岳阳设计网站推荐,中山电子商务网站建设,企业融资案例,手机建设银行网站首页1. 硬件IIC 实在是太难用了#xff0c;各种卡死#xff0c;各种发不出来数据#xff0c;没那么多时间折腾了#xff0c;还是用软件IIC 先吧#xff0c;初始化
void OLED_Software_IIC_Init(void)
{GPIO_InitTypeDef GPIO_InitStruct;RCC_AHBPeriphClockCmd(OLED_SOFTWARE…1. 硬件IIC 实在是太难用了各种卡死各种发不出来数据没那么多时间折腾了还是用软件IIC 先吧初始化
void OLED_Software_IIC_Init(void)
{GPIO_InitTypeDef GPIO_InitStruct;RCC_AHBPeriphClockCmd(OLED_SOFTWARE_IIC_PORT_B | OLED_SOFTWARE_IIC_AF_CLOCK, ENABLE);GPIO_InitStruct.GPIO_Pin OLED_IIC_SDA_PIN_B11 | OLED_IIC_SCL_PIN_B10;GPIO_InitStruct.GPIO_Mode GPIO_Mode_OUT;GPIO_InitStruct.GPIO_OType GPIO_OType_PP;GPIO_InitStruct.GPIO_PuPd GPIO_PuPd_UP;GPIO_InitStruct.GPIO_Speed GPIO_Speed_40MHz;GPIO_Init(GPIOB, GPIO_InitStruct); // PB11 - SDA, PB10 - SCLGPIO_SetBits(GPIOB, OLED_IIC_SDA_PIN_B11 | OLED_IIC_SCL_PIN_B10);OLED_IIC_Stop();
}2. 一些宏定义,带FreeRTOS 实时操作系统系统节拍设置为1ms系统主频设置为32Mhz
#define OLED_USE_SOFTWARE_IIC#define OLED_SOFTWARE_IIC_PORT_B RCC_AHBPeriph_GPIOB // SCL - PB10, SDA -PB11
#define OLED_SOFTWARE_IIC_AF_CLOCK RCC_APB1Periph_I2C2#define IIC_TIMEOUT_COUNTER 0x2000 // iic transmit timeout#define OLED_IIC_SCL_PIN_B10 GPIO_Pin_10
#define OLED_IIC_SDA_PIN_B11 GPIO_Pin_11
#define OLED_SCL_H() GPIO_SetBits(GPIOB, OLED_IIC_SCL_PIN_B10)
#define OLED_SCL_L() GPIO_ResetBits(GPIOB, OLED_IIC_SCL_PIN_B10)#define OLED_ADDRESS 0x78 // 0x78: device address write, 0x79 - device address read
#define IIC_CMD_LEN 2#define OLED_SDA_H() GPIO_SetBits(GPIOB, OLED_IIC_SDA_PIN_B11)
#define OLED_SDA_L() GPIO_ResetBits(GPIOB, OLED_IIC_SDA_PIN_B11)#define OLED_SDA_READ() GPIO_ReadInputDataBit(GPIOB, OLED_IIC_SDA_PIN_B11)3. 延时函数CPU 阻塞空转
static void IIC_Delay(void)
{uint8_t temp;for (temp 0; temp 10; temp){// do nothing}
}4. 起始信号
static void OLED_IIC_Start(void)
{OLED_SDA_H();OLED_SCL_H();IIC_Delay();OLED_SDA_L();IIC_Delay();OLED_SCL_L();IIC_Delay();
}5. 停止信号
static void OLED_IIC_Stop(void)
{OLED_SDA_L();OLED_SCL_H();IIC_Delay();OLED_SDA_H();IIC_Delay();
}6. 发送一个字节的数据
static void OLED_IIC_SendByte(uint8_t data)
{uint8_t index;GPIO_InitTypeDef GPIO_InitStruct;for (index 0; index 8; index) // send one byte data, first send MSB (bit[7]), send LSB at the last (bit[0]){if (data 0x80){OLED_SDA_H(); // send 1}else{OLED_SDA_L(); // send 0}IIC_Delay();OLED_SCL_H();IIC_Delay();OLED_SCL_L();data 1; // send next bit (MSB - LSB)IIC_Delay();}
// OLED_SDA_H();GPIO_InitStruct.GPIO_Pin OLED_IIC_SDA_PIN_B11;GPIO_InitStruct.GPIO_Mode GPIO_Mode_IN;GPIO_InitStruct.GPIO_PuPd GPIO_PuPd_UP;GPIO_Init(GPIOB, GPIO_InitStruct);IIC_Delay();
}7. 发送一个字节数据后等待从机回复一个ACK 信号
uint8_t OLED_IIC_WaitAck(void)
{uint8_t ret;OLED_SCL_H();if (OLED_SDA_READ()){ret 1; // not received ACK signal, wait fail}else{ret 0; // received ACK signal, wait success}IIC_Delay();OLED_SCL_L();IIC_Delay();return ret;
}8. GPIO 重新初始化
static void OLED_SoftwareIIC_SDA_Resume(void)
{GPIO_InitTypeDef GPIO_InitStruct;GPIO_InitStruct.GPIO_Pin OLED_IIC_SDA_PIN_B11;GPIO_InitStruct.GPIO_Mode GPIO_Mode_OUT;GPIO_InitStruct.GPIO_OType GPIO_OType_PP;GPIO_InitStruct.GPIO_PuPd GPIO_PuPd_UP;GPIO_InitStruct.GPIO_Speed GPIO_Speed_40MHz;GPIO_Init(GPIOB, GPIO_InitStruct); // PB11 - SDA
