![](/media/cache/profiles/fe04e05fbe48920b8ba90bea2ddfe60b.50x50_q85.jpg)
Test program to show cpu running at 84MHz
Dependencies: ST_401_84MHZ mbed
Speed up the CPU to 84MHz to get a SPI clock of 20MHz.
main.cpp
- Committer:
- dreschpe
- Date:
- 2014-03-05
- Revision:
- 2:d53a7002da28
- Parent:
- 1:aa61af968c8a
File content as of revision 2:d53a7002da28:
#include "mbed.h" #include "stm32f4xx_hal.h" #include "ST_F401_84MHZ.h" SPI device(SPI_MOSI, SPI_MISO, SPI_SCK); int main() { int i = 0; SystemClock_Config_84MHz_internal(); // speed up to 84 MHz HAL_RCC_MCOConfig(RCC_MCO2, RCC_MCO2SOURCE_SYSCLK, RCC_MCODIV_1); // output SYSCLOCK to pin PC9 to monitor frequency device.format(8,0); device.frequency(20000000); // 20 MHz SPI Clock to test the clock setting while(1) { device.write(0x55); device.write(i++); device.write(0xE0); wait_us(50); } }