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Merged
merged 4 commits into from
Jun 22, 2022
Merged

board/teensy40: Add I2C support #1471

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21d6181
teensy40: add I2C support
ardnew Oct 28, 2020
095a62e
teensy40: cleanup misc items per review comments
ardnew Nov 13, 2020
4d64ee6
use reference variables for each I2C instance
ardnew Sep 11, 2021
f171d9e
address remaining review comments
ardnew Jun 21, 2022
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46 changes: 46 additions & 0 deletions src/machine/board_teensy40.go
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Original file line number Diff line number Diff line change
Expand Up @@ -346,3 +346,49 @@ const (
I2C3_SDA_PIN = D25
I2C3_SCL_PIN = D24
)

var (
I2C0 = I2C1 // I2C0 is an alias for I2C1 (LPI2C1)
I2C1 = &_I2C1
_I2C1 = I2C{
Bus: nxp.LPI2C1,
sda: I2C1_SDA_PIN, // D18 (PA17 [AD_B1_01])
scl: I2C1_SCL_PIN, // D19 (PA16 [AD_B1_00])
muxSDA: muxSelect{
mux: nxp.IOMUXC_LPI2C1_SDA_SELECT_INPUT_DAISY_GPIO_AD_B1_01_ALT3,
sel: &nxp.IOMUXC.LPI2C1_SDA_SELECT_INPUT,
},
muxSCL: muxSelect{
mux: nxp.IOMUXC_LPI2C1_SCL_SELECT_INPUT_DAISY_GPIO_AD_B1_00_ALT3,
sel: &nxp.IOMUXC.LPI2C1_SCL_SELECT_INPUT,
},
}
I2C2 = &_I2C2
_I2C2 = I2C{
Bus: nxp.LPI2C3,
sda: I2C2_SDA_PIN, // D17 (PA22 [AD_B1_06])
scl: I2C2_SCL_PIN, // D16 (PA23 [AD_B1_07])
muxSDA: muxSelect{
mux: nxp.IOMUXC_LPI2C3_SDA_SELECT_INPUT_DAISY_GPIO_AD_B1_06_ALT1,
sel: &nxp.IOMUXC.LPI2C3_SDA_SELECT_INPUT,
},
muxSCL: muxSelect{
mux: nxp.IOMUXC_LPI2C3_SCL_SELECT_INPUT_DAISY_GPIO_AD_B1_07_ALT1,
sel: &nxp.IOMUXC.LPI2C3_SCL_SELECT_INPUT,
},
}
I2C3 = &_I2C3
_I2C3 = I2C{
Bus: nxp.LPI2C4,
sda: I2C3_SDA_PIN, // D25 (PA13 [AD_B0_13])
scl: I2C3_SCL_PIN, // D24 (PA12 [AD_B0_12])
muxSDA: muxSelect{
mux: nxp.IOMUXC_LPI2C4_SDA_SELECT_INPUT_DAISY_GPIO_AD_B0_13_ALT0,
sel: &nxp.IOMUXC.LPI2C4_SDA_SELECT_INPUT,
},
muxSCL: muxSelect{
mux: nxp.IOMUXC_LPI2C4_SCL_SELECT_INPUT_DAISY_GPIO_AD_B0_12_ALT0,
sel: &nxp.IOMUXC.LPI2C4_SCL_SELECT_INPUT,
},
}
)
8 changes: 4 additions & 4 deletions src/machine/machine_mimxrt1062.go
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Original file line number Diff line number Diff line change
Expand Up @@ -342,10 +342,10 @@ func (jt *pinJumpTable) dispatchInterrupt(interrupt.Interrupt) {
if status := gpio.ISR.Get() & gpio.IMR.Get(); status != 0 {
gpio.ISR.Set(status) // clear interrupt
for status != 0 {
p := Pin(bits.TrailingZeros32(status))
i := Pin(port + p)
jt.lut[i](i)
status &^= 1 << p
off := Pin(bits.TrailingZeros32(status)) // ctz
pin := Pin(port + off)
jt.lut[pin](pin)
status &^= 1 << off
}
}
}
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