[SPI Slave] some problems about SPI transactions
Posted: Fri Jul 06, 2018 5:45 am
I use esp32 as a spi slave device, and select mode 3(CPOL=1 CPHA=1) on both side.
BUT this spi configuration is invalid for MISO. It seems like working on mode 2(CPOL=1 CPHA=0)
We captured the waveform through logic analyzer.
Who knows why the waveform is not match configuration?
Code: Select all
spi_slave_interface_config_t slvcfg = {
.mode = 3,
.spics_io_num = GPIO_SPI2_CS,
.queue_size = 3,
.flags = 0,
.post_setup_cb = spi2_post_setup_cb,
.post_trans_cb = spi2_post_trans_cb
};We captured the waveform through logic analyzer.
- slave_mode3.png (154.45 KiB) Viewed 2326 times