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samd21: Initial support for SAMD21 micro-controllers

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Add initial support for the Atmel SAMD21 micro-controllers.

Signed-off-by: Kevin O'Connor <kevin@koconnor.net>
This commit is contained in:
Kevin O'Connor
2018-07-27 19:22:44 -04:00
parent 71db5fbe31
commit 74cf4dc9e0
9 changed files with 351 additions and 0 deletions
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22
src/samd21/gpio.c Normal file
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// samd21 gpio functions
//
// Copyright (C) 2018 Kevin O'Connor <kevin@koconnor.net>
//
// This file may be distributed under the terms of the GNU GPLv3 license.
#include "internal.h" // gpio_peripheral
#include "samd21.h" // PORT
void
gpio_peripheral(char bank, uint32_t bit, char ptype, uint32_t pull_up)
{
int group = bank == 'A' ? 0 : 1;
PortGroup *pg = &PORT->Group[group];
if (ptype) {
volatile uint8_t *pmux = &pg->PMUX[bit/2].reg;
uint8_t shift = (bit & 1) ? 4 : 0, mask = ~(0xf << shift);
*pmux = (*pmux & mask) | ((ptype - 'A') << shift);
}
pg->PINCFG[bit].reg = ((ptype ? PORT_PINCFG_PMUXEN : 0)
| (pull_up ? PORT_PINCFG_PULLEN : 0));
}