void configure_adc(
UINT8 ref, UINT8 samp_rate, UINT8 samp_time, UINT8 presc,
UINT8 ressel, UINT8 gain, UINT8 neg_ain, UINT8 ain
){
configure_global_ports();
enable_adc_clk();
adc_ptr = adc;
bankA_ptr = bankA;
disable_adc();
/*
BIN = (0xFFF)(V_in * GAIN / V_ref)
*/
adc_ptr->REFCTRL.reg |= ref; // Select a reference
adc_ptr->AVGCTRL.reg |= samp_rate; // Now collect a number
// of samples at a time.
// Total sampling time length = (SAMPLEN+1)*(Clk_ADC/2)
adc_ptr->SAMPCTRL.reg = samp_time; // Set sampling time
adc_ptr->CTRLB.reg |= presc << 8u; // Set clock prescaler
adc_ptr->CTRLB.reg |= ressel << 4; // Select resolution
adc_ptr->INPUTCTRL.reg |= gain << 24u; // Select Gain
adc_ptr->INPUTCTRL.reg |=
neg_ain << 8 // Map the negative terminal
| ain // Map the positive terminal
;
enable_adc();
}
void start_timer(){
TCCR1A = 0;
TCNT1 = 53035; //~=10Hz
TCCR1B = (1<<CS11);
TIMSK1 = (1<<TOIE1); //timer1 interrupt enabled
enable_adc();
ADCSRA |= (1<<ADSC); //start ADC conversion
}
void saradc_enable(void)
{
int i;
enable_bandgap();
set_clock_src(0); //0-xtal, 1-clk81
//set adc clock as 1.28Mhz @sys=27MHz
set_clock_divider(20);
enable_clock();
enable_adc();
set_sample_mode(DIFF_MODE);
set_tempsen(0);
disable_fifo_irq();
disable_continuous_sample();
disable_chan0_delta();
disable_chan1_delta();
set_input_delay(10, INPUT_DELAY_TB_1US);
set_sample_delay(10, SAMPLE_DELAY_TB_1US);
set_block_delay(10, BLOCK_DELAY_TB_1US);
// channels sampling mode setting
for(i=0; i<AML_ADC_SARADC_CHAN_NUM; i++) {
set_sample_sw(i, IDLE_SW);
set_sample_mux(i, g_chan_mux[i]);
}
// idle mode setting
set_idle_sw(IDLE_SW);
set_idle_mux(g_chan_mux[AML_ADC_CHAN_0]);
// detect mode setting
set_detect_sw(DETECT_SW);
set_detect_mux(g_chan_mux[AML_ADC_CHAN_0]);
disable_detect_sw();
disable_detect_pullup();
set_detect_irq_pol(0);
disable_detect_irq();
set_cal_voltage(7);
enable_sample_engine();
#if AML_ADC_SAMPLE_DEBUG
printf("ADCREG reg0 =%x\n", get_reg(PP_SAR_ADC_REG0));
printf("ADCREG ch list =%x\n",get_reg(PP_SAR_ADC_CHAN_LIST));
printf("ADCREG avg =%x\n", get_reg(PP_SAR_ADC_AVG_CNTL));
printf("ADCREG reg3 =%x\n", get_reg(PP_SAR_ADC_REG3));
printf("ADCREG ch72 sw =%x\n",get_reg(PP_SAR_ADC_AUX_SW));
printf("ADCREG ch10 sw =%x\n",get_reg(PP_SAR_ADC_CHAN_10_SW));
printf("ADCREG detect&idle=%x\n",get_reg(PP_SAR_ADC_DETECT_IDLE_SW));
#endif //AML_ADC_SAMPLE_DEBUG
select_temp();
enable_temp();
enable_temp__();
udelay(1000);
}
static void saradc_reset(void)
{
int i;
//set adc clock as 1.28Mhz
set_clock_divider(20);
enable_clock();
enable_adc();
