iforce2d Chris / Mbed 2 deprecated ubxDistanceMeter

Displays distance to start location on OLED screen.

Dependencies:   mbed

u8g_com_arduino_hw_spi.c@0:972874f31c98, 2018-03-07 (annotated)

Committer:
iforce2d
Date:
Wed Mar 07 12:49:14 2018 +0000
Revision:
0:972874f31c98
First commit

Who changed what in which revision?

UserRevisionLine numberNew contents of line
iforce2d 0:972874f31c98 1 /*
iforce2d 0:972874f31c98 2
iforce2d 0:972874f31c98 3 u8g_com_arduino_hw_spi.c
iforce2d 0:972874f31c98 4
iforce2d 0:972874f31c98 5 Universal 8bit Graphics Library
iforce2d 0:972874f31c98 6
iforce2d 0:972874f31c98 7 Copyright (c) 2011, olikraus@gmail.com
iforce2d 0:972874f31c98 8 All rights reserved.
iforce2d 0:972874f31c98 9
iforce2d 0:972874f31c98 10 Redistribution and use in source and binary forms, with or without modification,
iforce2d 0:972874f31c98 11 are permitted provided that the following conditions are met:
iforce2d 0:972874f31c98 12
iforce2d 0:972874f31c98 13 * Redistributions of source code must retain the above copyright notice, this list
iforce2d 0:972874f31c98 14 of conditions and the following disclaimer.
iforce2d 0:972874f31c98 15
iforce2d 0:972874f31c98 16 * Redistributions in binary form must reproduce the above copyright notice, this
iforce2d 0:972874f31c98 17 list of conditions and the following disclaimer in the documentation and/or other
iforce2d 0:972874f31c98 18 materials provided with the distribution.
iforce2d 0:972874f31c98 19
iforce2d 0:972874f31c98 20 THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND
iforce2d 0:972874f31c98 21 CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES,
iforce2d 0:972874f31c98 22 INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
iforce2d 0:972874f31c98 23 MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
iforce2d 0:972874f31c98 24 DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR
iforce2d 0:972874f31c98 25 CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
iforce2d 0:972874f31c98 26 SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
iforce2d 0:972874f31c98 27 NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
iforce2d 0:972874f31c98 28 LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
iforce2d 0:972874f31c98 29 CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
iforce2d 0:972874f31c98 30 STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
iforce2d 0:972874f31c98 31 ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
iforce2d 0:972874f31c98 32 ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
iforce2d 0:972874f31c98 33
iforce2d 0:972874f31c98 34 SPI Clock Cycle Type
iforce2d 0:972874f31c98 35
iforce2d 0:972874f31c98 36 SSD1351 50ns 20 MHz
iforce2d 0:972874f31c98 37 SSD1322 300ns 3.3 MHz
iforce2d 0:972874f31c98 38 SSD1327 300ns
