Easily STM32F407 Discovery Programming with Mbed
STM32F407 Discovery board does not directly support STM32F407 discovery board MBED online STM32F407 discovery board IDE, but the mcu on STM32F407 discovery board is also used in another official MBED board (Seeed Studio Arch Max v1.1 ). Therefore, you can do STM32F407 discovery programming by treating it as an Arch Max board.
It is an easy way to do quick prototyping with STM32F407 discovery board MBED ‘s online IDE, no need to install STM32F407 discovery Keil/IAR/AC6 on PC and go through painful setup, common stuff like STM32F407 discovery board ADC/STM32F407 discovery board PWM/DAC/STM32F407 discovery pinout GPIO/STM32F407 discovery board UART/SPI/STM32F407 discovery I2C can be done with minimal configuration, also tested STM32F407 discovery kit onboard STM32F407 discovery board accelerometer.
Step 1: Go to mbed.org and log in/register
Step 2: Select Platform Seeed Arch Max
Step 3: Edit, compile and download the code
The following code demonstrates the STM32F407 discovery pinout GPIO, STM32F407 discovery board ADC, serial, STM32F407 discovery PWM and on-board STM32F407 discovery board accelerometer functions
STM32F407 discovery board pinout GPIO and STM32F407 discovery PWM initialization:
DigitalOut rLED(PD_14); // on board red LED, DO
DigitalOut bLED(PD_15); // on board blue LED. DO
DigitalOut gLED(PD_12); // on board green LED, DO
DigitalOut oLED(PD_13); // on board orange LED, DO
PwmOut GLED(PA_9); // on board green LED,
PWMDigitalIn pbSW(PA_0); // on board blue PUSH Switch, active high DI
Serial port and STM32F407 discovery board ADC:
Serial serial(PA_2,PA_3); // serial com tx, rx UART
AnalogIn adcPB0(PB_0); // PB0 as 12 bit ADC
Serial baud rate and print:
// set serial baud and print welcome msg //
serial.printf(“Welcome to STM32F407 Development with mbedOS \n\r”);
STM32F407 discovery PWM frequency and duty cycle:
GLED.period(1.0f/freq); // set pwm period
GLED.write(duty/100.0f); // set pwm duty cycle
STM32F407 discovery board LED blink:
rLED = 1;
gLED = 1;
rLED = 0;
gLED = 0;
STM32F407 discovery board ADC reads:
// adc value read // adcval = 4095*adcPB0.read_u16()/65535; // 12 bit value
It is not recommended to use “unlabeled” pins, they may interfere with STM32F407 discovery onboard hardware.
Update 1: The DAC is available for PA4 and PA5.
A 12-bit DAC was tested on pins A4 and A5. it works. However, the STM32F407 discovery board accelerometer and audio may not be used with the DAC for other applications (same pins).
// Before main
Output analog voltage:
// set up 1 volt on dac 1
dac1 = 0.333f; // vdd* 0.333 = 3.0*0.333 = 1.0 volt
// set up 1.5 volt on dac 2
dac2 = 0.5f; // vdd*0.5 = 1.5 volt
Update 2: 20×4 STM32F407 discovery LCD support
Tested the STM32F407 discovery LCD with STM32F407 discovery board mbed and it works great! A 5 volt display will have no problem running on 3.3 volt logic.
1. Not all functions will work according to the STM32F407 discovery board pinout diagram above. For example, STM32F407 discovery PWM on PD13 will not work when programming with mbed. Because, the mbed compiler processes the code according to the pin map of the Arch Max board.
For pin-specific functions that will definitely work, see the attached pinout diagram below.
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