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Found 5 results

  1. Hi, I'm trying to use an old stellaris launchpad board as a datalogger to an SD card for logging data from an accelerometer. I've already built such a project on the arduino hardware but best I can do is one reading per 2ms and I want to get it logging faster... at least 1 reading every 500us. So I thought I would port it onto the the launchpad boards I had kicking around. Straight up the SD card didn't work trying to use SPI(3) as the underlying SPI bus and I have downloaded and tried about 6 different sd card libraries but got nowhere. What I then did was go back to first principles. Confirm SPI is working on the default SPI bus SPI(2) before switching to SPI3 and before putting the SD libraries on top of it. So I grabbed the simplest SPI product I had, a microchip MCP4251 digital pot and wired it up on a breadboard and confirmed it fully working at 5v with the arduino. The MCP4251 is specced for 3.3v @10Mhz so presumably there should be no issue using it with the launchpad. When I wired it to the launchpad it didn't work. It sort of worked for one of the digital pot's channels but not for the other. It's sort of stuck on power up settings but the behaviour is not logical so I cannot diagnose a problem. I tried the clock divider to slow it down a bit to check if that was the case but to no effect. I tried setting the SPI modes to 0 and 1 as per the pots datasheet and I tried manually pulling down the CS earlier but it seems that the SPI library does something that disables access to the CS pin. Checking and comparing the signals at the chip with a scope they all "appear" correct but I only have a 2 channel scope and no logic analyser so I cannot check it with enough detail to confirm. I can bit bang it but want to do it in hardware. I swapped the pot for 2 others I have and they all perform (or don't perform) exactly the same. There's some sonsistency there at least. At this stage i'm left with wondering if there's an issue with the energia SPI library. Not something I would have expected to be the case as SPI is pretty basic functionality but you never know. Alternatively it's possibly an issue with using the library. Unfortunately there are no examples of SPI usage which are relevant as they all use the msp430. If anyone has an example that they can confirm working against a Microchip product It would be much appreciated. I'm using energia given i'm trying to port arduino code but happy to use CCS which i've used for other projects. I'm at work and don't have the code with me which is why I havent posted code. Regards, David
  2. This is a very simple enc28j60 library created by Renato Aloi for atmega modifed by me for MSP430G2553 and MSP430F5529 Please, check my latest master fork from Renato Aloi newMods branch or download directly v0.4.2: EtherEncLib-0.4.2.zip fix CS, fix examples, disable debug from tcpstack EtherEncLib-0.4.zip only harware SPI version (MSP430G2553 and MSP430F5529 tested) EtherEncLib_v03.zip - hard/soft spi version EtherEncLib_v2.zip - hardware spi version EtherEncLib_v01.zip - softspi version v03: selectable hardware/software spi all definitions moved to EtherEncLib.h lines 17,18 -> select between hard/soft spi lines 21,23-25 -> SPI pins definition for MSP430 lines 28,30-32,34 -> SPI pins definition for Stellaris & Tiva(?) v02: hardware spi version enctypes.h file contains CS pins definition (lines 247, 250) v01: init version At this moment, after my quick mod, spi communication work on softspi (shiftOut/shiftIn) and replace strange arduino access via registers like SPDR etc... So...shiftOut/shiftIn are not so fast enctypes.h file contains pins definition (lines 247-259) description from EtherEncLib.cpp file:
