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Fix a timing in ST7781 driver.

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All gpanel demos now work as expected.
This commit is contained in:
Serge Vakulenko
2015-10-11 13:08:18 -07:00
parent 2bb8bfabb3
commit 8d820f763f
4 changed files with 115 additions and 185 deletions
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175
sys/pic32/st7781.c
View File

@@ -45,13 +45,41 @@
*/
static int _col, _row;
/*
* ID of the LCD controller chip.
*/
static int _chip_id;
/*
* Delay for 100 nanoseconds.
* Needed to match the /WR and /RD timing requirements.
*/
#if CPU_KHZ <= 10000
# define delay100ns() /* empty */
#elif CPU_KHZ <= 20000
# define delay100ns() asm volatile("nop")
#elif CPU_KHZ <= 30000
# define delay100ns() asm volatile("nop; nop")
#elif CPU_KHZ <= 40000
# define delay100ns() asm volatile("nop; nop; nop")
#elif CPU_KHZ <= 50000
# define delay100ns() asm volatile("nop; nop; nop; nop")
#elif CPU_KHZ <= 60000
# define delay100ns() asm volatile("nop; nop; nop; nop; nop")
#elif CPU_KHZ <= 70000
# define delay100ns() asm volatile("nop; nop; nop; nop; nop; nop")
#else
# define delay100ns() asm volatile("nop; nop; nop; nop; nop; nop; nop; nop")
#endif
/*
* Signal mappings:
* /RESET - reset and initialize the chip.
* /CS - chip select when low.
* /RS - data or command selection.
* /RD - read operation enable.
* /WR - write operation enable.
* RS - command or data mode selection.
* D0-D7 - data bus, bidirectional.
*/
#define RST_IDLE() LAT_SET(LCD_RST_PORT) = 1<<LCD_RST_PIN
#define RST_ACTIVE() LAT_CLR(LCD_RST_PORT) = 1<<LCD_RST_PIN
@@ -59,27 +87,15 @@ static int _col, _row;
#define CS_IDLE() LAT_SET(LCD_CS_PORT) = 1<<LCD_CS_PIN
#define CS_ACTIVE() LAT_CLR(LCD_CS_PORT) = 1<<LCD_CS_PIN
#define RS_DATA() LAT_SET(LCD_RS_PORT) = 1<<LCD_CS_PIN
#define RS_COMMAND() LAT_CLR(LCD_RS_PORT) = 1<<LCD_CS_PIN
#define RD_IDLE() LAT_SET(LCD_RD_PORT) = 1<<LCD_RD_PIN
#define RD_ACTIVE() LAT_CLR(LCD_RD_PORT) = 1<<LCD_RD_PIN
#define WR_IDLE() LAT_SET(LCD_WR_PORT) = 1<<LCD_WR_PIN
#define WR_ACTIVE() LAT_CLR(LCD_WR_PORT) = 1<<LCD_WR_PIN
#define WR_STROBE() { WR_ACTIVE(); ndelay(50); WR_IDLE(); }
#define WR_STROBE() { WR_ACTIVE(); delay100ns(); WR_IDLE(); }
/*
* Delay for a given number of nanoseconds.
*/
void ndelay(unsigned nsec)
{
/* Four instructions (cycles) per loop. */
unsigned nloops = (nsec * (CPU_KHZ/1000)) / 1000 / 4;
while (nloops-- > 0)
asm volatile ("nop");
}
#define RS_DATA() LAT_SET(LCD_RS_PORT) = 1<<LCD_RS_PIN
#define RS_COMMAND() LAT_CLR(LCD_RS_PORT) = 1<<LCD_RS_PIN
/*
* Set direction of data bus as output.
@@ -164,7 +180,7 @@ static unsigned readByte()
unsigned value = 0;
RD_ACTIVE();
ndelay(100);
delay100ns();
if (PORT_VAL(LCD_D0_PORT) & (1 << LCD_D0_PIN)) value |= 1;
if (PORT_VAL(LCD_D1_PORT) & (1 << LCD_D1_PIN)) value |= 2;
if (PORT_VAL(LCD_D2_PORT) & (1 << LCD_D2_PIN)) value |= 4;
@@ -200,6 +216,7 @@ static unsigned readDeviceId()
CS_ACTIVE();
RS_COMMAND();
writeByte(0x00);
delay100ns();
WR_STROBE(); // Repeat prior byte (0x00)
setReadDir(); // Switch data bus as input
RS_DATA();
@@ -210,7 +227,11 @@ static unsigned readDeviceId()
return value;
}
static void initDisplay()
/*
* Detect the type of the LCD controller, and initialize it.
* Return -1 in case of unknown chip.
*/
static int initDisplay()
{
/*
* Set all control bits to high (idle).
@@ -231,17 +252,28 @@ static void initDisplay()
/* Reset the chip. */
RST_ACTIVE();
udelay(2000);
udelay(1000);
RST_IDLE();
udelay(1000);
/* Data transfer sync. */
CS_ACTIVE();
RS_COMMAND();
writeByte(0x00);
WR_STROBE(); // Three extra 0x00s
WR_STROBE();
WR_STROBE();
CS_IDLE();
/* Read the the chip ID register. */
_chip_id = readDeviceId();
switch (_chip_id) {
case 0x7783:
