Remote 8-bit I/O expander for I2C-bus with interrupt
Revision 2:5cbf7e01ee23, committed 2017-10-11
- Comitter:
- mcm
- Date:
- Wed Oct 11 16:06:06 2017 +0000
- Parent:
- 1:26bfcb9024a0
- Commit message:
- The driver was completed and tested, it works as expected.
Changed in this revision
| PCF8574.cpp | Show annotated file Show diff for this revision Revisions of this file |
| PCF8574.h | Show annotated file Show diff for this revision Revisions of this file |
--- a/PCF8574.cpp Wed Oct 11 14:43:38 2017 +0000
+++ b/PCF8574.cpp Wed Oct 11 16:06:06 2017 +0000
@@ -19,7 +19,7 @@
PCF8574::PCF8574 ( PinName sda, PinName scl, uint32_t addr, uint32_t freq )
: i2c ( sda, scl )
- , PCF8574_Addr ( addr )
+ , PCF8574_Addr ( addr )
{
i2c.frequency( freq );
}
--- a/PCF8574.h Wed Oct 11 14:43:38 2017 +0000
+++ b/PCF8574.h Wed Oct 11 16:06:06 2017 +0000
@@ -22,7 +22,91 @@
/**
Example:
-[TODO]
+#include "mbed.h"
+#include "PCF8574.h"
+
+
+PCF8574 myDevice ( I2C_SDA, I2C_SCL, PCF8574::PCF8574_ADDRESS_0, 400000 );
+
+Ticker newReading;
+DigitalOut myled1 ( LED1 );
+DigitalOut myled2 ( LED2 );
+InterruptIn myPCF8574INT ( p8 );
+
+
+PCF8574::PCF8574_status_t aux;
+uint32_t mySTATE = 0;
+
+
+void flip ( void )
+{
+ PCF8574::PCF8574_vector_data_t myData;
+
+ // Read the port to check P7 status
+ aux = myDevice.PCF8574_ReadPins ( &myData );
+
+ if ( ( myData.data & PCF8574::PCF8574_P7_MASK ) == PCF8574::PCF8574_P7_MASK )
+ myled2 = 1; // Turn the LED 2 on when P7 is HIGH
+ else
+ myled2 = 0; // Turn the LED 2 off when P7 is LOW
+}
+
+
+
+void changeDATA ( void )
+{
+ PCF8574::PCF8574_vector_data_t myData;
+
+
+ myled1 = 1;
+
+
+ // Read the port to mask P7
+ aux = myDevice.PCF8574_ReadPins ( &myData );
+ myData.data = ( myData.data & PCF8574::PCF8574_P7_MASK );
+
+ // Change the state of the PCF8574 pins: P[O-6]
+ if ( mySTATE == 0 ) {
+ myData.data |= ( PCF8574::PCF8574_P0_OUTPUT_LOW | PCF8574::PCF8574_P1_OUTPUT_HIGH | PCF8574::PCF8574_P2_OUTPUT_LOW | PCF8574::PCF8574_P3_OUTPUT_HIGH |
+ PCF8574::PCF8574_P4_OUTPUT_LOW | PCF8574::PCF8574_P5_OUTPUT_HIGH | PCF8574::PCF8574_P6_OUTPUT_LOW );
+
+ aux = myDevice.PCF8574_SetPins ( myData );
+
+ mySTATE = 1;
+ } else {
+ myData.data |= ( PCF8574::PCF8574_P0_OUTPUT_HIGH | PCF8574::PCF8574_P1_OUTPUT_LOW | PCF8574::PCF8574_P2_OUTPUT_HIGH | PCF8574::PCF8574_P3_OUTPUT_LOW |
+ PCF8574::PCF8574_P4_OUTPUT_HIGH | PCF8574::PCF8574_P5_OUTPUT_LOW | PCF8574::PCF8574_P6_OUTPUT_HIGH );
+
+ aux = myDevice.PCF8574_SetPins ( myData );
+
+ mySTATE = 0;
+ }
+
+ myled1 = 0;
+}
+
+
+int main()
+{
+ PCF8574::PCF8574_vector_data_t myData;
+
+ // Configure PCF8574: P[0-6] OUTPUTs, P7 INPUT
+ myData.data = ( PCF8574::PCF8574_P0_OUTPUT_LOW | PCF8574::PCF8574_P1_OUTPUT_LOW | PCF8574::PCF8574_P2_OUTPUT_LOW | PCF8574::PCF8574_P3_OUTPUT_LOW |
+ PCF8574::PCF8574_P4_OUTPUT_LOW | PCF8574::PCF8574_P5_OUTPUT_LOW | PCF8574::PCF8574_P6_OUTPUT_LOW | PCF8574::PCF8574_P7_INPUT );
+
+ aux = myDevice.PCF8574_SetPins ( myData );
+
+
+ myPCF8574INT.mode( PullUp );
+ myPCF8574INT.fall( &flip ); // attach the address of the flip function to the falling edge
+ newReading.attach( &changeDATA, 0.5 ); // the address of the function to be attached ( changeDATA ) and the interval ( 0.5s )
+
+
+ // Let the callbacks take care of everything
+ while(1) {
+ sleep();
+ }
+}
*/
@@ -37,23 +121,23 @@
* its functionality remains the same.
