STM32F429 Dead alternate function on pin?

[ricardomadera]

Posted on November 16, 2016 at 06:42

Hello,

I am trying to configure pins D0-D15 on the STM32F429VIT6 to output sram data. The code seems to be functioning properly and I have scoped out each of the pins however Pin44(PE13)-D10 seems to never go high. Configuring the pin to gpio allows it to toggle on and off. Is it possible to damage  an alternate function on a pin? Below is the GPIO init code.void SRAM_GPIOConfig(){ RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOD | RCC_AHB1Periph_GPIOE, ENABLE);  GPIO_InitTypeDef GPIO_InitStructure;  /* Common GPIO configuration */  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;  GPIO_InitStructure.GPIO_Speed = GPIO_Speed_100MHz;  GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;  GPIO_InitStructure.GPIO_PuPd  = GPIO_PuPd_NOPULL;  /* GPIOD configuration */  GPIO_PinAFConfig(GPIOD, GPIO_PinSource0, GPIO_AF_FMC);  GPIO_PinAFConfig(GPIOD, GPIO_PinSource1, GPIO_AF_FMC);  GPIO_PinAFConfig(GPIOD, GPIO_PinSource8, GPIO_AF_FMC);  GPIO_PinAFConfig(GPIOD, GPIO_PinSource9, GPIO_AF_FMC);  GPIO_PinAFConfig(GPIOD, GPIO_PinSource10, GPIO_AF_FMC);  GPIO_PinAFConfig(GPIOD, GPIO_PinSource11, GPIO_AF_FMC);  GPIO_PinAFConfig(GPIOD, GPIO_PinSource14, GPIO_AF_FMC);  GPIO_PinAFConfig(GPIOD, GPIO_PinSource15, GPIO_AF_FMC);  GPIO_InitStructure.GPIO_Pin = GPIO_Pin_0  | GPIO_Pin_1   |  GPIO_Pin_8  | GPIO_Pin_9  | GPIO_Pin_10 |                                 GPIO_Pin_11 | GPIO_Pin_14 |           GPIO_Pin_15;   GPIO_Init(GPIOD, &GPIO_InitStructure);   /* GPIOE configuration */   GPIO_PinAFConfig(GPIOE, GPIO_PinSource0 , GPIO_AF_FMC);   GPIO_PinAFConfig(GPIOE, GPIO_PinSource1 , GPIO_AF_FMC);   GPIO_PinAFConfig(GPIOE, GPIO_PinSource3 , GPIO_AF_FMC);   GPIO_PinAFConfig(GPIOE, GPIO_PinSource4 , GPIO_AF_FMC);   GPIO_PinAFConfig(GPIOE, GPIO_PinSource7 , GPIO_AF_FMC);   GPIO_PinAFConfig(GPIOE, GPIO_PinSource8 , GPIO_AF_FMC);   GPIO_PinAFConfig(GPIOE, GPIO_PinSource9 , GPIO_AF_FMC);   GPIO_PinAFConfig(GPIOE, GPIO_PinSource10 , GPIO_AF_FMC);   GPIO_PinAFConfig(GPIOE, GPIO_PinSource11 , GPIO_AF_FMC);   GPIO_PinAFConfig(GPIOE, GPIO_PinSource12 , GPIO_AF_FMC);   GPIO_PinAFConfig(GPIOE, GPIO_PinSource13 , GPIO_AF_FMC);   GPIO_PinAFConfig(GPIOE, GPIO_PinSource14 , GPIO_AF_FMC);   GPIO_PinAFConfig(GPIOE, GPIO_PinSource15 , GPIO_AF_FMC);   GPIO_InitStructure.GPIO_Pin =                                 GPIO_Pin_7  | GPIO_Pin_8  | GPIO_Pin_9  | GPIO_Pin_10 |                                 GPIO_Pin_12 | GPIO_Pin_13 | GPIO_Pin_14 |                                 GPIO_Pin_15;   GPIO_Init(GPIOE, &GPIO_InitStructure);}

[pohua]

Posted on November 16, 2016 at 06:50

Hi!