  3. Hello, im barely new in ARM programming. What i want to do is to run four independent PWM channels to manage my things. I wrote some code and as i supposed it didint work. In debug process i checked registers and it seems to be ok. Load and match values are corerct so i think error is somewhere in timers configuration. Can someone help me out ? Thanks in advance for reply. Here is my code that i ran on my launchpad. #define PART_LM4F120H5QR 1 #include <inc/hw_types.h> #include <inc/hw_memmap.h> #include <driverlib/sysctl.h> #include <driverlib/gpio.h> #include <driverlib/pin_map.h> #include <driverlib/timer.h> #define PWM_FREQ 20000 void InitGPIOs() { // running clock for gpio C SysCtlPeripheralEnable(SYSCTL_PERIPH_GPIOC); } void InitPWMs() { // runing clock for timers: wide timer 0 and wide timer 1, both 64 bits SysCtlPeripheralEnable(SYSCTL_PERIPH_WTIMER0); SysCtlPeripheralEnable(SYSCTL_PERIPH_WTIMER1); TimerConfigure(WTIMER0_BASE, TIMER_CFG_SPLIT_PAIR | TIMER_CFG_A_PWM); // timer0 A TimerConfigure(WTIMER0_BASE, TIMER_CFG_SPLIT_PAIR | TIMER_CFG_B_PWM); // timer0 B TimerConfigure(WTIMER1_BASE, TIMER_CFG_SPLIT_PAIR | TIMER_CFG_A_PWM); // timer1 A TimerConfigure(WTIMER1_BASE, TIMER_CFG_SPLIT_PAIR | TIMER_CFG_B_PWM); // timer1 B // 20 khz freq TimerLoadSet(WTIMER0_BASE, TIMER_A, (SysCtlClockGet()/PWM_FREQ)-1 ); TimerLoadSet(WTIMER0_BASE, TIMER_B, (SysCtlClockGet()/PWM_FREQ)-1 ); TimerLoadSet(WTIMER1_BASE, TIMER_A, (SysCtlClockGet()/PWM_FREQ)-1 ); TimerLoadSet(WTIMER1_BASE, TIMER_B, (SysCtlClockGet()/PWM_FREQ)-1 ); // initial width value TimerMatchSet(WTIMER0_BASE, TIMER_A, (SysCtlClockGet()/PWM_FREQ)/2); TimerMatchSet(WTIMER0_BASE, TIMER_B, (SysCtlClockGet()/PWM_FREQ)/2); TimerMatchSet(WTIMER1_BASE, TIMER_A, (SysCtlClockGet()/PWM_FREQ)/2); TimerMatchSet(WTIMER1_BASE, TIMER_B, (SysCtlClockGet()/PWM_FREQ)/2); // enabling timers TimerEnable(WTIMER0_BASE, TIMER_A); TimerEnable(WTIMER0_BASE, TIMER_; TimerEnable(WTIMER1_BASE, TIMER_A); TimerEnable(WTIMER1_BASE, TIMER_; // pin muxing for pwms GPIOPinConfigure(GPIO_PC4_WT0CCP0); GPIOPinTypeTimer(GPIO_PORTC_BASE, GPIO_PIN_4); GPIOPinConfigure(GPIO_PC5_WT0CCP1); GPIOPinTypeTimer(GPIO_PORTC_BASE, GPIO_PIN_5); GPIOPinConfigure(GPIO_PC6_WT1CCP0); GPIOPinTypeTimer(GPIO_PORTC_BASE, GPIO_PIN_6); GPIOPinConfigure(GPIO_PC7_WT1CCP1); GPIOPinTypeTimer(GPIO_PORTC_BASE, GPIO_PIN_7); } int main() { // setting clock to maximum speed 80 Mhz SysCtlClockSet(SYSCTL_USE_PLL | SYSCTL_SYSDIV_2_5 | SYSCTL_XTAL_16MHZ | SYSCTL_OSC_MAIN); InitGPIOs(); InitPWMs(); while(true) { } return 0; }
  4. Hi, guys. I am a beginner in Stellaris microcontroller programming. I try to generate a delay of 1 sec (1 sec - led ON, 1 sec - led OFF). I have selected the timer0A - 16 bits. Delay - 1sec. Frequency = 4 MHz T = 1 / 4Mhz = 250 nsec. So, to generate a delay of 1 sec : nsec / 250 nsec = 4.000.000 4.000.000 = 62.500 * 64; But i think in my code i must set another bit, i dont know if it is correct, his name "main interrupt". Here is my code :
  5. Hi! Is there a reference design for board using LM4F120H5QR in case I want to create a custom board based on this chip? (Stellaris Launchpad is quite big for my project). Ideally in Eagle format. Or at least is there a library that contains LM4F120H5QR part so I can create such reference design?