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/*
* This file is subject to the terms of the GFX License. If a copy of
* the license was not distributed with this file, you can obtain one at:
*
* http://ugfx.org/license.html
*/
/**
* @file drivers/gdisp/HX8347D/gdisp_lld_board_st_stm32f4_discovery.h
* @brief GDISP Graphic Driver subsystem board SPI interface for the HX8347D display.
*
* @addtogroup GDISP
* @{
*/
#ifndef _GDISP_LLD_BOARD_H
#define _GDISP_LLD_BOARD_H
// Overrides
#ifndef GDISP_INITIAL_BACKLIGHT
#define GDISP_INITIAL_BACKLIGHT 50
#endif
/* Pin assignments */
#define SET_RST palSetPad(GPIOB, 8)
#define CLR_RST palClearPad(GPIOB, 8)
#define SET_DATA palSetPad(GPIOB, 9)
#define CLR_DATA palClearPad(GPIOB, 9)
#define SET_CS palSetPad(GPIOA, 4)
#define CLR_CS palClearPad(GPIOA, 4)
/* PWM configuration structure. We use timer 4 channel 2 (orange LED on board). */
static const PWMConfig pwmcfg = {
1000000, /* 1 MHz PWM clock frequency. */
100, /* PWM period is 100 cycles. */
NULL,
{
{PWM_OUTPUT_ACTIVE_HIGH, NULL},
{PWM_OUTPUT_ACTIVE_HIGH, NULL},
{PWM_OUTPUT_ACTIVE_HIGH, NULL},
{PWM_OUTPUT_ACTIVE_HIGH, NULL}
},
0
};
/*
* SPI1 configuration structure.
* Speed 42MHz, CPHA=0, CPOL=0, 8bits frames, MSb transmitted first.
* The slave select line is the pin 4 on the port GPIOA.
*/
static const SPIConfig spi1cfg_8bit = {
NULL,
/* HW dependent part.*/
GPIOA,
4,
0 //SPI_CR1_BR_0
};
/*
* SPI1 configuration structure.
* Speed 42MHz, CPHA=0, CPOL=0, 16bits frames, MSb transmitted first.
* The slave select line is the pin 4 on the port GPIOA.
*/
static const SPIConfig spi1cfg_16bit = {
NULL,
/* HW dependent part.*/
GPIOA,
4,
SPI_CR1_DFF //SPI_CR1_BR_0
};
/**
* @brief Initialise the board for the display.
* @notes This board definition uses GPIO and SPI. It assumes exclusive access to these GPIO pins but not necessarily the SPI port.
*
* @notapi
*/
static inline void init_board(void) {
/* Display backlight control */
/* TIM4 is an alternate function 2 (AF2) */
pwmStart(&PWMD4, &pwmcfg);
palSetPadMode(GPIOD, 13, PAL_MODE_ALTERNATE(2));
pwmEnableChannel(&PWMD4, 1, 100);
palSetPadMode(GPIOB, 8, PAL_MODE_OUTPUT_PUSHPULL|PAL_STM32_OSPEED_HIGHEST); /* RST */
palSetPadMode(GPIOB, 9, PAL_MODE_OUTPUT_PUSHPULL|PAL_STM32_OSPEED_HIGHEST); /* RS */
/*
* Initializes the SPI driver 1. The SPI1 signals are routed as follow:
* PB12 - NSS.
* PB13 - SCK.
* PB14 - MISO.
* PB15 - MOSI.
*/
SET_CS; SET_DATA;
spiStart(&SPID1, &spi1cfg_8bit);
palSetPadMode(GPIOA, 4, PAL_MODE_OUTPUT_PUSHPULL|PAL_STM32_OSPEED_HIGHEST); /* NSS. */
palSetPadMode(GPIOA, 5, PAL_MODE_ALTERNATE(5)|PAL_STM32_OSPEED_HIGHEST); /* SCK. */
palSetPadMode(GPIOA, 6, PAL_MODE_ALTERNATE(5)); /* MISO. */
palSetPadMode(GPIOA, 7, PAL_MODE_ALTERNATE(5)|PAL_STM32_OSPEED_HIGHEST); /* MOSI. */
}
/**
* @brief Set or clear the lcd reset pin.
*
* @param[in] state TRUE = lcd in reset, FALSE = normal operation
*
* @notapi
*/
static inline void setpin_reset(bool_t state) {
if (state) {
CLR_RST;
} else {
SET_RST;
}
}
/**
* @brief Set the lcd back-light level.
*
* @param[in] percent 0 to 100%
*
* @notapi
*/
static inline void set_backlight(uint8_t percent) {
pwmEnableChannel(&PWMD4, 1, percent);
}
/**
* @brief Take exclusive control of the bus
* @notapi
*/
static inline void acquire_bus(void) {
spiAcquireBus(&SPID1);
while(((SPI1->SR & SPI_SR_TXE) == 0) || ((SPI1->SR & SPI_SR_BSY) != 0)); // Safety
CLR_CS;
}
/**
* @brief Release exclusive control of the bus
* @notapi
*/
static inline void release_bus(void) {
SET_CS;
spiReleaseBus(&SPID1);
}
/**
* @brief Set the bus in 16 bit mode
* @notapi
*/
static inline void busmode16(void) {
spiStart(&SPID1, &spi1cfg_16bit);
}
/**
* @brief Set the bus in 8 bit mode (the default)
* @notapi
*/
static inline void busmode8(void) {
spiStart(&SPID1, &spi1cfg_8bit);
}
/**
* @brief Set which index register to use.
*
* @param[in] index The index register to set
*
* @notapi
*/
static inline void write_index(uint8_t cmd) {
CLR_DATA;
SPI1->DR = cmd;
while(((SPI1->SR & SPI_SR_TXE) == 0) || ((SPI1->SR & SPI_SR_BSY) != 0));
SET_DATA;
}
/**
* @brief Send a command to the lcd.
*
* @param[in] data The data to send
*
* @notapi
*/
static inline void write_reg(uint8_t cmd, uint8_t data) {
write_index(cmd);
SPI1->DR = data;
while(((SPI1->SR & SPI_SR_TXE) == 0) || ((SPI1->SR & SPI_SR_BSY) != 0));
}
static inline void write_ram16(uint16_t data) {
SPI1->DR = data;
while((SPI1->SR & SPI_SR_TXE) == 0);
}
#endif /* _GDISP_LLD_BOARD_H */
/** @} */
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