printf("swtft0: <Sitronix ST7781>\n");
break;
default:
/* Disable outputs. */
setReadDir();
TRIS_SET(LCD_CS_PORT) = 1 << LCD_CS_PIN;
TRIS_SET(LCD_RS_PORT) = 1 << LCD_RS_PIN;
TRIS_SET(LCD_WR_PORT) = 1 << LCD_WR_PIN;
TRIS_SET(LCD_RD_PORT) = 1 << LCD_RD_PIN;
TRIS_SET(LCD_RST_PORT) = 1 << LCD_RST_PIN;
printf("swtft0: Unknown chip ID = 0x%x\n", _chip_id);
return -1;
}
/* Initialization of LCD controller. */
CS_ACTIVE();
@@ -257,19 +289,15 @@ static void initDisplay()
writeReg(0x11, 0x0005);
writeReg(0x12, 0x0000);
writeReg(0x13, 0x0000);
//udelay(50000);
/* Power supply startup 1 settings. */
writeReg(0x10, 0x12B0);
//udelay(50000);
writeReg(0x11, 0x0007);
//udelay(50000);
/* Power supply startup 2 settings. */
writeReg(0x12, 0x008C);
writeReg(0x13, 0x1700);
writeReg(0x29, 0x0022);
//udelay(50000);
/* Gamma cluster settings. */
writeReg(0x30, 0x0000);
@@ -296,59 +324,7 @@ static void initDisplay()
/* Display on. */
writeReg(0x07, 0x0133);
#if 0
writeReg(0x01, 0x0100);
writeReg(0x02, 0x0700);
writeReg(0x03, 0x1030);
writeReg(0x08, 0x0302);
writeReg(0x09, 0x0000);
writeReg(0x0A, 0x0008);
/* Power control registers. */
writeReg(0x10, 0x0790);
writeReg(0x11, 0x0005);
writeReg(0x12, 0x0000);
writeReg(0x13, 0x0000);
//udelay(50000);
/* Power supply startup 1 settings. */
writeReg(0x10, 0x12B0);
//udelay(50000);
writeReg(0x11, 0x0007);
//udelay(50000);
/* Power supply startup 2 settings. */
writeReg(0x12, 0x008C);
writeReg(0x13, 0x1700);
writeReg(0x29, 0x0022);
//udelay(50000);
/* Gamma cluster settings. */
writeReg(0x30, 0x0000);
writeReg(0x31, 0x0505);
writeReg(0x32, 0x0205);
writeReg(0x35, 0x0206);
writeReg(0x36, 0x0408);
writeReg(0x37, 0x0000);
writeReg(0x38, 0x0504);
writeReg(0x39, 0x0206);
writeReg(0x3C, 0x0206);
writeReg(0x3D, 0x0408);
/* Display window 240*320. */
writeReg(0x50, 0x0000);
writeReg(0x51, 0x00EF);
writeReg(0x52, 0x0000);
writeReg(0x53, 0x013F);
/* Frame rate settings. */
writeReg(0x60, 0xA700);
writeReg(0x61, 0x0001);
writeReg(0x90, 0x0033); // RTNI setting
/* Display on. */
writeReg(0x07, 0x0133);
#endif
return 0;
}
static void setAddrWindow(int x0, int y0, int x1, int y1)
@@ -374,9 +350,9 @@ static void setPixel(int x, int y, int color)
if (x < 0 || x >= WIDTH || y < 0 || y >= HEIGHT)
return;
CS_ACTIVE();
writeReg(0x0020, x);
writeReg(0x0021, y);
writeReg(0x0022, color);
writeReg(0x20, x);
writeReg(0x21, y);
writeReg(0x22, color);
CS_IDLE();
}
@@ -412,14 +388,20 @@ static void flood(int color, int npixels)
/* 64 pixels/block / 4 pixels/pass. */
for (i = 16; i > 0; i--) {
/* 2 bytes/pixel x 4 pixels. */
WR_STROBE(); WR_STROBE(); WR_STROBE(); WR_STROBE();
WR_STROBE(); WR_STROBE(); WR_STROBE(); WR_STROBE();
delay100ns(); WR_STROBE();
delay100ns(); WR_STROBE();
delay100ns(); WR_STROBE();
delay100ns(); WR_STROBE();
delay100ns(); WR_STROBE();
delay100ns(); WR_STROBE();
delay100ns(); WR_STROBE();
delay100ns(); WR_STROBE();
}
}
/* Fill any remaining pixels (1 to 64). */
for (i = npixels & 63; i > 0; i--) {
WR_STROBE();
WR_STROBE();
delay100ns(); WR_STROBE();
delay100ns(); WR_STROBE();
}
} else {
while (blocks--) {
@@ -760,8 +742,8 @@ int gpanel_ioctl(dev_t dev, register u_int cmd, caddr_t addr, int flag)
struct gpanel_clear_t *param = (struct gpanel_clear_t*) addr;
CS_ACTIVE();
writeReg(0x0020, 0);
writeReg(0x0021, 0);
writeReg(0x20, 0);
writeReg(0x21, 0);
flood(param->color, WIDTH * HEIGHT);
param->xsize = WIDTH;
param->ysize = HEIGHT;
@@ -863,13 +845,10 @@ static int
swtftprobe(config)
struct conf_device *config;
{
unsigned id;
if (initDisplay() < 0)
return 0;
initDisplay();
printf("swtft0: display %ux%u\n", HEIGHT, WIDTH);
id = readDeviceId();
if (id == 0x7783)
printf("swtft0: Sitronix ST7781 TFT controller\n");
setAddrWindow(0, 0, WIDTH-1, HEIGHT-1);
return 1;
}

