Crystal Load Capacitance

Started by steve in comp.arch.embedded3 days ago 11 replies

I am using a Atmel4SD32C processor. For the main clock crystal Atmel specifiey the following requirements: CLEXT Maximum External Capacitor on...

I am using a Atmel4SD32C processor. For the main clock crystal Atmel specifiey the following requirements: CLEXT Maximum External Capacitor on XIN and XOUT 17 pF Allowed Crystal Capacitance Load From crystal specification 12.5 – 17.5 pF CLOAD Internal Equivalent Load Capacitance Integrated load capacitance (XIN and XOUT in series) 7.5min 9.5typical 10.5 pFmax Calculation f


RS485 over optical fiber cable

Started by pozz in comp.arch.embedded6 days ago 32 replies

I'd like to replace an electrical cable with a fiber cable, mainly for electromagnetic noise immunity and long distance (I need to reach...

I'd like to replace an electrical cable with a fiber cable, mainly for electromagnetic noise immunity and long distance (I need to reach 500m). The bitrate will be very low: 9600bps is ok. I need to keep the cost low as possible. I never used fiber cables before. In similar applications I used RS485 transceivers connected to the UART peripheral of an MCU. I think I need a fiber optic c...


ODB++ PDB CAD Data

Started by Anonymous in comp.arch.embedded7 days ago 2 replies

I am having an old board made and am being asked for ODB++ format CAD data files. It seems this is to facilitate the creation of the various...

I am having an old board made and am being asked for ODB++ format CAD data files. It seems this is to facilitate the creation of the various machine control files. I'm told it can also support locating traces to assist in debugging. My CAD package doesn't support this. Would it be a hard thing for the developers to add? https://www.odb-sa.com/wp-content/uploads/odb_spec_user-


$0.03 microcontroller

Started by Clifford Heath in comp.arch.embedded1 week ago 102 replies

OTP, no SPI, UART or I²C, but still... Clifford Heath

OTP, no SPI, UART or I²C, but still... Clifford Heath


Embedded Linux - Delay control implemented for Marvell 88E6352/1 also works for 88E6320

Started by Wojciech M. Zabolotny in comp.arch.embedded3 weeks ago

Hi, I have faced a problem with communication via Ethernet switch Marvell 88E6320 connected to the Xilinx ZynqMP chip via RGMII...

Hi, I have faced a problem with communication via Ethernet switch Marvell 88E6320 connected to the Xilinx ZynqMP chip via RGMII interface. The whole problem and its resolution is described here: https://forums.xilinx.com/t5/Embedded-Linux/Problem-with-Marvell-88E6320-connected-to-GEM3-in-Zy nqMP/m-p/904302/highlight/false#M29845 The solution simply applies to 88E6320 chip the method t


How to transmit the value of an enumeration

Started by pozz in comp.arch.embedded3 weeks ago 16 replies

enum type_t { TYPE_1, TYPE_2, ... TYPE_100, } void tx_byte(unsigned char c); enum type_t t; ... tx_byte((unsigned...

enum type_t { TYPE_1, TYPE_2, ... TYPE_100, } void tx_byte(unsigned char c); enum type_t t; ... tx_byte((unsigned char)t); If the maximum value in the enumeration is lower than 256, you can cast to (unsigned char) and transmit it as a byte. However the receiver must have the same enumeration. The transmitter and the receiver must agreed on *the exact values*...


Just HOW does the gputils linker allocate the program memory?

Started by Johann Klammer in comp.arch.embedded4 weeks ago 1 reply

Hello, I have been writing a larger project and seeing huge gaps in the map file(0x374-0xe00). I've put all the regular code in PGM CODE...

Hello, I have been writing a larger project and seeing huge gaps in the map file(0x374-0xe00). I've put all the regular code in PGM CODE sections But some things needed specific addresses... in main.asm I have: ... DEVID CODE (with a matching section in the linker file) .. vectors CODE 0x00 .. PROG0 CODE ... in cmd.asm I have: PROG0 CODE ... in trig.asm I have: PGM CODE...


24C16A EEPROM programmer

Started by pozz in comp.arch.embedded1 month ago 1 reply

I have some 24C16A to program. I have a working 24C16A to clone. What is a fast and cheap way to proceed? I need a software and an hardware...

I have some 24C16A to program. I have a working 24C16A to clone. What is a fast and cheap way to proceed? I need a software and an hardware interface (USB to IIC or RS232 to IIC). I have a PicKit2, but I'm not sure if they can be used to program IIC EEPROM. If yes, what is the software to use? I could write a simple firmware for an MCU with IIC that connects to a PC (via RS232 or...


Supermicro server motherboards with hardware backdoor?

Started by Clifford Heath in comp.arch.embedded1 month ago 36 replies

Whether it turns out to be true or not, this will be the biggest security blockbuster of the decade. Clifford Heath

Whether it turns out to be true or not, this will be the biggest security blockbuster of the decade. Clifford Heath


How do you read digital inputs from microswitch, jumpers, dip-switches...?

Started by pozz in comp.arch.embedded1 month ago 27 replies

Often I have digital inputs connected to switches managed by the user. For example: microswitches, tactile switches, push-buttons,...

Often I have digital inputs connected to switches managed by the user. For example: microswitches, tactile switches, push-buttons, dip-switches, simple jumpers and so on. What is your preferred method to read the status of this inputs? I usually arrange a debounce method for reading push-buttons and similars (tactile switches, micro-switches...) and I know there are many (many many) ...


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