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68 lines
1.9 KiB
68 lines
1.9 KiB
/*
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GPIO MODULE
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Copyright (C) 2017-2019 by Xose Pérez <xose dot perez at gmail dot com>
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*/
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#include <bitset>
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constexpr const size_t GPIO_PINS = 16;
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std::bitset<GPIO_PINS> _gpio_locked;
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std::bitset<GPIO_PINS> _gpio_available;
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bool gpioValid(unsigned char gpio) {
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if (gpio >= GPIO_PINS) return false;
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return _gpio_available.test(gpio);
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}
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bool gpioGetLock(unsigned char gpio) {
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if (gpioValid(gpio)) {
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if (!_gpio_locked.test(gpio)) {
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_gpio_locked.set(gpio);
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DEBUG_MSG_P(PSTR("[GPIO] GPIO%u locked\n"), gpio);
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return true;
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}
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}
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DEBUG_MSG_P(PSTR("[GPIO] Failed getting lock for GPIO%u\n"), gpio);
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return false;
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}
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bool gpioReleaseLock(unsigned char gpio) {
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if (gpioValid(gpio)) {
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_gpio_locked.reset(gpio);
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DEBUG_MSG_P(PSTR("[GPIO] GPIO%u lock released\n"), gpio);
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return true;
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}
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DEBUG_MSG_P(PSTR("[GPIO] Failed releasing lock for GPIO%u\n"), gpio);
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return false;
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}
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void gpioSetup() {
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// https://github.com/espressif/esptool/blob/f04d34bcab29ace798d2d3800ba87020cccbbfdd/esptool.py#L1060-L1070
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// "One or the other efuse bit is set for ESP8285"
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// https://github.com/espressif/ESP8266_RTOS_SDK/blob/3c055779e9793e5f082afff63a011d6615e73639/components/esp8266/include/esp8266/efuse_register.h#L20-L21
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// "define EFUSE_IS_ESP8285 (1 << 4)"
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const uint32_t efuse_blocks[4] {
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READ_PERI_REG(0x3ff00050),
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READ_PERI_REG(0x3ff00054),
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READ_PERI_REG(0x3ff00058),
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READ_PERI_REG(0x3ff0005c)
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};
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const bool esp8285 = (
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(efuse_blocks[0] & (1 << 4))
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|| (efuse_blocks[2] & (1 << 16))
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);
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for (unsigned char pin=0; pin < GPIO_PINS; ++pin) {
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if (pin <= 5) _gpio_available.set(pin);
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if (((pin == 9) || (pin == 10)) && (esp8285)) _gpio_available.set(pin);
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if (12 <= pin && pin <= 15) _gpio_available.set(pin);
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}
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}
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