20
sys/pic32/wf32/Config
View File

@@ -49,14 +49,14 @@ options "SD_MHZ=10" # speed 10 MHz
# RG6, RG7, RG8, RD4 - spi2, SD card
# RA14, RB0, RB2, RB4,
# RB8, RB10, RD0, RD1,
# RD2, RD3, RE8, RE9, RF0 - LCD display
# RD2, RD3, RE8, RE9, RF1 - LCD display
#
device gpio0 flags 0x86ff # port A
device gpio1 flags 0xfaea # port B
device gpio2 flags 0xf01e # port C
device gpio3 flags 0xffe0 # port D
device gpio4 flags 0x00ff # port E
device gpio5 flags 0x303a # port F
device gpio5 flags 0x3039 # port F
device gpio6 flags 0xf20f # port G
# ADC driver
@@ -64,3 +64,19 @@ device adc
# PWM driver
device pwm
# ST7781 TFT display driver
device swtft
signal "LCD_RST" pin RB10
signal "LCD_CS" pin RB0
signal "LCD_RD" pin RB2
signal "LCD_RS" pin RB8
signal "LCD_WR" pin RB4
signal "LCD_D0" pin RA14
signal "LCD_D1" pin RD3
signal "LCD_D2" pin RE8
signal "LCD_D3" pin RD0
signal "LCD_D4" pin RF1
signal "LCD_D5" pin RD1
signal "LCD_D6" pin RD2
signal "LCD_D7" pin RE9

82
sys/pic32/wf32/Config-swtft
View File

@@ -1,82 +0,0 @@
#
# chipKIT WF32 board with microSD card on 2.4" LCD TFT display shield
#
# To build the kernel, use:
# cd sys/pic32/wf32
# kconfig Config
# make clean
# make
#
# Format of this file is described on page:
# http://retrobsd.org/wiki/doku.php/doc/kconfig
#
architecture "pic32"
cpu "PIC32MX7" # Processor variant
board "WF32" # Board type
ldscript "max32/bootloader.ld" # Linker script
# Standard system options
options "CPU_KHZ=80000" # Oscillator frequency of CPU core
options "BUS_KHZ=80000" # Frequency of peripheral bus
options "BUS_DIV=1" # Bus clock divisor 1/2/4/8
# LEDs
signal "LED_KERNEL" pin RA0 # kernel activity indicator
signal "LED_DISK" pin RA1 # disk activity indicator
# Root filesystem at /dev/sd0a, swap at /dev/sd0b
config unix root on sd0a
swap on sd0b
# Serial UART ports
device uart1 # Serial-to-USB converter
# Console options
options "CONS_MAJOR=UART_MAJOR" # UART device
options "CONS_MINOR=0" # /dev/tty0
# SPI ports
controller spi2 # SD card
# microSD card
device sd0 at spi2 pin RD4 # select pin RD4
options "SD_MHZ=10" # speed 10 MHz
# General purpose I/O ports
# Flags define a mask of available pins
# The following pins excluded:
# RF2, RF8 - uart1
# RG6, RG7, RG8, RD4 - spi2, SD card
# RA14, RB0, RB2, RB4,
# RB8, RB10, RD0, RD1,
# RD2, RD3, RE8, RE9, RF0 - LCD display
#
device gpio0 flags 0x86ff # port A
device gpio1 flags 0xfaea # port B
device gpio2 flags 0xf01e # port C
device gpio3 flags 0xffe0 # port D
device gpio4 flags 0x00ff # port E
device gpio5 flags 0x303a # port F
device gpio6 flags 0xf20f # port G
# ADC driver
device adc
# PWM driver
device pwm
# ST7781 TFT display driver
device swtft
signal "LCD_RST" pin RB10
signal "LCD_CS" pin RB0
signal "LCD_RD" pin RB2
signal "LCD_RS" pin RB8
signal "LCD_WR" pin RB4
signal "LCD_D0" pin RA14
signal "LCD_D1" pin RD3
signal "LCD_D2" pin RE8
signal "LCD_D3" pin RD0
signal "LCD_D4" pin RF0
signal "LCD_D5" pin RD1
signal "LCD_D6" pin RD2
signal "LCD_D7" pin RE9

