简介：对于从MindMotion SuYong发送过来的带有SoftI2C 的移植版本进行测试。初步证明了该SoftI2C移植功能。利用OLED显示测试，可以看到该版本的SoftI2C的外部总线的命令非常慢。经过测试，可以看到该版本的SoftI2C对于输出时钟的控制没有准备好。

关键词： I2C，MM32，MicroPython

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MM32F3277
MicroPython

目录
Contents

测试
MicroPython

将MicroPython
下载到MCU

初步测试

编程测试

测试端口

测试I2C OLED

连接OLED

初步测试

初始化OLED

测试总结

后期改动

§01 MM32F3277 MicroPython

今天（2021-11-25）收到MindMotion SuYong发送过来对于MM32F3277的MicroPython增加I2C总线功能的移植版本。

微蓝[SY]:
卓老师，这两天仅仅搞出来这么个鬼东西微蓝[SY]:
硬件的i2c驱动，估计需要我亲自操刀了微蓝[SY]:
如果soft i2c能用，我就着手先搞硬件spi的优化和pwm通道的扩展微蓝[SY]:
这样还可以给我们做i2c硬件驱动的同事一点时间，让她调代码，或者请逐飞帮忙

下载地址： firmware-2021-11-25

下面对于这个版本进行测试。

一、测试 MicroPython

1、将MicroPython下载到MCU

▲ 图1.1.1 下载MicroPython到MM32F3277

2、初步测试

（1）REPL 测试machine模块

>>> import machine
>>> dir(machine)
['__name__', 'ADC', 'DAC', 'PWM', 'Pin', 'SDCard', 'SPI', 'SoftI2C', 'SoftSPI', 'UART', 'freq', 'mem16', 'mem32', 'mem8']
>>>

3、编程测试

对于MicroPython关于I2C编程的文档参见： MicroPython class I2C

▲ 图1.1.2 I2C使用用例

（1）初步测试

Ⅰ.测试程序

from machine                import I2C
import utimei2c = I2C(freq400000)
i2c.scan()
i2c.writeto(42, b'123')

Ⅱ.输出结果

>> Download MicroPython : 22 lines/515 characters.
>> -------------------------------------------------------------------------Traceback (most recent call last):File "<stdin>", line 9, in <module>
ImportError: can't import name I2C
>>>

（2）import SoftI2C

Ⅰ.测试代码

from machine                import Pin,SoftI2C
i2c = SoftI2C(freq400000)
i2c.scan()
i2c.writeto(42, b'123')

Ⅱ.输出结果

>> Download MicroPython : 22 lines/524 characters.
>> -------------------------------------------------------------------------Traceback (most recent call last):File "<stdin>", line 10, in <module>
ImportError: module not found
>>>

4、测试端口

二、测试I2C OLED

在 乐鑫esp8266模块MicroPython开发板MQTT物联网人工智能最小系统 测试了 I2C OLED模块，下面将其连接在MM32F3277上。

1、连接OLED

▲ 图1.2.1 在面包板上将OLED连接在测试板上

2、初步测试

（1）扫描总线

Ⅰ.测试代码

from machine                import Pin,SoftI2C
import utimeprint("Test I2C")scl = Pin('PA0')
sda = Pin('PA1')i2c = SoftI2C(scl, sda, freq=100000)ret = i2c.scan()
print(ret)

Ⅱ.输出结果

>> Download MicroPython : 26 lines/584 characters.
>> -------------------------------------------------------------------------Test I2C
[60]
>>>

从上面的scan得到的I2C的Slave的地址为60（0x3C），这与在 乐鑫esp8266模块MicroPython开发板MQTT物联网人工智能最小系统 给定的地址是一致的。

（2）测试写入

Ⅰ.测试代码

from machine                import Pin,SoftI2C
import utime
from micropython import constscl = Pin('PA0')
sda = Pin('PA1')i2c = SoftI2C(scl, sda, freq=100000)ret = i2c.scan()
print(ret)temp = bytearray(2)
i2c.start()
temp[0] = 120
temp[1] = 1
i2c.write(temp)
i2c.stop()print('Test end.')

