AN3422
Application note
Migration of microcontroller applications
from STM32F1 to STM32L1 series
1
Introduction
For designers of STM32 microcontroller applications, it is important to be able to easily
replace one microcontroller type by another one in the same product family. Migrating an
application to a different microcontroller is often needed, when product requirements grow,
putting extra demands on memory size, or increasing the number of I/Os. On the other
hand, cost reduction objectives may force you to switch to smaller components and shrink
the PCB area.
This application note is written to help you and analyze the steps you need to migrate from
an existing STM32F1 devices based design to STM32L1 devices. It groups together all the
most important information and lists the vital aspects that you need to address.
To migrate your application from STM32F1 series to STM32L1 series, you have to analyze
the hardware migration, the peripheral migration and the firmware migration.
To benefit fully from the information in this application note, the user should be familiar with
the STM32 microcontroller family. You can refer to the following documents that are available
from www.st.com.
●
The STM32F1 family reference manuals (RM0008 and RM0041), the STM32F1
datasheets, and the STM32F1 Flash programming manuals (PM0075, PM0063 and
PM0068).
The STM32L1 family reference manual (RM0038), the STM32L1 datasheets, and the
STM32F1 Flash and EEPROM programming manual (PM0062).
●
For an overview of the whole STM32 series and a comparison of the different features of
each STM32 product series, please refer to AN3364
Migration and compatibility guidelines
for STM32 microcontroller applications.
March 2012
Doc ID 018976 Rev 2
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www.st.com
Contents
AN3422
Contents
1
2
3
4
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
STM32L1 family overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Hardware migration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Peripheral migration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
4.1
4.2
4.3
4.4
4.5
4.6
4.7
4.8
4.9
4.10
4.11
4.12
STM32 product cross-compatibility . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
System architecture . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Memory mapping . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
RCC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
DMA . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
Interrupts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
GPIO . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
EXTI source selection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
FLASH . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
ADC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
PWR . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
RTC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
5
Firmware migration using the library . . . . . . . . . . . . . . . . . . . . . . . . . . 37
5.1
5.2
5.3
5.4
Migration steps . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37
RCC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37
FLASH . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
GPIO . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43
5.4.1
5.4.2
5.4.3
5.4.4
Output mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43
Input mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43
Analog mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43
Alternate function mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44
5.5
5.6
5.7
EXTI . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45
ADC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46
PWR . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47
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Contents
5.8
Backup data registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49
6
Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50
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List of tables
AN3422
List of tables
Table 1.
Table 2.
Table 3.
Table 4.
Table 5.
Table 6.
Table 7.
Table 8.
Table 9.
Table 10.
Table 11.
Table 12.
Table 13.
Table 14.
Table 15.
Table 16.
Table 17.
STM32L1 peripherals compatibility analysis. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
STM32F1 series and STM32L1 series pinout differences . . . . . . . . . . . . . . . . . . . . . . . . . . 8
STM32 peripheral compatibility analysis F1 versus L1 series . . . . . . . . . . . . . . . . . . . . . . 13
IP bus mapping differences between STM32F1 and STM32L1 series. . . . . . . . . . . . . . . . 15
RCC differences between STM32F1 and STM32L1 series . . . . . . . . . . . . . . . . . . . . . . . . 17
Performance versus VCORE ranges . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
Example of migrating system clock configuration code from F1 to L1 . . . . . . . . . . . . . . . . 22
RCC registers used for peripheral access configuration. . . . . . . . . . . . . . . . . . . . . . . . . . . 23
DMA request differences between STM32F1 series and STM32L1 series . . . . . . . . . . . . 24
Interrupt vector differences between STM32F1 series and STM32L1 series . . . . . . . . . . . 26
GPIO differences between STM32F1 series and STM32L1 series . . . . . . . . . . . . . . . . . . 29
FLASH differences between STM32F1 series and STM32L1 series . . . . . . . . . . . . . . . . . 31
ADC differences between STM32F1 series and STM32L1 series . . . . . . . . . . . . . . . . . . . 32
PWR differences between STM32F1 series and STM32L1 series. . . . . . . . . . . . . . . . . . . 34
STM32F10x and STM32L1xx FLASH driver API correspondence . . . . . . . . . . . . . . . . . . . 39
STM32F10x and STM32L1xx PWR driver API correspondence . . . . . . . . . . . . . . . . . . . . 48
Document revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50
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List of figures
List of figures
Figure 1.
Figure 2.
Figure 3.
Figure 4.
Compatible board design: LQFP144 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Compatible board design: LQFP100 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Compatible board design: LQFP64 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Compatible board design: LQFP48 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
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