pikeyd165 – Blame information for rev 1
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| Rev | Author | Line No. | Line |
|---|---|---|---|
| 1 | office | 1 | // spiram_test.c |
| 2 | // |
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| 3 | // Example program for bcm2835 |
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| 4 | // Shows how to interface with SPI RAM such as 23K256-I/P |
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| 5 | // using the spiram little library |
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| 6 | // |
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| 7 | // Tested on RPI 3 Model B, Raspbian Jessie |
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| 8 | // Tested at full speed over many hours with no errors. |
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| 9 | // |
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| 10 | // Connect RPi 3 B to 23K256-I/P like this: |
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| 11 | // RPi pin Function 23K256-I/P pin (name) |
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| 12 | // J1-6 GND 4 (VSS) |
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| 13 | // J1-1 3.3V 8 (VCC) |
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| 14 | // and 7 (/HOLD) |
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| 15 | // J1-19 SPI0_MOSI 5 (SI) |
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| 16 | // J1-21 SPI0_MISO 2 (SO) |
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| 17 | // J1-23 SPI0_SCLK 6 (SCK) |
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| 18 | // J1-24 SPI0_CE0_N 1 (/CS) |
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| 19 | // |
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| 20 | // After installing bcm2835, you can build this |
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| 21 | // with something like: |
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| 22 | // gcc -o spiram_test spiram.c spiram_test.c -l bcm2835 |
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| 23 | // sudo ./spiram_test |
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| 24 | // |
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| 25 | // Or you can test it before installing with: |
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| 26 | // gcc -o spiram_test -I ../../src ../../src/bcm2835.c spiram.c spiram_test.c |
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| 27 | // sudo ./spiram_test |
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| 28 | // |
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| 29 | // Author: Mike McCauley |
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| 30 | // Copyright (C) 2018 Mike McCauley |
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| 31 | // $Id: $ |
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| 32 | |||
| 33 | #include <bcm2835.h> |
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| 34 | #include <stdio.h> |
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| 35 | #include <string.h> // memcmp |
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| 36 | #include "spiram.h" |
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| 37 | |||
| 38 | int main(int argc, char **argv) |
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| 39 | { |
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| 40 | if (!bcm2835_init()) |
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| 41 | { |
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| 42 | printf("bcm2835_init failed. Are you running as root??\n"); |
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| 43 | return 1; |
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| 44 | } |
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| 45 | |||
| 46 | if (!bcm2835_spi_begin()) |
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| 47 | { |
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| 48 | printf("bcm2835_spi_begin failed. Are you running as root??\n"); |
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| 49 | return 1; |
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| 50 | } |
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| 51 | if (!spiram_begin()) |
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| 52 | { |
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| 53 | printf("spiram_begin failed.\n"); |
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| 54 | return 1; |
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| 55 | } |
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| 56 | /* You can speed things up by selecting a faster SPI speed |
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| 57 | // after spiram_begin, which defaults to BCM2835_SPI_CLOCK_DIVIDER_65536 = 6.1035156kHz on RPI3 |
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| 58 | */ |
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| 59 | bcm2835_spi_setClockDivider(BCM2835_SPI_CLOCK_DIVIDER_64); // 6.25MHz on RPI3 |
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| 60 | |||
| 61 | uint8_t value = 0; |
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| 62 | uint16_t address = 0x0000; |
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| 63 | while (1) |
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| 64 | { |
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| 65 | uint8_t ret; |
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| 66 | |||
| 67 | /* ret = spiram_read_sr();*/ |
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| 68 | spiram_write_byte(address, value); |
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| 69 | ret = spiram_read_byte(address); |
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| 70 | if (ret != value) |
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| 71 | printf("ERROR: spiram_read_byte address %04x got %02x, expected %02x\n", address, ret, value); |
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| 72 | #if 0 |
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| 73 | printf("spiram_read_byte at address %04x got %02x\n", address, ret); |
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| 74 | #endif |
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| 75 | |||
| 76 | uint8_t write_page_buf[SPIRAM_PAGE_SIZE] = { 0, value, value, value }; |
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| 77 | uint8_t read_page_buf[SPIRAM_PAGE_SIZE]; |
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| 78 | spiram_write_page(address, write_page_buf); |
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| 79 | |||
| 80 | spiram_read_page(address, read_page_buf); |
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| 81 | if (memcmp(write_page_buf, read_page_buf, SPIRAM_PAGE_SIZE) != 0) |
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| 82 | printf("ERROR: spiram_read_page at address %04x\n", address); |
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| 83 | #if 0 |
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| 84 | printf("spiram_read_page address %04x got ", address); |
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| 85 | int i; |
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| 86 | for (i = 0; i < SPIRAM_PAGE_SIZE; i++) |
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| 87 | printf("%02x ", read_page_buf[i]); |
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| 88 | printf("\n"); |
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| 89 | #endif |
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| 90 | /* sleep(1); */ |
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| 91 | value++; |
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| 92 | address++; |
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| 93 | } |
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| 94 | |||
| 95 | spiram_end(); |
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| 96 | bcm2835_close(); |
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| 97 | return 0; |
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| 98 | } |
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| 99 |