Doesn't work VSPI and I2C at same time.

[akira.matsuda]

Hi, I got a problem and want to know the reason of this weird behavior of esp-idf or esp32.

The problem occurs when I connect sensors with SPI and I2C, VSPI and I2C both at same time.
When I assign these pins for SPI and I2C, esp32 could not read datas from I2C sensor because of I2C command time out (ESP_ERR_TIMEOUT).

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// I2C
gpio_num_t SDA = GPIO_NUM_21;
gpio_num_t SCL = GPIO_NUM_22;

// SPI
gpio_num_t sclk = GPIO_NUM_18;
gpio_num_t miso = GPIO_NUM_23;
gpio_num_t mosi = GPIO_NUM_19;
gpio_num_t cs = GPIO_NUM_5;

I'm using this library.
https://github.com/natanaeljr/esp32-MPU-driver for I2C sensor(MPU9250).

I try to change I2C pin assign to SCD = GPIO_NUM_26, SCL = GPIO_NUM_15, then it works.
Is anybody knows why these above configuration could not work?

[WiFive]

If you init vspi in quad mode with default pins it will use 21 & 22

[akira.matsuda]

Thank you for your reply.

I don't use quad mode.
The following code is my setting of spi_bus_config_t.

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bus_config.quadwp_io_num = -1; // Not used
bus_config.quadhd_io_num = -1; // Not used
bus_config.flags = (SPI_DEVICE_TXBIT_LSBFIRST | SPI_DEVICE_RXBIT_LSBFIRST | SPI_DEVICE_NO_DUMMY)

[rsimpsonbusa]

Hi akiro.matsuda.

I ALMOST have the same config.
In a define.h include file I have

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#define FMOSI							23
#define FMISO							19
#define FCLK							18
#define FCS							5

vs your 

gpio_num_t sclk = GPIO_NUM_18; --same
gpio_num_t miso = GPIO_NUM_23; -- actually mosi
gpio_num_t mosi = GPIO_NUM_19; -- actually miso
gpio_num_t cs = GPIO_NUM_5; -- same

#define SDAW                			                21      // SDA
#define SCLW                			                22   // SCL

then in the main file

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int ret;
	spi_bus_config_t 				buscfg;
	spi_device_interface_config_t 	devcfg;
	memset(&buscfg,0,sizeof(buscfg));
	memset(&devcfg,0,sizeof(devcfg));
	buscfg.mosi_io_num=MOSI;
	buscfg .miso_io_num=MISO;
	buscfg.sclk_io_num=CLK;
	buscfg.quadwp_io_num=-1;
	buscfg .quadhd_io_num=-1;
	//Initialize the SPI bus
	ret=spi_bus_initialize(VSPI_HOST, &buscfg, 0);
	assert(ret == ESP_OK);

	devcfg .clock_speed_hz=40000000;              	//Clock out at 40 MHz
	devcfg.mode=0;                                	//SPI mode 0
	devcfg.spics_io_num=CS;               			//CS pin
	devcfg.queue_size=7;                         	//We want to be able to queue 7 transactions at a time
	devcfg.flags=SPI_DEVICE_HALFDUPLEX;

	ret=spi_bus_add_device(VSPI_HOST, &devcfg, &spi);
	if (ret==ESP_OK)

......

I dont know if the IOMUX pins are fixed and cannot be changed, but mine works great at 40MHZ the SPI bus and 700K the I2C (Oled).

Good luck