【R7F0C809】AD sampling

ljj3166

【R7F0C809】AD sampling [Copy link]

I took a look at the AD configuration of C809 last night. It is also relatively simple. The main functions are:  Peripheral enable register 0 (PER0)  A/D converter mode register 0 (ADM0)  A/D converter mode register 2 (ADM2)  A/D conversion result high-order storage register (ADCRH)  A/D conversion result low-order storage register (ADCRL)  Analog input channel specification register (ADS) Then there are 2 registers for port mode:  Port mode registers 0, 1 (PM0, PM1)  Port mode control registers 0, 1 (PMC0, PMC1) After configuration, AD values can be collected. Regarding the reference voltage of AD, the data sheet states that it can reach the power supply voltage. If powered by 5V, the maximum input voltage of 5V can be measured. Code

1. void R_ADC_Create(void) //AD initialization { ADCEN = 1U; /* supply AD clock */ ADM0 = 0x00U; /* disable AD conversion and clear ADM0 register */ ADMK = 1U; /* disable INTAD interrupt */ ADIF = 0U; /* clear INTAD interrupt flag */ /* Set INTAD low priority */ ADPR1 = 1U; ADPR0 = 1U; ADM0 = 0x02U; /* fCLK/8 */ ADM2 = 0x00U; /* 10 bits */ } void R_ADC1_Start(void)//AIN1 starts { ADS = 0x01U; /* ANI1 */ ADIF = 0U; /* clear INTAD interrupt flag */ ADMK = 0U; /* enable INTAD interrupt */ ADCS = 1U; /* enable AD conversion */ } void R_ADC0_Start(void)//AIN2 starts { ADS = 0x00U; /* ANI0 */ ADIF = 0U; /* clear INTAD interrupt flag */ ADMK = 0U; /* enable INTAD interrupt */ ADCS = 1U; /* enable AD conversion */ } ......

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The manual recommends that after starting the AD channel, the MCU should enter halt mode to obtain more accurate AD values. The acquisition buffers of all channels share the conversion result registers (ADCRH, ADCRL). It is worth noting that AIN0 and serial port TX pins are multiplexed.

1. R_ADC0_Start(); /* Start AD converter */ HALT(); ADIF = 0U; /* Clear INTAD request */ R_ADC_Get_Result( &result_buffer0 ); /* Get AIN0 result */ R_ADC1_Start(); /* Start AD converter */ HALT(); /* wait for UART Rx interrupt */ ADIF = 0U; /* Clear INTAD request */ R_ADC_Get_Result( &result_buffer1 ); /* Get AIN1 result */

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Where

1. void R_ADC_Get_Result(uint16_t *buffer) { *buffer = ((uint16_t)ADCRH << 8 | ADCRL) >> 6; }

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Well, basically all the peripherals you want to use are driven here, so let's think about the hardware solution.

574433742

:hug: OP's speed,,,,