AM335x处理器运行linux系统时串口如何支持非标波特率通信

我是在Application 設定為38400,然後再driver 將UART2

return port->uartclk/(baud * divisor);

改成return 8 會變成 38400 -> 375000  (將38400替換成375K,測試OK)

你應該可以改成 return 208,這樣就會變成 

48000000/16/208=14400

========================

Application

cfsetispeed(&Opt, B38400);
cfsetospeed(&Opt, B38400);

driver/tty/serials/omap-serials.c

static unsigned int
serial_omap_get_divisor(struct uart_port *port, unsigned int baud)
{
unsigned int divisor;

if (baud > OMAP_MODE13X_SPEED && baud != 3000000)
divisor = 13;
else
divisor = 16;

if(port->line==2)//UART2
{
//port->uartclk => 48000000
//baud => 38400 (AP Set 38400)
//divisor => 16
//port->uartclk/(baud * divisor) => 78 (AP Set 38400)

//48000000/16/8 = 375000
printk(KERN_ERR "UART2 38400 -> 375000 \r\n");
return 8;

}
else
return port->uartclk/(baud * divisor);
}