Changeset 424 for trunk/hal/tsar_mips32/drivers/soclib_tty.h

Timestamp:

Jan 29, 2018, 5:57:05 PM (6 years ago)

Author:

alain

Message:

cosmetic.

File:

• trunk/hal/tsar_mips32/drivers/soclib_tty.h (modified) (1 diff)

trunk/hal/tsar_mips32/drivers/soclib_tty.h

@@ -83 +83 @@
 
 /****************************************************************************************
- * This ISR should be executed only for the TXT_READ and TXT_WRITE commands.
+ * This ISR is executed to handle both the TTY_TX_IRQ and the TTY_RX_IRQ.
+ * - the TTY_RX_IRQ is activated as soon as the TTY_STATUS_RX_FULL bit is set in the
+ *   TTY status register, indicating a character registered in the TTY_READ register.
+ *
+ *   . if it exist a TXT_READ command registered in the command queue, and thit copies the
+ *     character to the command buffer, acknowledges the TTY_RX_IRQ, and unblock the 
+ *     associated server thread.
+     
+ *   . the control characters are directly handled by the txt ^C / ^D /  and the this IRQ ca
+ * 
+ the TXT_READ and TXT_WRITE commands.
  * It gets the command arguments from the first client thread in the TXT chdev queue:
  * - if TXT_READ, it transfers one byte from the TTY_READ_REG to the command buffer.