100 lines
2.7 KiB
C
100 lines
2.7 KiB
C
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// spiram_test.c
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//
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// Example program for bcm2835
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// Shows how to interface with SPI RAM such as 23K256-I/P
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// using the spiram little library
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//
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// Tested on RPI 3 Model B, Raspbian Jessie
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// Tested at full speed over many hours with no errors.
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//
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// Connect RPi 3 B to 23K256-I/P like this:
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// RPi pin Function 23K256-I/P pin (name)
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// J1-6 GND 4 (VSS)
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// J1-1 3.3V 8 (VCC)
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// and 7 (/HOLD)
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// J1-19 SPI0_MOSI 5 (SI)
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// J1-21 SPI0_MISO 2 (SO)
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// J1-23 SPI0_SCLK 6 (SCK)
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// J1-24 SPI0_CE0_N 1 (/CS)
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//
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// After installing bcm2835, you can build this
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// with something like:
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// gcc -o spiram_test spiram.c spiram_test.c -l bcm2835
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// sudo ./spiram_test
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//
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// Or you can test it before installing with:
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// gcc -o spiram_test -I ../../src ../../src/bcm2835.c spiram.c spiram_test.c
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// sudo ./spiram_test
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//
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// Author: Mike McCauley
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// Copyright (C) 2018 Mike McCauley
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// $Id: $
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#include <bcm2835.h>
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#include <stdio.h>
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#include <string.h> // memcmp
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#include "spiram.h"
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int main(int argc, char **argv)
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{
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if (!bcm2835_init())
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{
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printf("bcm2835_init failed. Are you running as root??\n");
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return 1;
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}
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if (!bcm2835_spi_begin())
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{
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printf("bcm2835_spi_begin failed. Are you running as root??\n");
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return 1;
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}
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if (!spiram_begin())
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{
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printf("spiram_begin failed.\n");
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return 1;
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}
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/* You can speed things up by selecting a faster SPI speed
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// after spiram_begin, which defaults to BCM2835_SPI_CLOCK_DIVIDER_65536 = 6.1035156kHz on RPI3
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*/
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bcm2835_spi_setClockDivider(BCM2835_SPI_CLOCK_DIVIDER_64); // 6.25MHz on RPI3
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uint8_t value = 0;
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uint16_t address = 0x0000;
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while (1)
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{
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uint8_t ret;
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/* ret = spiram_read_sr();*/
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spiram_write_byte(address, value);
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ret = spiram_read_byte(address);
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if (ret != value)
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printf("ERROR: spiram_read_byte address %04x got %02x, expected %02x\n", address, ret, value);
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#if 0
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printf("spiram_read_byte at address %04x got %02x\n", address, ret);
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#endif
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uint8_t write_page_buf[SPIRAM_PAGE_SIZE] = { 0, value, value, value };
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uint8_t read_page_buf[SPIRAM_PAGE_SIZE];
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spiram_write_page(address, write_page_buf);
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spiram_read_page(address, read_page_buf);
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if (memcmp(write_page_buf, read_page_buf, SPIRAM_PAGE_SIZE) != 0)
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printf("ERROR: spiram_read_page at address %04x\n", address);
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#if 0
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printf("spiram_read_page address %04x got ", address);
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int i;
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for (i = 0; i < SPIRAM_PAGE_SIZE; i++)
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printf("%02x ", read_page_buf[i]);
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printf("\n");
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#endif
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/* sleep(1); */
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value++;
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address++;
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}
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spiram_end();
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bcm2835_close();
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return 0;
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}
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