Porting ioLibrary_Driver to PIC24 using CCS PCD compiler

Question

Four years ago, we ported the basic ioLibrary_Driver code for W5500 to the PIC24 using the CCS PCD compiler. I just re-ported the current code. I had to change a few things to work around limitations in the CCS compiler. For example, passing a function pointer does not work. There is a workaround. Each function pointer gets made into a typedef. From the Ethernet library, here are examples: typedef void(*CRIS_EN)(void); typedef void(*CRIS_EX)(void); typedef void(*CS_SEL)(void); typedef void(*CS_DESEL)(void); typedef iodata_t(*BUS_RB)(uint32_t addr); typedef void(*BUS_WB)(uint32_t addr, iodata_t wb); typedef uint8_t(*SPI_RB)(void); typedef void(*SPI_WB)(uint8_t wb); typedef void(*SPI_RBB)(uint8_t* pBuf, uint16_t len); typedef void(*SPI_WBB)(uint8_t* pBuf, uint16_t len); typedef void(*VOIDPTR)(void); typedef void(*BUSBUF_RB)(uint32_t AddrSel, iodata_t* pBuf, int16_t len, uint8_t addrinc); typedef void(*BUSBUF_WB)(uint32_t AddrSel, iodata_t* pBuf, int16_t len, uint8_t addrinc); typedef void(*QSPI_RB)(uint8_t opcode, uint16_t addr, uint8_t* pBuf, uint16_t len); typedef void(*QSPI_WB)(uint8_t opcode, uint16_t addr, uint8_t* pBuf, uint16_t len); Then functions like this: void reg_wizchip_cris_cbfunc(void(*cris_en)(void), void(*cris_ex)(void)) { ...get changed into this: void reg_wizchip_cris_cbfunc(CRIS_EN cris_en, CRIS_EX cris_ex) { This makes the CCS compiler happy. This typedef workaround seems to work without issue on a "real" compiler (I tested it on the Online GDB compiler). I have started porting the httpServer, but it has many more things to change. First, quoted strings like "This" do not work as function parameters, so the CCS PCD compiler has a way to copy them into RAM automatically and then they work: #device PASS_STRINGS=IN_RAM I also had to deal with the use of "const" which behaves differently in this compiler/architecture: */ } else if (strcmp((const char *)uri_name, "example.cgi") == 0) { */ } else if (strcmp((char *)uri_name, "example.cgi") == 0) { Removing them allows it to get past the compiler error. I have not been able to build the httpServer yet, and wanted to post this here in case anyone had already figured all this out. I think my project will need: web server smtp e-mail sending The SMTP looks like it wants plaintext/open servers, which our IT department told me we cannot have and they are not supported. This means I may have to do more work to get this going. Anyone worked on this before?

allenhuffman · Answer

Thank you, Aimee0. At the time of my post, I was unaware of this method. In an earlier project we modified the library and I was doing the same. I have now created wrapper functions. I began using the CCS compiler, but it was having problems with the HTTPServer example code. To make things easier for that, I switched to trying the MPLAB compiler. That made the process easier for both the I/O library and things like HTTP, SNMP, etc. For any others doing this ... my wrapper basically looked like this (CCS code commented out, MPLAB code being used. I was never able to get everything running with CCS before I switched.) Does Wiznet provide any stub file that has a similar wrapper? That would have been a very useful starting point. #ifndef WIZENETWRAPPER_C #define WIZENETWRAPPER_C #include "wizchip_conf.h" #include "WiznetWrapper.h" bool WiznetWrapper_init (void) { bool status = false; // Reset the Wiznet chip. //output_low (W5500_RESET_PIN); // RSTn LOW W5500_RESET_SetLow (); // RSTn LOW //delay_ms (1); // Min 500us __delay_ms (1); // Min 500us //output_high (W5500_RESET_PIN); // Ensure reset line is not floating. W5500_RESET_SetHigh (); // Ensure reset line is not floating. //delay_ms (1); // 1ms Max to PLOCFK __delay_ms (1); // 1ms Max to PLOCFK // Use our interrupt disable/enable functions. reg_wizchip_cris_cbfunc (WiznetWrapper_cris_enter, WiznetWrapper_cris_exit); // Use our chip select functions. reg_wizchip_cs_cbfunc (WiznetWrapper_cs_select, WiznetWrapper_cs_deselect); // Use our read byte/write byte functions. reg_wizchip_spi_cbfunc (WiznetWrapper_spi_readbyte, WiznetWrapper_spi_writebyte); // Use our read burst/write burst functions. reg_wizchip_spiburst_cbfunc (WiznetWrapper_spi_readburst, WiznetWrapper_spi_writeburst); if (spi1_open(0)) // MODE0 ? { status = true; } else // Failed { status = false; } return status; } void WiznetWrapper_cris_enter (void) { //disable_interrupts (GLOBAL); //__builtin_disi(0x3FFF); // Disable interrupts globally…