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42 lines
904 B
42 lines
904 B
#include <stdint.h> |
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#include <mcu/cortex-m.h> |
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#define MCU_STM32F0 |
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#include <mcu/stm32.h> |
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extern int chx_allow_sleep; |
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void |
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chx_sleep_mode (int how) |
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{ |
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PWR->CR |= PWR_CR_CWUF; |
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PWR->CR &= ~(PWR_CR_PDDS|PWR_CR_LPDS); |
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if (how == 0 || how == 1 /* Sleep only (not deepsleep) */) |
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SCB->SCR &= ~SCB_SCR_SLEEPDEEP; |
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else |
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{ /* Deepsleep */ |
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/* how == 2: deepsleep but regulator ON */ |
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if (how == 3) |
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PWR->CR |= PWR_CR_LPDS; /* regulator low-power mode */ |
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else if (how == 4) |
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PWR->CR |= PWR_CR_PDDS; /* Power down: All OFF */ |
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SCB->SCR |= SCB_SCR_SLEEPDEEP; |
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} |
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} |
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void __attribute__((naked)) |
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chx_idle (void) |
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{ |
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int sleep_enabled; |
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for (;;) |
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{ |
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asm ("ldr %0, %1" : "=r" (sleep_enabled): "m" (chx_allow_sleep)); |
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if (sleep_enabled) |
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{ |
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asm volatile ("wfi" : : : "memory"); |
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/* NOTE: it never comes here. Don't add lines after this. */ |
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} |
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} |
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}
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