stm32的BRR寄存器和BSRR寄存器

科技前沿 • 2025-01-05 15:48 • 阅读 57

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1、BRR--- bit RESET(置0) register //高16位无，低16位置1为0，不能写1

2 、BSRR--- bit SET(设置1或0) register //低16位设置1为0

BSRR：用于低16位的作用是让指定的IO口置1；而高16位的作用是让指定的IO口置0。

 static void IoUartTxd(IO_UART_STRUCT *uart) { if(uart->TxdByteCp < uart->TxdByte) { if(uart->TxdBit == 0)//起始位 { uart->TxdCheck = 0; uart->TxdPort->BRR = uart->TxdPin; //置低 } else if(uart->TxdBit <= 8)//数据位 { if(uart->TxdBuff[uart->TxdByteCp]&(1<<(uart->TxdBit-1))) { uart->TxdCheck++; //记录高电平个数 uart->TxdPort->BSRR = uart->TxdPin; //置高 } else { uart->TxdPort->BRR = uart->TxdPin; //置低 } } else if(uart->Parity && uart->TxdBit <= 9) //校验位 { if(uart->Parity == 1){if(uart->TxdCheck%2){uart->TxdPort->BRR = uart->TxdPin;}else{uart->TxdPort->BSRR = uart->TxdPin;}}//奇校验 if(uart->Parity == 2){if(uart->TxdCheck%2){uart->TxdPort->BSRR = uart->TxdPin;}else{uart->TxdPort->BRR = uart->TxdPin;}}//偶校验 } else //停止位 { uart->TxdPort->BSRR = uart->TxdPin; } if((++uart->TxdBit >= 10 && !uart->Parity) || uart->TxdBit >= 11){uart->TxdBit = 0; uart->TxdByteCp++;} } else if(uart->TxdByteCp > 0) { uart->TxdByte = 0; uart->TxdByteCp = 0; uart->Time->CR1 &= 0xfffe; // 失能 EXTI->IMR |= uart->ExitLine; // 开外部中断 } }

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stm32的BRR寄存器和BSRR寄存器

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