Ich nochmal:
Zum Thema Bootloadereinstellungen, wenn main.c (aus
Bootloader_SW_022409)mit XT 7,2738MHz im Original so aussieht
1 | #include "p30fxxxx.h"
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2 |
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3 |
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4 | //Defines for System Clock Timing -
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5 | //For oscillator configuration XT x PLL8 mode,
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6 | //Device Throughput in MIPS = Fcy = 7372800*8/4 = ~14.74 MIPS
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7 | //Instruction Cycle time = Tcy = 1/(Fcy) = ~68 nanoseconds
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8 |
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9 | #define XTFREQ 7372800 //On-board Crystal frequency
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10 | #define PLLMODE 8 //On-chip PLL setting
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11 | #define FCY XTFREQ*PLLMODE/4 //Instruction Cycle Frequency
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12 |
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13 | #define BAUDRATE 115200
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14 | #define BRGVAL ((FCY/BAUDRATE)/16)-1
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15 |
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16 | #define COMMAND_NACK 0x00
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17 | #define COMMAND_ACK 0x01
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18 | #define COMMAND_READ_PM 0x02
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19 | #define COMMAND_WRITE_PM 0x03
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20 | #define COMMAND_READ_EE 0x04
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21 | #define COMMAND_WRITE_EE 0x05
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22 | #define COMMAND_READ_CM 0x06
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müßte ich dann den Code mit einem 20MHz Quarz (HS) so schreiben
1 | #include "p30fxxxx.h"
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2 |
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3 |
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4 | //Defines for System Clock Timing -
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5 | //For oscillator configuration XT x PLL8 mode,
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6 | //Device Throughput in MIPS = Fcy = 7372800*8/4 = ~14.74 MIPS
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7 | //Instruction Cycle time = Tcy = 1/(Fcy) = ~68 nanoseconds
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8 |
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9 | #define HS 20000000 //On-board Crystal frequency
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10 | //#define PLLMODE 8 //On-chip PLL setting
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11 | #define FCY HS/4 //Instruction Cycle Frequency
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12 |
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13 | #define BAUDRATE 115200
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14 | #define BRGVAL ((FCY/BAUDRATE)/16)-1
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15 |
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16 | #define COMMAND_NACK 0x00
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17 | #define COMMAND_ACK 0x01
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18 | #define COMMAND_READ_PM 0x02
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19 | #define COMMAND_WRITE_PM 0x03
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20 | #define COMMAND_READ_EE 0x04
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21 | #define COMMAND_WRITE_EE 0x05
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22 | #define COMMAND_READ_CM 0x06
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23 | #define COMMAND_WRITE_CM 0x07
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24 | #define COMMAND_RESET 0x08
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Und ist das das einzige was ich ändern muß und muß ich das Programm das
ich später über den Bootloader laden will noch verändern?
Gruß
Andi
