Need Help w/ MSP430 UART Tx

Started by V Barker in comp.arch.embedded15 years ago 2 replies

Hi, I'm having trouble doing a simple character transmission on the MSP430F149 UART. I'm using SoftBaugh's ES149 eval board...

Hi, I'm having trouble doing a simple character transmission on the MSP430F149 UART. I'm using SoftBaugh's ES149 eval board w/ICC430 compiler. The board has a 32768 Hz clock. I've verifed that it runs through the program. When I probe at pin UTXD0 with an oscope, all I see is a high signal. Can anyone help? Thanks, Valerie #include void main() { //


Masking/Disabling/Missing interrupts

Started by joshc in comp.arch.embedded12 years ago 3 replies

I know this is implementation specific but to make it a little less ambiguous let's deal with an XScale or any ARM core for that matter. Under...

I know this is implementation specific but to make it a little less ambiguous let's deal with an XScale or any ARM core for that matter. Under what conditions would you _miss_ interrupts? Let's say I have a UART that only generates one interrupt to the interrupt controller but the source of this interrupt within the UART can be due to various reasons. For example, maybe there is a FIFO overfl...


UART with I2C bus interface

Started by wb0gaz in comp.arch.embedded14 years ago 6 replies

I'm looking for a UART component with I2C bus interface as a stand-alone part. So far I have only been able to find 16550 type devices in large...

I'm looking for a UART component with I2C bus interface as a stand-alone part. So far I have only been able to find 16550 type devices in large multi-pin packages. Is there such a thing? I would like to have option of 3.3 or 5.0V VCC powering. Dave wb0gaz@hotmail.com


Price about OXCF950 or other CF UART chip

Started by John Liu in comp.arch.embedded15 years ago 2 replies

Does anybody know the approximate price of Oxford OXCF950? or any other High performance single channel UART? We need about 10K per year. Just...

Does anybody know the approximate price of Oxford OXCF950? or any other High performance single channel UART? We need about 10K per year. Just the approximate price, so I can compare it with FPGA solutions. Thanks. John


Software UART driver

Started by Daniel Doron in comp.arch.embedded5 years ago 22 replies

Hi all, I have tried to look an answer for this on the web, but I mainly got "no can do" (timing issue). Kernel: 2.6.3x MCU: atmel at91...

Hi all, I have tried to look an answer for this on the web, but I mainly got "no can do" (timing issue). Kernel: 2.6.3x MCU: atmel at91 (9263) I wish to get/write a driver to bitbang a couple of gpios to emulate a uart. the communication is with a remote PIC (PIC12F683) to which I have already wrote the software and checked with linux terminal. the communication does not have to be fas...


UART 5/6bits char format

Started by HT-Lab in comp.arch.embedded10 years ago 12 replies

Hi all, I just wrote a simple driver for a 16750 UART and wondered if there are still (embedded) systems that use the 5 and 6 bits character...

Hi all, I just wrote a simple driver for a 16750 UART and wondered if there are still (embedded) systems that use the 5 and 6 bits character length format? A quick google search showed that 5 bits/1.5 stopbits were used for old mechanical teletypes, not sure what 6 bits are used for. I assume these formats are no longer used but I might be wrong, Thanks Hans www.ht-lab.com ...


sending data from a USB cell phone to UART Zigbee device

Started by archit in comp.arch.embedded12 years ago 1 reply

I am a FY student doing a project in Zigbee home automation. I want to send an AT command from my smartphone nokia to a UART USB interface for...

I am a FY student doing a project in Zigbee home automation. I want to send an AT command from my smartphone nokia to a UART USB interface for Maxstream Zigbee device. What all do i need to check on to know if this is possible or not? Any help will be greatly appreciated. Thanking You, Archit Chitnis.


STM32F4 DMA question

Started by Tim Wescott in comp.arch.embedded6 years ago 11 replies

So I'm running into a response time issue on a serial port on an STM32F407. I was hoping that I could give myself more time to get to the ISR...

So I'm running into a response time issue on a serial port on an STM32F407. I was hoping that I could give myself more time to get to the ISR by piping the UART receive to the DMA. I got it set up to what appeared to be correct according to the user's manual, and what I ended up with that the DMA will transfer exactly one byte from the UART, then turn itself off. This may give me a ...


MSP430 LPM4, UART wakeup, crashing...

Started by jerry_bp in comp.arch.embedded14 years ago 3 replies

Hi all, I'm currently working in an application that requires the MCU to g into deep sleep (LPM4) and wake up and process data on UART receive,...

Hi all, I'm currently working in an application that requires the MCU to g into deep sleep (LPM4) and wake up and process data on UART receive, an then go back to LPM4. What is the right way to do this? I tried doing th following as TI's guide Rev. E. suggests, but this crashes the MCU. tried to debug the code but I just can't find where the problem is. Th serial data is received using IR, i...


IDEA: ARM stamp SBC ?

Started by rziak in comp.arch.embedded14 years ago 25 replies

Hello, I wonder if anyone makes something like Parallax did with PIC, but populated with ARM ? Anyone selling DIP40 device with ARM and...

Hello, I wonder if anyone makes something like Parallax did with PIC, but populated with ARM ? Anyone selling DIP40 device with ARM and FPGA and ethernet? With bootloader, RTOS and interpreter for fast prototyping? Digi has Connect ME device, but it is not DIP and anly 5 I/Os and UART from the ARM device is accessible. Lantronix has Xport with 3 I/O and UART and they are releasing new...


