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- /*
-
- 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 <avr/interrupt.h>
- #include <avr/io.h>
-
- #if ARDUINO < 100
- #include <WProgram.h>
-
- /* 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 <Arduino.h>
-
- /* 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<<SPIF)))
- ;
- /* clear the SPIF flag by reading SPDR */
- return SPDR;
- }
-
-
- 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);
- pinMode(PIN_SCK, OUTPUT);
- digitalWrite(PIN_SCK, LOW);
- pinMode(PIN_MOSI, OUTPUT);
- digitalWrite(PIN_MOSI, LOW);
- /* pinMode(PIN_MISO, INPUT); */
-
- pinMode(PIN_CS, OUTPUT); /* system chip select for the atmega board */
- digitalWrite(PIN_CS, HIGH);
-
-
-
- /*
- SPR1 SPR0
- 0 0 fclk/4
- 0 1 fclk/16
- 1 0 fclk/64
- 1 1 fclk/128
- */
- SPCR = 0;
- SPCR = (1<<SPE) | (1<<MSTR)|(0<<SPR1)|(0<<SPR0)|(0<<CPOL)|(0<<CPHA);
- #ifdef U8G_HW_SPI_2X
- SPSR = (1 << SPI2X); /* double speed, issue 89 */
- #else
- if ( arg_val <= U8G_SPI_CLK_CYCLE_50NS )
- {
- SPSR = (1 << SPI2X); /* double speed, issue 89 */
- }
- #endif
-
-
- 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);
- break;
-
- case U8G_COM_MSG_CHIP_SELECT:
- if ( arg_val == 0 )
- {
- /* disable */
- u8g_com_arduino_digital_write(u8g, U8G_PI_CS, HIGH);
- }
- else
- {
- /* enable */
- u8g_com_arduino_digital_write(u8g, U8G_PI_SCK, LOW);
- u8g_com_arduino_digital_write(u8g, U8G_PI_CS, LOW);
- }
- 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);
- 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 <Arduino.h>
-
- /* 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 */
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