FlexCAN with DMA feature

engineer_attila — Wed, 27 Jul 2022 11:50:21 GMT

Hi folks,

I have MPC5775B based board.

I want to use Rx FIFO Transfer type to DMA mode instead of interrupt mode for FlexCAN module(or also if possible for MCAN).

I'm working over Matlab generated code.

I setuped simple MPC5775B project and try to use CAN Bus with EDMA feature(I set the FEATURE_CAN_HAS_DMA_ENABLE (1) on MPC5775B_features.h, and compile project without code regeneration)

ı got the compilation error.

>> !CAN_DMA.bat C:\Users\xxxxxx\Desktop\NXP\CAN_DMA\CAN_DMA_mbd_rtw>set MATLAB=C:\Program Files\MATLAB\R2018b C:\Users\xxxxxx\Desktop\NXP\CAN_DMA\CAN_DMA_mbd_rtw>"C:\Program Files\MATLAB\R2018b\bin\win64\gmake" -f CAN_DMA.mk GENERATE_ERT_S_FUNCTION=0 INCLUDE_MDL_TERMINATE_FCN=1 COMBINE_OUTPUT_UPDATE_FCNS=1 MULTI_INSTANCE_CODE=0 INTEGER_CODE=0 ISPROTECTINGMODEL=NOTPROTECTING Cleaning... RELATIVE_PATH_TO_ANCHOR is .. ==== Removing object files from build directory ==== Copying necessary files to build directory... Compiler details : "C:\Users\xxxxxx\AppData\Roaming\MathWorks\Add_ons\Toolboxes\NXP_MBDToolbox_MPC57xx\tools/S32DS/build_tools/powerpc-eabivle-4_9/bin/powerpc-eabivle-gcc" -DCPU_MPC5775B -mcpu=e200z7 -DSTART_FROM_FLASH --sysroot="C:\Users\xxxxxx\AppData\Roaming\MathWorks\Add_ons\Toolboxes\NXP_MBDToolbox_MPC57xx\tools/S32DS/build_tools/e200_ewl2" -g3 -mbig -mvle -O1 -mregnames -mlsp -specs=ewl_c9x.specs -mhard-float -Wall -c -std=c99 -fdata-sections -ffunction-sections -funsigned-char -fmessage-length=0 -nostdinc -fno-jump-tables -DTURN_ON_CPU0 -I. -I.. -I../instrumented -I.. -I"C:\Program Files\MATLAB\R2018b\simulink\include" -I"C:\Program Files\MATLAB\R2018b\extern\include" -I"C:\Program Files\MATLAB\R2018b\rtw\c\src" -I"C:\Program Files\MATLAB\R2018b\rtw\c\libsrc" -I"C:\Program Files\MATLAB\R2018b\rtw\c\src\ext_mode\common" -I"C:\Program Files\MATLAB\R2018b\rtw\c\src\ext_mode\tcpip" -I"C:\Program Files\MATLAB\R2018b\rtw\c\src\ext_mode\serial" -I"C:\Program Files\MATLAB\R2018b\rtw\c\src\ext_mode\custom" -IC:\Users\xxxxxx\Desktop\NXP\CAN_DMA -IC:\Users\xxxxxx\Desktop\NXP\CAN_DMA\CAN_DMA_mbd_rtw -IC:\PROGRA~1\MATLAB\R2018b\extern\include -IC:\PROGRA~1\MATLAB\R2018b\simulink\include -IC:\PROGRA~1\MATLAB\R2018b\rtw\c\src -IC:\PROGRA~1\MATLAB\R2018b\rtw\c\src\ext_mode\common -IC:\PROGRA~1\MATLAB\R2018b\rtw\c\ert -I"C:\Users\xxxxxx\AppData\Roaming\MathWorks\Add_ons\Toolboxes\NXP_MBDToolbox_MPC57xx\tools/S32DS/build_tools/e200_ewl2/EWL_C/include" -I"C:\Users\xxxxxx\AppData\Roaming\MathWorks\Add_ons\Toolboxes\NXP_MBDToolbox_MPC57xx\tools/S32DS/build_tools/e200_ewl2/EWL_C/include/pa" -I"./common" -I"./inc" -I"./src/clock/MPC57xx" -I"./src/clock/MPC5777C" -I"./src/sim/MPC5775B" -I"./src/power/MPC57xx" -I"./src/pins/siul2" -I"./src/pins/siu" -I"./MPC5775B/include" -I"../common" -I"../inc" -I"../src/clock/MPC57xx" -I"../src/clock/MPC5777C" -I"../src/sim/MPC5775B" -I"../src/power/MPC57xx" -I"../src/pins/siul2" -I"../src/pins/siu" -I"../MPC5775B/include" -I"../instrumented/common" -I"../instrumented/inc" -I"../instrumented/src/clock/MPC57xx" -I"../instrumented/src/sim/MPC5775B" -I"../instrumented/src/power/MPC57xx" -I"../instrumented/src/pins/siul2" -I"../instrumented/MPC5775B/include" Assembler