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[已解决] 求助:arduino 怎样去读取ET7208 七段音频数据 |
Cain 发表于 2015-5-26 10:15 我照上面写了可是读不出数据来,下面是我写的代码 int scl = 2; int sda = 3; void setup() { // put your setup code here, to run once: I2C_Init(); Serial.begin(9600); } void loop() { I2C_start(); i2c_writebyte(0x60); i2c_writebyte(0x07); I2C_start(); i2c_writebyte(0x61); Serial.println(i2c_readbyte(), HEX); I2C_stop(); pinMode(sda, OUTPUT); delay(1000); } void I2C_Init(void) { pinMode(sda, OUTPUT); pinMode(scl, OUTPUT); digitalWrite(scl, HIGH); digitalWrite(sda, HIGH); } void I2C_start(void) { digitalWrite(scl, HIGH); digitalWrite(sda, HIGH); delay(1); digitalWrite(sda, LOW); delay(1); digitalWrite(scl, LOW); } void I2C_stop() { digitalWrite(scl, LOW); digitalWrite(sda, LOW); digitalWrite(scl, HIGH); digitalWrite(sda, HIGH); } uint8_t i2c_writebyte(uint8_t d) //写一个字节 { uint8_t i; for (i = 0; i < 8; i++) { uint8_t temp; temp = d; temp = (temp & 0x80); if (temp == 0x80) { digitalWrite(sda, HIGH); } else { digitalWrite(sda, LOW); } d = (d << 1); delay(1); digitalWrite(scl, HIGH); delay(1); digitalWrite(scl, LOW); delay(1); } digitalWrite(sda, HIGH); delay(1); digitalWrite(scl, HIGH); delay(1); digitalWrite(scl, LOW); delay(1); } uint8_t i2c_readbyte(void) { uint8_t i, i2c_data; pinMode(sda, INPUT); i2c_data = 0x00; for (i = 0; i < 8; i++) { i2c_data = i2c_data << 1; delay(1); digitalWrite(scl, LOW); delay(1); digitalWrite(scl, HIGH); delay(1); if (digitalRead(sda) == HIGH) { i2c_data = i2c_data + 1; } else { i2c_data = i2c_data + 0; } } delay(1); digitalWrite(scl, LOW); delay(1); digitalWrite(scl, HIGH); return i2c_data; } |
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