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Found 2 results

  1. curtis63

    i2c has the SDA line held low

    I'm attempting to get as close to an OpenCollector PIN as I can with the MSP430G2553 Launchpad and a sensor. SCL is P1.6 and SDA is P1.7. I digital write both pins LOW and then set the PinMode on both to INPUT which should allow both pins to float HIGH. I have a 4.7K pullup resistor on each pin connecting it to 3.55v (HIGH). Is my code wrong, or is the sensor that I'm using pulling the line low? The sensor says it operates at a max of 3.7 volts. I'm using the Launchpad which measures 3.55v. Am I overloading the sensor and causing it to pull SDA to low? #define SDA P1_7 #define SCL P1_6 void setup() { Serial.begin(9600); Serial.println("Starting..."); digitalWrite(SDA, LOW); digitalWrite(SCL, LOW); pinMode(SDA, INPUT); pinMode(SCL, INPUT); delay(50); Serial.print("SDA pin - "); Serial.print(SDA); Serial.print(" - "); Serial.println(digitalRead(SDA)); Serial.print("SCL pin - "); Serial.print(SCL); Serial.print(" - "); Serial.println(digitalRead(SCL)); }
  2. Hello, I want to connect my MSP-EXP430F5529LP ("MSP430") LaunchPad to an external device via I2C. Which I2C port should I use? (1) The MSP430 Quick Start Guide (slau536.pdf) includes a diagram of the BoosterPack connector showing two sets of I2C ports: -set#1- I2C - SCL - PM_UCB1SOMI - PM_UCB1SCL - P4.2 I2C - SDA - PM_UCB1SIMO - PM_UCB1SDA - P4.1 -set#2- UCB0SDA - UCB0SIMO - P3.0 UCB0SCL - UCB0SOMI - P3.1 (2) I am using the sample project, usci_b_i2c_ex3_masterTxSingle.c. MSP430ware->Libraries->Driver Library->MSP430F5xx_6xx->Example Projects->USCI_B_I2C->usci_b_i2c_ex3_masterTxSingle The source file references "USCI_B0_Base" throughout (and not "USCI_B1_Base"). Question: Should I use SCL on P4.2 and SDA on P4.1 and change all software to "USCI_B1_Base"? Question: Or should I use SCL on P3.1 and SDA on P3.0 and use "USCI_B0_Base"? If I do, do I configure the pinmux? How would I do that? It seems to me that the sample project is assuming that the I2C is connected to UCB0 (and not UCB1), but the MSP430 LaunchPad, in its standard configuration, is using UCB0 for I2C. I appreciate any help from the community! ElectricCowboy
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