--- zzzz-none-000/linux-3.10.107/Documentation/spi/spidev_test.c 2017-06-27 09:49:32.000000000 +0000 +++ scorpion-7490-727/linux-3.10.107/Documentation/spi/spidev_test.c 2021-02-04 17:41:59.000000000 +0000 @@ -15,6 +15,7 @@ #include #include #include +#include #include #include #include @@ -30,43 +31,110 @@ } static const char *device = "/dev/spidev1.1"; -static uint8_t mode; +static uint32_t mode; static uint8_t bits = 8; static uint32_t speed = 500000; static uint16_t delay; +static int verbose; -static void transfer(int fd) +uint8_t default_tx[] = { + 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, + 0x40, 0x00, 0x00, 0x00, 0x00, 0x95, + 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, + 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, + 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, + 0xF0, 0x0D, +}; + +uint8_t default_rx[ARRAY_SIZE(default_tx)] = {0, }; +char *input_tx; + +static void hex_dump(const void *src, size_t length, size_t line_size, char *prefix) +{ + int i = 0; + const unsigned char *address = src; + const unsigned char *line = address; + unsigned char c; + + printf("%s | ", prefix); + while (length-- > 0) { + printf("%02X ", *address++); + if (!(++i % line_size) || (length == 0 && i % line_size)) { + if (length == 0) { + while (i++ % line_size) + printf("__ "); + } + printf(" | "); /* right close */ + while (line < address) { + c = *line++; + printf("%c", (c < 33 || c == 255) ? 0x2E : c); + } + printf("\n"); + if (length > 0) + printf("%s | ", prefix); + } + } +} + +/* + * Unescape - process hexadecimal escape character + * converts shell input "\x23" -> 0x23 + */ +static int unescape(char *_dst, char *_src, size_t len) +{ + int ret = 0; + char *src = _src; + char *dst = _dst; + unsigned int ch; + + while (*src) { + if (*src == '\\' && *(src+1) == 'x') { + sscanf(src + 2, "%2x", &ch); + src += 4; + *dst++ = (unsigned char)ch; + } else { + *dst++ = *src++; + } + ret++; + } + return ret; +} + +static void transfer(int fd, uint8_t const *tx, uint8_t const *rx, size_t len) { int ret; - uint8_t tx[] = { - 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, - 0x40, 0x00, 0x00, 0x00, 0x00, 0x95, - 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, - 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, - 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, - 0xDE, 0xAD, 0xBE, 0xEF, 0xBA, 0xAD, - 0xF0, 0x0D, - }; - uint8_t rx[ARRAY_SIZE(tx)] = {0, }; + struct spi_ioc_transfer tr = { .tx_buf = (unsigned long)tx, .rx_buf = (unsigned long)rx, - .len = ARRAY_SIZE(tx), + .len = len, .delay_usecs = delay, .speed_hz = speed, .bits_per_word = bits, }; + if (mode & SPI_TX_QUAD) + tr.tx_nbits = 4; + else if (mode & SPI_TX_DUAL) + tr.tx_nbits = 2; + if (mode & SPI_RX_QUAD) + tr.rx_nbits = 4; + else if (mode & SPI_RX_DUAL) + tr.rx_nbits = 2; + if (!(mode & SPI_LOOP)) { + if (mode & (SPI_TX_QUAD | SPI_TX_DUAL)) + tr.rx_buf = 0; + else if (mode & (SPI_RX_QUAD | SPI_RX_DUAL)) + tr.tx_buf = 0; + } + ret = ioctl(fd, SPI_IOC_MESSAGE(1), &tr); if (ret < 1) pabort("can't send spi message"); - for (ret = 0; ret < ARRAY_SIZE(tx); ret++) { - if (!(ret % 6)) - puts(""); - printf("%.2X ", rx[ret]); - } - puts(""); + if (verbose) + hex_dump(tx, len, 32, "TX"); + hex_dump(rx, len, 32, "RX"); } static void print_usage(const char *prog) @@ -81,7 +149,13 @@ " -O --cpol clock polarity\n" " -L --lsb least significant bit first\n" " -C --cs-high chip select active high\n" - " -3 --3wire SI/SO signals shared\n"); + " -3 --3wire SI/SO signals shared\n" + " -v --verbose Verbose (show tx buffer)\n" + " -p Send data (e.g. \"1234\\xde\\xad\")\n" + " -N --no-cs no chip select\n" + " -R --ready slave pulls low to pause\n" + " -2 --dual dual transfer\n" + " -4 --quad quad transfer\n"); exit(1); } @@ -101,11 +175,14 @@ { "3wire", 0, 0, '3' }, { "no-cs", 0, 0, 'N' }, { "ready", 0, 0, 'R' }, + { "dual", 0, 0, '2' }, + { "verbose", 0, 0, 'v' }, + { "quad", 0, 0, '4' }, { NULL, 0, 0, 0 }, }; int c; - c = getopt_long(argc, argv, "D:s:d:b:lHOLC3NR", lopts, NULL); + c = getopt_long(argc, argv, "D:s:d:b:lHOLC3NR24p:v", lopts, NULL); if (c == -1) break; @@ -144,20 +221,41 @@ case 'N': mode |= SPI_NO_CS; break; + case 'v': + verbose = 1; + break; case 'R': mode |= SPI_READY; break; + case 'p': + input_tx = optarg; + break; + case '2': + mode |= SPI_TX_DUAL; + break; + case '4': + mode |= SPI_TX_QUAD; + break; default: print_usage(argv[0]); break; } } + if (mode & SPI_LOOP) { + if (mode & SPI_TX_DUAL) + mode |= SPI_RX_DUAL; + if (mode & SPI_TX_QUAD) + mode |= SPI_RX_QUAD; + } } int main(int argc, char *argv[]) { int ret = 0; int fd; + uint8_t *tx; + uint8_t *rx; + int size; parse_opts(argc, argv); @@ -168,11 +266,11 @@ /* * spi mode */ - ret = ioctl(fd, SPI_IOC_WR_MODE, &mode); + ret = ioctl(fd, SPI_IOC_WR_MODE32, &mode); if (ret == -1) pabort("can't set spi mode"); - ret = ioctl(fd, SPI_IOC_RD_MODE, &mode); + ret = ioctl(fd, SPI_IOC_RD_MODE32, &mode); if (ret == -1) pabort("can't get spi mode"); @@ -198,11 +296,21 @@ if (ret == -1) pabort("can't get max speed hz"); - printf("spi mode: %d\n", mode); + printf("spi mode: 0x%x\n", mode); printf("bits per word: %d\n", bits); printf("max speed: %d Hz (%d KHz)\n", speed, speed/1000); - transfer(fd); + if (input_tx) { + size = strlen(input_tx+1); + tx = malloc(size); + rx = malloc(size); + size = unescape((char *)tx, input_tx, size); + transfer(fd, tx, rx, size); + free(rx); + free(tx); + } else { + transfer(fd, default_tx, default_rx, sizeof(default_tx)); + } close(fd);