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90 lines
2.1 KiB
C
90 lines
2.1 KiB
C
#include "SWM221.h"
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void SerialInit(void);
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int main(void)
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{
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SystemInit();
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SerialInit();
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/* 测试说明：
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将 PA5 与 PB4 连接，示波器观察 PA5 与 PB5 波形，可观察到 PA5 上较宽的脉冲被复制到了 PB5 上，但较窄的波形没有
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*/
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GPIO_INIT(GPIOA, PIN5, GPIO_OUTPUT);
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GPIO_INIT(GPIOB, PIN4, GPIO_INPUT_PullUp);
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EXTI_Init(GPIOB, PIN4, EXTI_BOTH_EDGE); //双边沿触发中断
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NVIC_EnableIRQ(GPIOB_IRQn);
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EXTI_Open(GPIOB, PIN4);
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GPIO_INIT(GPIOB, PIN5, GPIO_OUTPUT);
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IOFILT_Init(0, IOFILT0_PB4, IOFILT_WIDTH_8us); // 宽度小于 8us 的脉冲被滤除掉
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while(1==1)
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{
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int i;
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GPIO_InvBit(GPIOA, PIN5);
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for(i = 0; i < 2; i++) __NOP();
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GPIO_InvBit(GPIOA, PIN5);
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for(i = 0; i < 20; i++) __NOP();
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GPIO_InvBit(GPIOA, PIN5);
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for(i = 0; i < 200; i++) __NOP();
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GPIO_InvBit(GPIOA, PIN5);
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for(i = 0; i < 2000; i++) __NOP();
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}
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}
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void GPIOB_Handler(void)
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{
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EXTI_Clear(GPIOB, PIN4);
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GPIOB->DATAPIN5 = GPIOB->DATAPIN4;
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}
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void SerialInit(void)
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{
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UART_InitStructure UART_initStruct;
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PORT_Init(PORTA, PIN0, PORTA_PIN0_UART0_RX, 1); //GPIOA.0配置为UART0 RXD
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PORT_Init(PORTA, PIN1, PORTA_PIN1_UART0_TX, 0); //GPIOA.1配置为UART0 TXD
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UART_initStruct.Baudrate = 57600;
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UART_initStruct.DataBits = UART_DATA_8BIT;
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UART_initStruct.Parity = UART_PARITY_NONE;
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UART_initStruct.StopBits = UART_STOP_1BIT;
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UART_initStruct.RXThreshold = 3;
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UART_initStruct.RXThresholdIEn = 0;
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UART_initStruct.TXThreshold = 3;
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UART_initStruct.TXThresholdIEn = 0;
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UART_initStruct.TimeoutTime = 10;
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UART_initStruct.TimeoutIEn = 0;
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UART_Init(UART0, &UART_initStruct);
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UART_Open(UART0);
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}
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/******************************************************************************************************************************************
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* 函数名称: fputc()
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* 功能说明: printf()使用此函数完成实际的串口打印动作
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* 输 入: int ch 要打印的字符
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* FILE *f 文件句柄
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* 输 出: 无
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* 注意事项: 无
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******************************************************************************************************************************************/
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int fputc(int ch, FILE *f)
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{
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UART_WriteByte(UART0, ch);
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while(UART_IsTXBusy(UART0));
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return ch;
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}
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