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