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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?

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 ?

(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