details : "C:\Users\xxxxxx\AppData\Roaming\MathWorks\Add_ons\Toolboxes\NXP_MBDToolbox_MPC57xx\tools/S32DS/build_tools/powerpc-eabivle-4_9/bin/powerpc-eabivle-gcc" -c -g3 -mbig -mvle -mregnames -DTURN_ON_CPU0 Product: CAN_DMA.mot Build product type: executable Building file core0_intc_sw_handlers.o... "C:\Users\xxxxxx\AppData\Roaming\MathWorks\Add_ons\Toolboxes\NXP_MBDToolbox_MPC57xx\tools/S32DS/build_tools/powerpc-eabivle-4_9/bin/powerpc-eabivle-gcc" -c -g3 -mbig -mvle -mregnames -DTURN_ON_CPU0 -I.. -o core0_intc_sw_handlers.o core0_intc_sw_handlers.S Building file interrupt_vectors.o... "C:\Users\xxxxxx\AppData\Roaming\MathWorks\Add_ons\Toolboxes\NXP_MBDToolbox_MPC57xx\tools/S32DS/build_tools/powerpc-eabivle-4_9/bin/powerpc-eabivle-gcc" -c -g3 -mbig -mvle -mregnames -DTURN_ON_CPU0 -I.. -o interrupt_vectors.o interrupt_vectors.S Building file startup_MPC5775B.o... "C:\Users\xxxxxx\AppData\Roaming\MathWorks\Add_ons\Toolboxes\NXP_MBDToolbox_MPC57xx\tools/S32DS/build_tools/powerpc-eabivle-4_9/bin/powerpc-eabivle-gcc" -c -g3 -mbig -mvle -mregnames -DTURN_ON_CPU0 -I.. -o startup_MPC5775B.o startup_MPC5775B.S Building file CAN_DMA.o... "C:\Users\xxxxxx\AppData\Roaming\MathWorks\Add_ons\Toolboxes\NXP_MBDToolbox_MPC57xx\tools/S32DS/build_tools/powerpc-eabivle-4_9/bin/powerpc-eabivle-gcc" -DCPU_MPC5775B -mcpu=e200z7 -DSTART_FROM_FLASH --sysroot="C:\Users\xxxxxx\AppData\Roaming\MathWorks\Add_ons\Toolboxes\NXP_MBDToolbox_MPC57xx\tools/S32DS/build_tools/e200_ewl2" -g3 -mbig -mvle -O1 -mregnames -mlsp -specs=ewl_c9x.specs -mhard-float -Wall -c -std=c99 -fdata-sections -ffunction-sections -funsigned-char -fmessage-length=0 -nostdinc -fno-jump-tables -DTURN_ON_CPU0 -I. -I.. -I../instrumented -I.. -I"C:\Program Files\MATLAB\R2018b\simulink\include" -I"C:\Program Files\MATLAB\R2018b\extern\include" -I"C:\Program Files\MATLAB\R2018b\rtw\c\src" -I"C:\Program Files\MATLAB\R2018b\rtw\c\libsrc" -I"C:\Program Files\MATLAB\R2018b\rtw\c\src\ext_mode\common" -I"C:\Program Files\MATLAB\R2018b\rtw\c\src\ext_mode\tcpip" -I"C:\Program Files\MATLAB\R2018b\rtw\c\src\ext_mode\serial" -I"C:\Program Files\MATLAB\R2018b\rtw\c\src\ext_mode\custom" -IC:\Users\xxxxxx\Desktop\NXP\CAN_DMA -IC:\Users\xxxxxx\Desktop\NXP\CAN_DMA\CAN_DMA_mbd_rtw -IC:\PROGRA~1\MATLAB\R2018b\extern\include -IC:\PROGRA~1\MATLAB\R2018b\simulink\include -IC:\PROGRA~1\MATLAB\R2018b\rtw\c\src -IC:\PROGRA~1\MATLAB\R2018b\rtw\c\src\ext_mode\common -IC:\PROGRA~1\MATLAB\R2018b\rtw\c\ert -I"C:\Users\xxxxxx\AppData\Roaming\MathWorks\Add_ons\Toolboxes\NXP_MBDToolbox_MPC57xx\tools/S32DS/build_tools/e200_ewl2/EWL_C/include" -I"C:\Users\xxxxxx\AppData\Roaming\MathWorks\Add_ons\Toolboxes\NXP_MBDToolbox_MPC57xx\tools/S32DS/build_tools/e200_ewl2/EWL_C/include/pa" -I"./common" -I"./inc" -I"./src/clock/MPC57xx" -I"./src/clock/MPC5777C" -I"./src/sim/MPC5775B" -I"./src/power/MPC57xx" -I"./src/pins/siul2" -I"./src/pins/siu" -I"./MPC5775B/include" -I"../common" -I"../inc" -I"../src/clock/MPC57xx" -I"../src/clock/MPC5777C" -I"../src/sim/MPC5775B" -I"../src/power/MPC57xx" -I"../src/pins/siul2" -I"../src/pins/siu" -I"../MPC5775B/include" -I"../instrumented/common" -I"../instrumented/inc" -I"../instrumented/src/clock/MPC57xx" -I"../instrumented/src/sim/MPC5775B" -I"../instrumented/src/power/MPC57xx" -I"../instrumented/src/pins/siul2" -I"../instrumented/MPC5775B/include" -o