Ⅱ.输出结果

>> Download MicroPython : 34 lines/760 characters.
>> -------------------------------------------------------------------------[60]
2
Test end.
>>>

可以看到写入两个字节。

3、初始化OLED

#!/usr/local/bin/python
# -*- coding: gbk -*-
#============================================================
# TESTI2C.PY                   -- by Dr. ZhuoQing 2021-11-25
#
# Note:
#============================================================
from machine                import Pin,SoftI2C
import utime
from micropython import const
#------------------------------------------------------------
scl = Pin('PA0')
sda = Pin('PA1')
i2c = SoftI2C(scl, sda, freq=100000)
#------------------------------------------------------------
SET_CONTRAST        = const(0x81)
SET_ENTIRE_ON       = const(0xa4)
SET_NORM_INV        = const(0xa6)
SET_DISP            = const(0xae)
SET_MEM_ADDR        = const(0x20)
SET_COL_ADDR        = const(0x21)
SET_PAGE_ADDR       = const(0x22)
SET_DISP_START_LINE = const(0x40)
SET_SEG_REMAP       = const(0xa0)
SET_MUX_RATIO       = const(0xa8)
SET_COM_OUT_DIR     = const(0xc0)
SET_DISP_OFFSET     = const(0xd3)
SET_COM_PIN_CFG     = const(0xda)
SET_DISP_CLK_DIV    = const(0xd5)
SET_PRECHARGE       = const(0xd9)
SET_VCOM_DESEL      = const(0xdb)
SET_CHARGE_PUMP     = const(0x8d)
#------------------------------------------------------------
class SSD1306():def __init__(self, width, height, external_vcc):self.width = widthself.height = heightself.external_vcc = external_vccself.pages = self.height // 8self.buffer = bytearray(self.pages * self.width)self.init_display()def init_display(self):for cmd in (SET_DISP | 0x00,            # offSET_MEM_ADDR, 0x00,         # horizontalSET_DISP_START_LINE | 0x00,SET_SEG_REMAP | 0x01,       # column addr 127 mapped to SEG0SET_MUX_RATIO, self.height - 1,SET_COM_OUT_DIR | 0x08,     # scan from COM[N] to COM0SET_DISP_OFFSET, 0x00,SET_COM_PIN_CFG, 0x02 if self.height == 32 else 0x12,SET_DISP_CLK_DIV, 0x80,SET_PRECHARGE, 0x22 if self.external_vcc else 0xf1,SET_VCOM_DESEL, 0x30,       # 0.83*VccSET_CONTRAST, 0xff,         # maximumSET_ENTIRE_ON,              # output follows RAM contentsSET_NORM_INV,               # not invertedSET_CHARGE_PUMP, 0x10 if self.external_vcc else 0x14,SET_DISP | 0x01):           # onself.write_cmd(cmd)self.fill(0xff)self.show()def fill(self, c):for i in range(len(self.buffer)):self.buffer[i] = cdef poweroff(self):self.write_cmd(SET_DISP | 0x00)def poweron(self):self.write_cmd(SET_DISP | 0x01)def contrast(self, contrast):self.write_cmd(SET_CONTRAST)self.write_cmd(contrast)def invert(self, invert):self.write_cmd(SET_NORM_INV | (invert & 1))def show(self):x0 = 0x1 = self.width - 1if self.width == 64:x0 += 32x1 += 32self.write_cmd(SET_COL_ADDR)self.write_cmd(x0)self.write_cmd(x1)self.write_cmd(SET_PAGE_ADDR)self.write_cmd(0)self.write_cmd(self.pages - 1)self.write_data(self.buffer)
class SSD1306_I2C(SSD1306):def __init__(self, width, height, i2c, addr=0x3c, external_vcc=False):self.i2c = i2cself.addr = addrself.temp = bytearray(2)super().__init__(width, height, external_vcc)def write_cmd(self, cmd):self.temp[0] = 0x80 # Co=1, D/C#=0self.temp[1] = cmdself.i2c.writeto(self.addr, self.temp)def write_data(self, buf):self.temp[0] = self.addr << 1self.temp[1] = 0x40         # Co=0, D/C#=1self.i2c.start()self.i2c.write(self.temp)self.i2c.write(buf)self.i2c.stop()
#------------------------------------------------------------
oled = SSD1306_I2C(128, 64, i2c, addr=0x3c)
#oled.text('Hello world!', 0, 0)
#oled.text('OLED test', 0, 50)
#oled. show()
#------------------------------------------------------------
#        END OF FILE : TESTI2C.PY
#============================================================

下面是在OLED初始化过程中写入1024 个字节的过程，过程异常的缓慢。

▲ 图1.2.2 刷新OLED过程

之所以这么慢，通过示波器测试SCL，SDA的波形，可以看到此时的波特率只有400Hz，与初始化的波特率相差很多。

▲ 图1.2.3 I2C总线的写过程

※ 测试总结 ※

对于从MindMotion SuYong发送过来的带有SoftI2C 的移植版本进行测试。初步证明了该SoftI2C移植功能。利用OLED显示测试，可以看到该版本的SoftI2C的外部总线的命令非常慢。

