How to toggle the ncs pin assigned to a slave in the DeviceTree.

RE: How to toggle the ncs pin assigned to a slave in the DeviceTree.

ben241 — Wed, 08 Jan 2025 16:42:29 GMT

Hi,
I'm doing something similar but I have some issues. Is the "power_up_init_reg()" function just writing the registries following the datasheet? At step 139, can you read 0x80 from the registry 0x6C?

Thank you very much in advance for your help

RE: How to toggle the ncs pin assigned to a slave in the DeviceTree.

HashSplash — Thu, 11 Jul 2024 08:57:57 GMT

Thank you! Removing the CS pin from the SPI node entirely worked for me, and now I just lower the NCS pin manually whenever I need to read or write data.

RE: How to toggle the ncs pin assigned to a slave in the DeviceTree.

Naeem Maroof — Wed, 10 Jul 2024 09:00:51 GMT

Hi,

based on the overlay, you can obtain and drive the CS pin like this:

const struct device *gpiodev =DEVICE_DT_GET(DT_NODELABEL(gpio0));
#define CSB_PIN 30

//and doing for example:
static int bme_read_reg(uint8_t reg, uint8_t *data, int size)
{
    //..
    gpio_pin_set(gpiodev, CSB_PIN, 1);
    //..
	gpio_pin_set(gpiodev, CSB_PIN, 0);
    //..
    
	return 0;
}