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62 lines
1.2 KiB
62 lines
1.2 KiB
9 years ago
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#include "common.h"
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#include "gpio.h"
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static uint32_t rcc_gpio_mask(uint32_t gpio)
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{
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switch (gpio) {
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case GPIOA: return RCC_AHBENR_GPIOAEN;
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case GPIOB: return RCC_AHBENR_GPIOBEN;
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case GPIOC: return RCC_AHBENR_GPIOCEN;
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case GPIOD: return RCC_AHBENR_GPIODEN;
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case GPIOE: return RCC_AHBENR_GPIOEEN;
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case GPIOF: return RCC_AHBENR_GPIOFEN;
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case GPIOG: return RCC_AHBENR_GPIOGEN;
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case GPIOH: return RCC_AHBENR_GPIOHEN;
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default: return 0;
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}
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}
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void gpio_enable(uint32_t gpio)
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{
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RCC_AHBENR |= rcc_gpio_mask(gpio);
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}
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void gpio_disable(uint32_t gpio)
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{
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RCC_AHBENR &= ~rcc_gpio_mask(gpio);
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}
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void gpio_set_af(uint32_t gpio, uint32_t pins, enum GPIO_AF af)
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{
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gpio_enable(gpio);
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volatile uint32_t *moder = (uint32_t *) gpio + GPIO_MODER_offs;
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volatile uint64_t *afr = (uint64_t *) gpio + GPIO_AFR_offs;
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BitFieldLoop(i, m, 16) {
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if (pins & m) {
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*moder &= ~(0b11 << i * 2);
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*moder |= 0b10 << i * 2;
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*afr &= ~(0xF << i * 4);
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*afr |= af << i * 4;
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}
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};
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}
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void gpio_set_mode(uint32_t gpio, uint32_t pins, enum GPIO_MODE mode)
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{
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volatile uint32_t *moder = (uint32_t *) gpio + GPIO_MODER_offs;
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BitFieldLoop(i, m, 16) {
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if (pins & m) {
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*moder &= ~(0b11 << i * 2);
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*moder |= mode << i * 2;
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}
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};
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}
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