【Rico Board试用体验】8.Ricoboard开发板上SPI模拟与OLED显示

2016-12-12 09:45:23 4783 Matrix

0 在Ricoboard开发板上使能SPI0和SPI4的方法相信大家已经了解，我这里不在重复，因为使用正常的spi器件无法驱动手里的OLED模块，所以才想到使用GPIO模拟SPI的方法，理论不多说直接说实现步骤。 1.添加kernel编译支持。 2.选择合适的GPIO，这里直接使用SPI4的GPIO，如下图： 3.DTSI里面添加GPIO模拟SPI的设置 4.添加SPIDev测试驱动因为在config里面设置CONFIG_SPI_SPIDEV=y，无法编译出spidev设备节点，所以直接在Makefile里面修改obj-$(CONFIG_SPI_SPIDEV) += spidev.o为obj-y += spidev.o。 5.添加应用程序测试SPIDEV设备节点第一次和最后一次模拟处理的SPI的DO和D1是连接状态，中间一次是断开状态。测试结果如上图，pin连接如下图：上面的步骤就可以保证我们模拟处理的SPI是可以正常通讯的，下面说说如何实现OELD的显示步骤。因为目前本职工作较忙，所以只是简单说一下实现步骤，相信有经验的人参考一下就可以实现这个功能。 OELD是一种非常高大尚的显示技术，据说苹果下一代产品就要使用OLED做显示屏，不过目前的OLED价格有点贵。从技术上来讲实现难度并不大，只是可以参考的例子很少，在没有硬件支持的情况下自己将OLED点亮确实花费了一番功夫。 1.DTSI中OLED驱动加载 2.OLED接线方法 3.结果显示 4.驱动代码实现 #include #include #include #include #include #include #include titions.h> #include #include #include #define SSD1306_CMD 0 #define SSD1306_DAT 1 #define SSD1306_WIDTH 128 #define SSD1306_HEIGHT 64 static uint8_t s_chDispalyBuffer[128][8]; const uint8_t c_chFont1608[95][16] = { 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{0x00,0x00,0x01,0x04,0x01,0x8C,0x00,0x74,0x01,0x70,0x01,0x8C,0x01,0x04,0x00,0x00},/"x",88/ {0x01,0x01,0x01,0x81,0x01,0x71,0x00,0x0E,0x00,0x18,0x01,0x60,0x01,0x80,0x01,0x00},/"y",89/ {0x00,0x00,0x01,0x84,0x01,0x0C,0x01,0x34,0x01,0x44,0x01,0x84,0x01,0x0C,0x00,0x00},/"z",90/ {0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x01,0x00,0x3E,0xFC,0x40,0x02,0x40,0x02},/"{",91/ {0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0xFF,0xFF,0x00,0x00,0x00,0x00,0x00,0x00},/"\|",92/ {0x00,0x00,0x40,0x02,0x40,0x02,0x3E,0xFC,0x01,0x00,0x00,0x00,0x00,0x00,0x00,0x00},/"}",93/ {0x00,0x00,0x60,0x00,0x80,0x00,0x80,0x00,0x40,0x00,0x40,0x00,0x20,0x00,0x20,0x00},/"~",94/ }; struct spi_device spi_ssd1306_dev; static void ssd1306_write_byte(uint8_t chData, uint8_t chCmd) { struct spi_transfer t; struct spi_message m; uint16_t data = chData; memset(&t,0,sizeof(struct spi_transfer)); if (chCmd) { data \|= (1 << 8); } else { data &= ~(1 << 8); } t.tx_buf = &data; t.len = 2; t.bits_per_word = 9; //t.cs_change = 1; spi_message_init(&m); spi_message_add_tail(&t, &m); spi_sync(spi_ssd1306_dev, &m); } void ssd1306_display_on(void) { ssd1306_write_byte(0x8D, SSD1306_CMD); ssd1306_write_byte(0x14, SSD1306_CMD); ssd1306_write_byte(0xAF, SSD1306_CMD); } /** * @brief OLED turns off * * @param None * * @retval None / void ssd1306_display_off(void) { ssd1306_write_byte(0x8D, SSD1306_CMD); ssd1306_write_byte(0x10, SSD1306_CMD); ssd1306_write_byte(0xAE, SSD1306_CMD); } void ssd1306_refresh_gram(void) { uint8_t i, j; for (i = 0; i < 8; i ++) { ssd1306_write_byte(0xB0 + i, SSD1306_CMD); ssd1306_write_byte(0x02, SSD1306_CMD); ssd1306_write_byte(0x10, SSD1306_CMD); for (j = 0; j < 128; j ++) { ssd1306_write_byte(s_chDispalyBuffer[j][i], SSD1306_DAT); } } } void