You can refer to the below FMC configuration.This code is no problem and use on LCM driverPS:I use the STM32F427 MCU.static void LCD_GPIO_Config(void){  GPIO_InitTypeDef GPIO_InitStructure;  RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOD | RCC_AHB1Periph_GPIOE , ENABLE);  GPIO_InitStructure.GPIO_Pin = GPIO_Pin_0 | GPIO_Pin_1 | GPIO_Pin_4 | GPIO_Pin_5 |                     GPIO_Pin_7 | GPIO_Pin_8 | GPIO_Pin_9 | GPIO_Pin_10 |  GPIO_Pin_11 | GPIO_Pin_14 | GPIO_Pin_15;  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;  GPIO_InitStructure.GPIO_Speed = GPIO_Speed_100MHz;  GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;  GPIO_InitStructure.GPIO_PuPd  = GPIO_PuPd_NOPULL;  GPIO_Init(GPIOD, &GPIO_InitStructure);  /*°t¸mGPIOD¬ÛÀ³ªººÞ¸}´_¥Î³s±µ¨ìFSMC*/  GPIO_PinAFConfig(GPIOD,GPIO_PinSource0,GPIO_AF_FMC);    //°t¸mGPIODªºPin0´_¥Î³s±µ¨ìFSMC D2  GPIO_PinAFConfig(GPIOD,GPIO_PinSource1,GPIO_AF_FMC); //°t¸mGPIODªºPin1´_¥Î³s±µ¨ìFSMC D3  GPIO_PinAFConfig(GPIOD,GPIO_PinSource4,GPIO_AF_FMC); //°t¸mGPIODªºPin4´_¥Î³s±µ¨ìFSMC nRD  GPIO_PinAFConfig(GPIOD,GPIO_PinSource5,GPIO_AF_FMC); //°t¸mGPIODªºPin5´_¥Î³s±µ¨ìFSMC nWR//  GPIO_PinAFConfig(GPIOD,GPIO_PinSource6,GPIO_AF_FSMC); //°t¸mGPIODªºPin5´_¥Î³s±µ¨ìFSMC nWAIT  GPIO_PinAFConfig(GPIOD,GPIO_PinSource7,GPIO_AF_FMC); //°t¸mGPIODªºPin7´_¥Î³s±µ¨ìFSMC  CS  GPIO_PinAFConfig(GPIOD,GPIO_PinSource8,GPIO_AF_FMC); //°t¸mGPIODªºPin8´_¥Î³s±µ¨ìFSMC D13  GPIO_PinAFConfig(GPIOD,GPIO_PinSource9,GPIO_AF_FMC); //°t¸mGPIODªºPin9´_¥Î³s±µ¨ìFSMC D14  GPIO_PinAFConfig(GPIOD,GPIO_PinSource10,GPIO_AF_FMC); //°t¸mGPIODªºPin10´_¥Î³s±µ¨ìFSMC D15  GPIO_PinAFConfig(GPIOD,GPIO_PinSource11,GPIO_AF_FMC); //°t¸mGPIODªºPin11´_¥Î³s±µ¨ìFSMC A16  GPIO_PinAFConfig(GPIOD,GPIO_PinSource14,GPIO_AF_FMC); //°t¸mGPIODªºPin14´_¥Î³s±µ¨ìFSMC D0  GPIO_PinAFConfig(GPIOD,GPIO_PinSource15,GPIO_AF_FMC); //°t¸mGPIODªºPin15´_¥Î³s±µ¨ìFSMC D1  GPIO_InitStructure.GPIO_Pin = GPIO_Pin_7 | GPIO_Pin_8 | GPIO_Pin_9 | GPIO_Pin_10 |                 GPIO_Pin_11 | GPIO_Pin_12 | GPIO_Pin_13 | GPIO_Pin_14 | GPIO_Pin_15;  GPIO_Init(GPIOE, &GPIO_InitStructure);  GPIO_PinAFConfig(GPIOE, GPIO_PinSource7 , GPIO_AF_FMC); //°t¸mGPIODªºPin0´_¥Î³s±µ¨ìFSMC D4  GPIO_PinAFConfig(GPIOE, GPIO_PinSource8 , GPIO_AF_FMC); //°t¸mGPIODªºPin0´_¥Î³s±µ¨ìFSMC D5  GPIO_PinAFConfig(GPIOE, GPIO_PinSource9 , GPIO_AF_FMC); //°t¸mGPIODªºPin0´_¥Î³s±µ¨ìFSMC D6  GPIO_PinAFConfig(GPIOE, GPIO_PinSource10 , GPIO_AF_FMC); //°t¸mGPIODªºPin0´_¥Î³s±µ¨ìFSMC D7  GPIO_PinAFConfig(GPIOE, GPIO_PinSource11 , GPIO_AF_FMC); //°t¸mGPIODªºPin0´_¥Î³s±µ¨ìFSMC D8  GPIO_PinAFConfig(GPIOE, GPIO_PinSource12 , GPIO_AF_FMC); //°t¸mGPIODªºPin0´_¥Î³s±µ¨ìFSMC D9  GPIO_PinAFConfig(GPIOE, GPIO_PinSource13 , GPIO_AF_FMC); //°t¸mGPIODªºPin0´_¥Î³s±µ¨ìFSMC D10  GPIO_PinAFConfig(GPIOE, GPIO_PinSource14 , GPIO_AF_FMC); //°t¸mGPIODªºPin0´_¥Î³s±µ¨ìFSMC D11  GPIO_PinAFConfig(GPIOE, GPIO_PinSource15 , GPIO_AF_FMC); //°t¸mGPIODªºPin0´_¥Î³s±µ¨ìFSMC D12}