iforce2d 0:972874f31c98 39 SSD1306 300ns
iforce2d 0:972874f31c98 40 ST7565 400ns 2.5 MHz
iforce2d 0:972874f31c98 41 ST7920 400ns
iforce2d 0:972874f31c98 42
iforce2d 0:972874f31c98 43 Arduino DUE
iforce2d 0:972874f31c98 44
iforce2d 0:972874f31c98 45 PA25 MISO
iforce2d 0:972874f31c98 46 PA26 MOSI 75
iforce2d 0:972874f31c98 47 PA27 SCLK 76
iforce2d 0:972874f31c98 48
iforce2d 0:972874f31c98 49
iforce2d 0:972874f31c98 50 typedef struct {
iforce2d 0:972874f31c98 51 WoReg SPI_CR; (Spi Offset: 0x00) Control Register
iforce2d 0:972874f31c98 52 RwReg SPI_MR; (Spi Offset: 0x04) Mode Register
iforce2d 0:972874f31c98 53 RoReg SPI_RDR; (Spi Offset: 0x08) Receive Data Register
iforce2d 0:972874f31c98 54 WoReg SPI_TDR; (Spi Offset: 0x0C) Transmit Data Register
iforce2d 0:972874f31c98 55 RoReg SPI_SR; (Spi Offset: 0x10) Status Register
iforce2d 0:972874f31c98 56 WoReg SPI_IER; (Spi Offset: 0x14) Interrupt Enable Register
iforce2d 0:972874f31c98 57 WoReg SPI_IDR; (Spi Offset: 0x18) Interrupt Disable Register
iforce2d 0:972874f31c98 58 RoReg SPI_IMR; (Spi Offset: 0x1C) Interrupt Mask Register
iforce2d 0:972874f31c98 59 RoReg Reserved1[4];
iforce2d 0:972874f31c98 60 RwReg SPI_CSR[4]; (Spi Offset: 0x30) Chip Select Register
iforce2d 0:972874f31c98 61 RoReg Reserved2[41];
iforce2d 0:972874f31c98 62 RwReg SPI_WPMR; (Spi Offset: 0xE4) Write Protection Control Register
iforce2d 0:972874f31c98 63 RoReg SPI_WPSR; (Spi Offset: 0xE8) Write Protection Status Register
iforce2d 0:972874f31c98 64 } Spi;
iforce2d 0:972874f31c98 65
iforce2d 0:972874f31c98 66 Power Management Controller (PMC)
iforce2d 0:972874f31c98 67 arduino-1.5.2/hardware/arduino/sam/system/CMSIS/Device/ATMEL/sam3xa/include/instance/instance_pmc.h
iforce2d 0:972874f31c98 68 - enable PIO
iforce2d 0:972874f31c98 69
iforce2d 0:972874f31c98 70 REG_PMC_PCER0 = 1UL << ID_PIOA
iforce2d 0:972874f31c98 71 - enable SPI
iforce2d 0:972874f31c98 72 REG_PMC_PCER0 = 1UL << ID_SPI0
iforce2d 0:972874f31c98 73
iforce2d 0:972874f31c98 74
iforce2d 0:972874f31c98 75 - enable PIOA and SPI0
iforce2d 0:972874f31c98 76 REG_PMC_PCER0 = (1UL << ID_PIOA) | (1UL << ID_SPI0);
iforce2d 0:972874f31c98 77
iforce2d 0:972874f31c98 78 Parallel Input/Output Controller (PIO)
iforce2d 0:972874f31c98 79 arduino-1.5.2/hardware/arduino/sam/system/CMSIS/Device/ATMEL/sam3xa/include/instance/instance_pioa.h
iforce2d 0:972874f31c98 80 - enable special function of the pin: disable PIO on A26 and A27:
iforce2d 0:972874f31c98 81 REG_PIOA_PDR = 0x0c000000
iforce2d 0:972874f31c98 82 PIOA->PIO_PDR = 0x0c000000
iforce2d 0:972874f31c98 83
iforce2d 0:972874f31c98 84 SPI
iforce2d 0:972874f31c98 85 SPI0->SPI_CR = SPI_CR_SPIDIS
iforce2d 0:972874f31c98 86 SPI0->SPI_CR = SPI_CR_SWRST ;
iforce2d 0:972874f31c98 87 SPI0->SPI_CR = SPI_CR_SWRST ;
iforce2d 0:972874f31c98 88 SPI0->SPI_CR = SPI_CR_SPIEN