23
sys/pic32/wf32/Makefile
View File

@@ -12,6 +12,20 @@ PARAM += -DGPIO5_ENABLED
PARAM += -DGPIO6_ENABLED
PARAM += -DADC_ENABLED
PARAM += -DPWM_ENABLED
PARAM += -DSWTFT_ENABLED
PARAM += -DLCD_D7_PORT=TRISE -DLCD_D7_PIN=9
PARAM += -DLCD_D6_PORT=TRISD -DLCD_D6_PIN=2
PARAM += -DLCD_D5_PORT=TRISD -DLCD_D5_PIN=1
PARAM += -DLCD_D4_PORT=TRISF -DLCD_D4_PIN=1
PARAM += -DLCD_D3_PORT=TRISD -DLCD_D3_PIN=0
PARAM += -DLCD_D2_PORT=TRISE -DLCD_D2_PIN=8
PARAM += -DLCD_D1_PORT=TRISD -DLCD_D1_PIN=3
PARAM += -DLCD_D0_PORT=TRISA -DLCD_D0_PIN=14
PARAM += -DLCD_WR_PORT=TRISB -DLCD_WR_PIN=4
PARAM += -DLCD_RS_PORT=TRISB -DLCD_RS_PIN=8
PARAM += -DLCD_RD_PORT=TRISB -DLCD_RD_PIN=2
PARAM += -DLCD_CS_PORT=TRISB -DLCD_CS_PIN=0
PARAM += -DLCD_RST_PORT=TRISB -DLCD_RST_PIN=10
PARAM += -DLED_DISK_PORT=TRISA -DLED_DISK_PIN=1
PARAM += -DLED_KERNEL_PORT=TRISA -DLED_KERNEL_PIN=0
PARAM += -DSD_MHZ=10
@@ -65,7 +79,7 @@ OBJS = exec_aout.o exec_conf.o exec_elf.o exec_script.o exec_subr.o \
ufs_namei.o ufs_subr.o ufs_syscalls.o ufs_syscalls2.o \
vfs_vnops.o vm_sched.o vm_swap.o vm_swp.o clock.o cons.o devsw.o \
exception.o machdep.o mem.o signal.o swap.o sysctl.o adc.o \
gpio.o pwm.o sd.o spi.o spi_bus.o uart.o
gpio.o pwm.o sd.o st7781.o spi.o spi_bus.o uart.o
CFILES = $S/kernel/exec_aout.c $S/kernel/exec_conf.c $S/kernel/exec_elf.c \
$S/kernel/exec_script.c $S/kernel/exec_subr.c \
@@ -91,8 +105,8 @@ CFILES = $S/kernel/exec_aout.c $S/kernel/exec_conf.c $S/kernel/exec_elf.c \
$S/pic32/devsw.c $S/pic32/exception.c $S/pic32/machdep.c \
$S/pic32/mem.c $S/pic32/signal.c $S/pic32/swap.c \
$S/pic32/sysctl.c $S/pic32/adc.c $S/pic32/gpio.c $S/pic32/pwm.c \
$S/pic32/sd.c $S/pic32/spi.c $S/pic32/spi_bus.c $S/pic32/uart.c \
swapunix.c
$S/pic32/sd.c $S/pic32/st7781.c $S/pic32/spi.c \
$S/pic32/spi_bus.c $S/pic32/uart.c swapunix.c
# load lines for config "xxx" will be emitted as:
# xxx: ${SYSTEM_DEP} swapxxx.o
@@ -336,6 +350,9 @@ pwm.o: $S/pic32/pwm.c
sd.o: $S/pic32/sd.c
${COMPILE_C}
st7781.o: $S/pic32/st7781.c
${COMPILE_C}
spi.o: $S/pic32/spi.c
${COMPILE_C}