经过测试，可以看到该版本的SoftI2C对于输出时钟的控制没有准备好。

一、后期改动

scl = Pin('PA0')
sda = Pin('PA1')i2c = SoftI2C(scl, sda, freq=400000)

过来一个小时之后SuYong发送过来改动后的版本。经过测试，波特率可以达到400kHz，功能妥妥的。

▲ 图2.1.1 波特率为400kHz

▲ 图2.1.2 利用SoftI2C控制OLED显示非常平顺了

from machine                import Pin,SoftI2C
import utime
from micropython import constscl = Pin('PA0')
sda = Pin('PA1')i2c = SoftI2C(scl, sda, freq=400000)SET_CONTRAST        = const(0x81)
SET_ENTIRE_ON       = const(0xa4)
SET_NORM_INV        = const(0xa6)
SET_DISP            = const(0xae)
SET_MEM_ADDR        = const(0x20)
SET_COL_ADDR        = const(0x21)
SET_PAGE_ADDR       = const(0x22)
SET_DISP_START_LINE = const(0x40)
SET_SEG_REMAP       = const(0xa0)
SET_MUX_RATIO       = const(0xa8)
SET_COM_OUT_DIR     = const(0xc0)
SET_DISP_OFFSET     = const(0xd3)
SET_COM_PIN_CFG     = const(0xda)
SET_DISP_CLK_DIV    = const(0xd5)
SET_PRECHARGE       = const(0xd9)
SET_VCOM_DESEL      = const(0xdb)
SET_CHARGE_PUMP     = const(0x8d)font8x16 = 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SSD1306():def __init__(self, width, height, external_vcc):self.width = widthself.height = heightself.external_vcc = external_vccself.pages = self.height // 8self.buffer = bytearray(self.pages * self.width)self.init_display()def init_display(self):for cmd in (SET_DISP | 0x00,            # offSET_MEM_ADDR, 0x00,         # horizontalSET_DISP_START_LINE | 0x00,SET_SEG_REMAP | 0x01,       # column addr 127 mapped to SEG0SET_MUX_RATIO, self.height - 1,SET_COM_OUT_DIR | 0x08,     # scan from COM[N] to COM0SET_DISP_OFFSET, 0x00,SET_COM_PIN_CFG, 0x02 if self.height == 32 else 0x12,SET_DISP_CLK_DIV, 0x80,SET_PRECHARGE, 0x22 if self.external_vcc else 0xf1,SET_VCOM_DESEL, 0x30,       # 0.83*VccSET_CONTRAST, 0xff,         # maximumSET_ENTIRE_ON,              # output follows RAM contentsSET_NORM_INV,               # not invertedSET_CHARGE_PUMP, 0x10 if self.external_vcc else 0x14,SET_DISP | 0x01):           # onself.write_cmd(cmd)self.fill(0x0)self.show()def fill(self, c):for i in range(len(self.buffer)):self.buffer[i] = cdef poweroff(self):self.write_cmd(SET_DISP | 0x00)def poweron(self):self.write_cmd(SET_DISP | 0x01)def contrast(self, contrast):self.write_cmd(SET_CONTRAST)self.write_cmd(contrast)def invert(self, invert):self.write_cmd(SET_NORM_INV | (invert & 1))def show(self):x0 = 0x1 = self.width - 1if self.width == 64:x0 += 32x1 += 32self.write_cmd(SET_COL_ADDR)self.write_cmd(x0)self.write_cmd(x1)self.write_cmd(SET_PAGE_ADDR)self.write_cmd(0)self.write_cmd(self.pages - 1)self.write_data(self.buffer)def setpoint(self, x,y):liney = y//8yy = 1<<(y%8)self.buffer[liney*self.width+x] |= yydef setstring(self, x,y,str):for c in str:cid = ord(c) - 0x20cid *= 16for i in range(8):ii = y*self.width+x*8+iself.buffer[ii] = font8x16[cid+i]self.buffer[ii+self.width] = font8x16[cid+i+8]x += 1if x >= self.width//8:x = 0y += 1class SSD1306_I2C(SSD1306):def __init__(self, width, height, i2c, addr=0x3c, external_vcc=False):self.i2c = i2cself.addr = addrself.temp = bytearray(2)super().__init__(width, height, external_vcc)def write_cmd(self, cmd):self.temp[0] = 0x80 # Co=1, D/C#=0self.temp[1] = cmdself.i2c.writeto(self.addr, self.temp)def write_data(self, buf):self.temp[0] = self.addr << 1self.temp[1] = 0x40         # Co=0, D/C#=1self.i2c.start()self.i2c.write(self.temp)self.i2c.write(buf)self.i2c.stop()oled = SSD1306_I2C(128, 64, i2c, addr=0x3c)oled.setstring(0, 0, '  MM32F3277')
oled.setstring(0, 2, 'MicroPython:V2')
oled.show()count = 0
while True:oled.setstring(3, 6, 'Count:%04d'%count)count += 1oled.show()utime.sleep_ms(100)

