Mouse code for the MacroRat
mbed-dev/targets/TARGET_Atmel/TARGET_SAM_CortexM0P/drivers/services/delay/sam0/systick_counter.c
- Committer:
- sahilmgandhi
- Date:
- 2017-05-14
- Revision:
- 18:6a4db94011d3
File content as of revision 18:6a4db94011d3:
#include "delay.h" /** * Value used to calculate ms delay. Default to be used with a 8MHz clock; */ static uint32_t cycles_per_ms = 8000000UL / 1000; static uint32_t cycles_per_us = 8000000UL / 1000000; /** * \brief Initialize the delay driver. * * This must be called during start up to initialize the delay routine with * the current used main clock. It must run any time the main CPU clock is changed. */ void delay_init(void) { cycles_per_ms = system_gclk_gen_get_hz(0); cycles_per_ms /= 1000; cycles_per_us = cycles_per_ms / 1000; SysTick->CTRL = SysTick_CTRL_CLKSOURCE_Msk | SysTick_CTRL_ENABLE_Msk; } /** * \brief Delay loop to delay at least n number of microseconds * * \param n Number of microseconds to wait */ void delay_cycles_us( uint32_t n) { while (n--) { /* Devide up to blocks of 10u */ delay_cycles(cycles_per_us); } } /** * \brief Delay loop to delay at least n number of milliseconds * * \param n Number of milliseconds to wait */ void delay_cycles_ms( uint32_t n) { while (n--) { /* Devide up to blocks of 1ms */ delay_cycles(cycles_per_ms); } }