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samd21: Add support for gpio pins 

Signed-off-by: Kevin O'Connor <kevin@koconnor.net>
This commit is contained in:
Kevin O'Connor 2018-07-31 15:49:37 -04:00
parent 74cf4dc9e0
commit cf2393efc8
4 changed files with 111 additions and 0 deletions
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1
klippy/pins.py
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@ -40,6 +40,7 @@ MCU_PINS = {
"at90usb1286": port_pins(6), "at90usb646": port_pins(6),
"atmega1280": port_pins(12), "atmega2560": port_pins(12),
"sam3x8e": port_pins(4, 32),
"samd21g": port_pins(2, 32),
"stm32f103": port_pins(5, 16),
"lpc176x": lpc_pins(),
"pru": beaglebone_pins(),

1
src/samd21/Kconfig
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@ -5,6 +5,7 @@ if MACH_SAMD21
config SAMD_SELECT
bool
default y
select HAVE_GPIO
config BOARD_DIRECTORY
string

87
src/samd21/gpio.c
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@ -4,8 +4,17 @@
//
// This file may be distributed under the terms of the GNU GPLv3 license.
#include "board/irq.h" // irq_save
#include "command.h" // shutdown
#include "gpio.h" // gpio_out_setup
#include "internal.h" // gpio_peripheral
#include "samd21.h" // PORT
#include "sched.h" // sched_shutdown
/****************************************************************
* Pin multiplexing
****************************************************************/
void
gpio_peripheral(char bank, uint32_t bit, char ptype, uint32_t pull_up)
@ -20,3 +29,81 @@ gpio_peripheral(char bank, uint32_t bit, char ptype, uint32_t pull_up)
pg->PINCFG[bit].reg = ((ptype ? PORT_PINCFG_PMUXEN : 0)
| (pull_up ? PORT_PINCFG_PULLEN : 0));
}
/****************************************************************
* General Purpose Input Output (GPIO) pins
****************************************************************/
#define GPIO(PORT, NUM) (((PORT)-'A') * 32 + (NUM))
#define GPIO2PORT(PIN) ((PIN) / 32)
#define GPIO2NUM(PIN) ((PIN) % 32)
#define GPIO2BIT(PIN) (1<<((PIN) % 32))
#define NUM_PORT 2
struct gpio_out
gpio_out_setup(uint8_t pin, uint8_t val)
{
if (GPIO2PORT(pin) >= NUM_PORT)
goto fail;
PortGroup *pg = &PORT->Group[GPIO2PORT(pin)];
uint32_t bit = GPIO2BIT(pin);
irqstatus_t flag = irq_save();
if (val)
pg->OUTSET.reg = bit;
else
pg->OUTCLR.reg = bit;
pg->DIRSET.reg = bit;
pg->PINCFG[GPIO2NUM(pin)].reg = 0;
irq_restore(flag);
return (struct gpio_out){ .regs=pg, .bit=bit };
fail:
shutdown("Not an output pin");
}
void
gpio_out_toggle_noirq(struct gpio_out g)
{
PortGroup *pg = g.regs;
pg->OUTTGL.reg = g.bit;
}
void
gpio_out_toggle(struct gpio_out g)
{
gpio_out_toggle_noirq(g);
}
void
gpio_out_write(struct gpio_out g, uint8_t val)
{
PortGroup *pg = g.regs;
if (val)
pg->OUTSET.reg = g.bit;
else
pg->OUTCLR.reg = g.bit;
}
struct gpio_in
gpio_in_setup(uint8_t pin, int8_t pull_up)
{
if (GPIO2PORT(pin) >= NUM_PORT)
goto fail;
PortGroup *pg = &PORT->Group[GPIO2PORT(pin)];
uint32_t bit = GPIO2BIT(pin);
irqstatus_t flag = irq_save();
pg->PINCFG[GPIO2NUM(pin)].reg = pull_up > 0 ? PORT_PINCFG_PULLEN : 0;
pg->DIRCLR.reg = bit;
irq_restore(flag);
return (struct gpio_in){ .regs=pg, .bit=bit };
fail:
shutdown("Not an input pin");
}
uint8_t
gpio_in_read(struct gpio_in g)
{
PortGroup *pg = g.regs;
return !!(pg->IN.reg & g.bit);
}

22
src/samd21/gpio.h Normal file
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@ -0,0 +1,22 @@
#ifndef __SAM3X8E_GPIO_H
#define __SAM3X8E_GPIO_H
#include <stdint.h>
struct gpio_out {
void *regs;
uint32_t bit;
};
struct gpio_out gpio_out_setup(uint8_t pin, uint8_t val);
void gpio_out_toggle_noirq(struct gpio_out g);
void gpio_out_toggle(struct gpio_out g);
void gpio_out_write(struct gpio_out g, uint8_t val);
struct gpio_in {
void *regs;
uint32_t bit;
};
struct gpio_in gpio_in_setup(uint8_t pin, int8_t pull_up);
uint8_t gpio_in_read(struct gpio_in g);
#endif // gpio.h