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Revise the subroutine of Exercise 8.22 so that the subroutine returns after having written the byte to the data register. This allows the processor to continue with other work while the controller transmits the byte. You will need to keep track of whether the controller is busy so that a subsequent call to the subroutine does not overwrite the data register while transmission is still in progress.
Exercise 8.22
Write a Gumnut subroutine to transmit a byte of data using the serial output controller of Exercise 8.21. Assume the data register is a port address 24 and that there are no other interrupt sources in the system. The subroutine should wait in standby mode and not return until the controller interrupts to indicate that the transmission is complete.
Exercises 8.21
Design a serial output controller for connection to the Gumnut core using the Wishbone bus. The controller should transmit each 8-bit data byte written to a data register using NRZ encoding with one start bit and one stop bit, as shown in Figure 8.35 on page 355. Transmission should occur at 9600 bits per second, with a transmit timing derived from a system clock with frequency 39.321600MHz ( 9600 4096). When the stop bit has been transmitted, the controller should set an interrupt request output. The interrupt request output should be reset when the Gumnut int_ack signal is 1.
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