#if MESON_CPU_TYPE >= MESON_CPU_TYPE_MESON8
enable_bandgap();
#endif
set_sample_mode(DIFF_MODE);
set_tempsen(0);
disable_fifo_irq();
disable_continuous_sample();
disable_chan0_delta();
disable_chan1_delta();
set_input_delay(10, INPUT_DELAY_TB_1US);
set_sample_delay(10, SAMPLE_DELAY_TB_1US);
set_block_delay(10, BLOCK_DELAY_TB_1US);
// channels sampling mode setting
for(i=0; i<SARADC_CHAN_NUM; i++) {
set_sample_sw(i, IDLE_SW);
set_sample_mux(i, chan_mux[i]);
}
// idle mode setting
set_idle_sw(IDLE_SW);
set_idle_mux(chan_mux[CHAN_0]);
// detect mode setting
set_detect_sw(DETECT_SW);
set_detect_mux(chan_mux[CHAN_0]);
disable_detect_sw();
disable_detect_pullup();
set_detect_irq_pol(0);
disable_detect_irq();
// set_sc_phase();
enable_sample_engine();
// printk("ADCREG reg0 =%x\n", get_reg(SAR_ADC_REG0));
// printk("ADCREG ch list =%x\n", get_reg(SAR_ADC_CHAN_LIST));
// printk("ADCREG avg =%x\n", get_reg(SAR_ADC_AVG_CNTL));
// printk("ADCREG reg3=%x\n", get_reg(SAR_ADC_REG3));
// printk("ADCREG ch72 sw=%x\n", get_reg(SAR_ADC_AUX_SW));
// printk("ADCREG ch10 sw=%x\n", get_reg(SAR_ADC_CHAN_10_SW));
// printk("ADCREG detect&idle=%x\n", get_reg(SAR_ADC_DETECT_IDLE_SW));
}
static void saradc_init(void)
{
int i;
enable_bandgap();
//low speed, set to clk81 without division
set_clock_src(1); //0-xtal, 1-clk81
set_clock_divider(0);
enable_clock();
enable_adc();
set_sample_mode(DIFF_MODE);
set_tempsen(0);
disable_fifo_irq();
disable_continuous_sample();
disable_chan0_delta();
disable_chan1_delta();
set_input_delay(10, INPUT_DELAY_TB_1US);
set_sample_delay(10, SAMPLE_DELAY_TB_1US);
set_block_delay(10, BLOCK_DELAY_TB_1US);
aml_set_reg32_bits(P_AO_SAR_ADC_DELAY, 3, 27, 2);
// channels sampling mode setting
for(i=0; i<AML_ADC_SARADC_CHAN_NUM; i++) {
set_sample_sw(i, IDLE_SW);
set_sample_mux(i, g_chan_mux[i]);
}
// idle mode setting
set_idle_sw(IDLE_SW);
set_idle_mux(g_chan_mux[AML_ADC_CHAN_0]);
// detect mode setting
set_detect_sw(DETECT_SW);
set_detect_mux(g_chan_mux[AML_ADC_CHAN_0]);
disable_detect_sw();
disable_detect_pullup();
set_detect_irq_pol(0);
disable_detect_irq();
set_cal_voltage(7);
set_sc_phase();
enable_sample_engine();
udelay(1000);
while (get_fifo_cnt()) {
i = get_fifo_sample() & 0x3ff;
}
}
static inline void saradc_power_control(int on)
{
if (on) {
#if MESON_CPU_TYPE >= MESON_CPU_TYPE_MESON8
enable_bandgap();
udelay(10);
#endif
enable_adc();
udelay(5);
enable_clock();
enable_sample_engine();
}
else {
disable_sample_engine();
disable_clock();
disable_adc();
#if MESON_CPU_TYPE >= MESON_CPU_TYPE_MESON8
disable_bandgap();
#endif
}
}
