salfter/vgaedidinjector
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This commit is contained in:
Wolfgang Draxinger
2013-12-22 19:07:27 +01:00
parent 217ddb1e32
commit e9b41c8d6b
3 changed files with 68 additions and 58 deletions
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106
edid_injector.c
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@@ -32,21 +32,38 @@
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*****************************************************************************/
#include "avr_compiler.h"
#include "twi_master_driver.h"
#include "twi_slave_driver.h"
#include <string.h>
#include "eeprom_driver.h"
/*! AUDRATE 100kHz and Baudrate Register Settings */
#include "twi_master_driver.h"
#include "twi_slave_driver.h"
/*! BAUDRATE 100kHz and Baudrate Register Settings */
#define BAUDRATE 100000
#define TWI_BAUDSETTING TWI_BAUD(F_CPU, BAUDRATE)
#define EDID_SLAVE_ADDRESS 0xA0
/* TWIC is on the display side */
TWI_t * const twiDisplay = &TWIC;
TWI_Master_t twimDisplay; /*!< TWI master module. Used for talking with display */
/*! TWIC Master Interrupt vector. */
ISR(TWIC_TWIM_vect)
{
TWI_MasterInterruptHandler(&twimDisplay);
}
/* TWIE is on the host side */
TWI_t * const twiHost = &TWIE;
TWI_Slave_t twimHost; /*!< TWI slave module. Used for talking with host */
TWI_Slave_t twisHost; /*!< TWI slave module. Used for talking with host */
/*! TWIC Slave Interrupt vector. */
ISR(TWIE_TWIS_vect)
{
TWI_SlaveInterruptHandler(&twisHost);
}
void TWIC_SlaveProcessData(void)
@@ -55,17 +72,56 @@ void TWIC_SlaveProcessData(void)
void edid_initHostTWI(void)
{
/* Initialize TWI slave. */
TWI_SlaveInitializeDriver(&twisHost, twiHost, TWIC_SlaveProcessData);
TWI_SlaveInitializeModule(&twisHost,
EDID_SLAVE_ADDRESS,
TWI_SLAVE_INTLVL_MED_gc );
}
void edid_initDisplayTWI(void)
{
/* Initialize TWI master. */
TWI_MasterInit(&twimDisplay,
twiDisplay,
TWI_MASTER_INTLVL_LO_gc,
TWI_BAUDSETTING);
/* Enable internal pull-up on PC0, PC1. */
/* If you don't have external pullups enable this */
#if 0
/* Configure several PINxCTRL registers at the same time */
PORTCFG.MPCMASK = 0x03;
/* Enable pull-up to get a defined level on the switches */
PORTC.PIN0CTRL = (PORTC.PIN0CTRL & ~PORT_OPC_gm) | PORT_OPC_PULLUP_gc;
#endif
}
uint8_t edid_genChecksum(uint8_t *ediddata)
{
uint8_t bytessum = 0;
for(size_t i = 0; i < 127; i++) {
bytessum += ediddata[i];
}
return 0xff - bytessum;
}
void edid_readFromDisplayToEEPROM(void)
{
uint8_t buffer[128];
memset(buffer, 0, sizeof(buffer);
uint8_t displayedid[128];
memset(displayedid, 0, sizeof(displayedid));
/* read 128 EDID bytes from display */
/* set EDID Extension Block count / flags to zero */
/* recalculate checksum */
displayedid[127] = edid_genChecksum(displayedid);
/* write EDID information to EEPROM */
}
int main(void)
@@ -74,34 +130,7 @@ int main(void)
edid_initDisplayTWI();
/* Initialize PORTE for output and PORTD for inverted input. */
PORTE.DIRSET = 0xFF;
PORTD.DIRCLR = 0xFF;
PORTCFG.MPCMASK = 0xFF;
PORTD.PIN0CTRL |= PORT_INVEN_bm;
// PORTCFG.MPCMASK = 0xFF;
// PORTD.PIN0CTRL = (PORTD.PIN0CTRL & ~PORT_OPC_gm) | PORT_OPC_PULLUP_gc;
// Enable internal pull-up on PC0, PC1.. Uncomment if you don't have external pullups
// PORTCFG.MPCMASK = 0x03; // Configure several PINxCTRL registers at the same time
// PORTC.PIN0CTRL = (PORTC.PIN0CTRL & ~PORT_OPC_gm) | PORT_OPC_PULLUP_gc; //Enable pull-up to get a defined level on the switches
/* Initialize TWI master. */
TWI_MasterInit(&twiMaster,
&TWIC,
TWI_MASTER_INTLVL_LO_gc,
TWI_BAUDSETTING);
/* Initialize TWI slave. */
TWI_SlaveInitializeDriver(&twiSlave, &TWIC, TWIC_SlaveProcessData);
TWI_SlaveInitializeModule(&twiSlave,
SLAVE_ADDRESS,
TWI_SLAVE_INTLVL_LO_gc);
/* Enable LO interrupt level. */
PMIC.CTRL |= PMIC_LOLVLEN_bm;
sei();
@@ -119,14 +148,3 @@ int main(void)
#endif
}
/*! TWIC Master Interrupt vector. */
ISR(TWIC_TWIM_vect)
{
TWI_MasterInterruptHandler(&twiMaster);
}
/*! TWIC Slave Interrupt vector. */
ISR(TWIC_TWIS_vect)
{
TWI_SlaveInterruptHandler(&twiSlave);
}