79 lines
1.8 KiB
Plaintext
79 lines
1.8 KiB
Plaintext
(*
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Пример для STM32L152C-DISCO
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Светодиоды мигают по прерыванию от системного таймера.
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*)
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MODULE SysTick;
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IMPORT SYSTEM;
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CONST
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GPIOB = 40020400H;
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GPIOBMODER = GPIOB;
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GPIOBOTYPER = GPIOB + 04H;
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GPIOBOSPEEDR = GPIOB + 08H;
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GPIOBPUPDR = GPIOB + 0CH;
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GPIOBIDR = GPIOB + 10H;
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GPIOBODR = GPIOB + 14H;
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GPIOBBSRR = GPIOB + 18H;
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GPIOBLCKR = GPIOB + 1CH;
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GPIOBAFRL = GPIOB + 20H;
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GPIOBAFRH = GPIOB + 24H;
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GPIOBBRR = GPIOB + 28H;
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RCC = 40023800H;
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RCC_CR = RCC;
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RCC_AHBENR = RCC + 1CH;
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RCC_APB2ENR = RCC + 20H;
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RCC_APB1ENR = RCC + 24H;
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STK = 0E000E010H;
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STK_CTRL = STK;
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ENABLE = {0};
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TICKINT = {1};
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CLKSOURCE = {2};
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STK_LOAD = STK + 04H;
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STK_VAL = STK + 08H;
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STK_CALIB = STK + 0CH;
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Blue = 6;
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Green = 7;
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VAR
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x: SET; state: BOOLEAN;
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(* обработчик прерываний от System tick timer *)
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PROCEDURE tick [15];
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BEGIN
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state := ~state;
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(* включить или выключить светодиоды *)
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SYSTEM.PUT(GPIOBBSRR, {Blue + 16 * ORD(state)});
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SYSTEM.PUT(GPIOBBSRR, {Green + 16 * ORD(state)})
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END tick;
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BEGIN
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state := FALSE;
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(* подключить GPIOB *)
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SYSTEM.GET(RCC_AHBENR, x);
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SYSTEM.PUT(RCC_AHBENR, x + {1});
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(* настроить PB6 и PB7 на выход *)
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SYSTEM.GET(GPIOBMODER, x);
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SYSTEM.PUT(GPIOBMODER, x + {12, 14} - {13, 15});
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(* настроить и запустить SysTick *)
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SYSTEM.PUT(STK_LOAD, 1048576);
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SYSTEM.PUT(STK_CTRL, ENABLE + TICKINT + CLKSOURCE);
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END SysTick. |