[ricardomadera]

Posted on November 16, 2016 at 07:43

Hi Pohua!

Thanks for the quick response and the help.Here is the FMC code I am using. Any advice would be greatly appreciated.Also apologies for the two misleading FSMC names, the structs are indeed FMC.#define SRAM_INDEX_ADDR  (*((volatile unsigned short *)0x6F000000))#define SRAM_REG_ADDR  (*((volatile unsigned short *)0x6F010000))#define SRAM_MEMORY_WIDTH    FMC_NORSRAM_MemoryDataWidth_16b#define SRAM_BURSTACCESS    FMC_BurstAccessMode_Disable#define SRAM_WRITEBURST    FMC_WriteBurst_Disable#define CONTINUOUSCLOCK_FEATURE    FMC_CClock_SyncOnlyclass FMC{public: void Initialize() { RCC_AHB3PeriphClockCmd(RCC_AHB3Periph_FMC, ENABLE); FMC_NORSRAMInitTypeDef  FSMC_NORSRAMInitStructure; FMC_NORSRAMTimingInitTypeDef FSMC_NORSRAMTimingInitStructure; /* FSMC Read/Write Timing */ FSMC_NORSRAMTimingInitStructure.FMC_AddressSetupTime = 5;  /* Address Setup Time  */ FSMC_NORSRAMTimingInitStructure.FMC_AddressHoldTime = 0; FSMC_NORSRAMTimingInitStructure.FMC_DataSetupTime = 5;     /* Data Setup Time */ FSMC_NORSRAMTimingInitStructure.FMC_BusTurnAroundDuration = 0x00; FSMC_NORSRAMTimingInitStructure.FMC_CLKDivision = 0x00; FSMC_NORSRAMTimingInitStructure.FMC_DataLatency = 0x00; FSMC_NORSRAMTimingInitStructure.FMC_AccessMode = FMC_AccessMode_A; /* FSMC Access Mode */ FSMC_NORSRAMInitStructure.FMC_Bank = FMC_Bank1_NORSRAM4; FSMC_NORSRAMInitStructure.FMC_DataAddressMux = FMC_DataAddressMux_Disable; FSMC_NORSRAMInitStructure.FMC_MemoryType = FMC_MemoryType_SRAM; FSMC_NORSRAMInitStructure.FMC_MemoryDataWidth = FMC_NORSRAM_MemoryDataWidth_16b; FSMC_NORSRAMInitStructure.FMC_BurstAccessMode = FMC_BurstAccessMode_Disable; FSMC_NORSRAMInitStructure.FMC_WaitSignalPolarity = FMC_WaitSignalPolarity_Low; FSMC_NORSRAMInitStructure.FMC_WrapMode = FMC_WrapMode_Disable; FSMC_NORSRAMInitStructure.FMC_WaitSignalActive = FMC_WaitSignalActive_BeforeWaitState; FSMC_NORSRAMInitStructure.FMC_WriteOperation = FMC_WriteOperation_Enable; FSMC_NORSRAMInitStructure.FMC_WaitSignal = FMC_WaitSignal_Disable; FSMC_NORSRAMInitStructure.FMC_AsynchronousWait = FMC_AsynchronousWait_Disable; FSMC_NORSRAMInitStructure.FMC_ExtendedMode = FMC_ExtendedMode_Disable; FSMC_NORSRAMInitStructure.FMC_WriteBurst = FMC_WriteBurst_Disable; FSMC_NORSRAMInitStructure.FMC_ReadWriteTimingStruct = &FSMC_NORSRAMTimingInitStructure; FMC_NORSRAMInit(&FSMC_NORSRAMInitStructure); /* FSMC Write Timing */ FSMC_NORSRAMTimingInitStructure.FMC_AddressSetupTime = 15;//2;//1;   /* Address Setup Time */ FSMC_NORSRAMTimingInitStructure.FMC_AddressHoldTime = 0; FSMC_NORSRAMTimingInitStructure.FMC_DataSetupTime = 15;//2;//1;     /* Data Setup Time */ FSMC_NORSRAMTimingInitStructure.FMC_BusTurnAroundDuration = 0x00; FSMC_NORSRAMTimingInitStructure.FMC_CLKDivision = 0x00; FSMC_NORSRAMTimingInitStructure.FMC_DataLatency = 0x00; FSMC_NORSRAMTimingInitStructure.FMC_AccessMode = FMC_AccessMode_A; /* FSMC Access Mode */ FSMC_NORSRAMInitStructure.FMC_WriteTimingStruct = &FSMC_NORSRAMTimingInitStructure; FMC_NORSRAMInit(&FSMC_NORSRAMInitStructure); /* Enable FSMC Bank4_SRAM Bank */ FMC_NORSRAMCmd(FMC_Bank1_NORSRAM4, ENABLE); }

