Posted on May 17, 2011 at 09:50Hi,
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