iforce2d 0:972874f31c98 89
iforce2d 0:972874f31c98 90 Bit 0: Master Mode = 1 (active)
iforce2d 0:972874f31c98 91 Bit 1: Peripheral Select = 0 (fixed)
iforce2d 0:972874f31c98 92 Bit 2: Chip Select Decode Mode = 1 (4 to 16)
iforce2d 0:972874f31c98 93 Bit 4: Mode Fault Detection = 1 (disabled)
iforce2d 0:972874f31c98 94 Bit 5: Wait Data Read = 0 (disabled)
iforce2d 0:972874f31c98 95 Bit 7: Loop Back Mode = 0 (disabled)
iforce2d 0:972874f31c98 96 Bit 16-19: Peripheral Chip Select = 0 (chip select 0)
iforce2d 0:972874f31c98 97 SPI0->SPI_MR = SPI_MR_MSTR | SPI_MR_PCSDEC | SPI_MR_MODFDIS
iforce2d 0:972874f31c98 98
iforce2d 0:972874f31c98 99 Bit 0: Clock Polarity = 0
iforce2d 0:972874f31c98 100 Bit 1: Clock Phase = 0
iforce2d 0:972874f31c98 101 Bit 4-7: Bits = 0 (8 Bit)
iforce2d 0:972874f31c98 102 Bit 8-15: SCBR = 1
iforce2d 0:972874f31c98 103 SPI0->SPI_CSR[0] = SPI_CSR_SCBR(x) Serial Baud Rate
iforce2d 0:972874f31c98 104 SCBR / 84000000 > 50 / 1000000000
iforce2d 0:972874f31c98 105 SCBR / 84 > 5 / 100
iforce2d 0:972874f31c98 106 SCBR > 50 *84 / 1000 --> SCBR=5
iforce2d 0:972874f31c98 107 SCBR > 300*84 / 1000 --> SCBR=26
iforce2d 0:972874f31c98 108 SCBR > 400*84 / 1000 --> SCBR=34
iforce2d 0:972874f31c98 109
iforce2d 0:972874f31c98 110 Arduino Due test code:
iforce2d 0:972874f31c98 111 REG_PMC_PCER0 = (1UL << ID_PIOA) | (1UL << ID_SPI0);
iforce2d 0:972874f31c98 112 REG_PIOA_PDR = 0x0c000000;
iforce2d 0:972874f31c98 113 SPI0->SPI_CR = SPI_CR_SPIDIS;
iforce2d 0:972874f31c98 114 SPI0->SPI_CR = SPI_CR_SWRST;
iforce2d 0:972874f31c98 115 SPI0->SPI_CR = SPI_CR_SWRST;
iforce2d 0:972874f31c98 116 SPI0->SPI_CR = SPI_CR_SPIEN;
iforce2d 0:972874f31c98 117 SPI0->SPI_MR = SPI_MR_MSTR | SPI_MR_PCSDEC | SPI_MR_MODFDIS;
iforce2d 0:972874f31c98 118 SPI0->SPI_CSR[0] = SPI_CSR_SCBR(30);
iforce2d 0:972874f31c98 119
iforce2d 0:972874f31c98 120 for(;;)
iforce2d 0:972874f31c98 121 {
iforce2d 0:972874f31c98 122 while( (SPI0->SPI_SR & SPI_SR_TDRE) == 0 )
iforce2d 0:972874f31c98 123 ;
iforce2d 0:972874f31c98 124 SPI0->SPI_TDR = 0x050;
iforce2d 0:972874f31c98 125 }
iforce2d 0:972874f31c98 126
iforce2d 0:972874f31c98 127 */
iforce2d 0:972874f31c98 128
iforce2d 0:972874f31c98 129 #include "u8g.h"
iforce2d 0:972874f31c98 130
iforce2d 0:972874f31c98 131 #if defined(ARDUINO)
iforce2d 0:972874f31c98 132
iforce2d 0:972874f31c98 133 #if defined(__AVR__)
iforce2d 0:972874f31c98 134 #define U8G_ARDUINO_ATMEGA_HW_SPI
iforce2d 0:972874f31c98 135 /* remove the definition for attiny */
iforce2d 0:972874f31c98 136 #if __AVR_ARCH__ == 2
iforce2d 0:972874f31c98 137 #undef U8G_ARDUINO_ATMEGA_HW_SPI
iforce2d 0:972874f31c98 138 #endif
iforce2d 0:972874f31c98 139 #if __AVR_ARCH__ == 25
iforce2d 0:972874f31c98 140 #undef U8G_ARDUINO_ATMEGA_HW_SPI
iforce2d 0:972874f31c98 141 #endif
