UART0 not working

[ryan239955]

Posted on February 22, 2008 at 12:17

UART0 not working

[ryan239955]

Posted on May 17, 2011 at 09:50

Hi,

Im new to the ARM cores and to ST micros. I have been able to get my CAN and I/O to work fine but I cant seem to get the UARTS to react at all. I set it up with out FIFO load the DR register and expect to see a frame on the pin but instead all I get is the FR register showing Tx buffer full and UART0 busy. I checked the clock gating and reset holds. Setup up the GPIO 3.0 for RXD and 3.1 for TXD. Its on a reva board and im using Raisonance tool chain. code is as follows:

SCU->PRR1 |= 0x00020000; // release P3 reset

SCU->PCGR1 |= 0x00020000; // clock gating P3

SCU->GPIOIN[3] |= 0x00000001;

GPIO3->DIR &= 0xFE; // Dir input on GPIO3 for pin 0

SCU->GPIOOUT[3] |= 0x00000008

GPIO3->DIR |= 0x02;

// SETUP the UART0

SCU->PRR1 |= 0x00000008; // release UART0 reset

SCU->PCGR1 |= 0x00000008; // clock gating UART0

UART0->CR = 0x0380;

UART0->LCR = 0x0060;

UART0->IBRD = 0x0138;

UART0->FBRD = 0x20;

UART0->ICR = 0x07FF;

UART0->CR |= 0x0001;

UART0->DR = 0x34;

for(;;);

Im sure it something simple but I can't seem to get my head around it.

Ryan

[ryan239955]

Posted on May 17, 2011 at 09:50

Thanks I hope it works with the library and I will try it out today.

But my real problem is with understanding what register I have forgot to initialize to get the UART0 to TX. Is there a way to turn on BRCLK from FMSTR I assume it defaults ON as Fmstr/2 as per the docs.

Ryan

[jilisegiar]

Posted on May 17, 2011 at 09:50

The STR9 library may help you to start with STR9 device. In fact it contains an example for UART. Just update it accordingly to your hardware.

http://www.st.com/mcu/modules.php?name=mcu&file=familiesdocs&FAM=101#Firmware