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The first line in Table 6.1 should read “64k x 8-bit data” (not 640 x 8-bit).

[Thanks to Javier Vega]

There are some errors in Figure 7.11.

[Thanks to Javier Vega]

In Figure 8.6 the capacitor in the snubber is not shown (although the label is present).

[Thanks to Yeow Heng Seow]

On the third line, the code should read:

[code lang=”c” linenumbers=”off”] unsigned int Timeout_loop = 0; [/code]

The code on the CD is a later (and better) version than that reproduced in the book.

[Thanks to Chisanga Mwelwa]

Figure 23.4 shows a DS1621 (incorrectly labelled 24C64).

[Thanks to Tim Edwards and Balasubramanya Bellur Hiriyannaiah]

I have confused the IDs for “slaves” and “previous slaves” in this code section.

The correct version is as follows:

[code lang=”c”] // Check that the appropriate slave responded to the previous message: // (if it did, store the data sent by this slave) if (SCC_A_MASTER_Process_Ack(Previous_slave_index) == RETURN_ERROR) { Error_code_G = ERROR_SCH_LOST_SLAVE; Network_error_pin = NETWORK_ERROR;

// If we have lost contact with a slave, we attempt to // switch to a backup device (if one is available) if (Current_Slave_IDs_G[Previous_slave_index] != BACKUP_SLAVE_IDs[Previous_slave_index]) { // There is a backup available: switch to backup and try again Current_Slave_IDs_G[Previous_slave_index] = BACKUP_SLAVE_IDs[Previous_slave_index]; } else { // There is no backup available (or we are already using it) // Try main device. Current_Slave_IDs_G[Previous_slave_index] = MAIN_SLAVE_IDs[Previous_slave_index]; }

// Try to connect to the slave Slave_replied_correctly = SCC_A_MASTER_Start_Slave(Current_Slave_IDs_G[Previous_slave_index]);

if (!Slave_replied_correctly) { // No backup available (or backup failed too) - we shut down // OTHER BEHAVIOUR MAY BE MORE APPROPRIATE IN YOUR APPLICATION SCC_A_MASTER_Shut_Down_the_Network(); } }

// Send ‘tick’ message to all connected slaves // (sends data to the current slave) SCC_A_MASTER_Send_Tick_Message(Slave_index_G); [/code]

[Thanks to Trent Lillehaugen]

The last line of the example code:

[code lang=”c” linenumbers=”off”] printf(“Original data is %f\n”, X.Float); [/code]

should read:

[code lang=”c” linenumbers=”off”] printf(“Transferred data is %f\n”, Y.Float); [/code]

[Thanks to Chisanga Mwelwa and Andrew Norman]

There is an error in the file “Port.H” The file should read as follows:

[code lang=”c”] /—————————————————————————————————-

Port.H (v1.00)

‘Port Header’ (see Chap 10) for project SPI_ADC (see Chap 32)

-—————————————————————————————————/

// ——— SPI_Core.C ———————————————————————-

// Create sbits for all required chip selects here

sbit SPI_CS = P1^3; // ***** NB ******

// NOTE: pins P1.4, P1.5, P1.6 and P1.7 also used - see text

/—————————————————————————————————-

—— END OF FILE ————————————————————————-

-—————————————————————————————————/ [/code]

[Thanks to John Moyer]

The circuit diagrams in Figure 32.11, Figure 32.12 and Figure 32.13 have the positive and negative terminals of the op amps reversed.

[Thanks to Trent Lillehaugen]

In Figure 35.9, the box should be labelled “Closed-loop controller” (not “Open-loop controller”).

[Thanks to John Moyer]

John correctly spotted that the description of the technique used to calculate the sample rate (based on the system rise time) contains an arithmetic error.

In addition, the equation on p.871 provides a sample rate that is close to the minimum required to ensure stability for many systems.

To solve both problems, the text beginning “Having determined the rise time …” (at the bottom of p.871) through to the start of the “Hardware Resources” section (on p.873) will be more useful if replaced with the following:

Having determined the rise time (measured in seconds), we can approximate the required sample rate as follows:

Sample rate (Hz) = 40 / Rise time (seconds)

Thus, if the rise time measured in Figure 35-11 was 0.1 second, the required sample frequency would be around 400 Hz.

Please note that this value is approximate, and involves several assumptions about the nature of the system. See Franklin et al. (1994), for further details.