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| author | Marcus Comstedt <marcus@mc.pp.se> | 2011-05-28 16:55:52 +0200 |
|---|---|---|
| committer | Andrzej Zaborowski <andrew.zaborowski@intel.com> | 2011-05-28 16:20:43 +0200 |
| commit | 2eb9f241824d000fcd90bd7f4b49e40b88e62975 (patch) | |
| tree | 08d231f45abff02e4c377da0bb01e2aa4198c569 /hw/bitbang_i2c.c | |
| parent | 42a623c7db82865a9224c15cbace27b2acd65834 (diff) | |
| download | focaccia-qemu-2eb9f241824d000fcd90bd7f4b49e40b88e62975.tar.gz focaccia-qemu-2eb9f241824d000fcd90bd7f4b49e40b88e62975.zip | |
bitbang_i2c: Fix spurious slave read after NACK
After NACKing a read operation, a raising SCL should not trigger a new read from the slave. Introduce a new state which just waits for a stop or start condition after NACK. Signed-off-by: Marcus Comstedt <marcus@mc.pp.se> Signed-off-by: Andrzej Zaborowski <andrew.zaborowski@intel.com>
Diffstat (limited to 'hw/bitbang_i2c.c')
| -rw-r--r-- | hw/bitbang_i2c.c | 5 |
1 files changed, 4 insertions, 1 deletions
diff --git a/hw/bitbang_i2c.c b/hw/bitbang_i2c.c index 4ee99a18b9..2937b5c4a1 100644 --- a/hw/bitbang_i2c.c +++ b/hw/bitbang_i2c.c @@ -38,7 +38,8 @@ typedef enum bitbang_i2c_state { RECEIVING_BIT2, RECEIVING_BIT1, RECEIVING_BIT0, - SENDING_ACK + SENDING_ACK, + SENT_NACK } bitbang_i2c_state; struct bitbang_i2c_interface { @@ -115,6 +116,7 @@ int bitbang_i2c_set(bitbang_i2c_interface *i2c, int line, int level) } switch (i2c->state) { case STOPPED: + case SENT_NACK: return bitbang_i2c_ret(i2c, 1); case SENDING_BIT7 ... SENDING_BIT0: @@ -155,6 +157,7 @@ int bitbang_i2c_set(bitbang_i2c_interface *i2c, int line, int level) i2c->state = RECEIVING_BIT7; if (data != 0) { DPRINTF("NACKED\n"); + i2c->state = SENT_NACK; i2c_nack(i2c->bus); } else { DPRINTF("ACKED\n"); |