[ricardomadera]

Posted on November 16, 2016 at 17:05

Could this be a hardware issue with the chip itself? Trying to gauge if I should build a second prototype or continue laying the hammer on this code. I find it odd that the pin in GPIO mode works, but not in FMC.

The reset of the pins output the expected signal when setting the memory locations above.

[waclawek.jan]

Posted on November 16, 2016 at 17:43

How exactly did you observe the ''non-functioning''?

A short to neighbouring pin/track might be unobservable with a trivial test program if the other signal is inactive. Oscilloscope might reveal suspicious voltage levels in that case. Also, disconnected pin migh seem to work when measured direcly on pin, and not working when measured at the track/target devices' pin. JW

[Tesla DeLorean]

Posted on November 16, 2016 at 17:52

Could this be a hardware issue with the chip itself? 

This honestly is the least likely reason. You'd need to review the board and the netlist. Make sure there are no shorts, either at the STM32 end or the SRAM end. Review an unpopulated board. Review a board with just the STM32.If you think it is this chip, unsolder and replace with another.

[ricardomadera]

Posted on November 16, 2016 at 17:53

Hi waclawek.jan,

Thanks for your response!I observed this using my scope and measuring the individual pins. I also metered the circuit board and the trace is not shorted with neighbors and reads a good connection to its pin PE10. Only when this pin is configured as FMC does it not respond. As a GPIO it works correctly.Measuring the pin directly also reads logic low when in FMC mode. 

[ricardomadera]

Posted on November 16, 2016 at 18:08

Hi clive1,

Thank you so much for your support. Your collection of threads have been super useful in my developments.I did verify that the board is intact with proper connections and no shorts. I also checked the netlist on schematics, the trace on my pcb design, and then finally verified with the gerbers i sent out.Let me add that I am using FMC to read and write to D0-D15 for interfacing with a smart TFT panel, so I have been developing mostly with a scope and a logic analyzer.On Friday I receive the parts to build another prototype to try and replicate the issue.In the meantime, is there anything else I should do to debug further? Perhaps its a bug with the StdPeriph lib i am using?

[waclawek.jan]

Posted on November 16, 2016 at 18:23

Read back the content of relevant registers (GPIO in this case) and check.

Make sure the test program really exercises D10. Try to disconnect the load. JW

[ricardomadera]

Posted on November 16, 2016 at 18:26

I will double check the GPIO registers this today. I did verify that in GPIO mode it toggles up and down correctly with no load.