int main(void)
{
time_t then, now;
cpu_init(DEFAULT_CPU_FREQ);
#ifdef CONSOLE_SERIAL
serial_stdio(CONSOLE_PORT);
#endif
#ifdef CONSOLE_SEMIHOSTING
semihosting_stdio(CONSOLE_PORT)
#endif
#ifdef CONSOLE_USB
usb_serial_stdio(NULL);
getch();
#endif
puts("\033[H\033[2JSTR91x A/D Converter Test (" __DATE__ " " __TIME__ ")\n");
puts(revision);
printf("\nCPU Freq:%u Hz Compiler:%s %s %s\n\n", (unsigned int) SystemCoreClock,
__COMPILER__, __VERSION__, __ABI__);
// Turn on peripheral clocks
SCU_APBPeriphClockConfig(__RTC, ENABLE);
SCU_APBPeriphClockConfig(__ADC, ENABLE);
SCU_APBPeriphClockConfig(__GPIO4, ENABLE);
// Configure RTC
RTC_DeInit(); // Reset RTC
// Configure P4.6 as analog input 6
GPIO_DeInit(GPIO4); // Reset GPIO4
GPIO_ANAPinConfig(GPIO_ANAChannel6, ENABLE);
// Configure A/D converter
ADC_DeInit(); // Reset A/D converter
ADC_Cmd(ENABLE); // Power on A/D converter
ADC_PrescalerConfig(0x2); // Conversion clock is 24 MHz
// Sample analog input 6 once a second
then = 0;
for (;;)
{
now = time(NULL);
if (now == then) continue;
then = now;
printf("The value of A/D input 6 is %04X\n", SampleADC(ADC_Channel_6));
}
}
int main(void)
{
u16 Conversion_Value = 0;
#ifdef DEBUG
debug();
#endif
SCU_MCLKSourceConfig(SCU_MCLK_OSC); /*Use OSC as the default clock source*/
SCU_PCLKDivisorConfig(SCU_PCLK_Div1); /* ARM Peripheral bus clokdivisor = 1*/
SCU_APBPeriphClockConfig(__ADC, ENABLE); /* Enable the clock for the ADC */
ADC_DeInit(); /* ADC Deinitialization */
SCU_APBPeriphClockConfig(__TIM01, ENABLE); /* Enable the clock for TIM0 and TIM1 */
TIM_DeInit(TIM0); /* TIM0 Deinitialization */
SCU_APBPeriphClockConfig(__GPIO4, ENABLE); /* Enable the clock for the GPIO4 */
GPIO_DeInit(GPIO4); /* GPIO4 Deinitialization */
SCU_APBPeriphClockConfig(__GPIO3, ENABLE); /* Enable the clock for the GPIO3 */
GPIO_DeInit(GPIO3); /* GPIO3 Deinitialization */
/* Configure the GPIO4 pin 5 as analog input */
GPIO_ANAPinConfig(GPIO_ANAChannel5, ENABLE);
/* GPIO6 configuration (PWM on P3.0, pin 55) */
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_0;
GPIO_InitStructure.GPIO_Direction = GPIO_PinOutput;
GPIO_InitStructure.GPIO_Type = GPIO_Type_PushPull;
GPIO_InitStructure.GPIO_IPConnected = GPIO_IPConnected_Enable;
GPIO_InitStructure.GPIO_Alternate = GPIO_OutputAlt3;
GPIO_Init(GPIO3,&GPIO_InitStructure);
/* TIM0 Structure Initialization */
TIM_StructInit(&TIM_InitStructure);
/* TIM0 Configuration in PWM Mode */
TIM_InitStructure.TIM_Mode = TIM_PWM;
TIM_InitStructure.TIM_Clock_Source = TIM_CLK_APB;
TIM_InitStructure.TIM_Prescaler = 0x0;
TIM_InitStructure.TIM_Pulse_Level_1 = TIM_HIGH;
TIM_InitStructure.TIM_Period_Level = TIM_LOW;
TIM_InitStructure.TIM_Pulse_Length_1 = 0x200;
TIM_InitStructure.TIM_Full_Period = 0x404;
TIM_Init (TIM0, &TIM_InitStructure);
/* Start the counter of TIM0 */
TIM_CounterCmd(TIM0, TIM_START);
/* ADC Structure Initialization */
ADC_StructInit(&ADC_InitStructure);
/* Configure the ADC in continuous mode conversion */
ADC_InitStructure.ADC_Channel_5_Mode = ADC_NoThreshold_Conversion;
ADC_InitStructure.ADC_Select_Channel = ADC_Channel_5;
ADC_InitStructure.ADC_Scan_Mode = DISABLE;
ADC_InitStructure.ADC_Conversion_Mode = ADC_Continuous_Mode;
/* Enable the ADC */
ADC_Cmd(ENABLE);
/* Prescaler config */
ADC_PrescalerConfig(0x0);
/* Configure the ADC */
ADC_Init(&ADC_InitStructure);
/* Start the conversion */
ADC_ConversionCmd(ADC_Conversion_Start);
while(1)
{
/* Wait until conversion completion */
while(ADC_GetFlagStatus(ADC_FLAG_ECV) == RESET);
/* Get the conversion value */
Conversion_Value = ADC_GetConversionValue(ADC_Channel_5);
/* Clear the end of conversion flag */
ADC_ClearFlag(ADC_FLAG_ECV);
/* Set the new pulse of the TIM0 */
TIM_SetPulse(TIM0, TIM_PWM_OC1_Channel, Conversion_Value);
}
}
