TFT (plus Hardware SPI) for LPC (#19139)
This commit is contained in:
Victor Oliveira
GitHub
@ -30,7 +30,7 @@
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*/
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/**
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* Hardware SPI and a software SPI implementations are included in this file.
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* Hardware SPI and Software SPI implementations are included in this file.
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* The hardware SPI runs faster and has higher throughput but is not compatible
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* with some LCD interfaces/adapters.
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*
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@ -51,6 +51,10 @@
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#include "../../inc/MarlinConfig.h"
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#include <SPI.h>
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// Hardware SPI and SPIClass
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#include <lpc17xx_pinsel.h>
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#include <lpc17xx_clkpwr.h>
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// ------------------------
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// Public functions
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// ------------------------
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@ -96,12 +100,6 @@
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#else
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// Hardware SPI
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#include <lpc17xx_pinsel.h>
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#include <lpc17xx_ssp.h>
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#include <lpc17xx_clkpwr.h>
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// decide which HW SPI device to use
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#ifndef LPC_HW_SPI_DEV
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#if (SCK_PIN == P0_07 && MISO_PIN == P0_08 && MOSI_PIN == P0_09)
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@ -114,7 +112,7 @@
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#endif
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#endif
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#endif
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#if (LPC_HW_SPI_DEV == 0)
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#if LPC_HW_SPI_DEV == 0
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#define LPC_SSPn LPC_SSP0
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#else
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#define LPC_SSPn LPC_SSP1
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@ -192,7 +190,7 @@
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for (uint16_t i = 0; i < nbyte; i++) buf[i] = doio(0xFF);
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}
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static uint8_t spiTransfer(uint8_t b) {
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uint8_t spiTransfer(uint8_t b) {
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return doio(b);
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}
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@ -211,30 +209,236 @@
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#endif // LPC_SOFTWARE_SPI
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void SPIClass::begin() { spiBegin(); }
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void SPIClass::beginTransaction(const SPISettings &cfg) {
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uint8_t spiRate;
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switch (cfg.spiRate()) {
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case 8000000: spiRate = 0; break;
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case 4000000: spiRate = 1; break;
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case 2000000: spiRate = 2; break;
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case 1000000: spiRate = 3; break;
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case 500000: spiRate = 4; break;
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case 250000: spiRate = 5; break;
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case 125000: spiRate = 6; break;
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default: spiRate = 2; break;
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}
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spiInit(spiRate);
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/**
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* @brief Wait until TXE (tx empty) flag is set and BSY (busy) flag unset.
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*/
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static inline void waitSpiTxEnd(LPC_SSP_TypeDef *spi_d) {
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while (SSP_GetStatus(spi_d, SSP_STAT_TXFIFO_EMPTY) == RESET) { /* nada */ } // wait until TXE=1
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while (SSP_GetStatus(spi_d, SSP_STAT_BUSY) == SET) { /* nada */ } // wait until BSY=0
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}
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uint8_t SPIClass::transfer(const uint8_t B) { return spiTransfer(B); }
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SPIClass::SPIClass(uint8_t device) {
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// Init things specific to each SPI device
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// clock divider setup is a bit of hack, and needs to be improved at a later date.
