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hwstub: implement i2c and i2c eeprom dump

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Change-Id: Iff1b4f40affb88c104e7322e25cdbe34f8886476
This commit is contained in:
Amaury Pouly 2013-12-06 01:56:04 +01:00
parent c945fb6e94
commit 58bb4b9b4c
2 changed files with 72 additions and 1 deletions
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34
utils/hwstub/tools/lua/stmp/i2c.lua
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@ -73,4 +73,38 @@ function STMP.i2c.transmit(slave_addr, buffer, send_stop)
else
return true
end
end
function STMP.i2c.receive(slave_addr, length)
if length > 4 then
error("PIO mode cannot receive mode than 4 bytes at once")
end
-- send address
HW.I2C.CTRL0.RETAIN_CLOCK.set()
STMP.i2c.transmit(bit32.bor(slave_addr, 1), {}, false, true)
HW.I2C.CTRL0.DIRECTION.clr()
HW.I2C.CTRL0.XFER_COUNT.write(length)
HW.I2C.CTRL0.SEND_NAK_ON_LAST.set()
HW.I2C.CTRL0.POST_SEND_STOP.set()
HW.I2C.CTRL0.RETAIN_CLOCK.clr()
HW.I2C.CTRL0.RUN.set()
while HW.I2C.CTRL0.RUN.read() == 1 do
end
if HW.I2C.CTRL1.NO_SLAVE_ACK_IRQ.read() == 1 then
if STMP.is_imx233() then
HW.I2C.CTRL1.CLR_GOT_A_NAK.set()
end
STMP.i2c.reset()
return nil
end
if HW.I2C.CTRL1.EARLY_TERM_IRQ.read() == 1 or HW.I2C.CTRL1.MASTER_LOSS_IRQ.read() == 1 then
return nil
else
local data = HW.I2C.DATA.read()
local res = {}
for i = 0, length - 1 do
table.insert(res, bit32.band(0xff, bit32.rshift(data, 8 * i)))
end
return res
end
end