ms6511 over spi

[kamil]

I found some misunderstanding about SPI using.

I need to read some 16bit registers from MS5611:


If I try to read using non-blocking function:

Code: Select all

txbuf[0] = MS5611_CMD_PROM_READ_C1;
txbuf[1] = 0x00;
rxbuf[0] = 0x00;
rxbuf[1] = 0x00;

spiStartExchange(&MS5611_SPI, 2, txbuf, rxbuf);
chThdSleepMilliseconds(10);

values reads great, but if I use blocking function:

Code: Select all

spiExchange(&MS5611_SPI, 2, txbuf, rxbuf);

spiExchange function blocks and doesn't return.

What I can miss? Or maybe I dons't understand something?

[Giovanni]

From the code you posted I see nothing wrong. The SPI driver is very stable so the cause should be elsewhere, like a DMA conflict or something else.

Giovanni