2013-04-16 12:44:54 +02:00
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/*
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u8g_com_arduino_hw_spi.c
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Universal 8bit Graphics Library
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Copyright (c) 2011, olikraus@gmail.com
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All rights reserved.
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Redistribution and use in source and binary forms, with or without modification,
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are permitted provided that the following conditions are met:
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* Redistributions of source code must retain the above copyright notice, this list
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of conditions and the following disclaimer.
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* Redistributions in binary form must reproduce the above copyright notice, this
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list of conditions and the following disclaimer in the documentation and/or other
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materials provided with the distribution.
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THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND
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CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES,
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INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
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MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR
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CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
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CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
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STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
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ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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2015-05-31 20:25:36 +02:00
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SPI Clock Cycle Type
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SSD1351 50ns 20 MHz
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SSD1322 300ns 3.3 MHz
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SSD1327 300ns
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SSD1306 300ns
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ST7565 400ns 2.5 MHz
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ST7920 400ns
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Arduino DUE
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PA25 MISO
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PA26 MOSI 75
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PA27 SCLK 76
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typedef struct {
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WoReg SPI_CR; (Spi Offset: 0x00) Control Register
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RwReg SPI_MR; (Spi Offset: 0x04) Mode Register
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RoReg SPI_RDR; (Spi Offset: 0x08) Receive Data Register
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WoReg SPI_TDR; (Spi Offset: 0x0C) Transmit Data Register
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RoReg SPI_SR; (Spi Offset: 0x10) Status Register
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WoReg SPI_IER; (Spi Offset: 0x14) Interrupt Enable Register
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WoReg SPI_IDR; (Spi Offset: 0x18) Interrupt Disable Register
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RoReg SPI_IMR; (Spi Offset: 0x1C) Interrupt Mask Register
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RoReg Reserved1[4];
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RwReg SPI_CSR[4]; (Spi Offset: 0x30) Chip Select Register
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RoReg Reserved2[41];
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RwReg SPI_WPMR; (Spi Offset: 0xE4) Write Protection Control Register
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RoReg SPI_WPSR; (Spi Offset: 0xE8) Write Protection Status Register
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} Spi;
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Power Management Controller (PMC)
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arduino-1.5.2/hardware/arduino/sam/system/CMSIS/Device/ATMEL/sam3xa/include/instance/instance_pmc.h
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- enable PIO
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REG_PMC_PCER0 = 1UL << ID_PIOA
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- enable SPI
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REG_PMC_PCER0 = 1UL << ID_SPI0
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- enable PIOA and SPI0
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REG_PMC_PCER0 = (1UL << ID_PIOA) | (1UL << ID_SPI0);
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Parallel Input/Output Controller (PIO)
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arduino-1.5.2/hardware/arduino/sam/system/CMSIS/Device/ATMEL/sam3xa/include/instance/instance_pioa.h
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- enable special function of the pin: disable PIO on A26 and A27:
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REG_PIOA_PDR = 0x0c000000
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PIOA->PIO_PDR = 0x0c000000
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SPI
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SPI0->SPI_CR = SPI_CR_SPIDIS
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SPI0->SPI_CR = SPI_CR_SWRST ;
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SPI0->SPI_CR = SPI_CR_SWRST ;
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SPI0->SPI_CR = SPI_CR_SPIEN
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2013-04-16 12:44:54 +02:00
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2015-05-31 20:25:36 +02:00
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Bit 0: Master Mode = 1 (active)
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Bit 1: Peripheral Select = 0 (fixed)
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Bit 2: Chip Select Decode Mode = 1 (4 to 16)
