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