iforce2d 0:972874f31c98 142 #endif
iforce2d 0:972874f31c98 143
iforce2d 0:972874f31c98 144 #if defined(U8G_ARDUINO_ATMEGA_HW_SPI)
iforce2d 0:972874f31c98 145
iforce2d 0:972874f31c98 146 #include <avr/interrupt.h>
iforce2d 0:972874f31c98 147 #include <avr/io.h>
iforce2d 0:972874f31c98 148
iforce2d 0:972874f31c98 149 #if ARDUINO < 100
iforce2d 0:972874f31c98 150 #include <WProgram.h>
iforce2d 0:972874f31c98 151
iforce2d 0:972874f31c98 152 /* fixed pins */
iforce2d 0:972874f31c98 153 #if defined(__AVR_ATmega644P__) || defined(__AVR_ATmega1284P__) // Sanguino.cc board
iforce2d 0:972874f31c98 154 #define PIN_SCK 7
iforce2d 0:972874f31c98 155 #define PIN_MISO 6
iforce2d 0:972874f31c98 156 #define PIN_MOSI 5
iforce2d 0:972874f31c98 157 #define PIN_CS 4
iforce2d 0:972874f31c98 158 #else // Arduino Board
iforce2d 0:972874f31c98 159 #define PIN_SCK 13
iforce2d 0:972874f31c98 160 #define PIN_MISO 12
iforce2d 0:972874f31c98 161 #define PIN_MOSI 11
iforce2d 0:972874f31c98 162 #define PIN_CS 10
iforce2d 0:972874f31c98 163 #endif // (__AVR_ATmega644P__) || defined(__AVR_ATmega1284P__)
iforce2d 0:972874f31c98 164
iforce2d 0:972874f31c98 165 #else
iforce2d 0:972874f31c98 166
iforce2d 0:972874f31c98 167 #include <Arduino.h>
iforce2d 0:972874f31c98 168
iforce2d 0:972874f31c98 169 /* use Arduino pin definitions */
iforce2d 0:972874f31c98 170 #define PIN_SCK SCK
iforce2d 0:972874f31c98 171 #define PIN_MISO MISO
iforce2d 0:972874f31c98 172 #define PIN_MOSI MOSI
iforce2d 0:972874f31c98 173 #define PIN_CS SS
iforce2d 0:972874f31c98 174
iforce2d 0:972874f31c98 175 #endif
iforce2d 0:972874f31c98 176
iforce2d 0:972874f31c98 177
iforce2d 0:972874f31c98 178
iforce2d 0:972874f31c98 179 //static uint8_t u8g_spi_out(uint8_t data) U8G_NOINLINE;
iforce2d 0:972874f31c98 180 static uint8_t u8g_spi_out(uint8_t data)
iforce2d 0:972874f31c98 181 {
iforce2d 0:972874f31c98 182 /* unsigned char x = 100; */
iforce2d 0:972874f31c98 183 /* send data */
iforce2d 0:972874f31c98 184 SPDR = data;
iforce2d 0:972874f31c98 185 /* wait for transmission */
iforce2d 0:972874f31c98 186 while (!(SPSR & (1<<SPIF)))
iforce2d 0:972874f31c98 187 ;
iforce2d 0:972874f31c98 188 /* clear the SPIF flag by reading SPDR */
iforce2d 0:972874f31c98 189 return SPDR;
iforce2d 0:972874f31c98 190 }
iforce2d 0:972874f31c98 191
iforce2d 0:972874f31c98 192
iforce2d 0:972874f31c98 193 uint8_t u8g_com_arduino_hw_spi_fn(u8g_t *u8g, uint8_t msg, uint8_t arg_val, void *arg_ptr)
iforce2d 0:972874f31c98 194 {
iforce2d 0:972874f31c98 195 switch(msg)
iforce2d 0:972874f31c98 196 {
iforce2d 0:972874f31c98 197 case U8G_COM_MSG_STOP:
iforce2d 0:972874f31c98 198 break;
iforce2d 0:972874f31c98 199
iforce2d 0:972874f31c98 200 case U8G_COM_MSG_INIT:
iforce2d 0:972874f31c98 201 u8g_com_arduino_assign_pin_output_high(u8g);
