christian b
Mbed 4dGenie class
Dependents: Genie_Test 039847382-S3_DS1621_and_LCD_V1
This is a work in progress.
4dGenie class to use with 4dLCD screens that are using the genie environment.
There are still some rare occasions where the 4dLCD might crash, for now i have no solution to this except doing a reset of the 4dLCD.
Please make sure to have the most up to date PmmC loaded on the screen.
usage example :
Mbed4dGenie test program
#include "mbed.h"
#include "mbed_genie.h"
DigitalOut myled(LED1);
/*
The Mbed4dGenie class requires 3 parameters
1 - Tx pin
2 - Rx pin
3 - Reset pin
*/
Mbed4dGenie lcd4d(PTE0,PTE1,PTB9);
int main() {
int temp = 0;
printf("Mbed Genie demo \n\r");
lcd4d.Start();
/*
for example, in this loop we increment the thermometer0 object from 0 to 100
*/
while(1) {
if(temp >= 100)
{
temp = -1;
}
else
{
temp++;
}
lcd4d.genieWriteObject(GENIE_OBJ_LED_DIGITS,1,temp);
myled = 1;
wait(0.05);
myled = 0;
wait(0.05);
}
}
Diff: mbed_genie.cpp
- Revision:
- 11:9196f72fc325
- Parent:
- 10:4d9f1be4a901
--- a/mbed_genie.cpp Tue Jul 08 18:34:47 2014 +0000
+++ b/mbed_genie.cpp Wed Mar 04 03:00:40 2015 +0000
@@ -9,17 +9,27 @@
_genieUserHandler = NULL;
RxStateTimeoutErrors = 0;
}
+Mbed4dGenie::Mbed4dGenie(PinName TxPin,PinName RxPin, PinName resetpin,uint32_t baud) : _screen(TxPin,RxPin) , _reset(resetpin)
+{
+ //reset the 4d screen
+ _reset = 0;
+ _screen.baud(baud);
+ _genieUserHandler = NULL;
+ RxStateTimeoutErrors = 0;
+}
void Mbed4dGenie::Start()
{
_reset = 1;
wait(3.0); //4D datasheet says that the screen can take up to 3000 ms before
//becomming responsive to serial commands.
- _t.start();
+ _waitTimer.start();
+ _receptionTimer.start();
Reset();
_genieFlushEventQueue();
_screen.attach(this,&Mbed4dGenie::RxIrqHandler,Serial::RxIrq);
}
+
////////////////////// genieGetEventData ////////////////////////
//
// Returns the LSB and MSB of the event's data combined into
@@ -40,8 +50,15 @@
do
{
c = _screen.getc();
- if(_t.read_ms() >= RxMaxTimeout && state == CommInProgress)
+ /*
+ check if we are in reception mode and if we timeout
+ */
+ if(_receptionTimer.read_ms() >= RxMaxTimeout && state == CommInProgress)
{
+ /*
+ if we get here, it means something bad has happened and
+ we need to reet communication status
+ */
Reset();
}
ManageReceiveData(c);
@@ -61,7 +78,9 @@
}
else if(data == GENIE_REPORT_OBJ || data == GENIE_REPORT_EVENT)
{
- RxMaxTimeout = _t.read_ms() + RESYNC_PERIOD;
+ //re-initialise the reception timer
+ _receptionTimer.reset();
+ RxMaxTimeout = _receptionTimer.read_ms() + RESYNC_PERIOD;
checksum = data;
rx_data[rxframe_count++] = data;
state = CommInProgress;
@@ -175,18 +194,22 @@
}
bool Mbed4dGenie::WaitForIdle()
{
+ /*
+ If the communication is still in progress
+ lets wait for it to finish or check/wait for timeout
+ */
if(state != CommIdle)
{
- long timeout = _t.read_ms() + TIMEOUT_PERIOD;
+ long timeout = _receptionTimer.read_ms() + TIMEOUT_PERIOD;
long timerReading = 0;
- if(_t.read_ms() >= RxMaxTimeout)
+ if(_receptionTimer.read_ms() >= RxMaxTimeout)
{
Reset();
RxStateTimeoutErrors++;
}
while(timerReading < timeout && state != CommIdle)
{
- timerReading = _t.read_ms();
+ timerReading = _receptionTimer.read_ms();
}
LastResponse = 0;
return (timerReading >= timeout);
@@ -195,20 +218,26 @@
return false;
}
+/*
+ Not used for now, since the screen will answer with either a report event or NAK
+ Since those two answers are so different, there is no efficient means to receive
+ both in interrupt. No wait to NAK will be done. DONT USE THIS FUNCTION ... YET
+*/
int8_t Mbed4dGenie::WaitForReadAnswer()
{
- long timeout = _t.read_ms() + TIMEOUT_PERIOD;
+ _waitTimer.reset();
+ long timeout = _waitTimer.read_ms() + TIMEOUT_PERIOD;
long timerReading = 0;
while(state == CommIdle && LastResponse != ERROR_NAK && timerReading < timeout)
{
- timerReading = _t.read_ms();
+ timerReading = _waitTimer.read_ms();
}
if(LastResponse == ERROR_NAK)//check if the screen returned a NACK
{
LastResponse = NO_RESPONSE;
return ERROR_NAK;
}
- else if(_t.read_ms() >= timeout) //check if we timed out while waiting for response
+ else if(_waitTimer.read_ms() >= timeout) //check if we timed out while waiting for response
{
LastResponse = NO_RESPONSE;
@@ -221,12 +250,12 @@
int8_t Mbed4dGenie::WaitForAnswer()
{
-
- long timeout = _t.read_ms() + TIMEOUT_PERIOD;
+ _waitTimer.reset();
+ long timeout = _waitTimer.read_ms() + TIMEOUT_PERIOD;
long timerReading = 0;
while(LastResponse != GENIE_ACK && LastResponse != ERROR_NAK && timerReading < timeout)
{
- timerReading = _t.read_ms();
+ timerReading = _waitTimer.read_ms();
}
if(LastResponse == ERROR_NAK)
@@ -234,9 +263,9 @@
LastResponse = NO_RESPONSE;
return ERROR_NAK;
}
- else if(_t.read_ms() >= timeout)
+ else if(_waitTimer.read_ms() >= timeout)
{
- printf("Current timer:%d ; timeout:%d\n\r",_t.read_ms(),timeout);
+ printf("Current timer:%d ; timeout:%d\n\r",_waitTimer.read_ms(),timeout);
LastResponse = NO_RESPONSE;
return ERROR_TIMEOUT;
}
@@ -248,6 +277,8 @@
{
LastResponse = NO_RESPONSE;
state = CommIdle;
+ _receptionTimer.reset();
+ _waitTimer.reset();
while(_screen.readable())
_screen.getc();
}