Split SSD1306 spi board example into 2 files.

Revert chibios 3.x use of bool as a base type for bool_t. back to char
bool is available on c++ compilers only!!!!

1 files changed, 115 insertions, 0 deletions

diff --git a/boards/addons/gdisp/board_SSD1306_spi2.h b/boards/addons/gdisp/board_SSD1306_spi2.h
new file mode 100644
index 00000000..5b647578
--- /dev/null
+++ b/boards/addons/gdisp/board_SSD1306_spi2.h
@@ -0,0 +1,115 @@
+/*
+ * This file is subject to the terms of the GFX License. If a copy of
+ * the license was not distributed with this file, you can obtain one at:
+ *
+ *              http://ugfx.org/license.html
+ */
+
+/**
+ * @file    boards/addons/gdisp/board_SSD1306_spi.h
+ * @brief   GDISP Graphic Driver subsystem board interface for the SSD1306 display.
+ *
+ * @note	This file contains a mix of hardware specific and operating system specific
+ *			code. You will need to change it for your CPU and/or operating system.
+ */
+
+#ifndef _GDISP_LLD_BOARD_H
+#define _GDISP_LLD_BOARD_H
+
+// Pin & SPI setup
+
+#define SPI_DRIVER (&SPID2)
+#define SPI_PORT GPIOB
+#define SCK_PAD  13
+#define MISO_PAD 14
+#define MOSI_PAD 15
+
+#define CS_PORT     GPIOC
+#define RESET_PORT  GPIOC
+#define DNC_PORT    GPIOC
+#define CS_PAD     7        // 0 = chip selected
+#define RESET_PAD  8        // 0 = reset
+#define DNC_PAD    9        // control=0, data=1
+
+static SPIConfig spi_cfg = { NULL, CS_PORT, CS_PAD, 0 };
+
+static inline void init_board(GDisplay *g) {
+	(void) g;
+	g->board = 0; 
+	// Maximum speed of SSD1306 is 10Mhz, so set SPI speed less or = to that.  
+	//
+	// STM32 specific setup
+	// STM32_PCLK1 is APB1 frequence in hertz.
+	// STM32_PCLK2 is APB2 frequence in hertz.
+	// See manual clock diagram to determine APB1 or APB2 for spi in use. 
+	// SPI2 uses APB1 clock on stm32151
+	// BR bits divide PCLK as follows
+	// 000  /2   =   16 MHz
+	// 001  /4   =   8 MHz
+	// 010  /8   =   4 MHz
+	// 011  /16  =   2 MHz
+	// 100  /32  =   1 MHz
+	// 101  /64  =   500 kHz
+	// 110  /128 =   250 kHz
+	// 111  /256 =   125 kHz
+	unsigned long spi_clk = STM32_PCLK1 / 2;
+	unsigned code = 0;
+	while (spi_clk > 10000000) {
+		code++;
+		spi_clk /= 2;
+	}
+	spi_cfg.cr1 |= (code << 3);
+	
+	if (g->controllerdisplay == 0) {
+		palSetPadMode(SPI_PORT, SCK_PAD, PAL_MODE_ALTERNATE(5)|PAL_STM32_OTYPE_PUSHPULL|PAL_STM32_OSPEED_MID2);
+		palSetPadMode(SPI_PORT, MOSI_PAD, PAL_MODE_ALTERNATE(5)|PAL_STM32_OTYPE_PUSHPULL|PAL_STM32_OSPEED_MID2);
+		palSetPadMode(SPI_PORT, MISO_PAD, PAL_MODE_ALTERNATE(5));
+		palSetPadMode(RESET_PORT, RESET_PAD, PAL_MODE_OUTPUT_PUSHPULL);
+		palSetPadMode(CS_PORT, CS_PAD, PAL_MODE_OUTPUT_PUSHPULL);
+		palSetPadMode(DNC_PORT, DNC_PAD, PAL_MODE_OUTPUT_PUSHPULL);
+		palSetPad(CS_PORT, CS_PAD);
+		palSetPad(RESET_PORT, RESET_PAD);
+		palClearPad(DNC_PORT, DNC_PAD); 
+	}
+}
+
+static inline void post_init_board(GDisplay *g) {
+	(void) g;
+}
+
+
+static inline void setpin_reset(GDisplay *g, bool_t state) {
+	(void) g;
+	palWritePad(RESET_PORT, RESET_PAD, !state);
+}
+
+static inline void acquire_bus(GDisplay *g) {
+	(void) g;
+	spiAcquireBus(SPI_DRIVER);
+	spiStart(SPI_DRIVER, &spi_cfg); 
+	spiSelect(SPI_DRIVER);
+}
+
+static inline void release_bus(GDisplay *g) {
+	(void) g;
+	spiUnselect(SPI_DRIVER);
+	spiStop(SPI_DRIVER);
+	spiReleaseBus(SPI_DRIVER);
+}
+
+static inline void write_cmd(GDisplay *g, uint8_t cmd) {
+	(void) g;
+	static uint8_t buf;
+	palClearPad(DNC_PORT, DNC_PAD);
+	buf = cmd;
+	spiSend(SPI_DRIVER, 1, &buf);
+}
+
+static inline void write_data(GDisplay *g, uint8_t* data, uint16_t length) {
+	(void) g;
+	palSetPad(DNC_PORT, DNC_PAD);
+	spiSend(SPI_DRIVER, length, data);
+}
+
+
+#endif /* _GDISP_LLD_BOARD_H */