Use SPI instead of i2c AN00184

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packetloss69
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Posts: 1
Joined: Thu Feb 14, 2019 6:36 am

Use SPI instead of i2c AN00184

Postby packetloss69 » Tue Feb 19, 2019 9:24 pm

Hi xCore Exchange users.
Trying to impliment spi instead o i2c in AN00184_cdc_extended_explorer

Integrated bits from AN00160_using _SPI_master. (Tested fine on its own)

Interfaces created to facilitate comms between main.xc and app_virtual_com_extended.xc seems to be an issue.

Code: Select all

   
interface usb_cdc_interface cdc_data;
interface spi_master_if i_spi[1];


main.xc

Code: Select all

// Copyright (c) 2016, XMOS Ltd, All rights reserved

#include <platform.h>
#include <xs1.h>
#include "usb.h"
//#include "i2c.h"
#include "xud_cdc.h"
#include "app_virtual_com_extended.h"
#include <spi.h>

// I2C interface ports
on tile[0]: port p_scl = XS1_PORT_1E;
on tile[0]: port p_sda = XS1_PORT_1F;

/* These ports are used for the SPI master */
out buffered port:32   p_sclk  = on tile[0]: XS1_PORT_1A;
out port               p_ss[1] = on tile[0]: {XS1_PORT_1D};
out buffered port:32   p_mosi  = on tile[0]: XS1_PORT_1O;
in buffered port:32    p_miso  = on tile[0]: XS1_PORT_1P;

/* USB Endpoint Defines */
#define XUD_EP_COUNT_OUT   2    //Includes EP0 (1 OUT EP0 + 1 BULK OUT EP)
#define XUD_EP_COUNT_IN    3    //Includes EP0 (1 IN EP0 + 1 INTERRUPT IN EP + 1 BULK IN EP)

int main() {
    /* Channels to communicate with USB endpoints */
    chan c_ep_out[XUD_EP_COUNT_OUT], c_ep_in[XUD_EP_COUNT_IN];
    /* Interface to communicate with USB CDC (Virtual Serial) */
    interface usb_cdc_interface cdc_data;
    interface spi_master_if i_spi[1];
    /* I2C interface */
    //i2c_master_if i2c[1];

    par
    {
        on USB_TILE: xud(c_ep_out, XUD_EP_COUNT_OUT, c_ep_in, XUD_EP_COUNT_IN, null, XUD_SPEED_HS, XUD_PWR_SELF);
        on USB_TILE: Endpoint0(c_ep_out[0], c_ep_in[0]);
        on USB_TILE: CdcEndpointsHandler(c_ep_in[1], c_ep_out[1], c_ep_in[2], cdc_data);
        //on tile[0]: app_virtual_com_extended(cdc_data, i2c[0]);
        //on tile[0]: i2c_master(i2c, 1, p_scl, p_sda, 10);
        on tile[0]: spi_master(i_spi, 1, p_sclk, p_mosi, p_miso, p_ss, 1, null);
        on tile[0]: app_virtual_com_extended(cdc_data, i_spi[0]);
    }
    return 0;
}



app_virtual_com_extended.xc

Code: Select all

// Copyright (c) 2016, XMOS Ltd, All rights reserved

#include <platform.h>
#include <xs1.h>
#include <stdio.h>
#include <string.h>
#include <timer.h>
#include "i2c.h"
#include "xud_cdc.h"

/* App specific defines */
#define MENU_MAX_CHARS  30
#define MENU_LIST       11

char app_menu[MENU_LIST][MENU_MAX_CHARS] = {
        {"\n\r-------------------------\r\n"},
        {"XMOS USB Virtual COM Demo\r\n"},
        {"-------------------------\r\n"},
        {"1. Switch to Echo mode\r\n"},
        {"2. Toggle LED 1\r\n"},
        {"3. Toggle LED 2\r\n"},
        {"4. Toggle LED 3\r\n"},
        {"5. Toggle LED 4\r\n"},
        {"6. Read Accelerometer\r\n"},
        {"7. Print timer ticks\r\n"},
        {"-------------------------\r\n"},
};

char echo_mode_str[3][30] = {
        {"Entered echo mode\r\n"},
        {"Press Ctrl+Z to exit it\r\n"},
        {"\r\nExit echo mode\r\n"},
};

#define ARRAY_SIZE(x) (sizeof(x)/sizeof(x[0]))

/* Sends out the App menu over CDC virtual port*/
void show_menu(client interface usb_cdc_interface cdc)
{
    unsigned length;
    for(int i = 0; i < MENU_LIST; i++) {
        length = strlen(app_menu[i]);
        cdc.write(app_menu[i], length);
    }
}

/* Application task */
//void app_virtual_com_extended(client interface usb_cdc_interface cdc, client interface i2c_master_if i2c)
void app_virtual_com_extended(client interface usb_cdc_interface cdc, client interface spi_master_if spi)
{
    char value, tmp_string[50];
  //  app_init(spi);
    show_menu(cdc);

    while(1)
    {
        /* Check if user has input any character */
        if(cdc.available_bytes())
        {
            value = cdc.get_char();

            /* Do the chosen operation */
            if(value == '1') {
                show_menu(cdc);
            }
        }
    } /* end of while(1) */
}



In: void app_virtual_com_extended(client interface usb_cdc_interface cdc, client interface spi_master_if spi)

Cannot ever get past during compiling:
../src/app_virtual_com_extended.xc:49:78: error: interface declared inside parameter list
void app_virtual_com_extended(client interface usb_cdc_interface cdc, client interface spi_master_if spi)
^~~~~~~~~~~~~~~~~~~~~~~
../src/app_virtual_com_extended.xc:49:71: error: parameter `spi' has incomplete type
void app_virtual_com_extended(client interface usb_cdc_interface cdc, client interface spi_master_if spi)
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~


The i2c implementation seems similar, both being typedef interface i2c_master_if { .. as well as typedef interface spi_master_if {
Any input would be greatly appreciated.
CousinItt
Experienced Member
Posts: 106
Joined: Wed May 31, 2017 6:55 pm

Postby CousinItt » Wed Feb 20, 2019 12:47 pm

You don't need to use the keyword interface in the parameter list. For example spi_master_if has already been declared to be an interface in its type definition, so you just have client spi_master_if spi in your function declaration.

Same applies for the interface declarations, for example

Code: Select all

spi_master_if i_spi[1];

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