*/
typedef enum {
- PCF8574_ADDRESS_0 = 0x20, /*!< A2 A1 A0: 000 */
- PCF8574_ADDRESS_1 = 0x21, /*!< A2 A1 A0: 001 */
- PCF8574_ADDRESS_2 = 0x22, /*!< A2 A1 A0: 010 */
- PCF8574_ADDRESS_3 = 0x23, /*!< A2 A1 A0: 011 */
- PCF8574_ADDRESS_4 = 0x24, /*!< A2 A1 A0: 100 */
- PCF8574_ADDRESS_5 = 0x25, /*!< A2 A1 A0: 101 */
- PCF8574_ADDRESS_6 = 0x26, /*!< A2 A1 A0: 110 */
- PCF8574_ADDRESS_7 = 0x27, /*!< A2 A1 A0: 111 */
+ PCF8574_ADDRESS_0 = ( 0x20 << 1 ), /*!< A2 A1 A0: 000 */
+ PCF8574_ADDRESS_1 = ( 0x21 << 1 ), /*!< A2 A1 A0: 001 */
+ PCF8574_ADDRESS_2 = ( 0x22 << 1 ), /*!< A2 A1 A0: 010 */
+ PCF8574_ADDRESS_3 = ( 0x23 << 1 ), /*!< A2 A1 A0: 011 */
+ PCF8574_ADDRESS_4 = ( 0x24 << 1 ), /*!< A2 A1 A0: 100 */
+ PCF8574_ADDRESS_5 = ( 0x25 << 1 ), /*!< A2 A1 A0: 101 */
+ PCF8574_ADDRESS_6 = ( 0x26 << 1 ), /*!< A2 A1 A0: 110 */
+ PCF8574_ADDRESS_7 = ( 0x27 << 1 ), /*!< A2 A1 A0: 111 */
- PCF8574A_ADDRESS_0 = 0x38, /*!< A2 A1 A0: 000 */
- PCF8574A_ADDRESS_1 = 0x39, /*!< A2 A1 A0: 001 */
- PCF8574A_ADDRESS_2 = 0x3A, /*!< A2 A1 A0: 010 */
- PCF8574A_ADDRESS_3 = 0x3B, /*!< A2 A1 A0: 011 */
- PCF8574A_ADDRESS_4 = 0x3C, /*!< A2 A1 A0: 100 */
- PCF8574A_ADDRESS_5 = 0x3D, /*!< A2 A1 A0: 101 */
- PCF8574A_ADDRESS_6 = 0x3E, /*!< A2 A1 A0: 110 */
- PCF8574A_ADDRESS_7 = 0x3F /*!< A2 A1 A0: 111 */
+ PCF8574A_ADDRESS_0 = ( 0x38 << 1 ), /*!< A2 A1 A0: 000 */
+ PCF8574A_ADDRESS_1 = ( 0x39 << 1 ), /*!< A2 A1 A0: 001 */
+ PCF8574A_ADDRESS_2 = ( 0x3A << 1 ), /*!< A2 A1 A0: 010 */
+ PCF8574A_ADDRESS_3 = ( 0x3B << 1 ), /*!< A2 A1 A0: 011 */
+ PCF8574A_ADDRESS_4 = ( 0x3C << 1 ), /*!< A2 A1 A0: 100 */
+ PCF8574A_ADDRESS_5 = ( 0x3D << 1 ), /*!< A2 A1 A0: 101 */
+ PCF8574A_ADDRESS_6 = ( 0x3E << 1 ), /*!< A2 A1 A0: 110 */
+ PCF8574A_ADDRESS_7 = ( 0x3F << 1 ) /*!< A2 A1 A0: 111 */
} PCF8574_address_t;