Christopher Theriault

UART issues on the M52233 DEMO board

Discussion created by Christopher Theriault on Mar 24, 2009
Latest reply on Mar 24, 2009 by Christopher Theriault



I'm using the M52233 DEMO board with Code Warrior version 7.1.  I haven't been able to get any output from the UART channel 1.  If I use code like this:


uart_init(1, SYSTEM_CLOCK_KHZ, kBaud9600);

uart_putchar(1, 'U');


I expect an output that I don't actually get.  If I use these same function calls with channel 0, I see the character come out on an oscilloscope.  Reading around other posts, I see people recommending making sure the GPIO setting for those pins are correct, but going by the schematic for the board the UART TX/RX pins don't seem to be multiplexed with any other IO pins (and I can't find a pin diagram in the 5223x manual).  I'm also not clear if I can leave the RTS/CTS pins floating for channel 1.  They aren't connected on channel 0 when I get it to work there, but the channel 0 pins are also jumpered to the DB9 connection.  I'm not sure what I should look at next.