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Add inversion and brightness support to MAX7456 driver

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This commit is contained in:
Dan Nixon 2017-05-24 12:57:23 +01:00
parent 028b8372d2
commit 28fcfcd34e
2 changed files with 39 additions and 3 deletions
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40
src/main/drivers/max7456.c
View file

@ -107,6 +107,7 @@
// DMM special bits // DMM special bits
#define CLEAR_DISPLAY 0x04 #define CLEAR_DISPLAY 0x04
#define CLEAR_DISPLAY_VERT 0x06 #define CLEAR_DISPLAY_VERT 0x06
#define INVERT_PIXEL_COLOR 0x08
// Special address for terminating incremental write // Special address for terminating incremental write
#define END_STRING 0xff #define END_STRING 0xff
@ -183,6 +184,7 @@ static uint8_t spiBuff[MAX_CHARS2UPDATE*6];
static uint8_t videoSignalCfg; static uint8_t videoSignalCfg;
static uint8_t videoSignalReg = OSD_ENABLE; // OSD_ENABLE required to trigger first ReInit static uint8_t videoSignalReg = OSD_ENABLE; // OSD_ENABLE required to trigger first ReInit
static uint8_t displayMemoryModeReg = 0;
static uint8_t hosRegValue; // HOS (Horizontal offset register) value static uint8_t hosRegValue; // HOS (Horizontal offset register) value
static uint8_t vosRegValue; // VOS (Vertical offset register) value static uint8_t vosRegValue; // VOS (Vertical offset register) value
@ -370,7 +372,7 @@ void max7456ReInit(void)
max7456Send(MAX7456ADD_HOS, hosRegValue); max7456Send(MAX7456ADD_HOS, hosRegValue);
max7456Send(MAX7456ADD_VOS, vosRegValue); max7456Send(MAX7456ADD_VOS, vosRegValue);
max7456Send(MAX7456ADD_DMM, CLEAR_DISPLAY); max7456Send(MAX7456ADD_DMM, displayMemoryModeReg | CLEAR_DISPLAY);
DISABLE_MAX7456; DISABLE_MAX7456;
// Clear shadow to force redraw all screen in non-dma mode. // Clear shadow to force redraw all screen in non-dma mode.
@ -414,6 +416,38 @@ void max7456Init(const vcdProfile_t *pVcdProfile)
// Real init will be made later when driver detect idle. // Real init will be made later when driver detect idle.
} }
/**
* Sets inversion of black and white pixels.
*/
void max7456Invert(bool invert)
{
if (invert)
displayMemoryModeReg |= INVERT_PIXEL_COLOR;
else
displayMemoryModeReg &= ~INVERT_PIXEL_COLOR;
ENABLE_MAX7456;
max7456Send(MAX7456ADD_DMM, displayMemoryModeReg);
DISABLE_MAX7456;
}
/**
* Sets the brighness of black and white pixels.
*
* @param black Black brightness (0-3, 0 is darkest)
* @param white White brightness (0-3, 0 is brightest)
*/
void max7456Brightness(uint8_t black, uint8_t white)
{
uint8_t reg = (black << 2) | white;
ENABLE_MAX7456;
for (int i = MAX7456ADD_RB0; i <= MAX7456ADD_RB15; i++) {
max7456Send(i, reg);
}
DISABLE_MAX7456;
}
//just fill with spaces with some tricks //just fill with spaces with some tricks
void max7456ClearScreen(void) void max7456ClearScreen(void)
{ {
@ -560,7 +594,7 @@ void max7456RefreshAll(void)
ENABLE_MAX7456; ENABLE_MAX7456;
max7456Send(MAX7456ADD_DMAH, 0); max7456Send(MAX7456ADD_DMAH, 0);
max7456Send(MAX7456ADD_DMAL, 0); max7456Send(MAX7456ADD_DMAL, 0);
max7456Send(MAX7456ADD_DMM, 1); max7456Send(MAX7456ADD_DMM, displayMemoryModeReg | 1);
for (xx = 0; xx < maxScreenSize; ++xx) for (xx = 0; xx < maxScreenSize; ++xx)
{ {
@ -569,7 +603,7 @@ void max7456RefreshAll(void)
} }
max7456Send(MAX7456ADD_DMDI, 0xFF); max7456Send(MAX7456ADD_DMDI, 0xFF);
max7456Send(MAX7456ADD_DMM, 0); max7456Send(MAX7456ADD_DMM, displayMemoryModeReg);
DISABLE_MAX7456; DISABLE_MAX7456;
max7456Lock = false; max7456Lock = false;
} }

2
src/main/drivers/max7456.h
View file

@ -37,6 +37,8 @@ extern uint16_t maxScreenSize;
struct vcdProfile_s; struct vcdProfile_s;
void max7456HardwareReset(void); void max7456HardwareReset(void);
void max7456Init(const struct vcdProfile_s *vcdProfile); void max7456Init(const struct vcdProfile_s *vcdProfile);
void max7456Invert(bool invert);
void max7456Brightness(uint8_t black, uint8_t white);
void max7456DrawScreen(void); void max7456DrawScreen(void);
void max7456WriteNvm(uint8_t char_address, const uint8_t *font_data); void max7456WriteNvm(uint8_t char_address, const uint8_t *font_data);
uint8_t max7456GetRowsCount(void); uint8_t max7456GetRowsCount(void);