Is the pin you want to use a multiplexed SPI pin, and if so, you can use SPI. If it is just an ordinary gpio pin, our team does not have a related solution if we want to simulate it as an SPI pin. Reply Use props Report zai...
Using gpio_cdev the line handler return Error { kind: Ioctl { kind: LineHandle, cause: EBUSY } } when requesting a pin configured as SPI chip select. In my case, when running a raspberry pi 5: line 16: "GPIO16" "spi1 CS2" output active-low [used] ls /dev/spidev* /dev/spidev...
Hi there, Looking at the reference information its suggesting that we cannot use GPIO6-11 due to those being used by the internal flash. Are there circumstances where these can be used for other SPI devices if we use a separate CS line when using another SPI device? Thanks Colin...
Hello, I recently designed a custom board that will connect to another board using SPI eDMA but there was a small issue in the design where I swapped
drivers/gpio/gpio-74x164.c Original file line numberDiff line numberDiff line change @@ -137,7 +137,7 @@ static int gen_74x164_probe(struct spi_device *spi)mutex_init(&chip->lock);dev_set_drvdata(&spi->dev, chip); spi_set_drvdata(spi, chip);chip...
mmio_write_32(0x03001064, 0x4); // GPIOA 19 UART1 RTS Copy 如果只想使用UART1,则不需要更改PINMUX,只需要连接 GPIOA28 GPIOA29 如果想要同时使用UART1和UART2的功能,则需要写入寄存器来设置引脚的PINMUX: 在Linux用户空间可以使用devmem工具来写入寄存器 ...
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Pls refer to the AN4419.pdf and AN4419SW. The AN discusses how to write GPIO port with DMA involvement and controlled by PIT, it can simulate PWM signal with variable duty cycle. Hope it can help you BR XiangJun Rong AN4419(GPIO_DMA).pdf 807 KB AN4419SW...
overo_mcp251x_init(); spi_register_board_info(overo_spi_board_info, ARRAY_SIZE(overo_spi_board_info)); GPIO MCP251x interrupt verificationYou can use debugfs to monitor the GPIO used for the MCP251x interrupt signal. Configure the kernel to enable debugfs: ...
Rework Davinci SPI driver to store GPIO CS number in cs_gpio field of SPI device structure (spi_device) for both DT and non-DT cases. This will make Davinci SPI driver code simpler and allows to reuse more SPI core functionality.