diff options
Diffstat (limited to 'linux_spi.c')
| -rw-r--r-- | linux_spi.c | 22 |
1 files changed, 19 insertions, 3 deletions
diff --git a/linux_spi.c b/linux_spi.c index d994389..2ae681f 100644 --- a/linux_spi.c +++ b/linux_spi.c @@ -57,6 +57,10 @@ int linux_spi_init(void) { char *p, *endp, *dev; uint32_t speed = 0; + /* FIXME: make the following configurable by CLI options. */ + /* SPI mode 0 (beware this also includes: MSB first, CS active low and others */ + const uint8_t mode = SPI_MODE_0; + const uint8_t bits = 8; dev = extract_programmer_param("dev"); if (!dev || !strlen(dev)) { @@ -81,19 +85,31 @@ int linux_spi_init(void) return 1; } + if (register_shutdown(linux_spi_shutdown, NULL)) + return 1; + /* We rely on the shutdown function for cleanup from here on. */ + if (speed > 0) { if (ioctl(fd, SPI_IOC_WR_MAX_SPEED_HZ, &speed) == -1) { - msg_perr("%s: failed to set speed %dHz: %s\n", + msg_perr("%s: failed to set speed to %d Hz: %s\n", __func__, speed, strerror(errno)); - close(fd); return 1; } msg_pdbg("Using %d kHz clock\n", speed); } - if (register_shutdown(linux_spi_shutdown, NULL)) + if (ioctl(fd, SPI_IOC_WR_MODE, &mode) == -1) { + msg_perr("%s: failed to set SPI mode to 0x%02x: %s\n", + __func__, mode, strerror(errno)); return 1; + } + + if (ioctl(fd, SPI_IOC_WR_BITS_PER_WORD, &bits) == -1) { + msg_perr("%s: failed to set the number of bits per SPI word to %u: %s\n", + __func__, bits == 0 ? 8 : bits, strerror(errno)); + return 1; + } register_spi_programmer(&spi_programmer_linux); |
