联客易网站建设制作,微信网页登录wordpress,centos打开wordpress,网站怎么做优化百度能搜索到因为这款单片机没有硬件串口#xff0c;所以需要我们自己做软件模拟串口。
用PA3作为RX#xff0c;因为PA3可以作为外部输入中断EXTI1。
本人首先用轮询的方式查PA3是否从高电平跳变到低电平#xff08;起始信号#xff09;#xff0c;但是因为还有别的业务逻辑#xf…因为这款单片机没有硬件串口所以需要我们自己做软件模拟串口。
用PA3作为RX因为PA3可以作为外部输入中断EXTI1。
本人首先用轮询的方式查PA3是否从高电平跳变到低电平起始信号但是因为还有别的业务逻辑导致查询到低电平的时候不能确定此时低电平过了多少us导致后续数据采样时间点不正确 实时性较差。
改用中断了以后问题解决。
GPIO初始化代码如下
void Ny8b072a_Gpio_Init(void)
{AWUCON C_PA1_Wakeup; // Enable PA1 input change wakeup functionIOSTA C_PA0_Input | C_PA1_Input | C_PA2_Input | C_PA3_Input | C_PA6_Input | C_PA7_Input ; // set PA0/1/3/6/7 to input modeAPHCON (unsigned char)~( C_PA0_PHB | C_PA1_PHB | C_PA2_PHB| C_PA3_PHB | C_PA6_PHB | C_PA7_PHB ); // Enable PA0/1/3/6/7 Pull-High Resistor,others disablePORTA 0x20; // PA5 output high//PA3INTEDG C_INT1_En | C_INT1_FallingEdge; // External interrupt 1 will be set while rising edge occurs on pin PA4INTE C_INT_EXT1 | C_INT_PABKey; // Enable External interrupt PortB input change interruptBWUCON C_PB5_Wakeup; // Enable PB5 input change wakeup functionIOSTB C_PB5_Input | C_PB7_Input; // Set PB5/7 to input mode,others set to output modeBPHCON (unsigned char)~( C_PB5_PHB | C_PB7_PHB);PORTB 0x0F; // PB0/1/2/3 output highIOSTC C_PC_Output;PORTC 0x03; // PC0/1 output highCPHCON (unsigned char)~( C_PC0_PHB | C_PC1_PHB);
}
用了休眠功能EXTI也可以唤醒。 中断里面接收代码如下
volatile unsigned int g_i 0;
unsigned char g_uart_rx_length 0;
unsigned char g_uart_rx_buff[13] {0};//! interrupt service routine
void isr(void) __interrupt(0)
{ if(INTFbits.INT1IF){ App_Delay_Us(26); //消抖52us//起始信号if(0 REMOTE_RX_IO){//INTEDG 0; //PA4 is gpiowhile(1){for(g_i 0; g_i 8; g_i){g_uart_rx_buff[g_uart_rx_length] 1;App_Delay_Us(59); //104USif(1 REMOTE_RX_IO){g_uart_rx_buff[g_uart_rx_length] | 0x80;}}App_Delay_Us(59); //104US// 结束信号if(1 REMOTE_RX_IO){if ( (\n g_uart_rx_buff[g_uart_rx_length]) || (12 g_uart_rx_length ) ){//INTEDG C_INT1_En | C_INT1_FallingEdge; // External interrupt 0 will be set while rising edge occurs on pin PA4//INTE C_INT_EXT1; // Enable External interrupt PortB input change interruptINTF (unsigned char)~(C_INT_EXT1); // Clear INT0IF(External interrupt 0 flag bit)return;}else{g_uart_rx_length;//wait for new startwhile (1 REMOTE_RX_IO);App_Delay_Us(26); }}else{//INTEDG C_INT1_En | C_INT1_FallingEdge; // External interrupt 0 will be set while rising edge occurs on pin PA4//INTE C_INT_EXT1; // Enable External interrupt PortB input change interruptINTF (unsigned char)~(C_INT_EXT1); // Clear INT0IF(External interrupt 0 flag bit)return;}}}else{INTF (unsigned char)~(C_INT_EXT1); // Clear INT0IF(External interrupt 0 flag bit) return;}}
}//16M 2T 2.5us
//App_Delay_Us(26); //52US
//App_Delay_Us(59); //104US
void App_Delay_Us(unsigned int count)
{ for(; count 0; count--);
}
波特率9600 每一bit的时间是1/9600104us所以两个延时一个是52us一个是104us
延时函数是用示波器看过的这里配置的是16M 2T
TX因为用不上所有没有去实现不过思路是相同的把IO口改为输出即可。
