Posted inanalog3 CAN tech notes

MCP2515 beyond 1MHz

For archival purpose: http://can-bus.996267.n3.nabble.com/Anybody-ever-run-an-MCP2515-at-greater-than-1Mbps-td1859.html you are certainly right about 1Mbps being the maximum speed of the official CAN spec. However, some of us like to break the rules :) I do :) I'm using CAN for a purpose different from controlling automobile so my breaking rule would not cause any death.
Posted inanalog3 PSoC tech notes

Use USB-UART Bridge on PSoC CY8CKIT-049-42xx Kit

You need miniprog3 to program this, despite typical programming to this kit is via boot loader. 1. Put a SCB UART component. Change baud rate to 9600. 2. Assign pins as follows: UART RX : P4[0] UART TX : P4[1] 3. And then, here is the main.c source code int main() { CyGlobalIntEnable; /* Enable global interrupts. */ /* Place your initialization/startup code here (e.g. MyInst_Start()) */ UART_1_Start(); UART_1_UartPutString("Hello world from CY8CKIT-049-42xx\r\n"); for(;;) { /* Place your application code here. */ } } 4. Build it, program it, and connect the CY8CKIT-049-42xx to the PC. That's it.
Posted inanalog3 tech notes

Generating MCP2515 SPI ‘READ’ Operation Request Using PSoC 42xx

PSoC 42xx provides SPI component that supports up to 4MHz clock speed. Communicating with MCP2515 via this component, however, is not straightforward when you try the highest clock speed. The problem is concept of 'operation' of MCP2515. An operation consists of multiple SPI bytes bundled by 'enable' signal on the CS pin. Lowering the CS pin initiates an operation and it must stay low during the data transmission. See following timing chart quoted from the MCP2515 datasheet. The PSoC SPI component lacks direct control on the CS pin signal. The component automatically lowers the CS level when the write API puts a byte to Tx FIFO and the component's internal…