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Bit 4: Mode Fault Detection = 1 (disabled)
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Bit 5: Wait Data Read = 0 (disabled)
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Bit 7: Loop Back Mode = 0 (disabled)
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Bit 16-19: Peripheral Chip Select = 0 (chip select 0)
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SPI0->SPI_MR = SPI_MR_MSTR | SPI_MR_PCSDEC | SPI_MR_MODFDIS
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Bit 0: Clock Polarity = 0
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Bit 1: Clock Phase = 0
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Bit 4-7: Bits = 0 (8 Bit)
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Bit 8-15: SCBR = 1
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SPI0->SPI_CSR[0] = SPI_CSR_SCBR(x) Serial Baud Rate
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SCBR / 84000000 > 50 / 1000000000
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SCBR / 84 > 5 / 100
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SCBR > 50 *84 / 1000 --> SCBR=5
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SCBR > 300*84 / 1000 --> SCBR=26
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SCBR > 400*84 / 1000 --> SCBR=34
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Arduino Due test code:
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REG_PMC_PCER0 = (1UL << ID_PIOA) | (1UL << ID_SPI0);
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REG_PIOA_PDR = 0x0c000000;
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SPI0->SPI_CR = SPI_CR_SPIDIS;
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SPI0->SPI_CR = SPI_CR_SWRST;
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SPI0->SPI_CR = SPI_CR_SWRST;
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SPI0->SPI_CR = SPI_CR_SPIEN;
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SPI0->SPI_MR = SPI_MR_MSTR | SPI_MR_PCSDEC | SPI_MR_MODFDIS;
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SPI0->SPI_CSR[0] = SPI_CSR_SCBR(30);
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for(;;)
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{
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while( (SPI0->SPI_SR & SPI_SR_TDRE) == 0 )
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;
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SPI0->SPI_TDR = 0x050;
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}
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2013-04-16 12:44:54 +02:00
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*/
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#include "u8g.h"
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#if defined(ARDUINO)
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#if defined(__AVR__)
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2015-05-31 20:25:36 +02:00
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#define U8G_ARDUINO_ATMEGA_HW_SPI
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/* remove the definition for attiny */
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#if __AVR_ARCH__ == 2
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#undef U8G_ARDUINO_ATMEGA_HW_SPI
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#endif
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#if __AVR_ARCH__ == 25
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#undef U8G_ARDUINO_ATMEGA_HW_SPI
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#endif
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#endif
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#if defined(U8G_ARDUINO_ATMEGA_HW_SPI)
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2013-04-16 12:44:54 +02:00
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#include <avr/interrupt.h>
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#include <avr/io.h>
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#if ARDUINO < 100
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#include <WProgram.h>
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/* fixed pins */
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#if defined(__AVR_ATmega644P__) || defined(__AVR_ATmega1284P__) // Sanguino.cc board
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#define PIN_SCK 7
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#define PIN_MISO 6
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#define PIN_MOSI 5
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#define PIN_CS 4
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#else // Arduino Board
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#define PIN_SCK 13
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#define PIN_MISO 12
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#define PIN_MOSI 11
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#define PIN_CS 10
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#endif // (__AVR_ATmega644P__) || defined(__AVR_ATmega1284P__)
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#else
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#include <Arduino.h>
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/* use Arduino pin definitions */
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#define PIN_SCK SCK
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#define PIN_MISO MISO
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#define PIN_MOSI MOSI
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#define PIN_CS SS
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#endif
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//static uint8_t u8g_spi_out(uint8_t data) U8G_NOINLINE;
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static uint8_t u8g_spi_out(uint8_t data)
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{
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/* unsigned char x = 100; */
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/* send data */
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SPDR = data;
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/* wait for transmission */
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while (!(SPSR & (1<<SPIF)))
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;
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/* clear the SPIF flag by reading SPDR */
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return SPDR;
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}
