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| author | Marc Schink <flashrom-dev@marcschink.de> | 2016-03-17 16:07:23 +0100 |
|---|---|---|
| committer | Nico Huber <nico.h@gmx.de> | 2018-08-30 09:55:57 +0000 |
| commit | 7ecfe48b19c3e97341a3f2b0d85e7367ab92f2b6 (patch) | |
| tree | 8114881424b47ca6c3044e39da8e16615001887b /ch341a_spi.c | |
| parent | af499198a49fe342a0bb3dbbfa362b8788a8fb4e (diff) | |
| download | flashrom-7ecfe48b19c3e97341a3f2b0d85e7367ab92f2b6.tar.gz flashrom-7ecfe48b19c3e97341a3f2b0d85e7367ab92f2b6.tar.bz2 flashrom-7ecfe48b19c3e97341a3f2b0d85e7367ab92f2b6.zip | |
helpers: Add reverse_byte() and reverse_bytes()
Change-Id: I9d2e1e2856c835d22eed3b3a34bc0379773dd831
Signed-off-by: Marc Schink <flashrom-dev@marcschink.de>
Reviewed-on: https://review.coreboot.org/28086
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Nico Huber <nico.h@gmx.de>
Diffstat (limited to 'ch341a_spi.c')
| -rw-r--r-- | ch341a_spi.c | 13 |
1 files changed, 2 insertions, 11 deletions
diff --git a/ch341a_spi.c b/ch341a_spi.c index 9ebda0d3a..83d5ccf35 100644 --- a/ch341a_spi.c +++ b/ch341a_spi.c @@ -274,15 +274,6 @@ static int32_t config_stream(uint32_t speed) return ret; } -/* ch341 requires LSB first, swap the bit order before send and after receive */ -static uint8_t swap_byte(uint8_t x) -{ - x = ((x >> 1) & 0x55) | ((x << 1) & 0xaa); - x = ((x >> 2) & 0x33) | ((x << 2) & 0xcc); - x = ((x >> 4) & 0x0f) | ((x << 4) & 0xf0); - return x; -} - /* The assumed map between UIO command bits, pins on CH341A chip and pins on SPI chip: * UIO CH341A SPI CH341A SPI name * 0 D0/15 CS/1 (CS0) @@ -372,7 +363,7 @@ static int ch341a_spi_spi_send_command(struct flashctx *flash, unsigned int writ *ptr++ = CH341A_CMD_SPI_STREAM; unsigned int i; for (i = 0; i < write_now; ++i) - *ptr++ = swap_byte(*writearr++); + *ptr++ = reverse_byte(*writearr++); if (read_now) { memset(ptr, 0xFF, read_now); read_left -= read_now; @@ -387,7 +378,7 @@ static int ch341a_spi_spi_send_command(struct flashctx *flash, unsigned int writ unsigned int i; for (i = 0; i < readcnt; i++) { - *readarr++ = swap_byte(rbuf[writecnt + i]); + *readarr++ = reverse_byte(rbuf[writecnt + i]); } return 0; |