iforce2d 0:972874f31c98 202 pinMode(PIN_SCK, OUTPUT);
iforce2d 0:972874f31c98 203 digitalWrite(PIN_SCK, LOW);
iforce2d 0:972874f31c98 204 pinMode(PIN_MOSI, OUTPUT);
iforce2d 0:972874f31c98 205 digitalWrite(PIN_MOSI, LOW);
iforce2d 0:972874f31c98 206 /* pinMode(PIN_MISO, INPUT); */
iforce2d 0:972874f31c98 207
iforce2d 0:972874f31c98 208 pinMode(PIN_CS, OUTPUT); /* system chip select for the atmega board */
iforce2d 0:972874f31c98 209 digitalWrite(PIN_CS, HIGH);
iforce2d 0:972874f31c98 210
iforce2d 0:972874f31c98 211
iforce2d 0:972874f31c98 212
iforce2d 0:972874f31c98 213 /*
iforce2d 0:972874f31c98 214 SPR1 SPR0
iforce2d 0:972874f31c98 215 0 0 fclk/4
iforce2d 0:972874f31c98 216 0 1 fclk/16
iforce2d 0:972874f31c98 217 1 0 fclk/64
iforce2d 0:972874f31c98 218 1 1 fclk/128
iforce2d 0:972874f31c98 219 */
iforce2d 0:972874f31c98 220 SPCR = 0;
iforce2d 0:972874f31c98 221 SPCR = (1<<SPE) | (1<<MSTR)|(0<<SPR1)|(0<<SPR0)|(0<<CPOL)|(0<<CPHA);
iforce2d 0:972874f31c98 222 #ifdef U8G_HW_SPI_2X
iforce2d 0:972874f31c98 223 SPSR = (1 << SPI2X); /* double speed, issue 89 */
iforce2d 0:972874f31c98 224 #else
iforce2d 0:972874f31c98 225 if ( arg_val <= U8G_SPI_CLK_CYCLE_50NS )
iforce2d 0:972874f31c98 226 {
iforce2d 0:972874f31c98 227 SPSR = (1 << SPI2X); /* double speed, issue 89 */
iforce2d 0:972874f31c98 228 }
iforce2d 0:972874f31c98 229 #endif
iforce2d 0:972874f31c98 230
iforce2d 0:972874f31c98 231
iforce2d 0:972874f31c98 232 break;
iforce2d 0:972874f31c98 233
iforce2d 0:972874f31c98 234 case U8G_COM_MSG_ADDRESS: /* define cmd (arg_val = 0) or data mode (arg_val = 1) */
iforce2d 0:972874f31c98 235 u8g_com_arduino_digital_write(u8g, U8G_PI_A0, arg_val);
iforce2d 0:972874f31c98 236 break;
iforce2d 0:972874f31c98 237
iforce2d 0:972874f31c98 238 case U8G_COM_MSG_CHIP_SELECT:
iforce2d 0:972874f31c98 239 if ( arg_val == 0 )
iforce2d 0:972874f31c98 240 {
iforce2d 0:972874f31c98 241 /* disable */
iforce2d 0:972874f31c98 242 u8g_com_arduino_digital_write(u8g, U8G_PI_CS, HIGH);
iforce2d 0:972874f31c98 243 }
iforce2d 0:972874f31c98 244 else
iforce2d 0:972874f31c98 245 {
iforce2d 0:972874f31c98 246 /* enable */
iforce2d 0:972874f31c98 247 u8g_com_arduino_digital_write(u8g, U8G_PI_SCK, LOW);
iforce2d 0:972874f31c98 248 u8g_com_arduino_digital_write(u8g, U8G_PI_CS, LOW);
iforce2d 0:972874f31c98 249 }
iforce2d 0:972874f31c98 250 break;
iforce2d 0:972874f31c98 251
iforce2d 0:972874f31c98 252 case U8G_COM_MSG_RESET:
iforce2d 0:972874f31c98 253 if ( u8g->pin_list[U8G_PI_RESET] != U8G_PIN_NONE )
iforce2d 0:972874f31c98 254 u8g_com_arduino_digital_write(u8g, U8G_PI_RESET, arg_val);
iforce2d 0:972874f31c98 255 break;
iforce2d 0:972874f31c98 256
iforce2d 0:972874f31c98 257 case U8G_COM_MSG_WRITE_BYTE:
iforce2d 0:972874f31c98 258 u8g_spi_out(arg_val);
iforce2d 0:972874f31c98 259 break;