ssd1306_clear_screen(uint8_t chFill) { memset(s_chDispalyBuffer,chFill, sizeof(s_chDispalyBuffer)); ssd1306_refresh_gram(); } / * @brief Draws a piont on the screen * * @param chXpos: Specifies the X position * @param chYpos: Specifies the Y position * @param chPoint: 0: the point turns off 1: the piont turns on * * @retval None / void ssd1306_draw_point(uint8_t chXpos, uint8_t chYpos, uint8_t chPoint) { uint8_t chPos, chBx, chTemp = 0; if (chXpos > 127 \|\| chYpos > 63) { return; } chPos = 7 - chYpos / 8; // chBx = chYpos % 8; chTemp = 1 << (7 - chBx); if (chPoint) { s_chDispalyBuffer[chXpos][chPos] \|= chTemp; } else { s_chDispalyBuffer[chXpos][chPos] &= ~chTemp; } } / * @brief Fills a rectangle * * @param chXpos1: Specifies the X position 1 (X top left position) * @param chYpos1: Specifies the Y position 1 (Y top left position) * @param chXpos2: Specifies the X position 2 (X bottom right position) * @param chYpos3: Specifies the Y position 2 (Y bottom right position) * * @retval / void ssd1306_fill_screen(uint8_t chXpos1, uint8_t chYpos1, uint8_t chXpos2, uint8_t chYpos2, uint8_t chDot) { uint8_t chXpos, chYpos; for (chXpos = chXpos1; chXpos <= chXpos2; chXpos ++) { for (chYpos = chYpos1; chYpos <= chYpos2; chYpos ++) { ssd1306_draw_point(chXpos, chYpos, chDot); } } ssd1306_refresh_gram(); } / * @brief Displays one character at the specified position * * @param chXpos: Specifies the X position * @param chYpos: Specifies the Y position * @param chSize: * @param chMode * @retval / void ssd1306_display_char(uint8_t chXpos, uint8_t chYpos, uint8_t chChr, uint8_t chSize, uint8_t chMode) { uint8_t i, j; uint8_t chTemp, chYpos0 = chYpos; chChr = chChr - ' '; for (i = 0; i < chSize; i ++) { if (chMode) { chTemp = c_chFont1608[chChr][i]; } else { chTemp = ~c_chFont1608[chChr][i]; } for (j = 0; j < 8; j ++) { if (chTemp & 0x80) { ssd1306_draw_point(chXpos, chYpos, 1); } else { ssd1306_draw_point(chXpos, chYpos, 0); } chTemp <<= 1; chYpos ++; if ((chYpos - chYpos0) == chSize) { chYpos = chYpos0; chXpos ++; break; } } } } / * @brief Displays a string on the screen * * @param chXpos: Specifies the X position * @param chYpos: Specifies the Y position * @param pchString: Pointer to a string to display on the screen * * @retval None */ void ssd1306_display_string(uint8_t chXpos, uint8_t chYpos, const uint8_t pchString, uint8_t chSize, uint8_t chMode) { while (pchString != '\0') { if (chXpos > (SSD1306_WIDTH - chSize / 2)) { chXpos = 0; chYpos += chSize; if (chYpos > (SSD1306_HEIGHT - chSize)) { chYpos = chXpos = 0; ssd1306_clear_screen(0x00); } } ssd1306_display_char(chXpos, chYpos, pchString, chSize, chMode); chXpos += chSize / 2; pchString ++; } } void ssd1306_init(void) { #if 1 ssd1306_write_byte(0xAE, SSD1306_CMD);//--turn