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STM32F152 question

I'm setting up a new project on an STM32F152, and and having a problem with the wakeup timer of the RTC. It seems to be running, setting the interrupt flag, and the interrupt is enabled, but not jumping to the handler. I'm using IAR's toolkit. The code looks like this:

SCB->VTOR = 0x08000000; RCC->CR |= (uint32_t)0x00000100;

/*!< Reset SW[1:0], HPRE[3:0], PPRE1[2:0], PPRE2[2:0], MCOSEL[2:0] and MCOPRE[2:0] bits */

RCC->CFGR &= (uint32_t)0x88FFC00C;

/*!< Reset HSION, HSEON, CSSON and PLLON bits */ RCC->CR &= (uint32_t)0xEEFEFFFE;

/*!< Reset HSEBYP bit */ RCC->CR &= (uint32_t)0xFFFBFFFF;

/*!< Reset PLLSRC, PLLMUL[3:0] and PLLDIV[1:0] bits */ RCC->CFGR &= (uint32_t)0xFF02FFFF;

/*!< Disable all interrupts */ RCC->CIR = 0x00000000;

/*!< Configure the System clock frequency, HCLK, PCLK2 and PCLK1 prescalers */

/*!< Configure the Flash Latency cycles and enable prefetch buffer */ // SetSysClock();

RCC->APB1ENR |= (1 CR |= (1 CSR |= (1 CSR & (1 CSR |= (1 WRP = 0xCA; RTC->WRP = 0x53; RTC->CR &= ~RTC_CR_WUTE; // enable wake up timer while ((RTC->ISR & RTC_ISR_WUTWF) == 0) ; RTC->WUTR = 10000; // play with this when we know what we need; RTC->CR &= ~(RTC_CR_WUCKSEL_2); RTC->CR |= RTC_CR_WUCKSEL_0 | RTC_CR_WUCKSEL_1; // RTC/16 RTC->ISR &= ~RTC_ISR_WUTF; RTC->CR |= RTC_CR_WUTE; // enable wake up timer RCC->CSR |= RCC_CSR_RTCEN; // enable RTC as well. RTC->WRP = 0xFF ;

And when I look at the registers while running, I see that

RTC_CR = 0x00004403 which means, among other things WUTE and WUTIE are high. I can also watch RTC_ISR->WUTF transition from low to high.

I have a handler defined at RTC_WKUP_IRQHandler, but it's not happening.

Anything I'm forgetting?

Thanks.

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Reply to
sburck
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I'm not familiar with that particular processor, but it looks like you've just set up the real time clock -- is there some global interrupt enable that has to be set, or some bit in the central interrupt hardware (whatever it's called on that processor)?

Certainly if it were an ARM Cortex part you'd be missing an enable bit in the NVIC.

--
Tim Wescott
Control system and signal processing consulting
www.wescottdesign.com
Reply to
Tim Wescott

Found it a while back and thought I'd come here and close this. All the devices on this need to be given a clock, and I didn't give it one.

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Reply to
sburck

The lovely (ha!) thing about embedded processors is that quite often missing just a single bit in an obscure register is enough to "break" them. I wouldn't be surprised to learn that many (most?) STM32 "bare metal" developers were caught by this.

For the most part, the datasheets, user's guides, and/or reference manuals are pretty darned good both in coverage and correctness. But it sure would be nice if manufacturers included a "quick start" section that mentioned all of the "oh by the ways."

--
Rich Webb     Norfolk, VA
Reply to
Rich Webb

Rich Webb wrote:

Actually, for the F4's I've found that voluminous comments in the .c files for the peripheral drivers provide a lot of that. It took me a while to find them. Stuff like

  • =================================================================== * How to use this driver * =================================================================== * 1. Enable peripheral clock using the follwoing functions * RCC_APB2PeriphClockCmd(RCC_APB2Periph_USARTx, ENABLE) for USART1 and USART6 * RCC_APB1PeriphClockCmd(RCC_APB1Periph_USARTx, ENABLE) for USART2, USART3, UART4 or UART5. * * 2. According to the USART mode, enable the GPIO clocks using * RCC_AHB1PeriphClockCmd() function. (The I/O can be TX, RX, CTS, * or/and SCLK). * * 3. Peripheral's alternate function: * - Connect the pin to the desired peripherals' Alternate * Function (AF) using GPIO_PinAFConfig() function * - Configure the desired pin in alternate function by: * GPIO_InitStruct->GPIO_Mode = GPIO_Mode_AF * - Select the type, pull-up/pull-down and output speed via * GPIO_PuPd, GPIO_OType and GPIO_Speed members * - Call GPIO_Init() function * * 4. Program the Baud Rate, Word Length , Stop Bit, Parity, Hardware * flow control and Mode(Receiver/Transmitter) using the USART_Init() * function. * * 5. For synchronous mode, enable the clock and program the polarity, * phase and last bit using the USART_ClockInit() function. * * 5. Enable the NVIC and the corresponding interrupt using the function * USART_ITConfig() if you need to use interrupt mode. * * 6. When using the DMA mode * - Configure the DMA using DMA_Init() function * - Active the needed channel Request using USART_DMACmd() function * * 7. Enable the USART using the USART_Cmd() function. * * 8. Enable the DMA using the DMA_Cmd() function, when using DMA mode. * * Refer to Multi-Processor, LIN, half-duplex, Smartcard, IrDA sub-sections * for more details * * In order to reach higher communication baudrates, it is possible to * enable the oversampling by 8 mode using the function USART_OverSampling8Cmd(). * This function should be called after enabling the USART clock (RCC_APBxPeriphClockCmd()) * and before calling the function USART_Init().

for the USART. It's not always this good -- I'm fighting with I2C now.

Mel.

Reply to
Mel Wilson

The TI/Luminary parts make that error easy to find by giving you a general bus fault when you try to access a peripheral that's not yet clocked.

At least it's easier to find the _second_ time you run into it.

In its way, quietly passing the thing over is just as bad -- but at least while you pull out the same amount of hair over the problem, you do so over a longer period.

--
Tim Wescott
Control system and signal processing consulting
www.wescottdesign.com
Reply to
Tim Wescott

Add me to the list. I'd never run across such a requirement before, even for GPIO pins.

Reply to
mjsilva

I'm right now porting my modestly large (~200K lines) bare-metal application to the F4.

The current stage is reading all manuals and datasheets. Which example code did you excerpted that from?

- Jonny

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Reply to
Jonny Doin

It's from the firmware for the STM32F4-DISCOVERY board.

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Inside the .zip, look for Libraries/STM32F4xx_StdPeriph_Driver/src . I was quoting from stm32f4xx_usart.c .

Mel.

Reply to
Mel Wilson

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