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Search results 1-6 of 6.

Tuesday, November 14th 2017, 1:53pm

Author: karidavidsson

eMMC power consumption

Setting the FS_SetMaxSectorSize() to the same as the formatted sector size ( I had it set to 512 for some forgotten reason) helps a lot. It takes the access down to 5ms or thereabout. brg kd

Friday, November 10th 2017, 7:18pm

Author: karidavidsson

eMMC power consumption

Followup: The access duration (writing 4096bytes) is approx. 40mS either with USE_OS set to 0 or 1 in file FS_MMC_CM_HW_LPC1857_KEIL_MCB1800.c. During those 40mS the chip is drawing 15-20mA. The access duration on the NAND chip on the other hand is less than 5mS current draw during those 5mS is maybe a little less than for the eMMC. So the main culprit for the high current consumption of the eMMC is the long time that the eMMC is accessed for. Acccessing the same eMMC chip with USB bridge USB264...

Friday, November 10th 2017, 1:47pm

Author: karidavidsson

eMMC power consumption

Hello, I am experimenting with eMMC flash (Sandisk 16GB) and comparing to a NAND flash chip (Micron 1GB). In both cases I am using the emFile and chips formatted as FAT fs. I am writing 20KB/s in 4KB chunks. MCU is lpc1857. What I find is that the current consumption of the eMMC is approx 10x the current consumption of the NAND for the same data throughput. Since I am not an expert on eMMC: Are there any "hidden" switches or low power modes for the eMMC that can be activated? brg kd

Friday, October 27th 2017, 8:07pm

Author: karidavidsson

Change CPU frequency after OS_Start();

I have the urgent need to mess with my MCU's clock frequency. (LPC1857 running at 30MHZ). What is the best strategy to change CPU frequency on a running system to keep the OS content? Or is that supported at all?

Tuesday, October 3rd 2017, 12:58pm

Author: karidavidsson

Creating MBR partitions

To answare my own question... Use FS_CreateMBR(). I do not know how I missed it in the emFile documentation.

Tuesday, October 3rd 2017, 12:42pm

Author: karidavidsson

Creating MBR partitions

Do I have any options to generate MBR partitions on a eMMC from within emFile?