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PINSEL_CFG_Type PinCfg; // data structure to hold init values
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#if BOARD_NR_SPI >= 1
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_settings[0].spi_d = LPC_SSP0;
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// _settings[0].clockDivider = determine_baud_rate(_settings[0].spi_d, _settings[0].clock);
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PinCfg.Funcnum = 2;
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PinCfg.OpenDrain = 0;
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PinCfg.Pinmode = 0;
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PinCfg.Pinnum = LPC176x::pin_bit(BOARD_SPI1_SCK_PIN);
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PinCfg.Portnum = LPC176x::pin_port(BOARD_SPI1_SCK_PIN);
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PINSEL_ConfigPin(&PinCfg);
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SET_OUTPUT(BOARD_SPI1_SCK_PIN);
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PinCfg.Pinnum = LPC176x::pin_bit(BOARD_SPI1_MISO_PIN);
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PinCfg.Portnum = LPC176x::pin_port(BOARD_SPI1_MISO_PIN);
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PINSEL_ConfigPin(&PinCfg);
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SET_INPUT(BOARD_SPI1_MISO_PIN);
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PinCfg.Pinnum = LPC176x::pin_bit(BOARD_SPI1_MOSI_PIN);
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PinCfg.Portnum = LPC176x::pin_port(BOARD_SPI1_MOSI_PIN);
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PINSEL_ConfigPin(&PinCfg);
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SET_OUTPUT(BOARD_SPI1_MOSI_PIN);
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#endif
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#if BOARD_NR_SPI >= 2
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_settings[1].spi_d = LPC_SSP1;
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// _settings[1].clockDivider = determine_baud_rate(_settings[1].spi_d, _settings[1].clock);
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PinCfg.Funcnum = 2;
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PinCfg.OpenDrain = 0;
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PinCfg.Pinmode = 0;
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PinCfg.Pinnum = LPC176x::pin_bit(BOARD_SPI2_SCK_PIN);
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PinCfg.Portnum = LPC176x::pin_port(BOARD_SPI2_SCK_PIN);
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PINSEL_ConfigPin(&PinCfg);
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SET_OUTPUT(BOARD_SPI2_SCK_PIN);
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PinCfg.Pinnum = LPC176x::pin_bit(BOARD_SPI2_MISO_PIN);
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PinCfg.Portnum = LPC176x::pin_port(BOARD_SPI2_MISO_PIN);
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PINSEL_ConfigPin(&PinCfg);
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SET_INPUT(BOARD_SPI2_MISO_PIN);
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PinCfg.Pinnum = LPC176x::pin_bit(BOARD_SPI2_MOSI_PIN);
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PinCfg.Portnum = LPC176x::pin_port(BOARD_SPI2_MOSI_PIN);
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PINSEL_ConfigPin(&PinCfg);
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SET_OUTPUT(BOARD_SPI2_MOSI_PIN);
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#endif
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setModule(device);
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/* Initialize GPDMA controller */
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//TODO: call once in the constructor? or each time?
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GPDMA_Init();
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}
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void SPIClass::begin() {
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updateSettings();
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SSP_Cmd(_currentSetting->spi_d, ENABLE); // start SSP running
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}
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void SPIClass::beginTransaction(const SPISettings &cfg) {
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setBitOrder(cfg.bitOrder);
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setDataMode(cfg.dataMode);
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setDataSize(cfg.dataSize);
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//setClockDivider(determine_baud_rate(_currentSetting->spi_d, settings.clock));
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begin();
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}
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uint8_t SPIClass::transfer(const uint16_t b) {
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/* send and receive a single byte */
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SSP_ReceiveData(_currentSetting->spi_d); // read any previous data
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SSP_SendData(_currentSetting->spi_d, b);
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waitSpiTxEnd(_currentSetting->spi_d); // wait for it to finish
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return SSP_ReceiveData(_currentSetting->spi_d);
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}
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uint16_t SPIClass::transfer16(const uint16_t data) {
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return (transfer((data >> 8) & 0xFF) << 8)
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| (transfer(data & 0xFF) & 0xFF);
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}
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SPIClass SPI;
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void SPIClass::end() {
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// SSP_Cmd(_currentSetting->spi_d, DISABLE); // stop device or SSP_DeInit?
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SSP_DeInit(_currentSetting->spi_d);
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}
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void SPIClass::send(uint8_t data) {
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SSP_SendData(_currentSetting->spi_d, data);
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}
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void SPIClass::dmaSend(void *buf, uint16_t length, bool minc) {
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//TODO: LPC dma can only write 0xFFF bytes at once.
