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sam3x8e: Add initial support for Arduino Due boards

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This adds basic support for running on the Atmel SAM3x8e
micro-controllers that are found in the Arudino Due boards.

Signed-off-by: Kevin O'Connor <kevin@koconnor.net>
This commit is contained in:
Kevin O'Connor
2016-06-14 14:27:30 -04:00
parent 31c04261c1
commit cc62a3dbf3
10 changed files with 606 additions and 8 deletions
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115
src/sam3x8e/gpio.c Normal file
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// GPIO functions on sam3x8e
//
// Copyright (C) 2016 Kevin O'Connor <kevin@koconnor.net>
//
// This file may be distributed under the terms of the GNU GPLv3 license.
#include <stdint.h> // uint32_t
#include "command.h" // shutdown
#include "compiler.h" // ARRAY_SIZE
#include "gpio.h" // gpio_out_setup
#include "irq.h" // irq_save
#include "sam3x8e.h" // Pio
#include "sched.h" // sched_shutdown
/****************************************************************
* Pin mappings
****************************************************************/
#define GPIO(PORT, NUM) (((PORT)-'A') * 32 + (NUM))
#define GPIO2PORT(PIN) ((PIN) / 32)
#define GPIO2BIT(PIN) (1<<((PIN) % 32))
static Pio * const digital_regs[] = {
PIOA, PIOB, PIOC, PIOD
};
/****************************************************************
* gpio functions
****************************************************************/
void
gpio_peripheral(char bank, uint32_t bit, char ptype, uint32_t pull_up)
{
Pio *regs = digital_regs[bank - 'A'];
if (ptype == 'A')
regs->PIO_ABSR &= ~bit;
else
regs->PIO_ABSR |= bit;
if (pull_up)
regs->PIO_PUER = bit;
else
regs->PIO_PUDR = bit;
regs->PIO_PDR = bit;
}
struct gpio_out
gpio_out_setup(uint8_t pin, uint8_t val)
{
if (GPIO2PORT(pin) >= ARRAY_SIZE(digital_regs))
goto fail;
Pio *regs = digital_regs[GPIO2PORT(pin)];
uint32_t bit = GPIO2BIT(pin);
irqstatus_t flag = irq_save();
if (val)
regs->PIO_SODR = bit;
else
regs->PIO_CODR = bit;
regs->PIO_OER = bit;
regs->PIO_OWER = bit;
regs->PIO_PER = bit;
irq_restore(flag);
return (struct gpio_out){ .regs=regs, .bit=bit };
fail:
shutdown("Not an output pin");
}
void
gpio_out_toggle(struct gpio_out g)
{
Pio *regs = g.regs;
regs->PIO_ODSR ^= g.bit;
}
void
gpio_out_write(struct gpio_out g, uint8_t val)
{
Pio *regs = g.regs;
if (val)
regs->PIO_SODR = g.bit;
else
regs->PIO_CODR = g.bit;
}
struct gpio_in
gpio_in_setup(uint8_t pin, int8_t pull_up)
{
if (GPIO2PORT(pin) >= ARRAY_SIZE(digital_regs))
goto fail;
uint32_t port = GPIO2PORT(pin);
Pio *regs = digital_regs[port];
uint32_t bit = GPIO2BIT(pin);
irqstatus_t flag = irq_save();
PMC->PMC_PCER0 = 1 << (ID_PIOA + port);
if (pull_up)
regs->PIO_PUER = bit;
else
regs->PIO_PUDR = bit;
regs->PIO_ODR = bit;
regs->PIO_PER = bit;
irq_restore(flag);
return (struct gpio_in){ .regs=regs, .bit=bit };
fail:
shutdown("Not an output pin");
}
uint8_t
gpio_in_read(struct gpio_in g)
{
Pio *regs = g.regs;
return !!(regs->PIO_PDSR & g.bit);
}