}
9. 模仿HAL库写的一个自己的函数,实现功能发送设备地址读写控制再发送0x00表示发的是命令再发一个字节数据具体的内容数据共发了三个字节的数据加了超时退出机制
/** imitate the stm32 HAL library, achieve myselfs software i2c send function* deviceAddr: 0x78 - device address and write operation, 0x79 - device address and read operation*/
static void HAL_I2C_Master_Transmit(I2C_TypeDef *I2Cx, uint8_t deviceAddr, uint8_t buff[], uint16_t buffLen, uint32_t timeout)
{uint32_t temp;uint16_t index;temp timeout;OLED_IIC_Start();IIC_Delay();OLED_IIC_SendByte(deviceAddr); // device address and write bitwhile (OLED_IIC_WaitAck()){temp--;if (0 temp){return;}IIC_Delay();}OLED_SoftwareIIC_SDA_Resume();for (index 0; index buffLen; index){OLED_IIC_SendByte(buff[index]);IIC_Delay();while (OLED_IIC_WaitAck()){temp--;if (0 temp){return;}IIC_Delay();}OLED_SoftwareIIC_SDA_Resume();IIC_Delay();}OLED_IIC_Stop();
}10. 向OLED 发送指令函数
static void OLED_SendCmd(uint8_t cmd)
{uint8_t sendBuff[2];sendBuff[0] 0x00;sendBuff[1] cmd;HAL_I2C_Master_Transmit(I2C2, OLED_ADDRESS, sendBuff, IIC_CMD_LEN, IIC_TIMEOUT_COUNTER);
}11. OLED 初始化函数,OLED 用的龙科显示公式的产品控制IC 用的是CH1116G他们给我发是资料却是SH1106的
void OLED_Init(void)
{delay_xms(200); // oled startup slowly than stm32l151c8t6INFO_LOG([OLED_Init] init start\r\n);OLED_SendCmd(0xAE); // display offOLED_SendCmd(0x02); // set colum start address, low 4-bitsOLED_SendCmd(0x10); // set colum end address, high 4-bitsOLED_SendCmd(0x40); // set start line (first row)OLED_SendCmd(0xB0); // set page addressdelay_xms(5);OLED_SendCmd(0x81); // set contrast ratio (对比度)delay_xms(5);OLED_SendCmd(0xCF); // 128delay_xms(5);OLED_SendCmd(0xA1); // set segment remapping, from right to leftOLED_SendCmd(0xA6); // forward display, normal or reverseOLED_SendCmd(0xA8); // multiple reuse rate, multiple ratio (多路复用率)OLED_SendCmd(0x3F); // duty 1 / 64OLED_SendCmd(0xAD); // set charge pump enableOLED_SendCmd(0x8B); // enable DC-DCOLED_SendCmd(0x33); // set VPP 10VOLED_SendCmd(0xC8); // set output scan direction, COM[N - 1] to COM[0], COM scan directionOLED_SendCmd(0xD3); // set display offsetOLED_SendCmd(0x00); // 0x00OLED_SendCmd(0xD5); // set internal clock frequence, set osc frequencyOLED_SendCmd(0xC0);OLED_SendCmd(0xD9); // set pre-charge periodOLED_SendCmd(0x1F); // 0x22OLED_SendCmd(0xDA); // set COM pins, pin layoutOLED_SendCmd(0x12);OLED_SendCmd(0xDB); // set electrical level, set VCOMHOLED_SendCmd(0x40);OLED_SendCmd(0xAF); // enable display, display onINFO_LOG([OLED_Init][alfred01] init complete\r\n);INFO_LOG([OLED_Init] init complete\r\n);
}12. OLED 测试函数
void OLED_Test(void)
{OLED_SendCmd(0xB0); // page 0OLED_SendCmd(0x02); // colume 0, low 4-bitsOLED_SendCmd(0x10); // colume 0, high 4-bitsuint8_t sendBuff[] {0x40, 0xAA, 0xAA, 0xAA, 0xAA, 0xAA, 0xAA, 0xAA, 0xAA, 0xAA, 0xAA, 0xAA, 0xAA, 0xAA, 0xAA, 0xAA};HAL_I2C_Master_Transmit(I2C2, OLED_ADDRESS, sendBuff, sizeof(sendBuff), IIC_TIMEOUT_COUNTER);
}13. OLED 初步显示效果表示控制驱动是OK的了其它的就是慢慢细调了 14. OLED 规格书控制芯片用的CH1116G这是硬件发给我和厂家给的不一致厂家说是兼容的那我就直接上手调了 15. 看这三个引脚接的是高电平还是低电平怎么组合的就知道用的什么接口需要看原理图了 需要看原理图了
16. 逻分仪抓的OLED 初始化时序图
