TCA8418: TCA8418

COCO J

Part Number: TCA8418

Hi Ti：

How can the initialization register be configured so that all 16 ports are configured in gpio out mode and the output is high

over 2 years ago

0 Clemens Ladisch over 2 years ago

Guru 318790 points

There are not 16 but 18 pins.

Configure the pins as GPIO by clearing their bits in the KP_GPIOx registers (this is the default), set them as outputs in the GPIO_DIRx registers, and make the output high with the GPIO_DAT_OUTx registers. (To prevent a low pulse, set GPIO_DAT_OUTx before GPIO_DIRx.)

0 COCO J over 2 years ago in reply to Clemens Ladisch

Prodigy 20 points

Read the gpio status REG_GPIO_DAT_STAT1 REG_GPIO_DAT_STAT2 REG_GPIO_DAT_STAT3 code how to convert to status value 0 or 1

static int tca8418_gpio_get(struct gpio_chip *gpiochip, unsigned int offset)
{
struct tca8418_keypad *keypad_data
= container_of(gpiochip, struct tca8418_keypad, gc);

int byte_offset = offset/8;
u8 value = 0;

tca8418_read_byte(keypad_data,
REG_GPIO_DAT_STAT1+byte_offset,
&value);

return (int)value<<(byte_offset*8);
}

We're currently using this one, but it's not getting the right state。

0 Clemens Ladisch over 2 years ago in reply to COCO J

Guru 318790 points

u8 bit_offset = offset % 8;
return (value >> bit_offset) & 1;

0 Tyler Townsend over 2 years ago in reply to COCO J

TI__Guru 53358 points

Hi COCO J,

Please let me know if the coding change from Clemens fixed your issue.

Regards,

Tyler

0 COCO J over 2 years ago in reply to Tyler Townsend

Prodigy 20 points

TI:

How do I convert this

Now the second pin starts after the write value becomes 0x4002

Normal should be 0x02

0 Clemens Ladisch over 2 years ago in reply to COCO J

Guru 318790 points

You can write (...)&0xff to extract the byte, but this should not be necessary.

Interface

Interface forum

TCA8418: TCA8418