iforce2d 0:972874f31c98 260
iforce2d 0:972874f31c98 261 case U8G_COM_MSG_WRITE_SEQ:
iforce2d 0:972874f31c98 262 {
iforce2d 0:972874f31c98 263 register uint8_t *ptr = arg_ptr;
iforce2d 0:972874f31c98 264 while( arg_val > 0 )
iforce2d 0:972874f31c98 265 {
iforce2d 0:972874f31c98 266 u8g_spi_out(*ptr++);
iforce2d 0:972874f31c98 267 arg_val--;
iforce2d 0:972874f31c98 268 }
iforce2d 0:972874f31c98 269 }
iforce2d 0:972874f31c98 270 break;
iforce2d 0:972874f31c98 271 case U8G_COM_MSG_WRITE_SEQ_P:
iforce2d 0:972874f31c98 272 {
iforce2d 0:972874f31c98 273 register uint8_t *ptr = arg_ptr;
iforce2d 0:972874f31c98 274 while( arg_val > 0 )
iforce2d 0:972874f31c98 275 {
iforce2d 0:972874f31c98 276 u8g_spi_out(u8g_pgm_read(ptr));
iforce2d 0:972874f31c98 277 ptr++;
iforce2d 0:972874f31c98 278 arg_val--;
iforce2d 0:972874f31c98 279 }
iforce2d 0:972874f31c98 280 }
iforce2d 0:972874f31c98 281 break;
iforce2d 0:972874f31c98 282 }
iforce2d 0:972874f31c98 283 return 1;
iforce2d 0:972874f31c98 284 }
iforce2d 0:972874f31c98 285
iforce2d 0:972874f31c98 286 /* #elif defined(__18CXX) || defined(__PIC32MX) */
iforce2d 0:972874f31c98 287
iforce2d 0:972874f31c98 288 #elif defined(__arm__) // Arduino Due, maybe we should better check for __SAM3X8E__
iforce2d 0:972874f31c98 289
iforce2d 0:972874f31c98 290 #include <Arduino.h>
iforce2d 0:972874f31c98 291
iforce2d 0:972874f31c98 292 /* use Arduino pin definitions */
iforce2d 0:972874f31c98 293 #define PIN_SCK SCK
iforce2d 0:972874f31c98 294 #define PIN_MISO MISO
iforce2d 0:972874f31c98 295 #define PIN_MOSI MOSI
iforce2d 0:972874f31c98 296 #define PIN_CS SS
iforce2d 0:972874f31c98 297
iforce2d 0:972874f31c98 298
iforce2d 0:972874f31c98 299 static uint8_t u8g_spi_out(uint8_t data)
iforce2d 0:972874f31c98 300 {
iforce2d 0:972874f31c98 301 /* wait until tx register is empty */
iforce2d 0:972874f31c98 302 while( (SPI0->SPI_SR & SPI_SR_TDRE) == 0 )
iforce2d 0:972874f31c98 303 ;
iforce2d 0:972874f31c98 304 /* send data */
iforce2d 0:972874f31c98 305 SPI0->SPI_TDR = (uint32_t)data;
iforce2d 0:972874f31c98 306 return data;
iforce2d 0:972874f31c98 307 }
iforce2d 0:972874f31c98 308
iforce2d 0:972874f31c98 309
iforce2d 0:972874f31c98 310 uint8_t u8g_com_arduino_hw_spi_fn(u8g_t *u8g, uint8_t msg, uint8_t arg_val, void *arg_ptr)
iforce2d 0:972874f31c98 311 {
iforce2d 0:972874f31c98 312 switch(msg)
iforce2d 0:972874f31c98 313 {
iforce2d 0:972874f31c98 314 case U8G_COM_MSG_STOP:
iforce2d 0:972874f31c98 315 break;
iforce2d 0:972874f31c98 316
iforce2d 0:972874f31c98 317 case U8G_COM_MSG_INIT:
iforce2d 0:972874f31c98 318 u8g_com_arduino_assign_pin_output_high(u8g);
iforce2d 0:972874f31c98 319 u8g_com_arduino_digital_write(u8g, U8G_PI_CS, HIGH);
iforce2d 0:972874f31c98 320
iforce2d 0:972874f31c98 321 /* Arduino Due specific code */
