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Code Issues Wiki Activity

MAX7456: Detect video standard dynamically

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This commit is contained in:
jflyper 2016-11-23 21:14:29 +09:00
parent 2c4e399ca1
commit 457afbcaf0
1 changed files with 93 additions and 19 deletions
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112
src/main/drivers/max7456.c
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@ -37,9 +37,8 @@
#include "max7456.h"
#include "max7456_symbols.h"
//MAX7456 opcodes
//XXX These are not opcodes but reg addrs. Substitute with MAX7456ADD_xxx.
#define DMM_REG 0x04
#define DMAH_REG 0x05
#define DMAL_REG 0x06
@ -52,15 +51,21 @@
#define MAX7456_RESET 0x02
#define VERTICAL_SYNC_NEXT_VSYNC 0x04
#define OSD_ENABLE 0x08
#define SYNC_MODE_AUTO 0x00
#define SYNC_MODE_INTERNAL 0x30
#define SYNC_MODE_EXTERNAL 0x20
#define VIDEO_MODE_PAL 0x40
#define VIDEO_MODE_NTSC 0x00
#define VIDEO_MODE_MASK 0x40
#define VIDEO_MODE_IS_PAL(val) (((val) & VIDEO_MODE_MASK) == VIDEO_MODE_PAL)
#define VIDEO_MODE_IS_NTSC(val) (((val) & VIDEO_MODE_MASK) == VIDEO_MODE_NTSC)
#define VIDEO_SIGNAL_DEBOUNCE_MS 100 // Time to wait for input to stabilize
// video mode register 1 bits
// duty cycle is on_off
#define BLINK_DUTY_CYCLE_50_50 0x00
#define BLINK_DUTY_CYCLE_33_66 0x01
@ -85,9 +90,33 @@
#define BACKGROUND_MODE_GRAY 0x40
//MAX7456 commands
// STAT register bits
#define STAT_PAL 0x01
#define STAT_NTSC 0x02
#define STAT_LOS 0x04
#define STAT_NVR_BUSY 0x20
#define STAT_IS_PAL(val) ((val) & STAT_PAL)
#define STAT_IS_NTSC(val) ((val) & STAT_NTSC)
#define STAT_IS_LOS(val) ((val) & STAT_LOS)
#define VIN_IS_PAL(val) (!STAT_IS_LOS(val) && STAT_IS_PAL(val))
#define VIN_IS_NTSC(val) (!STAT_IS_LOS(val) && STAT_IS_NTSC(val))
// Kluege warning!
// There are occasions that NTSC is not detected even with !LOS (AB7456 specific?)
// When this happens, lower 3 bits of STAT register is read as zero.
// To cope with this case, this macro defines !LOS && !PAL as NTSC.
// Should be compatible with MAX7456 and non-problematic case.
#define VIN_IS_NTSC_alt(val) (!STAT_IS_LOS(val) && !STAT_IS_PAL(val))
// DMM special bits
#define CLEAR_DISPLAY 0x04
#define CLEAR_DISPLAY_VERT 0x06
// Special address for terminating incremental write
#define END_STRING 0xff
@ -125,7 +154,6 @@
#define NVM_RAM_SIZE 54
#define WRITE_NVR 0xA0
#define STATUS_REG_NVR_BUSY 0x20
/** Line multiples, for convenience & one less op at runtime **/
#define LINE 30
@ -147,12 +175,6 @@
#define LINE16 450
//on shared SPI buss we want to change clock for OSD chip and restore for other devices
#ifdef MAX7456_SPI_CLK
#define ENABLE_MAX7456 {spiSetDivisor(MAX7456_SPI_INSTANCE, MAX7456_SPI_CLK);IOLo(max7456CsPin);}
@ -315,8 +337,12 @@ uint8_t max7456GetRowsCount(void)
return (videoSignalReg & VIDEO_MODE_PAL) ? VIDEO_LINES_PAL : VIDEO_LINES_NTSC;
}
#if 0
// XXX Remove this comment, too.
