STM32F0 Discovery Reading ts_cal1 and ts_cal2 from system memory

[RomainR.]

Posted on June 20, 2013 at 22:30

Hi,

I

'm desperate to not achieve my project with

the

internal

temperature

sensor

of

STM32F0

For now I

try to read

the

sensor

factory

calibration

data

stored in the

system memory

by simple

pointer

that way.

(53) uint16_t ts_cal1, ts_cal2; (54) ts_cal1 = *(uint16_t*)(0x1FFFF7B8); (55) ts_cal2 = *(uint16_t*)(0x1FFFF7C2); The KEIL compiler does not

appreciate

...

..\main.c(55): error:  &sharp77-D: this declaration has no storage class or type specifier ..\main.c(55): error:  &sharp28: expression must have a constant value

Do

you have any advice

or

tell me what

I forgot

?

Also,

is

that

one

of you

has already managed

to use

the formula in the

datasheet

Temperature

(in

� C) =

{

(

V25

-

VSENSE

)

/

Avg_Slope

}

+

25

? Thanks. #internal-temperature-sensor #internal-temperature-sensor

[Tesla DeLorean]

Posted on June 20, 2013 at 22:49

It probably doesn't like the way you have the parenthesis

[DEAD LINK /public/STe2ecommunities/mcu/Lists/cortex_mx_stm32/Flat.aspx?RootFolder=/public/STe2ecommunities/mcu/Lists/cortex_mx_stm32/Internal%20temperatur%20sensor&FolderCTID=0x01200200770978C69A1141439FE559EB459D7580009C4E14902C3CDE46A77F0FFD06506F5B&currentviews=154]https://my.st.com/public/STe2ecommunities/mcu/Lists/cortex_mx_stm32/Flat.aspx?RootFolder=%2Fpublic%2FSTe2ecommunities%2Fmcu%2FLists%2Fcortex_mx_stm32%2FInternal%20temperatur%20sensor&FolderCTID=0x01200200770978C69A1141439FE559EB459D7580009C4E14902C3CDE46A77F0FFD06506F5B¤tviews=154

[RomainR.]

Posted on June 21, 2013 at 08:35

By this way. It seems to be OK. No build error. I need to check with the HW now

#define ts_cal1 = *((uint16_t*) 0x1FFFF7B8); #define ts_cal2 = *((uint16_t*) 0x1FFFF7C2); Thank Clive1

[RomainR.]

Posted on June 23, 2013 at 17:38

Internal Temperature sensorwork fine on STM32F0 Discovery. Here the code to save time.

/* Includes ------------------------------------------------------------------*/

#include ''stm32f0xx.h'' 

#include ''stm32f0_discovery.h'' 


/* Private typedef -----------------------------------------------------------*/

/* Private define ------------------------------------------------------------*/

#define TS_CAL1 *((uint16_t*) 0x1FFFF7B8) // TS_CAL1 = 1767 

#define TS_CAL2 *((uint16_t*) 0x1FFFF7C2) // TS_CAL2 = 1343 

#define AVG_SLOPE (float)((TS_CAL1 - TS_CAL2)/0) 


/* Private variables ---------------------------------------------------------*/

static
volatile
uint32_t TimingDelay; 

uint32_t 
clock
=0; 

const
uint16_t V25 = 1963; 
// V25=1.43V at ref 3.0V 

uint16_t VSense; 

float
Temp; 


/* Private function prototypes -----------------------------------------------*/

void
TimingDelay_Decrement(
void
); 

void
Delay(__IO uint32_t nTime); 

void
Int_Temp_Sensor_Config(
void
); 

float
Get_Int_Temp(
void
); 


/* Private functions ---------------------------------------------------------*/


void
Int_Temp_Sensor_Config(
void
) 

{ 

ADC_InitTypeDef ADC_InitStructure; 

ADC_StructInit(&ADC_InitStructure); 


RCC_APB2PeriphClockCmd(RCC_APB2Periph_ADC1, ENABLE); 


ADC_DeInit(ADC1); 

ADC_InitStructure.ADC_ContinuousConvMode = ENABLE; 

ADC_InitStructure.ADC_DataAlign = ADC_DataAlign_Right; 

ADC_InitStructure.ADC_Resolution = ADC_Resolution_12b; 

ADC_InitStructure.ADC_ScanDirection = ADC_ScanDirection_Upward; 

ADC_InitStructure.ADC_ExternalTrigConvEdge = ADC_ExternalTrigConvEdge_None; 

ADC_Init(ADC1, &ADC_InitStructure); 

ADC_ChannelConfig(ADC1, ADC_Channel_16, ADC_SampleTime_239_5Cycles); 

ADC_TempSensorCmd(ENABLE); 

ADC_GetCalibrationFactor(ADC1); 


ADC_Cmd(ADC1, ENABLE); 

while
(!ADC_GetFlagStatus(ADC1, ADC_FLAG_ADEN)); 

ADC_StartOfConversion(ADC1); 

} 



float
Get_Int_Temp(
void
) 

{ 

while
(ADC_GetFlagStatus(ADC1, ADC_FLAG_EOC) == RESET); 

VSense = ADC_GetConversionValue(ADC1); 

return
(
float
)(((V25 - VSense)/AVG_SLOPE)+25); 

} 


/** 

* @brief Main program. 

* @param None 

* @retval None 

*/

int
main(
void
) 

{ 

/*!< At this stage the microcontroller clock setting is already configured, 

this is done through SystemInit() function which is called from startup 

file (startup_stm32f0xx.s) before to branch to application main. 

To reconfigure the default setting of SystemInit() function, refer to 

system_stm32f0xx.c file 

*/


RCC_ClocksTypeDef RCC_Clocks; 


/* SysTick end of count event each 1ms */

RCC_GetClocksFreq(&RCC_Clocks); 

SysTick_Config(RCC_Clocks.HCLK_Frequency / 1000); 


/* Initiate Blink Speed variable */

clock
=SystemCoreClock; 


/* Configure LED3 and LED4 on STM32F0-Discovery */

STM_EVAL_LEDInit(LED3); 

STM_EVAL_LEDInit(LED4); 

STM_EVAL_LEDOff(LED3); 

STM_EVAL_LEDOff(LED4); 


/* Initialize User_Button on STM32F0-Discovery */

STM_EVAL_PBInit(BUTTON_USER, BUTTON_MODE_GPIO); 


Int_Temp_Sensor_Config(); 


while
(1) 

{ 

STM_EVAL_LEDOff(LED4); 

Temp = Get_Int_Temp(); 

Delay(5000); 

STM_EVAL_LEDOn(LED4); 

Delay(500); 

} 


/** 

* @brief Inserts a delay time. 

* @param nTime: specifies the delay time length, in 1 ms. 

* @retval None 

*/

void
Delay(__IO uint32_t nTime) 

{ 

TimingDelay = nTime; 


while
(TimingDelay != 0); 

} 


/** 

* @brief Decrements the TimingDelay variable. 

* @param None 

* @retval None 

*/

void
TimingDelay_Decrement(
void
) 

{ 

if
(TimingDelay != 0x00) 

{ 

TimingDelay--; 

} 

}

[Tesla DeLorean]

Posted on June 23, 2013 at 20:36

A more appropriate cast would be

#define AVG_SLOPE ((float)(TS_CAL1 - TS_CAL2)/0)