RTEMS 4.8.1 On-Line Library

Console Driver InterruptWrite

BSP and Device Driver Development Guide

8.4.2.2: InterruptWrite

The InterruptWrite is responsible for telling the UART that the len characters at buf are to be transmitted.

static int InterruptWrite(int minor, const char *buf, int len)
{
  tell the UART to transmit len characters from buf
  return 0
}

The driver has to put the n first buf characters in the UART channel minor buffer (n is the UART channel size, n=1 on the MC68640). Generally, an interrupt is raised after these n characters being transmitted. So UART interrupts may have to be enabled after putting the characters in the UART.

BSP and Device Driver Development Guide