Control the state of multiple IOs through the serial port

guominele

Purpose of code: There are 50 IO ports to be controlled, all of which are high level in static state. Now you need to use the serial port to control the IO ports to be pulled low. You can select any of the 50 ports to be pulled low. For example, if the serial port sends a 50-bit data, where the 20th, 25th, and 30th bits are 0 and the rest are 1, it means that the corresponding three IO ports are low level and return to high level after a delay, and the rest remain unchanged. For example:
if((USART_RX_BUF[0]-'0') == 0)
{
LED0 = 0;
delay_ms(500);
LED0 = 1;
}

南以浅

Not difficult. Are the 50 IOs an extension? Or is it the controller itself?