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74cf4dc9e0
Add initial support for the Atmel SAMD21 micro-controllers. Signed-off-by: Kevin O'Connor <kevin@koconnor.net>
23 lines
723 B
C
23 lines
723 B
C
// samd21 gpio functions
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//
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// Copyright (C) 2018 Kevin O'Connor <kevin@koconnor.net>
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//
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// This file may be distributed under the terms of the GNU GPLv3 license.
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#include "internal.h" // gpio_peripheral
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#include "samd21.h" // PORT
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void
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gpio_peripheral(char bank, uint32_t bit, char ptype, uint32_t pull_up)
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{
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int group = bank == 'A' ? 0 : 1;
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PortGroup *pg = &PORT->Group[group];
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if (ptype) {
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volatile uint8_t *pmux = &pg->PMUX[bit/2].reg;
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uint8_t shift = (bit & 1) ? 4 : 0, mask = ~(0xf << shift);
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*pmux = (*pmux & mask) | ((ptype - 'A') << shift);
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}
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pg->PINCFG[bit].reg = ((ptype ? PORT_PINCFG_PMUXEN : 0)
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| (pull_up ? PORT_PINCFG_PULLEN : 0));
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}
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