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25 ноября
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MiniMax (25.01.2007 00:21, просмотров: 1) ответил Nikolas на Подскажите, кто пользовал PWM у LPC2xxx.
Это мой рабочий пример для LPC2138 и GNU ARM GCC void InitPWM() { /* Initialize PWM2/4/6*/ PINSEL0 &= (~(1UL<<14)); PINSEL0 |= (1UL<<15); // Enable PWM2 PINSEL0 &= (~(1UL<<16)); PINSEL0 |= (1UL<<17); // Enable PWM4 PINSEL0 &= (~(1UL<<18)); PINSEL0 |= (1UL<<19); // Enable PWM6 PWMPR = 0x1; //Load prescaler PWMPCR = 0x5400; //PWM channels 2,4,6, single edge control, output enabled PWMMCR = 1; //On match with timer reset the counter PWMMR0 = 0x0FFF; //set cycle rate PWMMR2 = 0; //set init value PWMMR4 = 0; //set init value PWMMR6 = 0; //set init value PWMLER = 0x55; //enable shadow latch for match 2,4,6 PWMTCR = 0x02; //Reset counter and prescaler PWMTCR = 0x09; //Enable counter and PWM, release counter from reset } // ... PWMMR2 = value; PWMLER = (1<<2); //set latch to update PWM register next cycle ... PWMMR4 = value; PWMLER = (1<<4); //set latch to update PWM register next cycle ... PWMMR6 = value; PWMLER = (1<<6); //set latch to update PWM register next cycle