off oled panel ssd1306_write_byte(0x00, SSD1306_CMD);//---set low column address ssd1306_write_byte(0x10, SSD1306_CMD);//---set high column address ssd1306_write_byte(0x40, SSD1306_CMD);//--set start line address Set Mapping RAM Display Start Line (0x00~0x3F) ssd1306_write_byte(0x81, SSD1306_CMD);//--set contrast control register ssd1306_write_byte(0xCF, SSD1306_CMD);// Set SEG Output Current Brightness ssd1306_write_byte(0xA1, SSD1306_CMD);//--Set SEG/Column Mapping ssd1306_write_byte(0xC0, SSD1306_CMD);//Set COM/Row Scan Direction ssd1306_write_byte(0xA6, SSD1306_CMD);//--set normal display ssd1306_write_byte(0xA8, SSD1306_CMD);//--set multiplex ratio(1 to 64) ssd1306_write_byte(0x3f, SSD1306_CMD);//--1/64 duty ssd1306_write_byte(0xD3, SSD1306_CMD);//-set display offset Shift Mapping RAM Counter (0x00~0x3F) ssd1306_write_byte(0x00, SSD1306_CMD);//-not offset ssd1306_write_byte(0xd5, SSD1306_CMD);//--set display clock divide ratio/oscillator frequency ssd1306_write_byte(0x80, SSD1306_CMD);//--set divide ratio, Set Clock as 100 Frames/Sec ssd1306_write_byte(0xD9, SSD1306_CMD);//--set pre-charge period ssd1306_write_byte(0xF1, SSD1306_CMD);//Set Pre-Charge as 15 Clocks & Discharge as 1 Clock ssd1306_write_byte(0xDA, SSD1306_CMD);//--set com pins hardware configuration ssd1306_write_byte(0x12, SSD1306_CMD); ssd1306_write_byte(0xDB, SSD1306_CMD);//--set vcomh ssd1306_write_byte(0x40, SSD1306_CMD);//Set VCOM Deselect Level ssd1306_write_byte(0x20, SSD1306_CMD);//-Set Page Addressing Mode (0x00/0x01/0x02) ssd1306_write_byte(0x02, SSD1306_CMD);// ssd1306_write_byte(0x8D, SSD1306_CMD);//--set Charge Pump enable/disable ssd1306_write_byte(0x14, SSD1306_CMD);//--set(0x10) disable ssd1306_write_byte(0xA4, SSD1306_CMD);// Disable Entire Display On (0xa4/0xa5) ssd1306_write_byte(0xA6, SSD1306_CMD);// Disable Inverse Display On (0xa6/a7) ssd1306_write_byte(0xAF, SSD1306_CMD);//--turn on oled panel #else ssd1306_write_byte(0xAE, SSD1306_CMD);//--turn off oled panel ssd1306_write_byte(0x00, SSD1306_CMD);//---set low column address ssd1306_write_byte(0x10, SSD1306_CMD);//---set high column address ssd1306_write_byte(0x40, SSD1306_CMD);//--set start line address Set Mapping RAM Display Start Line (0x00~0x3F) ssd1306_write_byte(0xB0, SSD1306_CMD);// ssd1306_write_byte(0xC0, SSD1306_CMD);//Set COM/Row Scan Direction ssd1306_write_byte(0x81, SSD1306_CMD);//--set contrast control register ssd1306_write_byte(0xCF, SSD1306_CMD);// Set SEG Output Current Brightness ssd1306_write_byte(0xA1, SSD1306_CMD);//--Set SEG/Column Mapping ssd1306_write_byte(0xA6, SSD1306_CMD);//--set normal display ssd1306_write_byte(0xA8, SSD1306_CMD);//--set multiplex ratio(1 to 64) ssd1306_write_byte(0x3f, SSD1306_CMD);//--1/64 duty ssd1306_write_byte(0xC8, SSD1306_CMD);//-set