64 lines
1.6 KiB
C
64 lines
1.6 KiB
C
/** @file afio.c
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* Module handling Alternate Functions for Inputs/Outputs
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*
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* The module provides functions to remap ios to diverse peripherals
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*/
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//--includes--------------------------------------------------------------------
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#include "afio.h"
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#include "afio_regs.h"
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#include "rcc.h"
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//--local definitions-----------------------------------------------------------
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//--local variables-------------------------------------------------------------
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static volatile struct AFIO* regs = (struct AFIO*)AFIO_BASE_ADDRESS;
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//--public functions------------------------------------------------------------
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void afio_map_exti(enum ExtiLine line_mask, enum GpioPort port)
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{
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//ensure afio peripheral is enabled
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rcc_enable(RCC_AHB_NONE, RCC_APB1_NONE, RCC_APB2_AFIO);
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for (uint8_t i = 0; i < 4; ++i) {
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if (line_mask & (0x1 << i)) {
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regs->EXTICR1.word &= ~(0xF << (4 * i));
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regs->EXTICR1.word |= (port << (4 * i));
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}
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}
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line_mask = line_mask >> 4;
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for (uint8_t i = 0; i < 4; ++i) {
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if (line_mask & (0x1 << i)) {
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regs->EXTICR2.word &= ~(0xF << (4 * i));
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regs->EXTICR2.word |= (port << (4 * i));
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}
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}
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line_mask = line_mask >> 4;
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for (uint8_t i = 0; i < 4; ++i) {
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if (line_mask & (0x1 << i)) {
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regs->EXTICR3.word &= ~(0xF << (4 * i));
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regs->EXTICR3.word |= (port << (4 * i));
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}
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}
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line_mask = line_mask >> 4;
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for (uint8_t i = 0; i < 4; ++i) {
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if (line_mask & (0x1 << i)) {
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regs->EXTICR4.word &= ~(0xF << (4 * i));
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regs->EXTICR4.word |= (port << (4 * i));
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}
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}
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}
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//--local functions-------------------------------------------------------------
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