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GPDMA_Channel_CFG_Type GPDMACfg;
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/* Configure GPDMA channel 0 -------------------------------------------------------------*/
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/* DMA Channel 0 */
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GPDMACfg.ChannelNum = 0;
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// Source memory
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GPDMACfg.SrcMemAddr = (uint32_t)buf;
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// Destination memory - Not used
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GPDMACfg.DstMemAddr = 0;
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// Transfer size
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GPDMACfg.TransferSize = (minc ? length : 1);
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// Transfer width
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GPDMACfg.TransferWidth = (_currentSetting->dataSize == DATA_SIZE_16BIT) ? GPDMA_WIDTH_HALFWORD : GPDMA_WIDTH_BYTE;
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// Transfer type
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GPDMACfg.TransferType = GPDMA_TRANSFERTYPE_M2P;
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// Source connection - unused
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GPDMACfg.SrcConn = 0;
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// Destination connection
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GPDMACfg.DstConn = (_currentSetting->spi_d == LPC_SSP0) ? GPDMA_CONN_SSP0_Tx : GPDMA_CONN_SSP1_Tx;
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GPDMACfg.DMALLI = 0;
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// Enable dma on SPI
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SSP_DMACmd(_currentSetting->spi_d, SSP_DMA_TX, ENABLE);
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// if minc=false, I'm repeating the same byte 'length' times, as I could not find yet how do GPDMA without memory increment
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do {
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// Setup channel with given parameter
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GPDMA_Setup(&GPDMACfg);
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// enabled dma
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GPDMA_ChannelCmd(0, ENABLE);
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// wait data transfer
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while (!GPDMA_IntGetStatus(GPDMA_STAT_INTTC, 0) && !GPDMA_IntGetStatus(GPDMA_STAT_INTERR, 0)) { }
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// clear err and int
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GPDMA_ClearIntPending (GPDMA_STATCLR_INTTC, 0);
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GPDMA_ClearIntPending (GPDMA_STATCLR_INTERR, 0);
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// dma disable
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GPDMA_ChannelCmd(0, DISABLE);
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--length;
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} while (!minc && length > 0);
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waitSpiTxEnd(_currentSetting->spi_d);
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SSP_DMACmd(_currentSetting->spi_d, SSP_DMA_TX, DISABLE);
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}
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uint16_t SPIClass::read() {
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return SSP_ReceiveData(_currentSetting->spi_d);
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}
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void SPIClass::read(uint8_t *buf, uint32_t len) {
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for (uint16_t i = 0; i < len; i++) buf[i] = transfer(0xFF);
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}
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void SPIClass::setClock(uint32_t clock) {
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_currentSetting->clock = clock;
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}
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void SPIClass::setModule(uint8_t device) {
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_currentSetting = &_settings[device - 1];// SPI channels are called 1 2 and 3 but the array is zero indexed
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}
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void SPIClass::setBitOrder(uint8_t bitOrder) {
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_currentSetting->bitOrder = bitOrder;
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}
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void SPIClass::setDataMode(uint8_t dataMode) {
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_currentSetting->dataSize = dataMode;
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}
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void SPIClass::setDataSize(uint32_t ds) {
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_currentSetting->dataSize = ds;
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}
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/**
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* Set up/tear down
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*/
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void SPIClass::updateSettings() {
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//SSP_DeInit(_currentSetting->spi_d); //todo: need force de init?!
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// divide PCLK by 2 for SSP0
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CLKPWR_SetPCLKDiv(_currentSetting->spi_d == LPC_SSP0 ? CLKPWR_PCLKSEL_SSP0 : CLKPWR_PCLKSEL_SSP1, CLKPWR_PCLKSEL_CCLK_DIV_2);
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SSP_CFG_Type HW_SPI_init; // data structure to hold init values
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SSP_ConfigStructInit(&HW_SPI_init); // set values for SPI mode
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HW_SPI_init.ClockRate = _currentSetting->clock;
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HW_SPI_init.Databit = _currentSetting->dataSize;
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/**
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* SPI Mode CPOL CPHA Shift SCK-edge Capture SCK-edge
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* 0 0 0 Falling Rising
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* 1 0 1 Rising Falling
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* 2 1 0 Rising Falling
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* 3 1 1 Falling Rising
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*/
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switch (_currentSetting->dataMode) {
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case SPI_MODE0:
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HW_SPI_init.CPHA = SSP_CPHA_FIRST;
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HW_SPI_init.CPOL = SSP_CPOL_HI;
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break;
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case SPI_MODE1:
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HW_SPI_init.CPHA = SSP_CPHA_SECOND;
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HW_SPI_init.CPOL = SSP_CPOL_HI;
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break;
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case SPI_MODE2:
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HW_SPI_init.CPHA = SSP_CPHA_FIRST;
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HW_SPI_init.CPOL = SSP_CPOL_LO;
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break;
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case SPI_MODE3:
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HW_SPI_init.CPHA = SSP_CPHA_SECOND;
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HW_SPI_init.CPOL = SSP_CPOL_LO;
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break;
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default:
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break;
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}
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// TODO: handle bitOrder
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SSP_Init(_currentSetting->spi_d, &HW_SPI_init); // puts the values into the proper bits in the SSP0 registers
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}
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#if MISO_PIN == BOARD_SPI1_MISO_PIN
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SPIClass SPI(1);
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#elif MISO_PIN == BOARD_SPI2_MISO_PIN
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SPIClass SPI(2);
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#endif
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#endif // TARGET_LPC1768
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