FreeCalypso > hg > freecalypso-hwlab
view lcdtest/showppm.c @ 56:d4357e6d6679
checking in some Calypso JTAG experiments
author | Mychaela Falconia <falcon@freecalypso.org> |
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date | Sun, 12 May 2019 04:11:30 +0000 |
parents | 1d8c499711f1 |
children |
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#include <stdio.h> #include <ctype.h> #include <stdlib.h> #include <unistd.h> char *ppm_filename; FILE *ppmfile; int ppm_is_ascii; /* P3 format instead of P6 */ /* * This function reads one ASCII-encoded integer from a PPM file. * It handles the white space and comment rules of the PPM format. */ static int ppm_get_ascii_number() { int accum, c; do { c = getc(ppmfile); if (c < 0) { badeof: fprintf(stderr, "%s: unexpected EOF\n", ppm_filename); return(-1); } if (c == '#') { do c = getc(ppmfile); while (c >= 0 && c != '\n'); if (c != '\n') goto badeof; } } while (isspace(c)); if (!isdigit(c)) { fprintf(stderr, "%s: unexpected data where a number was expected\n", ppm_filename); return(-1); } for (accum = c - '0'; ; ) { c = getc(ppmfile); if (c < 0 || isspace(c)) break; if (!isdigit(c)) { fprintf(stderr, "%s: bad character in the middle of a number\n", ppm_filename); return(-1); } accum = accum * 10 + c - '0'; } return accum; } /* * This function reads and parses the PPM header of our input file. */ static int ppm_read_header() { int magic1, magic2; int rd; magic1 = getc(ppmfile); magic2 = getc(ppmfile); if (magic1 == 'P' && magic2 == '3') ppm_is_ascii = 1; else if (magic1 == 'P' && magic2 == '6') ppm_is_ascii = 0; else { fprintf(stderr, "%s: P3 or P6 format expected\n", ppm_filename); return(-1); } rd = ppm_get_ascii_number(); if (rd < 0) return(-1); if (rd != 176) { fprintf(stderr, "%s: width is not 176\n", ppm_filename); return(-1); } rd = ppm_get_ascii_number(); if (rd < 0) return(-1); if (rd != 220) { fprintf(stderr, "%s: height is not 220\n", ppm_filename); return(-1); } rd = ppm_get_ascii_number(); if (rd < 0) return(-1); if (rd != 255) { fprintf(stderr, "%s: maxval is not 255\n", ppm_filename); return(-1); } return(0); } /* * This function reads a single R, G or B value from a PPM file. */ static int ppm_get_pixval() { int c; if (ppm_is_ascii) return ppm_get_ascii_number(); c = getc(ppmfile); if (c < 0) { fprintf(stderr, "%s: EOF while reading binary pixel data\n", ppm_filename); return(-1); } return c; } static int ppm_get_rgb() { int r, g, b; r = ppm_get_pixval(); if (r < 0) return(-1); g = ppm_get_pixval(); if (g < 0) return(-1); b = ppm_get_pixval(); if (b < 0) return(-1); /* convert to 5:6:5 */ r >>= 3; g >>= 2; b >>= 3; return (r << 11) | (g << 5) | b; } cmd_show(argc, argv) char **argv; { int rc; unsigned n; u_char ftbuf[176*220*6+3], *dp; ppm_filename = argv[1]; ppmfile = fopen(ppm_filename, "r"); if (!ppmfile) { perror(ppm_filename); return(-1); } rc = ppm_read_header(); if (rc < 0) { fclose(ppmfile); return(-1); } write_ir(0x20); write_dr(0); write_ir(0x21); write_dr(0); write_ir(0x22); /* GPIO setup */ dp = ftbuf; *dp++ = 0x82; *dp++ = 0x03; *dp++ = 0x03; for (n = 0; n < 176*220; n++) { rc = ppm_get_rgb(); if (rc < 0) { fclose(ppmfile); return(-1); } /* upper byte */ *dp++ = 0x92; *dp++ = 0; /* dummy addr */ *dp++ = rc >> 8; /* lower byte */ *dp++ = 0x92; *dp++ = 0; /* dummy addr */ *dp++ = rc; } fclose(ppmfile); do_ftdi_write(ftbuf, sizeof ftbuf); return(0); } cmd_cd(argc, argv) char **argv; { if (chdir(argv[1]) < 0) { perror(argv[1]); return(-1); } return(0); }