David Giles
This is a complete listing of the RS-EDP software for the mbed module to support the RS-EDP platform.
Diff: SourceFiles/RSEDP_BB_24LC32_Serial_EEPROM.cpp
- Revision:
- 0:5b7639d1f2c4
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/SourceFiles/RSEDP_BB_24LC32_Serial_EEPROM.cpp Fri Nov 19 09:49:16 2010 +0000
@@ -0,0 +1,159 @@
+/* Serial EEPROM I2C Type 24LC32 C Source Code Driver File */
+/* ******************************************************* */
+
+/* Version 1.00 */
+/* Start Date: 25/2/2008 */
+
+
+
+/* Include Files Here */
+#include "mbed.h" /* mbed header file */
+#include "misra_types.h" /* MISRA Types header file */
+#include "defines.h"
+#include "mbed_Port_Structure.h" /* Port structure for MBED Module */
+
+#include "RSEDP_CNTRL_I2C.h" /* Control I2C Driver */
+
+
+
+/* Function Prototypes Here */
+sint32_t RSEDP_BB_setup_24LC32(uint8_t Slave_Address); /* Configure the I2C EEPROM */
+sint32_t RSEDP_BB_eeprom_store_byte(uint8_t Slave_Address, sint8_t payload, uint16_t eeaddress); /* Write one byte to one memory location */
+sint32_t RSEDP_BB_eeprom_store_bytes(uint8_t Slave_Address, sint8_t *payload, uint8_t qty, uint16_t eeaddress); /* Called by main to write multiple bytes to the serial EEPROM */
+sint32_t RSEDP_BB_eeprom_read_byte(uint8_t Slave_Address, sint8_t *read_value, uint16_t eeaddress); /* Read one byte from one location */
+sint32_t RSEDP_BB_eeprom_read_bytes(uint8_t Slave_Address, sint8_t *payload, uint16_t qty, uint16_t eeaddress); /* Read several byte from one location */
+
+static void delay_small(void); /* Local static 1us delay routine */
+
+
+
+
+/* Setup the serial interface to the EEPROM */
+sint32_t RSEDP_BB_setup_24LC32(uint8_t Slave_Address) /* Configure the 24LC32 */
+ {
+ sint32_t Ack_Status = 0;
+ /* Assume the I2C bus is already configured. This is normally done on mbed_Port_Structure.c */
+
+ Ack_Status = CNTRL_I2C_Master_Mode_Transmit(Slave_Address, 0, 1); /* Ping the device */
+ return Ack_Status;
+ }
+
+
+
+
+
+
+
+/* Store one byte at one address location */
+sint32_t RSEDP_BB_eeprom_store_byte(uint8_t Slave_Address, sint8_t payload, uint16_t eeaddress) /* Write one byte to one memory location */
+ {
+ sint32_t Ack_Status = 0;
+ sint8_t tx_array[3]; /* two byte array used to hold transmission packet */
+
+ eeaddress = (eeaddress & 0x0fff); /* Ensure address is not more than 12 bit */
+
+ tx_array[0] = (uint8_t) (eeaddress >> 8); /* Extract high part */
+ tx_array[1] = (uint8_t) eeaddress; /* Extract Low address */
+ tx_array[2] = payload; /* second member of array is the value to be stored */
+
+ Ack_Status = CNTRL_I2C_Master_Mode_Transmit(Slave_Address, tx_array, 3); /* Send a data packet to a slave, record acknowledge bit */
+ delay_small();
+ return Ack_Status;
+
+ }
+
+
+
+/* Write upto 32 bytes into the EEPROM all at once */
+sint32_t RSEDP_BB_eeprom_store_bytes(uint8_t Slave_Address, sint8_t *payload, uint8_t qty, uint16_t eeaddress) /* Called by main to write multiple bytes to the serial EEPROM */
+ {
+ sint32_t Ack_Status = 0;
+ uint8_t n=0; /* Scratch pad variable */
+ sint8_t tx_array[34]; /* transmission array */
+
+ eeaddress = (eeaddress & 0x0fff); /* Cap range to 12 bit address */
+
+ tx_array[0]=(uint8_t) (eeaddress >> 8); /* Extract high address byte */
+ tx_array[1]=(uint8_t) eeaddress; /* Extract Low address */
+
+ for (n = 2; n < (qty + 2); n++) /* Copy the transmission data into a local array */
+ {
+ tx_array[n] = *payload;
+ payload++;
+ }
+
+ Ack_Status = CNTRL_I2C_Master_Mode_Transmit(Slave_Address, tx_array, (qty+2)); /* Send data out on I2C bus */
+ delay_small(); /* EEPROM Busy period - self timed */
+ return Ack_Status;
+ }
+
+
+
+
+/* Read One Byte From An Address */
+sint32_t RSEDP_BB_eeprom_read_byte(uint8_t Slave_Address, sint8_t *payload, uint16_t eeaddress) /* Read one byte from one location */
+ {
+ sint32_t Ack_Status = 0;
+ sint8_t tx_array[3];
+ sint8_t rx_array = 0; /* Variable used to receive data from slave */
+
+ eeaddress = (eeaddress & 0x0fff); /* Cap address to 12 bit */
+
+ tx_array[0] = (uint8_t) (eeaddress >> 8); /* Extract high order byte */
+ tx_array[1] = (uint8_t) eeaddress; /* Extract low address */
+
+ Ack_Status = CNTRL_I2C_Master_Mode_Transmit(Slave_Address, tx_array, 2); /* Set the EEPROM address */
+
+// delay_small(); /* EEPROM is busy writing */
+
+ if (Ack_Status == ACK)
+ {
+ Ack_Status = CNTRL_I2C_Master_Mode_Receive(Slave_Address, &rx_array,1); /* Read single byte address */
+ }
+
+ *payload = rx_array; /* Load value from EEPROM into receive pointer */
+ return Ack_Status;
+
+ }
+
+
+/* Read several byte from the memory location */
+sint32_t RSEDP_BB_eeprom_read_bytes(uint8_t Slave_Address, sint8_t *payload, uint16_t qty, uint16_t eeaddress)
+ {
+ sint32_t Ack_Status = 0;
+ sint8_t tx_array[3];
+ uint8_t address_low = 0; /* EEPROM high address byte */
+ uint8_t address_high = 0; /* EEPROM low address byte */
+
+ eeaddress = (eeaddress & 0x0fff); /* Cap to 12 bit address */
+ address_high = (uint8_t) (eeaddress >> 8); /* Extract high order address byte */
+ address_low = (uint8_t) eeaddress; /* Extract Low address byte */
+
+ tx_array[0] = address_high; /* first member of array is the EEPROM high address */
+ tx_array[1] = address_low; /* Low byte next */
+
+ Ack_Status = CNTRL_I2C_Master_Mode_Transmit(Slave_Address, tx_array, 2); /* Set the EEPROM address */
+
+ delay_small(); /* Write time delay busy period */
+
+ if (Ack_Status == ACK)
+ {
+ Ack_Status = CNTRL_I2C_Master_Mode_Receive(Slave_Address, payload, qty); /* Read address */
+ }
+ return Ack_Status;
+ }
+
+
+
+/* Small 5ms delay approx */
+/* Note: Change this delay to suite the write time/busy period of the EEPROM */
+static void delay_small(void)
+{
+ uint32_t nnnn = 0;
+
+ for(nnnn = 0; nnnn < 0x6000; nnnn++)
+ {
+ ;
+ }
+}
+