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Lee Lup Yuen 2023-10-18 17:33:45 +08:00
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@ -7892,101 +7892,54 @@ JH7110 I2C is based on [DesignWare I2C](https://github.com/torvalds/linux/blob/m
See Page 252: "Figure 8-2: Flowchart for DW_apb_i2c Master"
```text
Write 0 to
IC_ENABLE to
disable
DW_apb_i2c
Write 0 to IC_ENABLE to disable DW_apb_i2c
Program IC_CON register fields as
required:
1. Set IC_SLAVE_DISABLE to 1 – Slave
disabled
2. Set IC_RESTART_EN to 1 – Enable
restart mode
3. Set IC_10BITADDR_MASTER to 0 –
7-bit addressing
4. Set IC_10BITADDR_SLAVE to 0 – 7-bit
addressing
5. Set IC_MAX_SPEED_MODE to 1 –
Standard mode
6. Set IC_MASTER_MODE to 1 – Master
enabled
Program IC_CON register fields as required:
1. Set IC_SLAVE_DISABLE to 1 – Slave disabled
2. Set IC_RESTART_EN to 1 – Enable restart mode
3. Set IC_10BITADDR_MASTER to 0 – 7-bit addressing
4. Set IC_10BITADDR_SLAVE to 0 – 7-bit addressing
5. Set IC_MAX_SPEED_MODE to 1 – Standard mode
6. Set IC_MASTER_MODE to 1 – Master enabled
Set address of
target Slave by
writing it to TAR
Set address of target Slave by writing it to TAR
Write to
IC_SS_HCNT to
set HIGH period
of SCL
Write to IC_SS_HCNT to set HIGH period of SCL
Write to
IC_SS_LCNT to
set LOW period
of SCL
Write to IC_SS_LCNT to set LOW period of SCL
Write to
IC_INTR_MASK to
enable all
interrupts
Write to IC_INTR_MASK to enable all interrupts
Write to
IC_RX_TL to
set Rx FIFO
threshold level
Write to IC_RX_TL to set Rx FIFO threshold level
Write to
IC_TX_TL to
set Tx FIFO
threshold level
Write to IC_TX_TL to set Tx FIFO threshold level
Write 1 to
IC_ENABLE to
enable
DW_apb_i2c
Write 1 to IC_ENABLE to enable DW_apb_i2c
Write to IC_DATA_CMD to
push Write command and write data
or Read command Tx FIFO
Write to IC_DATA_CMD to push Write command and write data or Read command Tx FIFO
Command is
Write?
Command is Write?
N:
RX_FULL
interrupt
asserted?
RX_FULL interrupt asserted?
Y:
Read
IC_DATA_CMD[7:0]
to retrieve
received byte
Read IC_DATA_CMD[7:0] to retrieve received byte
Y:
TX_EMPTY
interrupt
asserted?
TX_EMPTY interrupt asserted?
Y:
More
commands
to send?
More commands to send?
Y:
Write to IC_DATA_CMD...
N:
Is IC_STATUS[5]
(MST_ACTIVITY)
= 0?
Is IC_STATUS[5] (MST_ACTIVITY) = 0?
Y:
Write 0 to
IC_ENABLE to
disable
DW_apb_i2c
Write 0 to IC_ENABLE to disable DW_apb_i2c
```
Which is implemented by this NuttX Driver:
@ -7997,6 +7950,8 @@ Which is implemented by this NuttX Driver:
- Bit Bang Version: [cxd56_i2c_bitbang.c](https://github.com/apache/nuttx/blob/master/arch/arm/src/cxd56xx/cxd56_i2c_bitbang.c) and [cxd56_i2c_bitbang.h](https://github.com/apache/nuttx/blob/master/arch/arm/src/cxd56xx/cxd56_i2c_bitbang.h)
TODO: Test this with U-Boot
# PineTab-V Factory Test Code
The PineTab-V ships with [Factory Test Code](https://wiki.pine64.org/wiki/PineTab-V_Releases#Factory_releases).