UART to USB buffering

Started by Sean Whitesell in comp.arch.embedded15 years ago 1 reply

I need a design suggestion on the best way to receive data through the UART. Buffer it, and allow the USB task to pick it up when ready. There...

I need a design suggestion on the best way to receive data through the UART. Buffer it, and allow the USB task to pick it up when ready. There is only two endpoints that the desktop application can see. Because of this we are using an ad-hoc application handshaking method. The app will send a packet with a command that the processor sees as a "Query" command. If no data then the reply is 0 ...


Isolated UART communication

Started by Rohan in comp.arch.embedded12 years ago 3 replies

Hi All, Any suggestions about making high-speed (16k baud) opto-isolated UART communications between 1. Microcoltroller to Microcontroller...

Hi All, Any suggestions about making high-speed (16k baud) opto-isolated UART communications between 1. Microcoltroller to Microcontroller at TTL Levels. 2. RS232 port and microcontroller How do you guys do it. I use two opto couplers (4n35) for receive and transmit side but it has its speed limitations. Thanks, Rohan


Update internal flash through UART

Started by Ivan Z. in comp.arch.embedded10 years ago 2 replies

Hi, I'm working with TMS470R1A384. And I'd like to have ability to update my Program through UART. In others words, I'd like to write...

Hi, I'm working with TMS470R1A384. And I'd like to have ability to update my Program through UART. In others words, I'd like to write FlashLoader. But I have no idea how to write my program for it. I configured *.xcl so as my Program was in Bank_1 and INTVEC too. and my FlashLoader - in Bank_0. But my Programs interrupts use addresses at the beginning anyway. How can I tell tms470 t...


The perfect part except ...

Started by Silver Beetle in comp.arch.embedded13 years ago 9 replies

Greetings. I have a small embedded application to develop that needs 1) a UART, 2) SPI (or other interface for flash-based card memory, SD...

Greetings. I have a small embedded application to develop that needs 1) a UART, 2) SPI (or other interface for flash-based card memory, SD preferred), 3) A/D, 4) D/A (PWM OK), and 5) a USB 2.0 port. The Microchip PICs 18F2550 or 4550 would appear to be a great fit (performance, memory and cost too) except ... They put the UART receive data input (RX) and the SPI data output (SDO) on t...


UART setup for 801C188EB/80186

Started by srao in comp.arch.embedded4 years ago 35 replies

I am having some trouble setting up UART for a 80188 processor. Could someone please point me in the right direction. I think I am making...

I am having some trouble setting up UART for a 80188 processor. Could someone please point me in the right direction. I think I am making the simple program more complicated. the 16 Mega hz freq is configured to baud 9600. void main() { serialinit(); serialput(41); serial_puts("nHello World"); } serialinit() { outport(FF60,80CF); outport(FF74,0x40); } serialput(int n...


Cheap debugging tools, software UART

Started by Jim Stewart in comp.arch.embedded8 years ago 11 replies

Watching all this discussion about debugging with an LED and such, I was wondering if anyone else writes software UARTS for debug info. I've...

Watching all this discussion about debugging with an LED and such, I was wondering if anyone else writes software UARTS for debug info. I've written a 9600 baud tx-only UART for AVR's in 35 assembly instructions. The data out can be inverted so that you can connect the tx I/O pin directly to your terminal without an inverter or driver. Timing is by software timing loops so interrupts...


UART on Sharp 79524

Started by Tom in comp.arch.embedded14 years ago 2 replies

I've implemented an interrupt driven UART handler for a Sharp LH79524 and it seems to be working OK. When I receive a message from my host...

I've implemented an interrupt driven UART handler for a Sharp LH79524 and it seems to be working OK. When I receive a message from my host system then I transmit one back. All seems fine on that front and the two will chat away for hours without any bad packets. If I unplug the comms cable then I get a timeout reported but when I plug it back in comms is restored the next time a message ...


UART behavior for CTS/RTS - Kinetis bugs?

Started by Dave Nadler in comp.arch.embedded3 years ago 22 replies

Hi all - Perhaps some of you have encountered this? The post linked below shows the Kinetis UART continues to transmit after the receiver has...

Hi all - Perhaps some of you have encountered this? The post linked below shows the Kinetis UART continues to transmit after the receiver has de-asserted CTS: https://community.nxp.com/thread/432154 Freescale engineers claim their part is OK and its the other guys fault... Here's my question: As this is an asynchronous link, the receiver can de-assert CTS at any time. What is the tra


Low-cost ARM processor board with 4 (or more) UART

Started by Albert Goodwill in comp.arch.embedded11 years ago 2 replies

Hello, Do you know any low-cost, small size, commercially-off-the-shelf ARM processor board with four (or more) UART (preferably with Linux)...

Hello, Do you know any low-cost, small size, commercially-off-the-shelf ARM processor board with four (or more) UART (preferably with Linux) ? Thx albertgoodwill at gmail com


Baud 1200

Started by terry in comp.arch.embedded15 years ago 6 replies

Hi, I used ATMega16 UART to communicate with a target device which is of baud 1200 but failed. I then tried to communicate the UART with PC...

Hi, I used ATMega16 UART to communicate with a target device which is of baud 1200 but failed. I then tried to communicate the UART with PC COM Port and terminal software. I found the communication is OK when the baud is from 115200 down to 2400. But straight characters appear when the baud rate turns to 1200. My baud setting function is: void uartSetBaudRate(u32 baudrate) { u16 b...