96 lines
2.9 KiB
C
96 lines
2.9 KiB
C
#include "io.h"
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// Local functions
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typedef struct pin_s {
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GPIO_TypeDef* GPIO;
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uint16_t pinmask;
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bool input;
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} pin_t;
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static void pin_create(pin_t* pin, GPIO_TypeDef* GPIO, uint8_t pinnr, bool input);
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static bool pin_get(pin_t* pin);
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static void pin_set(pin_t* pin, bool status);
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static void pin_toggle(pin_t* pin);
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// Local variables
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static pin_t pin_t0;
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static pin_t pin_t1;
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static pin_t pin_t2;
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static pin_t pin_t3;
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static uint8_t new = 0;
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static uint8_t old = 0;
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static volatile uint8_t edg = 0;
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void pin_create(pin_t* pin, GPIO_TypeDef* GPIO, uint8_t pinnr, bool input) {
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GPIO_InitTypeDef gi; // Create gpio init structure
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GPIO_StructInit(&gi); // Fill gpio init structure with defaults
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gi.GPIO_Pin = 1 << pinnr; // create bitmask out of pin number
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if(input) { // If the pin is set to be an input
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gi.GPIO_Mode = GPIO_Mode_IN; // Set mode to input
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gi.GPIO_OType = GPIO_OType_OD; // Set type to open drain
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gi.GPIO_PuPd = GPIO_PuPd_UP; // Set a pullup
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} else {
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gi.GPIO_Mode = GPIO_Mode_OUT; // Set mode to output
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gi.GPIO_OType = GPIO_OType_PP; // Set type to pushpull
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gi.GPIO_PuPd = GPIO_PuPd_NOPULL; // Set no pullup
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}
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GPIO_Init(GPIO,&gi); // Update the GPIO configuration
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pin->GPIO=GPIO; // Set the gpiopin in the pin structure
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pin->pinmask=0x01<<pinnr; // Insert the pinmask
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pin->input = input; // Store the input information
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}
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bool pin_get(pin_t* pin) {
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if(pin->input) { // If the pin is an input
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return GPIO_ReadInputDataBit(pin->GPIO,pin->pinmask); // Read its value
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} else { // If the pin is an output
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return GPIO_ReadOutputDataBit(pin->GPIO,pin->pinmask); // Read its set value
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}
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}
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void pin_set(pin_t* pin, bool status) {
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if(!pin->input) { // If the pin isn't an input
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GPIO_WriteBit(pin->GPIO,pin->pinmask,status); // Set its value accordingly
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}
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}
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void pin_toggle(pin_t* pin) {
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if(!pin->input) { // If the pin isn't an input
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pin_set(pin,!pin_get(pin)); // Toggle its value
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}
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}
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void io_init(void){
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RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOA | RCC_AHB1Periph_GPIOC,ENABLE); // Enable gpio clock source
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pin_create(&pin_t0, GPIOC, 7, true); // create pin_t0
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pin_create(&pin_t1, GPIOB, 15, true); // create pin_t1
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pin_create(&pin_t2, GPIOB, 14, true); // create pin_t2
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pin_create(&pin_t3, GPIOI, 0, true); // create pin_t3
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}
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void io_process(void) {
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new = pin_get(&pin_t0) |
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pin_get(&pin_t1) << 1 |
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pin_get(&pin_t2) << 2 |
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pin_get(&pin_t3) << 3;
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edg |= (new ^ old) & new; // detect positive edge
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old = new;
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}
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bool io_button_has_edge(uint8_t btnnumber) {
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uint8_t bm = (1 << btnnumber); // create bitmask
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bool status = ((edg & bm) > 0); // check if button is pressed
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if(status){
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edg &= ~bm; // clear edge bit
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}
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return status;
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}
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