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add microsecond timer support

master
George Hotz 2017-10-26 18:44:25 -07:00
parent c86a19c1dc
commit e1dd404c9b
2 changed files with 9 additions and 0 deletions
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1
board/gpio.h
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@ -104,6 +104,7 @@ void periph_init() {
RCC->APB1ENR |= RCC_APB1ENR_CAN3EN;
#endif
RCC->APB1ENR |= RCC_APB1ENR_DACEN;
RCC->APB1ENR |= RCC_APB1ENR_TIM2EN;
RCC->APB1ENR |= RCC_APB1ENR_TIM3EN;
//RCC->APB1ENR |= RCC_APB1ENR_TIM4EN;
RCC->APB2ENR |= RCC_APB2ENR_USART1EN;

8
board/main.c
View File

@ -510,6 +510,14 @@ int main() {
USART3->CR2 |= USART_CR2_LINEN;
#endif
// init microsecond system timer
// increments 1000000 times per second
// generate an update to set the prescaler
TIM2->PSC = 48-1;
TIM2->CR1 = TIM_CR1_CEN;
TIM2->EGR = TIM_EGR_UG;
// use TIM2->CNT to read
// enable USB
usb_init();