CAN_DMA.o CAN_DMA.c In file included from devassert.h:22:0, from device_registers.h:411, from CAN_DMA.h:24, from CAN_DMA.c:17: C:\Users\xxxxxx\AppData\Roaming\MathWorks\Add_ons\Toolboxes\NXP_MBDToolbox_MPC57xx\tools/S32DS/build_tools/e200_ewl2/EWL_C/include/stdbool.h:45:0: warning: "true" redefined #define true 1 ^ In file included from CAN_DMA.h:23:0, from CAN_DMA.c:17: rtwtypes.h:27:0: note: this is the location of the previous definition # define true (1U) ^ In file included from devassert.h:22:0, from device_registers.h:411, from CAN_DMA.h:24, from CAN_DMA.c:17: C:\Users\xxxxxx\AppData\Roaming\MathWorks\Add_ons\Toolboxes\NXP_MBDToolbox_MPC57xx\tools/S32DS/build_tools/e200_ewl2/EWL_C/include/stdbool.h:46:0: warning: "false" redefined #define false 0 ^ In file included from CAN_DMA.h:23:0, from CAN_DMA.c:17: rtwtypes.h:23:0: note: this is the location of the previous definition # define false (0U) ^ In file included from CAN_DMA.h:27:0, from CAN_DMA.c:17: flexcan_hw_access.h: In function 'FLEXCAN_SetRxFifoDMA': flexcan_hw_access.h:1208:31: error: 'CAN_MCR_DMA_MASK' undeclared (first use in this function) base->MCR = (base->MCR & ~CAN_MCR_DMA_MASK) | CAN_MCR_DMA(enable? 1UL : 0UL); ^ flexcan_hw_access.h:1208:31: note: each undeclared identifier is reported only once for each function it appears in flexcan_hw_access.h:1208:5: warning: implicit declaration of function 'CAN_MCR_DMA' [-Wimplicit-function-declaration] base->MCR = (base->MCR & ~CAN_MCR_DMA_MASK) | CAN_MCR_DMA(enable? 1UL : 0UL); ^ CAN_DMA.c: In function 'CAN_DMA_initialize': CAN_DMA.c:126:62: warning: passing argument 3 of 'FLEXCAN_DRV_ConfigRxFifo' from incompatible pointer type FLEXCAN_DRV_ConfigRxFifo(0, FLEXCAN_RX_FIFO_ID_FORMAT_A, &id_filter_table); ^ In file included from CAN_DMA.h:26:0, from CAN_DMA.c:17: flexcan_driver.h:716:6: note: expected 'const struct flexcan_id_table_t *' but argument is of type 'struct flexcan_id_table_t (*)[8]' void FLEXCAN_DRV_ConfigRxFifo( ^ gmake: *** [CAN_DMA.o] Error 1 >>

I also try same configuration on s32 Power Studio i couldn't change the Configuration List "RX FIFO Transfer type" Using Interrupts to Using DMA.

when i insert the below code on the MPC5775B.h within CAN MCR macros

#define CAN_MCR_DMA_MASK 0x8000u #define CAN_MCR_DMA_SHIFT 15u #define CAN_MCR_DMA_WIDTH 1u #define CAN_MCR_DMA(x) (((uint32_t)(((uint32_t)(x))<<CAN_MCR_DMA_SHIFT))&CAN_MCR_DMA_MASK)

The error is disappear, but i'm not sure this is proper way to use DMA with FlexCAN

How can i use DMA mode instead of interrupts mode for MBDT based MPC5775B projects?

Regards,
Attila.

Re: FlexCAN with DMA feature

peter09 — Mon, 11 Aug 2025 05:06:53 GMT

have you solved these ?

Model-Based Design Toolbox (MBDT)のトピックFlexCAN with DMA feature

FlexCAN with DMA feature

Re: FlexCAN with DMA feature