■ 相关文献链接:

firmware-2021-11-25
MicroPython class I2C
乐鑫esp8266模块MicroPython开发板MQTT物联网人工智能最小系统

● 相关图表链接:

图1.1.1 下载MicroPython到MM32F3277
图1.1.2 I2C使用用例
图1.2.1 在面包板上将OLED连接在测试板上
图1.2.2 刷新OLED过程
图1.2.3 I2C总线的写过程

    if(strncmp(szString, "MPDLD", 5) == 0) {   // MicroPython Dlownloadchar szString[0x8000];Beep(1800, 50);strcpy(szString, "");Clipboard()->GetTextBuf(szString, sizeof(szString) - 1);SendChar(0x3, PORT1);       // Send CTRL+BSleep(100);SendChar(0x3, PORT1);       // Send CTRL+BSleep(100);ClearPort(PORT1);SendChar('\r', PORT1);double lfStart = GetDosTime();int nGreatCount = 0;int nGreatFlag = 0;for(;;) {if(GetDosTime() - lfStart > 1) break;char c;if(ReceChar(&c, PORT1) == 0) {if(c == '>') nGreatCount ++;if(c == ' ') {if(nGreatCount >= 3) {nGreatFlag = 1;break;}}}}ClearInfor();if(nGreatFlag == 0) {ShowInfor(">> Reset MicroPython...");RTSEnable(1, PORT1);Sleep(100);ClearPort(PORT1);RTSEnable(0, PORT1);ShowInfor(">> Wait for MicroPython coming back...");lfStart = GetDosTime();nGreatCount = 0;nGreatFlag = 0;for(;;) {if(GetDosTime() - lfStart > 3) break;char c;if(ReceChar(&c, PORT1) == 0) {if(c == '>') nGreatCount ++;if(c == ' ') {if(nGreatCount >= 3) {nGreatFlag = 1;break;}}}}}//-------------------------------------------------------------------int nLength = strlen(szString);int i;int nLine = 0;for(i = 0; i < nLength; i ++) {if(szString[i] == '\n') nLine ++;}char szTemp[512];sprintf(szTemp, ">> Download MicroPython : %d lines/%d characters.", nLine, nLength);ShowInfor(szTemp);Sleep(200);if(nGreatFlag == 0) {MessageBeep(0);SendChar(0x2, PORT1);       // Send CTRL+BSleep(100);SendChar(0x2, PORT1);       // Send CTRL+BSleep(100);}SendChar(0x5, PORT1);       // Send CTRL+ESleep(100);for(i = 0; i < nLength; i ++) {ProgressBar1->Position = (i + 1) * 100 / nLength;char c = szString[i];if(c == '\r') continue;SendChar(c, PORT1);//            if(c == '\n') Sleep(1);}/*        int nSendLength = 0x10;int nSendTime = (nLength + nSendLength - 1) / nSendLength;for(i = 0; i < nSendTime; i ++) {ProgressBar1->Position = (i + 1) * 100 / nSendTime;int nBufLength = nLength - i * nSendLength;if(nBufLength > nSendLength) nBufLength = nSendLength;SendCharDim(&szString[i * nSendLength], nBufLength, PORT1);}
*/for(;;) {char c;if(ReceCharL(&c, PORT1, 20) > 0) break;}ShowInfor(">> -------------------------------------------------------------------------");SendChar(0x4, PORT1);      // Send CTRL+BBeep(800, 100);return;}

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MindMotion MM32F3277 SoftI2C功能测试

§01 MM32F3277 MicroPython

一、测试 MicroPython

1、将MicroPython下载到MCU

2、初步测试

（1）REPL 测试machine模块

3、编程测试

（1）初步测试

Ⅰ.测试程序

Ⅱ.输出结果

（2）import SoftI2C

Ⅰ.测试代码

Ⅱ.输出结果

4、测试端口

二、测试I2C OLED

1、连接OLED

2、初步测试

（1）扫描总线

Ⅰ.测试代码

Ⅱ.输出结果

（2）测试写入

Ⅰ.测试代码

Ⅱ.输出结果

3、初始化OLED

※ 测试总结 ※

一、后期改动

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