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Add finger present API and bit. Update README 

Signed-off-by: Joachim Strömbergson <joachim@assured.se>
This commit is contained in:
Joachim Strömbergson 2024-04-22 15:35:31 +02:00 committed by Michael Cardell Widerkrantz
parent f655196af7
commit 32837fe031
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2 changed files with 29 additions and 10 deletions
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23
hw/application_fpga/core/touch_sense/README.md
View File

@ -16,14 +16,27 @@ before being able to detect another event.
## API
The API has a single address, and a single bit in that address:
The API has two addresses.
```
ADDR_STATUS: 0x09
STATUS_EVENT_BIT: 0
ADDR_PRESENT: 0x0a
FINGER_PRESENT_BIT: 0
```
SW should clear any stray attempts before signalling to the user that
a touch event is expected. Clearing an event is done by writing the
the status address, the value written does not matter.
In order to detect an event, SW should clear any stray attempts before
signalling to the user that a touch event is expected. Clearing an
event is done by writing the the status address, the value written
does not matter.
When an event has been detected, that is the sampled input from the
sensor has gone from low to high, the STATUS_EVENT_BIT will be high
(set). When SW reads a high bit, the SW should as soon as possible
clear the event by writing to the status register. The value written
does not matter.
The FINGER_PRESENT bit is the sampled input from the sensor. The bit
will be high as long as a finger is present on the sensor. When a
finger is present the bit will be low.

16
hw/application_fpga/core/touch_sense/rtl/touch_sense.v
View File

@ -31,12 +31,14 @@ module touch_sense(
//----------------------------------------------------------------
// Internal constant and parameter definitions.
//----------------------------------------------------------------
localparam ADDR_STATUS = 8'h09;
localparam STATUS_EVENT_BIT = 0;
localparam ADDR_STATUS = 8'h09;
localparam STATUS_EVENT_BIT = 0;
localparam ADDR_PRESENT = 8'h0a;
localparam FINGER_PRESENT_BIT = 0;
localparam CTRL_IDLE = 2'h0;
localparam CTRL_EVENT = 2'h1;
localparam CTRL_WAIT = 2'h2;
localparam CTRL_IDLE = 2'h0;
localparam CTRL_EVENT = 2'h1;
localparam CTRL_WAIT = 2'h2;
//----------------------------------------------------------------
@ -120,6 +122,10 @@ module touch_sense(
if (address == ADDR_STATUS) begin
tmp_read_data[STATUS_EVENT_BIT] = touch_event_reg;
end
if (address == ADDR_PRESENT) begin
tmp_read_data[FINGER_PRESENT_BIT] = touch_event_sample1_reg;
end
end
end
end // api