iforce2d 0:972874f31c98 322
iforce2d 0:972874f31c98 323 /* enable PIOA and SPI0 */
iforce2d 0:972874f31c98 324 REG_PMC_PCER0 = (1UL << ID_PIOA) | (1UL << ID_SPI0);
iforce2d 0:972874f31c98 325
iforce2d 0:972874f31c98 326 /* disable PIO on A26 and A27 */
iforce2d 0:972874f31c98 327 REG_PIOA_PDR = 0x0c000000;
iforce2d 0:972874f31c98 328
iforce2d 0:972874f31c98 329 /* reset SPI0 (from sam lib) */
iforce2d 0:972874f31c98 330 SPI0->SPI_CR = SPI_CR_SPIDIS;
iforce2d 0:972874f31c98 331 SPI0->SPI_CR = SPI_CR_SWRST;
iforce2d 0:972874f31c98 332 SPI0->SPI_CR = SPI_CR_SWRST;
iforce2d 0:972874f31c98 333 SPI0->SPI_CR = SPI_CR_SPIEN;
iforce2d 0:972874f31c98 334 u8g_MicroDelay();
iforce2d 0:972874f31c98 335
iforce2d 0:972874f31c98 336 /* master mode, no fault detection, chip select 0 */
iforce2d 0:972874f31c98 337 SPI0->SPI_MR = SPI_MR_MSTR | SPI_MR_PCSDEC | SPI_MR_MODFDIS;
iforce2d 0:972874f31c98 338
iforce2d 0:972874f31c98 339 /* Polarity, Phase, 8 Bit data transfer, baud rate */
iforce2d 0:972874f31c98 340 /* x * 1000 / 84 --> clock cycle in ns
iforce2d 0:972874f31c98 341 5 * 1000 / 84 = 58 ns
iforce2d 0:972874f31c98 342 SCBR > 50 *84 / 1000 --> SCBR=5
iforce2d 0:972874f31c98 343 SCBR > 300*84 / 1000 --> SCBR=26
iforce2d 0:972874f31c98 344 SCBR > 400*84 / 1000 --> SCBR=34
iforce2d 0:972874f31c98 345 */
iforce2d 0:972874f31c98 346
iforce2d 0:972874f31c98 347 if ( arg_val <= U8G_SPI_CLK_CYCLE_50NS )
iforce2d 0:972874f31c98 348 {
iforce2d 0:972874f31c98 349 SPI0->SPI_CSR[0] = SPI_CSR_SCBR(5) | 1;
iforce2d 0:972874f31c98 350 }
iforce2d 0:972874f31c98 351 else if ( arg_val <= U8G_SPI_CLK_CYCLE_300NS )
iforce2d 0:972874f31c98 352 {
iforce2d 0:972874f31c98 353 SPI0->SPI_CSR[0] = SPI_CSR_SCBR(26) | 1;
iforce2d 0:972874f31c98 354 }
iforce2d 0:972874f31c98 355 else if ( arg_val <= U8G_SPI_CLK_CYCLE_400NS )
iforce2d 0:972874f31c98 356 {
iforce2d 0:972874f31c98 357 SPI0->SPI_CSR[0] = SPI_CSR_SCBR(34) | 1;
iforce2d 0:972874f31c98 358 }
iforce2d 0:972874f31c98 359 else
iforce2d 0:972874f31c98 360 {
iforce2d 0:972874f31c98 361 SPI0->SPI_CSR[0] = SPI_CSR_SCBR(84) | 1;
iforce2d 0:972874f31c98 362 }
iforce2d 0:972874f31c98 363
iforce2d 0:972874f31c98 364 u8g_MicroDelay();
iforce2d 0:972874f31c98 365 break;
iforce2d 0:972874f31c98 366
iforce2d 0:972874f31c98 367 case U8G_COM_MSG_ADDRESS: /* define cmd (arg_val = 0) or data mode (arg_val = 1) */
iforce2d 0:972874f31c98 368 u8g_com_arduino_digital_write(u8g, U8G_PI_A0, arg_val);
iforce2d 0:972874f31c98 369 u8g_MicroDelay();
iforce2d 0:972874f31c98 370 break;
iforce2d 0:972874f31c98 371
iforce2d 0:972874f31c98 372 case U8G_COM_MSG_CHIP_SELECT:
iforce2d 0:972874f31c98 373 if ( arg_val == 0 )
iforce2d 0:972874f31c98 374 {
iforce2d 0:972874f31c98 375 /* disable */
iforce2d 0:972874f31c98 376 u8g_MicroDelay(); /* this delay is required to avoid that the display is switched off too early --> DOGS102 with DUE */
