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44 lines
1.0 KiB
44 lines
1.0 KiB
#define MODE_INPUT 0
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#define MODE_OUTPUT 1
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#define MODE_ALTERNATE 2
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#define MODE_ANALOG 3
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#define PULL_NONE 0
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#define PULL_UP 1
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#define PULL_DOWN 2
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void set_gpio_mode(GPIO_TypeDef *GPIO, int pin, int mode) {
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uint32_t tmp = GPIO->MODER;
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tmp &= ~(3 << (pin*2));
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tmp |= (mode << (pin*2));
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GPIO->MODER = tmp;
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}
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void set_gpio_output(GPIO_TypeDef *GPIO, int pin, bool enabled) {
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if (enabled) {
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GPIO->ODR |= (1 << pin);
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} else {
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GPIO->ODR &= ~(1 << pin);
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}
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set_gpio_mode(GPIO, pin, MODE_OUTPUT);
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}
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void set_gpio_alternate(GPIO_TypeDef *GPIO, int pin, int mode) {
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uint32_t tmp = GPIO->AFR[pin>>3];
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tmp &= ~(0xF << ((pin&7)*4));
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tmp |= mode << ((pin&7)*4);
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GPIO->AFR[pin>>3] = tmp;
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set_gpio_mode(GPIO, pin, MODE_ALTERNATE);
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}
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void set_gpio_pullup(GPIO_TypeDef *GPIO, int pin, int mode) {
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uint32_t tmp = GPIO->PUPDR;
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tmp &= ~(3 << (pin*2));
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tmp |= (mode << (pin*2));
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GPIO->PUPDR = tmp;
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}
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int get_gpio_input(GPIO_TypeDef *GPIO, int pin) {
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return (GPIO->IDR & (1U << pin)) == (1U << pin);
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}
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