This software drives a PCA9675 device via an I2C bus. Included functions allow you to read the device ID, set the IO direction, and read and write from the device.
Source/main.cpp
- Committer:
- DavidGilesHitex
- Date:
- 2010-11-23
- Revision:
- 0:3331b5950572
File content as of revision 0:3331b5950572:
/* PCA9675 Device Driver C++ Example */ /* ********************************* */ #include "mbed.h" #include "misra_types.h" /* MISRA Types */ #include "PCA9675.h" #define PCA9675_BASE_BOARD_SLAVE_ADDRESS 0x20 /* I2C Interface */ /* Create a master I2C bus called CNTRL_i2C using pins 9 and 10 for SDA, & SCL respectively */ /* This I2C bus can be used fr many peripherals and not just the PCA9675 */ I2C CNTRL_i2c(p9, p10); /* Configure the USB as a virtual communications port */ Serial pc(USBTX, USBRX); /* Create a global object of PCA96755 class called BaseBoardLatch */ /* this device will use CNTRL_i2c bus and has a slave address of PCA9675_BASE_BOARD_SLAVE_ADDRESS*/ PCA9675 BaseBoardLatch(&CNTRL_i2c, PCA9675_BASE_BOARD_SLAVE_ADDRESS); int main() { uint8_t port0_payload = 0; uint8_t port1_payload = 0; uint8_t manufacturer = 0; uint16_t part_ident = 0; uint8_t die_revision = 0; uint8_t MySlaveAddress = 0; sint32_t Ack_Status = 0; pc.baud(115000); /* Baud rate should be 115k baud */ pc.format(8,Serial::None,1); /* format is 8 data bits, no stop bit, no parity */ pc.printf("\n\n\n\n\n\n\n\rWelcome to the I2C PCA9675 Driver Test Routines for mbed\n\r\n"); CNTRL_i2c.frequency(400000); /* Set the I2C to be 400kHz */ /* Read the PCA9575 device ID */ pc.printf("Reading the device ID\n\r"); Ack_Status = BaseBoardLatch.read_device_ID(&manufacturer, &part_ident, &die_revision); pc.printf("Read ID: Ack status = "); if (Ack_Status == BaseBoardLatch.eI2C_ACK) pc.printf("ACK\n\r"); else pc.printf ("NACK\n\r"); pc.printf("The stored identification for this device is:\n\r"); pc.printf(" * Manufacturer Code = 0x%.2x\n\r", manufacturer); pc.printf(" * Part Idenfification = 0x%.4x\n\r", part_ident); pc.printf(" * Die Revision = 0x%.1x\n\r", die_revision); /* Use this code for output */ /* Setup the I/O direction : for each bit 1=input and 0=output */ /* Order is Port0 and Port1 */ pc.printf("\nSetting the device for quasi output mode\n\r"); Ack_Status = BaseBoardLatch.init(0x00, 0x00); pc.printf("Initialise: Ack status = "); if (Ack_Status == BaseBoardLatch.eI2C_ACK) pc.printf("ACK\n\r"); else pc.printf ("NACK\n\r"); pc.printf("Writing data to the latch\n\r"); Ack_Status = BaseBoardLatch.write_data(port0_payload, port1_payload); /* Write two bytes of data to the device */ pc.printf("Write data: Ack status = "); if (Ack_Status == BaseBoardLatch.eI2C_ACK) pc.printf("ACK\n\r"); else pc.printf ("NACK\n\r"); /* Use this code for input */ /* Setup the I/O direction : for each bit 1=input and 0=output */ /* Order is Port0 and Port1 */ pc.printf("\nSetting the device for quasi input mode\n\r"); Ack_Status = BaseBoardLatch.init(0xff, 0xff); pc.printf("Initialise: Ack status = "); if (Ack_Status == BaseBoardLatch.eI2C_ACK) pc.printf("ACK\n\r"); else pc.printf ("NACK\n\r"); Ack_Status = BaseBoardLatch.read_data(&port0_payload, &port1_payload); /* Read two bytes from the device */ pc.printf("Read data: Ack status = ", Ack_Status); if (Ack_Status == BaseBoardLatch.eI2C_ACK) pc.printf("ACK\n\r"); else pc.printf ("NACK\n\r"); pc.printf("Port0 = 0x%.2x, Port1 = 0x%.2x\n\r", port0_payload, port1_payload); /* Read back the slave address of the PCA9675 object if we need to recall it */ MySlaveAddress = BaseBoardLatch.read_slave_address(); pc.printf("\nThe 7 bit Slave address: is = 0x%.2x\n\r", MySlaveAddress); }