iforce2d 0:972874f31c98 377 u8g_com_arduino_digital_write(u8g, U8G_PI_CS, HIGH);
iforce2d 0:972874f31c98 378 u8g_MicroDelay();
iforce2d 0:972874f31c98 379 }
iforce2d 0:972874f31c98 380 else
iforce2d 0:972874f31c98 381 {
iforce2d 0:972874f31c98 382 /* enable */
iforce2d 0:972874f31c98 383 //u8g_com_arduino_digital_write(u8g, U8G_PI_SCK, LOW);
iforce2d 0:972874f31c98 384 u8g_com_arduino_digital_write(u8g, U8G_PI_CS, LOW);
iforce2d 0:972874f31c98 385 u8g_MicroDelay();
iforce2d 0:972874f31c98 386 }
iforce2d 0:972874f31c98 387 break;
iforce2d 0:972874f31c98 388
iforce2d 0:972874f31c98 389 case U8G_COM_MSG_RESET:
iforce2d 0:972874f31c98 390 if ( u8g->pin_list[U8G_PI_RESET] != U8G_PIN_NONE )
iforce2d 0:972874f31c98 391 u8g_com_arduino_digital_write(u8g, U8G_PI_RESET, arg_val);
iforce2d 0:972874f31c98 392 break;
iforce2d 0:972874f31c98 393
iforce2d 0:972874f31c98 394 case U8G_COM_MSG_WRITE_BYTE:
iforce2d 0:972874f31c98 395 u8g_spi_out(arg_val);
iforce2d 0:972874f31c98 396 u8g_MicroDelay();
iforce2d 0:972874f31c98 397 break;
iforce2d 0:972874f31c98 398
iforce2d 0:972874f31c98 399 case U8G_COM_MSG_WRITE_SEQ:
iforce2d 0:972874f31c98 400 {
iforce2d 0:972874f31c98 401 register uint8_t *ptr = arg_ptr;
iforce2d 0:972874f31c98 402 while( arg_val > 0 )
iforce2d 0:972874f31c98 403 {
iforce2d 0:972874f31c98 404 u8g_spi_out(*ptr++);
iforce2d 0:972874f31c98 405 arg_val--;
iforce2d 0:972874f31c98 406 }
iforce2d 0:972874f31c98 407 }
iforce2d 0:972874f31c98 408 break;
iforce2d 0:972874f31c98 409 case U8G_COM_MSG_WRITE_SEQ_P:
iforce2d 0:972874f31c98 410 {
iforce2d 0:972874f31c98 411 register uint8_t *ptr = arg_ptr;
iforce2d 0:972874f31c98 412 while( arg_val > 0 )
iforce2d 0:972874f31c98 413 {
iforce2d 0:972874f31c98 414 u8g_spi_out(u8g_pgm_read(ptr));
iforce2d 0:972874f31c98 415 ptr++;
iforce2d 0:972874f31c98 416 arg_val--;
iforce2d 0:972874f31c98 417 }
iforce2d 0:972874f31c98 418 }
iforce2d 0:972874f31c98 419 break;
iforce2d 0:972874f31c98 420 }
iforce2d 0:972874f31c98 421 return 1;
iforce2d 0:972874f31c98 422 }
iforce2d 0:972874f31c98 423
iforce2d 0:972874f31c98 424
iforce2d 0:972874f31c98 425
iforce2d 0:972874f31c98 426 #else /* U8G_ARDUINO_ATMEGA_HW_SPI */
iforce2d 0:972874f31c98 427
iforce2d 0:972874f31c98 428 #endif /* U8G_ARDUINO_ATMEGA_HW_SPI */
iforce2d 0:972874f31c98 429
iforce2d 0:972874f31c98 430 #else /* ARDUINO */
iforce2d 0:972874f31c98 431
iforce2d 0:972874f31c98 432 uint8_t u8g_com_arduino_hw_spi_fn(u8g_t *u8g, uint8_t msg, uint8_t arg_val, void *arg_ptr)
iforce2d 0:972874f31c98 433 {
iforce2d 0:972874f31c98 434 return 1;
iforce2d 0:972874f31c98 435 }
iforce2d 0:972874f31c98 436
iforce2d 0:972874f31c98 437 #endif /* ARDUINO */
iforce2d 0:972874f31c98 438
iforce2d 0:972874f31c98 439