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Description
i2c-tool是树莓派等Linux单板机上常见的一种I2C调试工具,具备I2C设备扫描、寄存器读写等功能。
我计划编写/移植一个类似的工具。大家可以把想法写在这里。
我的另外一个想法是,仿照RT1052的FlexSPI,或者RT1052的DCD,或者是U8G2库的实现方式,创建一个通用I2C工具。这个工具接收一个由命令组成的数组,并将其转换成I2C操作。通过这个工具,我们就可以非常方便地定义I2C读写序列。这样,在使用一些不常用的I2C设备时,我们就可以根据手册直接编写I2C序列,迅速完成功能测试。
参考代码:来自U8G2项目
/* this is a copy of the init sequence for the seeed 96x96 oled */
static const uint8_t u8x8_d_ssd1327_ea_w128128_init_seq[] = {
U8X8_START_TRANSFER(), /* enable chip, delay is part of the transfer start */
U8X8_CA(0x0fd, 0x012), /* unlock display, usually not required because the display is unlocked after reset */
U8X8_C(0x0ae), /* display off */
//U8X8_CA(0x0a8, 0x03f), /* multiplex ratio: 0x03f * 1/64 duty */
U8X8_CA(0x0a8, 0x05f), /* multiplex ratio: 0x05f * 1/64 duty */
U8X8_CA(0x0a1, 0x000), /* display start line */
//U8X8_CA(0x0a2, 0x04c), /* display offset, shift mapping ram counter */
U8X8_CA(0x0a2, 0x010), /* display offset, shift mapping ram counter */
U8X8_CA(0x0a0, 0x051), /* remap configuration */
U8X8_CA(0x0ab, 0x001), /* Enable internal VDD regulator (RESET) */
//U8X8_CA(0x081, 0x070), /* contrast, brightness, 0..128 */
U8X8_CA(0x081, 0x053), /* contrast, brightness, 0..128 */
//U8X8_CA(0x0b1, 0x055), /* phase length */
U8X8_CA(0x0b1, 0x051), /* phase length */
//U8X8_CA(0x0b3, 0x091), /* set display clock divide ratio/oscillator frequency (set clock as 135 frames/sec) */
U8X8_CA(0x0b3, 0x001), /* set display clock divide ratio/oscillator frequency */
//? U8X8_CA(0x0ad, 0x002), /* master configuration: disable embedded DC-DC, enable internal VCOMH */
//? U8X8_C(0x086), /* full current range (0x084, 0x085, 0x086) */
U8X8_C(0x0b9), /* use linear lookup table */
//U8X8_CA(0x0bc, 0x010), /* pre-charge voltage level */
U8X8_CA(0x0bc, 0x008), /* pre-charge voltage level */
//U8X8_CA(0x0be, 0x01c), /* VCOMH voltage */
U8X8_CA(0x0be, 0x007), /* VCOMH voltage */
U8X8_CA(0x0b6, 0x001), /* second precharge */
U8X8_CA(0x0d5, 0x062), /* enable second precharge, internal vsl (bit0 = 0) */
U8X8_C(0x0a4), /* normal display mode */
U8X8_END_TRANSFER(), /* disable chip */
U8X8_END() /* end of sequence */
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