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uint8_t u8g_com_arduino_hw_spi_fn(u8g_t *u8g, uint8_t msg, uint8_t arg_val, void *arg_ptr)
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{
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switch(msg)
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{
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case U8G_COM_MSG_STOP:
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break;
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case U8G_COM_MSG_INIT:
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u8g_com_arduino_assign_pin_output_high(u8g);
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pinMode(PIN_SCK, OUTPUT);
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digitalWrite(PIN_SCK, LOW);
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pinMode(PIN_MOSI, OUTPUT);
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digitalWrite(PIN_MOSI, LOW);
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/* pinMode(PIN_MISO, INPUT); */
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pinMode(PIN_CS, OUTPUT); /* system chip select for the atmega board */
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digitalWrite(PIN_CS, HIGH);
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/*
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SPR1 SPR0
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0 0 fclk/4
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0 1 fclk/16
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1 0 fclk/64
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1 1 fclk/128
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*/
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SPCR = 0;
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2015-05-31 20:25:36 +02:00
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SPCR = (1<<SPE) | (1<<MSTR)|(0<<SPR1)|(0<<SPR0)|(0<<CPOL)|(0<<CPHA);
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2013-04-16 12:44:54 +02:00
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#ifdef U8G_HW_SPI_2X
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SPSR = (1 << SPI2X); /* double speed, issue 89 */
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2015-05-31 20:25:36 +02:00
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#else
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if ( arg_val <= U8G_SPI_CLK_CYCLE_50NS )
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{
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SPSR = (1 << SPI2X); /* double speed, issue 89 */
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}
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2013-04-16 12:44:54 +02:00
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#endif
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2015-05-31 20:25:36 +02:00
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2013-04-16 12:44:54 +02:00
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break;
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case U8G_COM_MSG_ADDRESS: /* define cmd (arg_val = 0) or data mode (arg_val = 1) */
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u8g_com_arduino_digital_write(u8g, U8G_PI_A0, arg_val);
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break;
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case U8G_COM_MSG_CHIP_SELECT:
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if ( arg_val == 0 )
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{
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/* disable */
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u8g_com_arduino_digital_write(u8g, U8G_PI_CS, HIGH);
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}
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else
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{
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/* enable */
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u8g_com_arduino_digital_write(u8g, U8G_PI_SCK, LOW);
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u8g_com_arduino_digital_write(u8g, U8G_PI_CS, LOW);
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}
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break;
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case U8G_COM_MSG_RESET:
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if ( u8g->pin_list[U8G_PI_RESET] != U8G_PIN_NONE )
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u8g_com_arduino_digital_write(u8g, U8G_PI_RESET, arg_val);
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break;
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case U8G_COM_MSG_WRITE_BYTE:
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u8g_spi_out(arg_val);
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break;
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case U8G_COM_MSG_WRITE_SEQ:
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{
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register uint8_t *ptr = arg_ptr;
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while( arg_val > 0 )
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{
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u8g_spi_out(*ptr++);
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arg_val--;
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}
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}
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break;
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case U8G_COM_MSG_WRITE_SEQ_P:
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{
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register uint8_t *ptr = arg_ptr;
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while( arg_val > 0 )
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{
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u8g_spi_out(u8g_pgm_read(ptr));
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ptr++;
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arg_val--;
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}
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}
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break;
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}
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return 1;
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}
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/* #elif defined(__18CXX) || defined(__PIC32MX) */
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2015-05-31 20:25:36 +02:00
