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This commit is contained in:
Andreas Mieke 2018-04-03 17:18:28 +02:00
parent d109bae8d7
commit 9a18bd88f0
22 changed files with 286 additions and 122 deletions
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6
Mieke/SW/MT/piezo.c
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@ -4,11 +4,14 @@ volatile uint32_t *PiezoSTick, PiezoSTickCur, Freq;
void init_piezo(volatile uint32_t *SysTickCnt)
{
// Enable GPIOB clock
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOB, ENABLE);
// Create gpio struct and fill it with default values
GPIO_InitTypeDef gpio;
GPIO_StructInit(&gpio);
// Set PB0 to output push pull
gpio.GPIO_Mode = GPIO_Mode_Out_PP;
gpio.GPIO_Pin = GPIO_Pin_0;
GPIO_Init(GPIOB, &gpio);
@ -21,10 +24,13 @@ void run_piezo()
{
uint8_t pstate = 0x0;
PiezoSTickCur = *PiezoSTick;
// Run for one second
while((*PiezoSTick - PiezoSTickCur) <= 1000)
{
Freq = *PiezoSTick;
// Wait for 1 millisecond
while((*PiezoSTick - Freq) <= 1);
// Toggle output
if (pstate) {
pstate = ~pstate;
GPIO_WriteBit(GPIOB, GPIO_Pin_0, Bit_SET);