in the component.mk of the main.c. the libray is prebuilt with GNC toolcahin (gcc),.
the console promote "libmylib.a: error adding symbols: file format not ...