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#elif defined(__SAM3X8E__) // Arduino Due, maybe we should better check for __SAM3X8E__
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#include <Arduino.h>
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/* use Arduino pin definitions */
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#define PIN_SCK SCK
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#define PIN_MISO MISO
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#define PIN_MOSI MOSI
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#define PIN_CS SS
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static uint8_t u8g_spi_out(uint8_t data)
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{
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/* wait until tx register is empty */
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while( (SPI0->SPI_SR & SPI_SR_TDRE) == 0 )
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;
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/* send data */
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SPI0->SPI_TDR = (uint32_t)data;
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return data;
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}
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uint8_t u8g_com_arduino_hw_spi_fn(u8g_t *u8g, uint8_t msg, uint8_t arg_val, void *arg_ptr)
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{
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switch(msg)
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{
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case U8G_COM_MSG_STOP:
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break;
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case U8G_COM_MSG_INIT:
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u8g_com_arduino_assign_pin_output_high(u8g);
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u8g_com_arduino_digital_write(u8g, U8G_PI_CS, HIGH);
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/* Arduino Due specific code */
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/* enable PIOA and SPI0 */
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REG_PMC_PCER0 = (1UL << ID_PIOA) | (1UL << ID_SPI0);
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/* disable PIO on A26 and A27 */
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REG_PIOA_PDR = 0x0c000000;
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/* reset SPI0 (from sam lib) */
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SPI0->SPI_CR = SPI_CR_SPIDIS;
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SPI0->SPI_CR = SPI_CR_SWRST;
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SPI0->SPI_CR = SPI_CR_SWRST;
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SPI0->SPI_CR = SPI_CR_SPIEN;
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u8g_MicroDelay();
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/* master mode, no fault detection, chip select 0 */
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SPI0->SPI_MR = SPI_MR_MSTR | SPI_MR_PCSDEC | SPI_MR_MODFDIS;
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/* Polarity, Phase, 8 Bit data transfer, baud rate */
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/* x * 1000 / 84 --> clock cycle in ns
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5 * 1000 / 84 = 58 ns
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SCBR > 50 *84 / 1000 --> SCBR=5
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SCBR > 300*84 / 1000 --> SCBR=26
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SCBR > 400*84 / 1000 --> SCBR=34
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*/
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if ( arg_val <= U8G_SPI_CLK_CYCLE_50NS )
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{
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SPI0->SPI_CSR[0] = SPI_CSR_SCBR(5) | 1;
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}
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else if ( arg_val <= U8G_SPI_CLK_CYCLE_300NS )
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{
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SPI0->SPI_CSR[0] = SPI_CSR_SCBR(26) | 1;
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}
|
|
|
|
else if ( arg_val <= U8G_SPI_CLK_CYCLE_400NS )
|
|
|
|
{
|
|
|
|
SPI0->SPI_CSR[0] = SPI_CSR_SCBR(34) | 1;
|
|
|
|
}
|
|
|
|
else
|
|
|
|
{
|
|
|
|
SPI0->SPI_CSR[0] = SPI_CSR_SCBR(84) | 1;
|
|
|
|
}
|
|
|
|
|
|
|
|
u8g_MicroDelay();
|
|
|
|
break;
|
|
|
|
|
|
|
|
case U8G_COM_MSG_ADDRESS: /* define cmd (arg_val = 0) or data mode (arg_val = 1) */
|
|
|
|
u8g_com_arduino_digital_write(u8g, U8G_PI_A0, arg_val);
|
|
|
|
u8g_MicroDelay();
|
|
|
|
break;
|
|
|
|
|
|
|
|
case U8G_COM_MSG_CHIP_SELECT:
|
|
|
|
if ( arg_val == 0 )
|
|
|
|
{
|
|
|
|
/* disable */
|
|
|
|
u8g_MicroDelay(); /* this delay is required to avoid that the display is switched off too early --> DOGS102 with DUE */
|
|
|
|
u8g_com_arduino_digital_write(u8g, U8G_PI_CS, HIGH);
|
|
|
|
u8g_MicroDelay();
|
|
|
|
}
|
|
|
|
else
|
|
|
|
{
|
|
|
|
/* enable */
|
|
|
|
//u8g_com_arduino_digital_write(u8g, U8G_PI_SCK, LOW);
|
|
|
|
u8g_com_arduino_digital_write(u8g, U8G_PI_CS, LOW);
|
|
|
|
u8g_MicroDelay();
|
|
|
|
}
|
|
|
|
break;
|
|
|
|
|
|
|
|
case U8G_COM_MSG_RESET:
|
|
|
|
if ( u8g->pin_list[U8G_PI_RESET] != U8G_PIN_NONE )
|
|
|
|
u8g_com_arduino_digital_write(u8g, U8G_PI_RESET, arg_val);
|
|
|
|
break;
|
|
|
|
|
|
|
|
case U8G_COM_MSG_WRITE_BYTE:
|
|
|
|
u8g_spi_out(arg_val);
|
|
|
|
u8g_MicroDelay();
|
|
|
|
break;
|
|
|
|
|
|
|
|
case U8G_COM_MSG_WRITE_SEQ:
|
|
|
|
{
|
|
|
|
register uint8_t *ptr = arg_ptr;
|
|
|
|
while( arg_val > 0 )
|
|
|
|
{
|
|
|
|
u8g_spi_out(*ptr++);
|
|
|
|
arg_val--;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
break;
|
|
|
|
case U8G_COM_MSG_WRITE_SEQ_P:
|
|
|
|
{
|
|
|
|
register uint8_t *ptr = arg_ptr;
|
|
|
|
while( arg_val > 0 )
|
|
|
|
{
|
|
|
|
u8g_spi_out(u8g_pgm_read(ptr));
|
|
|
|
ptr++;
|
|
|
|
arg_val--;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
break;
|
|
|
|
}
|
|
|
|
return 1;
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
#else /* U8G_ARDUINO_ATMEGA_HW_SPI */
|
2013-04-16 12:44:54 +02:00
|
|
|
|
2015-05-31 20:25:36 +02:00
|
|
|
#endif /* U8G_ARDUINO_ATMEGA_HW_SPI */
|
2013-04-16 12:44:54 +02:00
|
|
|
|
|
|
|
#else /* ARDUINO */
|
|
|
|
|
|
|
|
uint8_t u8g_com_arduino_hw_spi_fn(u8g_t *u8g, uint8_t msg, uint8_t arg_val, void *arg_ptr)
|
|
|
|
{
|
|
|
|
return 1;
|
|
|
|
}
|
|
|
|
|
|
|
|
#endif /* ARDUINO */
|
|
|
|
|