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Showing results for tags 'dma'.
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My Setup: Using a MSP430FR5994 device connected over USB to MSPDebug interface. Implemented DMA transfers using TI's interface found in the driverlib source. Two questions: 1. Is DMA disabled when I am connected to MSPDebug? If so why can I see single transfers between memory locations. 2. When I try to do a block transfer I only see a single word being transferred. Thoughts on why that would be? Here is some code. DMA_disableTransferDuringReadModifyWrite(); dma0Config.channelSelect = DMA_CHANNEL_1; dma0Config.transferModeSelect = DMA_TRANSFER_BLOCK; // CONFIG_SAMPLE_S
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I am trying to read a .wav file from sd card and play it using I2S on CC3200 audio booster in Energia. I have modified the Wifi audio example of CC3200 sdk for this. The dma is setup in ping pong mode and sd card loads data into the buffer but the tx dma interrupt fires only once in primary mode and once in alternate mode. I could not understand why its firing only once. I have configured I2S in stereo mode with 16KHz sampling frequency and 16 bit size. This is my tx dma handler . -
HI EVERYONE, Long time no see. University has been hard, not time for anything. But I am back into the MCU world! And I am having some problems so I first would like to know if anyone ever tried this. I am using a SD card to save data with FATFS. The problem is that the MCU is also doing other stuff... I've been having writes of a few ms which is normal with FATFS. I am considering of course trying to write 512bytes at a time but also implementing DMA on the SPI. But I am not sure the DMA will help. It seems FATFS f_write and the port function disk_write, want to right away
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Hi, I'm implementing an application for CC3200MOD in Energia 1.6.10E18 environment in which host MCU (Atmel AT76C114) sends jpeg image data (size varies from 1MB to 3MB) over SPI to CC3200MOD which then sends it over WiFi to PC. So Atmel acts as SPI master and CC3200MOD SPI slave. The bottleneck is SPI receive rate in CC3200MOD end. I need to configure host MCU SPI clock to 10.5MHz in order to receive correct data on CC3200MOD. With higher clock rate the data gets corrupted. When receiving valid data the transfer rate is 0.17 MBps. This is way too low for our purposes. I have un
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Hi, I'm a bit new to this... I'm wanting to improve the performance of the SPI, I understand that using DMA is the best solution. Are their any example of SPI with DMA? Currently without DMA, I have the SPI setup to send 1 byte at a time with: SPI_transmitData(LCD_EUSCI_MODULE, data); What I want to do is change this so I can fill a buffer with bytes, then say Send. Once thats finished sending I want to fill the buffer again and send the next set of bytes. I tried to use this code although it appears to hang at the last line! DMA_enableModule(); DMA_setControlBase(m_controlTable);
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Hello , I
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Here is some code to drive ws281x strips using DMA driven SPI for the msp430f5529. I hadn't seen any example code showing how to use DMA and SPI. The example also provides some code that shows how to use inline asm that will work with both msp430-gcc and msp430-elf-gcc. The code below was tested with a ws2811 strip and msp430-elf-gcc. https://gist.github.com/RickKimball/9761b8f5a89d46a53939 -rick
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- msp430f5529
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Does anyone have any good sources of performance information for the PL230 uDMA used in Tiva and CC3200 MCUs (or any MCU using the same DMA controller)? I'm used to using MSP430 DMA which is quite clearly specified. Each transfer spends two MCLK cycles accessing the bus (which halts the CPU), plus an extra two cycles each time it's triggered. The synchronisation time required to wake up from various low power modes is also given. The Tiva and CC3200 TRMs don't give any details of this type. I'd like to know how many cycles each transfer takes in the best case, with no contention, arbit
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https://github.com/jmagnuson/fatfs-tiva-cm4f/blob/master/src/third_party/fatfs/port/mmc-tiva-cm4f.c It's still a work in progress, but should be a working drop-in replacement for the MMC driver TI provides. I've only done minimal testing on it thus far, so any corrections or improvements would be greatly appreciated!
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Hi, i would like to move data from ADC12MEM0 from its memory location to a choosen mamoery location by the means of DMA. the ADC is working correctly. Here it follows DMA configuration : __data16_write_addr((unsigned short) &DMA0SA,(unsigned long) ADC_MEM_0_ADDRESS); //SHOULD BE ADC12MEM0 // Source single address __data16_write_addr((unsigned short) &DMA0DA,(unsigned long) IMAGE_START_ADDRESS); // Destination single address DMACTL0 =DMA0TSEL_26; //DMA Trigger Assignments:26==ADC12 end of conversion DMA0SZ =12544; // Block size DMA0CTL = DMADT_4 | DMASRCINCR_0 | DMADSTINCR_3 | DMADS
