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https://github.com/cnlohr/lolra.git
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cnlohr
52 lines
1.2 KiB
C
52 lines
1.2 KiB
C
// This file is under the standard MIT license, CC0 or Public domain. you choose.
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// CNLohr <>< 2024
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// It just does a normal PWM output from a ch32v203
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#include "ch32v003fun.h"
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#include <stdio.h>
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#define LEDPIN PD6
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int main()
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{
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SystemInit();
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Delay_Ms( 100 );
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funGpioInitAll();
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RCC->APB1PCENR |= RCC_APB1Periph_TIM2;
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// PD4 = T2C1 on 003, PA0 on the 203.
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funPinMode( PA0, GPIO_CFGLR_OUT_50Mhz_AF_PP );
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funPinMode( PA1, GPIO_CFGLR_OUT_50Mhz_AF_PP );
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funPinMode( LEDPIN, GPIO_CFGLR_OUT_50Mhz_PP );
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// Reset TIM2 to init all regs
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RCC->APB1PRSTR |= RCC_APB1Periph_TIM2;
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RCC->APB1PRSTR &= ~RCC_APB1Periph_TIM2;
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TIM2->PSC = 0x0000; // Prescalar
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TIM2->ATRLR = 4; // loop = fclk / (atrlr+1)
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TIM2->CHCTLR1 = TIM_OC1M_2 | TIM_OC1M_1 | TIM_OC1PE | TIM_OC1FE;
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TIM2->CTLR1 = TIM_ARPE;
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TIM2->CCER = TIM_CC1E | TIM_CC1P | TIM_CC1NE;
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TIM2->SWEVGR = TIM_UG;
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// Enable TIM2
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TIM2->CTLR1 |= TIM_CEN;
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TIM2->CH1CVR = TIM2->ATRLR/2+1;
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printf( "Setup\n" );
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while(1)
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{
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TIM2->CH1CVR = 2;
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TIM2->CCER = TIM_CC1E | TIM_CC1P;
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funDigitalWrite( LEDPIN, 1 );
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Delay_Us( 20000 );
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TIM2->CCER = TIM_CC1E;
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TIM2->CH1CVR = 2;
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funDigitalWrite( LEDPIN, 0 );
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Delay_Us( 20000 );
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}
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}
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