display offset Shift Mapping RAM Counter (0x00~0x3F) ssd1306_write_byte(0xD3, SSD1306_CMD);//-set display offset Shift Mapping RAM Counter (0x00~0x3F) ssd1306_write_byte(0xC0, SSD1306_CMD);//-not offset ssd1306_write_byte(0xd5, SSD1306_CMD);//--set display clock divide ratio/oscillator frequency ssd1306_write_byte(0x80, SSD1306_CMD);//--set divide ratio, Set Clock as 100 Frames/Sec ssd1306_write_byte(0xD9, SSD1306_CMD);//--set pre-charge period ssd1306_write_byte(0xF1, SSD1306_CMD);//Set Pre-Charge as 15 Clocks & Discharge as 1 Clock ssd1306_write_byte(0xDA, SSD1306_CMD);//--set com pins hardware configuration ssd1306_write_byte(0x12, SSD1306_CMD); ssd1306_write_byte(0xDB, SSD1306_CMD);//--set vcomh ssd1306_write_byte(0x40, SSD1306_CMD);//Set VCOM Deselect Level ssd1306_write_byte(0x8D, SSD1306_CMD);//--set Charge Pump enable/disable ssd1306_write_byte(0x10, SSD1306_CMD);//--set(0x10) disable ssd1306_write_byte(0xAF, SSD1306_CMD);//--turn on oled panel #endif ssd1306_display_on(); ssd1306_clear_screen(0xff); } static int spi_ssd1306_probe(struct spi_device spi) { printk("=11=spi_ssd1306_proben"); spi_ssd1306_dev = spi; spi_ssd1306_dev->bits_per_word = 9; ssd1306_init(); printk("=2=spi_ssd1306_proben"); ssd1306_clear_screen(0x00); printk("=3=spi_ssd1306_proben"); ssd1306_display_off(); printk("=4=spi_ssd1306_proben"); ssd1306_display_string(18, 0, "hello, Linux!", 16, 1); ssd1306_display_string(0, 16, "this is a spi driver demo!", 16, 1); ssd1306_refresh_gram(); ssd1306_display_on(); printk("=5=spi_ssd1306_proben"); return 0; } static int spi_ssd1306_remove(struct spi_device spi) { printk("ssd1306_removen"); ssd1306_clear_screen(0x00); ssd1306_display_off(); return 0; } static const struct of_device_id ssd1306_dt_ids[] = { { .compatible = "oled,ssd1306" }, {}, }; MODULE_DEVICE_TABLE(of, ssd1306_dt_ids); static struct spi_driver spi_ssd1306_driver = { .driver = { .name = "spi_ssd1306", .bus = &spi_bus_type, .owner = THIS_MODULE, .of_match_table = of_match_ptr(ssd1306_dt_ids), }, .probe = spi_ssd1306_probe, .remove = spi_ssd1306_remove, }; static int __init spi_ssd1306_init(void) { printk("=0000=spi_ssd1306_initn"); return spi_register_driver(&spi_ssd1306_driver); } static void __exit spi_ssd1306_exit(void) { spi_unregister_driver(&spi_ssd1306_driver); } module_init(spi_ssd1306_init); module_exit(spi_ssd1306_exit); MODULE_LICENSE("GPL"); 复制代码 5.改进方案 a.此次点亮的OLED模块是3-wire模式，4-wire和IIC模式后面有时间在尝试实现。 b.此次OELD显示的字符串是直接写在驱动中，后面有时间会尝试通过fileoption的方式在应用层实现输入显示内容。 c.因为时间关系，并没有详细按照OLED的文档进行解析，驱动中初始化，ON，OFF等等功能是如何实现的，后面有时间会补上。 6.特别感谢这里特别感谢hackfun同学，非常感谢他无私，非常耐心的帮我理顺实现思路。知识点总结： 1.DTSI中如何设置GPIO模拟SPI 2.T*I中如何在驱动中设置某个GPIO为“输出”，状态为“高”。 3.这种SPI协议驱动的器件，知道如何正确的使用示波器非常重要，非常重要，非常重要。 4.OLED驱动初始化，数据传输实现。 0
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