LPC Microcontrollers中的主题 UART TXD

UART TXD

lpcware — Wed, 15 Jun 2016 20:02:36 GMT

Content originally posted in LPCWare by Lba0129 on Fri Mar 13 05:15:23 MST 2015
Hi I have copy some code from the net, and then rearrange it to my project.
I would like to have a TX debug pin. And I set up the uart and sends the data to the uart. But nothing happens on PIO_04, any ideas ?

Here is my code.
void uart0Init(uint32_t baudRate)
{
uint32_t clk;
const uint32_t UARTCLKDIV=1;
GPIOSetPortBitDir(PORT0, TXD_PIN, SET_AS_OUTPUT);
LPC_SWM->PINENABLE0 |= (1<<0); //Disable ACIMP

LPC_SWM->PINASSIGN0 = (0xffffff00 + TXD_PIN);
/* Setup the clock and reset UART0 */
LPC_SYSCON->UARTCLKDIV = UARTCLKDIV;
// ctl_mask_isr(UART0_IRQn);//NVIC_DisableIRQ(UART0_IRQn);
LPC_SYSCON->SYSAHBCLKCTRL |= (1 << 14);
LPC_SYSCON->PRESETCTRL    &= ~(1 << 3);
LPC_SYSCON->PRESETCTRL    |= (1 << 3);

/* Configure UART0 */
clk = SystemCoreClock/UARTCLKDIV;
LPC_USART0->CFG = UART_DATA_LENGTH_8 | UART_PARITY_NONE | UART_STOP_BIT_1;
LPC_USART0->BRG = clk / 16 / baudRate - 1;
LPC_SYSCON->UARTFRGDIV = 0xFF;
LPC_SYSCON->UARTFRGMULT = (((clk / 16) * (LPC_SYSCON->UARTFRGDIV + 1)) /
    (baudRate * (LPC_USART0->BRG + 1))) - (LPC_SYSCON->UARTFRGDIV + 1);

/* Clear the status bits */
LPC_USART0->STAT = UART_STATUS_CTSDEL | UART_STATUS_RXBRKDEL;

/* enable rx interrupts (http://jaromir.xf.cz/phone/phone1.html) */
// LPC_USART0->INTENSET = (1 << 0);

/* Enable UART0 interrupt */
// ctl_unmask_isr(UART0_IRQn);//NVIC_EnableIRQ(UART0_IRQn);

/* Enable UART0 */
LPC_USART0->CFG |= UART_ENABLE;
}

void uart0SendChar(char buffer)
{
/* Wait until we're ready to send */
while (!(LPC_USART0->STAT & UART_STATUS_TXRDY));
LPC_USART0->TXDATA = buffer;
}

void uart0SendByte(uint8_t buffer)
{
    /* Wait until we're ready to send */
    while (!(LPC_USART0->STAT & UART_STATUS_TXRDY));
    LPC_USART0->TXDATA = buffer;
}

void uart0Send(char *buffer, uint32_t length)
{
while (length != 0)
{
    uart0SendChar(*buffer);
    buffer++;
    length--;
}
}

Best regadrs
Lars

Re: UART TXD

lpcware — Wed, 15 Jun 2016 20:02:37 GMT

Content originally posted in LPCWare by nerd herd on Mon Mar 16 07:40:00 MST 2015
Hi Lba0129,

What MCU and board is in your possession? Also, NXP has an LPCOpen software platform which is essentially a bunch of sample projects (including UART) that we support in three IDEs: Keil uVision, IAR EWARM, and our free Eclipse based LPCXpresso. I'd rather trust our code rather than someone else's floating around the internet ;)

Here's a link to the download page for the LPC800 series:

http://www.lpcware.com/content/nxpfile/lpcopen-software-development-platform-lpc8xx-packages

Re: UART TXD

lpcware — Wed, 15 Jun 2016 20:02:38 GMT

Content originally posted in LPCWare by Lba0129 on Thu Mar 26 14:16:28 MST 2015
Hi Sorry has been around I use Rowley so non of them.

I have looks at the one for LPC expresso but think they are twinkled together with a lot of common files.

So I haven't found the solution yet.

Re: UART TXD

lpcware — Wed, 15 Jun 2016 20:02:38 GMT

Content originally posted in LPCWare by xianghuiwang on Sat Mar 28 09:55:53 MST 2015
I would recommand using Tx ( Rx) as gpio to test out your hardware. Or at least probe it out for continuity.
Once the hardware is confirmed, bring up a functioning LPCOpen project. Debug into your project and the LPCOpen project to compare your system, uart clock initialization related register setting as well as status register setting/reading to see if something is not set up properly.
Just reading a big portion of untested code can take some time.
Regards！

Re: UART TXD

lpcware — Wed, 15 Jun 2016 20:02:39 GMT

Content originally posted in LPCWare by Lba0129 on Mon Mar 30 06:44:54 MST 2015
This is okay by me, I made it around to use the ROM Api. and then i figure out that I had move it to the wrong pin, so simpel can it be 0:)

Lars