apb_gpio.rst

APB_GPIO

The General Purpose Input/Output (GPIO) IP block supports S/W access to read and write the values on selected I/O, and configuring selected I/O to generate interrupts.

Features

• 32-bit bits of user-selectable I/O.
• I/O can be configured for level type interrupts or edge triggered interrupts.

Theory of Operation

Programming Model

APB GPIO CSRs

SETGPIO offset = 0x00

Field	Bits	Type	Default	Description
gpio_num	7:0	WO		Set GPIO[gpio_num] = 1

CLRGPIO offset = 0x04

Field	Bits	Type	Default	Description
gpio_num	7:0	WO		Set GPIO[gpio_num] = 0

TOGGPIO offset = 0x08

Field	Bits	Type	Default	Description
gpio_num	7:0	WO		Invert the output of GPIO[gpio_num]

PIN0 offset = 0x10

Field	Bits	Type	Default	Description
gpio_value	31:0	RO		gpio_value[31:0] = GPIO[31:0]

PIN1 offset = 0x14

Field	Bits	Type	Default	Description
gpio_value	31:0	RO		gpio_value[31:0] = GPIO[63:32]

PIN2 offset = 0x18

Field	Bits	Type	Default	Description
gpio_value	31:0	RO		gpio_value[31:0] = GPIO[95:64]

PIN3 offset = 0x1C

Field	Bits	Type	Default	Description
gpio_value	31:0	RO		gpio_value[31:0] = GPIO[127:96]

OUT0 offset = 0x20

Field	Bits	Type	Default	Description
value	31:0	WO		Drive value[31:0] onto GPIO[31:0]

OUT1 offset = 0x24

Field	Bits	Type	Default	Description
value	31:0	WO		Drive value[31:0] onto GPIO[63:32]

OUT2 offset = 0x28

Field	Bits	Type	Default	Description
value	31:0	WO		Drive value[31:0] onto GPIO[95:64]

OUT3 offset = 0x2C

Field	Bits	Type	Default	Description
value	31:0	WO		Drive value[31:0] onto GPIO[127:96]

SETSEL offset = 0x30

Field	Bits	Type	Default	Description
gpio_num	7:0	WO	0x0	Set gpio_num for use by RDSTAT
				Note: SETGPIO, CLRGPIO, TOGGPIO and SETINT set gpio_num

RDSTAT offset = 0x34

Field	Bits	Type	Default	Description
mode	25:24	RO	0x0	Read the mode control for GPIO[gpio_num] (set gpio_num using SETSEL)
				0x0: Input only (output is tri-stated)
				0x1: Output active
				0x2: Open drain (value=0 drives 0, when value=1 tristated)
				0x3: Open drain (value=0 drives 0, when value=1 tristated)
INTTYPE	19:17	RO	0x0	Type of interrupt for GPIO[gpio_num]
				0x0: active low, level type interrupt
				0x1: rising edge type interupt
				0x2: falling edge type interrupt
				0x3: no interrupt
				0x4: active high, level type interrupt
				0x5 to 0x7: no interrupt
INTEN	16:16	RW		Enable interrupt for GPIO[gpio_num]
INPUT	12:12	RO		Input value reported by GPIO[gpio_num]
OUTPUT	8:8	RO		Output value that is set on GPIO[gpio_num]
gpio_sel	7:0	RO		Selected gpio

SETMODE offset = 0x38

Field	Bits	Type	Default	Description
mode	25:24	WO	0x0	mode control for GPIO[gpio_num}
				0x0: Input only (output is tri-stated)
				0x1: Output active
				0x2: Open drain (value=0 drives 0, when value=1 tristated)
				0x3: Open drain (value=0 drives 0, when value=1 tristated)
gpio_num	7:0	WO	0x0	Address of GPIO to set mode for

SETINT offset = 0x3C

Field	Bits	Type	Default	Description
INTTYPE	19:17	WO	0x0	Type of interrupt for GPIO[gpio_num]
				0x0: active low, level type interrupt
				0x1: rising edge type interupt
				0x2: falling edge type interrupt
				0x3: no interrupt
				0x4: active high, level type interrupt
				0x5 to 0x7: no interrupt
INTENABLE	16:16	WO	0x0	Enable interrupt on GPIO[GPIO_ADDDR]
gpio_num	7:0	WO	0x0	Address of GPIO to set interrupt type and enable for

INTACK offset = 0x40

Field	Bits	Type	Default	Description
RESERVED	31:8	RW		Enable interrupt for GPIO[gpio_num]
gpio_num	7:0	RW		Input value reported by GPIO[gpio_num]