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+--- Thread: SPI Master (/showthread.php?tid=326)
SPI Master - istillaga - 10-19-2023
Hello i'm using Pulpino's SPI Master part to read a external sensor that it is connected to one of the zedboard's pmod. I have configurated the spi_master_clkgen spi_clk polarity to start in 1. I have done the next code to read the sensor's id but I don't get any success:
#include <utils.h>
#include <stdio.h>
#include <spi.h>
#include <bench.h>
int main() {
int sensor_id;
spi_setup_master(1);
*(volatile int*) (SPI_REG_CLKDIV) = 0x2;
spi_setup_cmd_addr( 0x0f, 8,0,0);
spi_set_datalen(8);
spi_start_transaction(SPI_CMD_RD, SPI_CSN0);
spi_read_fifo(&sensor_id, 8);
printf(" LPS25HB sensor id: 0x%x\n", sensor_id);
return 0;
}
Reviewing the signal with a logic a analizer I got this result: SCLK does as many clocks that spi_Reg_clkdiv value is, the chip select when CS is asserted, it remains asserted indefinitely. MOSI only does one pulse and MISO remains idle.
Anyone can help?
RE: SPI Master - kgf - 10-27-2023
Hard to say.. this looks to be physical, so the first question is actually is the sensor connected properly, reacting to other SPI commands (apart from PULPissimo). Maybe a rate issue, I/O voltage issue ?
RE: SPI Master - istillaga - 11-07-2023
(10-27-2023, 11:24 AM)kgf Wrote: Hard to say.. this looks to be physical, so the first question is actually is the sensor connected properly, reacting to other SPI commands (apart from PULPissimo). Maybe a rate issue, I/O voltage issue ?
Thanks for the response. I have solved it. The problem was in the clock divider