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// Loop Until End of Program received do { StoreOffset = 0; do { while (!CharReady); DataChar = UARTRead(); if ((LF != DataChar) && (44 > StoreOffset)) DataBuffer[StoreOffset++] = DataChar; until (CR == DataChar) printf(XOFF); // No Rx while data processed
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// Make Data into Hex for (i = j = 1; j < StoreOffset; i++, j += 2) DataBuffer[i] = (MakeHex(DataBuffer[j]) * 16) + MakeHex(DataBuffer[j + 1]); StoreOffset = i; // Compress data
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// Need At Least 9 Compressed Characters in Line if (9 > StoreOffset) ProgramGood = 0; else if ((0 == ProgramGood) || // Skip to end if bad program (04 == DataBuffer[5]) || // Skip Over First Line (01 == DataBuffer[5])) // Skip Over Last Line { for (CheckSum = 0, i = 1; 0xFF != DataBuffer[i]; i +=1) CheckSum += DataBuffer[i]; InsNum = DataBuffer[1] / 2; Address = DataBuffer[2:3] / 2; // Store in an instruction buffer for (i = 0; i < 3; i++) InsBuffer[i] = 0x3FFFF; // Skip if Con g, IDLOCS or Data EEPROM if (0x2000 <= Address) if (( : != DataBuffer[0]) || // Stop if Error (0 != CheckSum) || (BootLoaderCodeStart <= (Address + InsNum))) ProgramGood = 0; else { // Program in Line of Data for (i = (Address & 3), j = 0; (j < 4) & (i < InsNum); i++, j += 2) InsBuffer[i] = DataBuffer[5 + j:6 + j]; for (k = 0; k < 4; ki++) ProgramIns(Address & 0x1FFC, InsBuffer[k]); if (InsNum > (Address + 4)) { // Do Upper Bytes for (; (i < InsNum); i++, j += 2) InsBuffer[i] = DataBuffer[5 + j:6 + j]; for (k = 0; k < 4; ki++) ProgramIns(Address & 0x1FFC, InsBuffer[k]); } // } // printf(XON); } // } until (01 == DataBuffer[4]) if (ProgramGood) { printf( Pass\n ); ProgramIns(TestFlag, 0); } else {
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printf( Fail\n ); ProgramIns(TestFlag, 0x3FFF); } // } until (ProgramGood) //
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goto StartVector; } // niam
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Start Executing
The goto StartVector; statement is not a lapse away from structured programming principles. It is the jump to the application s four statements at address 0x0 that was discussed in the preceding section. If this application was to be ported to C, then this statement would have to be manually converted to the suggested assemblylanguage statements. This bootloader application allows downloading of applications very ef ciently, and I have not seen a failure in the download process. This tool could be ported to the PIC18 architecture quite easily, with the only changes being to support the different program memory model and placing the buffer variables in a different bank from what the application would be expected to use.
PIC18 Bootloaders
Implementing a PIC18 bootloader has many of the same issues as the mid-range chips, but there are some unique situations that you should be aware of. Obviously, the differences in the program memory and register architecture are things that you are going to have to understand, but there are also interfaces that are available on the PIC18 that aren t available in other devices, as well as the ability to implement a real-time operating system (RTOS, which is discussed in Chap. 13) that will affect your use model and what kind of capabilities you are going to build into your system. While this is common in many other microcontrollers, the PIC18C601 and PIC18C801 are the only members of the PIC microcontroller family that are shipped without any memory. These chips are designed to be driven by external parallel Flash chips, and implementing a bootloader in them is accomplished in a rather unusual manner, relying on 1.5 kBs of SRAM that is located in the PIC microcontroller itself that can be accessed either as le registers or as program memory. This SRAM, generally known as BootRAM, is used to store the bootloader program while the Flash is being updated. The process of downloading a new application in the PIC18C601/PIC18C801 using a bootloader is as follows:
1 On startup, have a recognized bootloader application load indicator active. 2 Con gure BootRAM as le registers.
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