//because MAX7456 need some time to detect video system etc. we need to wait for a while to initialize it at startup
//and in case of restart we need to reinitialize chip
#endif
void max7456ReInit(void)
{
uint8_t maxScreenRows;
@ -324,9 +350,13 @@ void max7456ReInit(void)
uint16_t x;
static bool firstInit = true;
#if 0
// XXX We don't have to wait for the cam any more.
// XXX Remove this when everything is stable.
//do not init MAX before camera power up correctly
if (millis() < 1500)
return;
#endif
ENABLE_MAX7456;
@ -334,15 +364,22 @@ void max7456ReInit(void)
case VIDEO_SYSTEM_PAL:
videoSignalReg = VIDEO_MODE_PAL | OSD_ENABLE;
break;
case VIDEO_SYSTEM_NTSC:
videoSignalReg = VIDEO_MODE_NTSC | OSD_ENABLE;
break;
case VIDEO_SYSTEM_AUTO:
srdata = max7456Send(MAX7456ADD_STAT, 0x00);
if ((0x02 & srdata) == 0x02)
if (VIN_IS_NTSC(srdata)) {
videoSignalReg = VIDEO_MODE_NTSC | OSD_ENABLE;
else
} else if (VIN_IS_PAL(srdata)) {
videoSignalReg = VIDEO_MODE_PAL | OSD_ENABLE;
} else {
// No valid input signal, fallback to default (XXX NTSC for now)
videoSignalReg = VIDEO_MODE_NTSC | OSD_ENABLE;
}
break;
}
@ -436,22 +473,60 @@ bool max7456DmaInProgres(void)
}
#endif
#include "build/debug.h"
void max7456DrawScreen(void)
{
uint8_t check;
uint8_t stallCheck;
uint8_t videoSense;
static uint32_t videoDetectTimeMs = 0;
static uint16_t pos = 0;
int k = 0, buff_len=0;
if (!max7456Lock && !fontIsLoading) {
//-----------------detect MAX7456 fail, or initialize it at startup when it is ready--------
// Detect MAX7456 fail, or initialize it at startup when it is ready
max7456Lock = true;
ENABLE_MAX7456;
check = max7456Send(VM0_REG | 0x80, 0x00);
stallCheck = max7456Send(VM0_REG | 0x80, 0x00);
DISABLE_MAX7456;
if ( check != videoSignalReg)
if (stallCheck != videoSignalReg) {
max7456ReInit();
} else if (videoSignalCfg == VIDEO_SYSTEM_AUTO) {
// Adjust output format based on the current input format.
ENABLE_MAX7456;
videoSense = max7456Send(MAX7456ADD_STAT, 0x00);
DISABLE_MAX7456;
debug[0] = videoSignalReg & VIDEO_MODE_MASK;
debug[1] = videoSense & 0x7;
debug[3] = max7456GetRowsCount();
if (videoSense & STAT_LOS) {
videoDetectTimeMs = 0;
} else {
// There is a case that NTSC is not detected for some reason (AB7456 specific?)
// Here we force NTSC detection if not LOS and not PAL.
if ((VIN_IS_PAL(videoSense) && VIDEO_MODE_IS_NTSC(videoSignalReg))
|| (VIN_IS_NTSC_alt(videoSense) && VIDEO_MODE_IS_PAL(videoSignalReg))) {
if (videoDetectTimeMs) {
if (millis() - videoDetectTimeMs > VIDEO_SIGNAL_DEBOUNCE_MS) {
max7456ReInit();
debug[2]++;
}
} else {
// Wait for signal to stabilize
videoDetectTimeMs = millis();
}
}
}
}
//------------ end of (re)init-------------------------------------
for (k=0; k< MAX_CHARS2UPDATE; k++) {
@ -545,12 +620,11 @@ void max7456WriteNvm(uint8_t char_address, const uint8_t *font_data)
max7456Send(MAX7456ADD_CMM, WRITE_NVR);
// wait until bit 5 in the status register returns to 0 (12ms)
while ((max7456Send(MAX7456ADD_STAT, 0x00) & STATUS_REG_NVR_BUSY) != 0x00);
while ((max7456Send(MAX7456ADD_STAT, 0x00) & STAT_NVR_BUSY) != 0x00);
DISABLE_MAX7456;
max7456Lock = false;
}
#endif