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code VD cho ADC va xuat ra UẢT port
Code:
// Used GPIO3.28 = AIN7 (ADC7:AD1.0) Measure Voltage
// Display Result on UART0(9600,N,8,1)
#include <LPC22xx.H> // LPC2214 MPU Register
#include <stdio.h> // For Used Function printf
void init_serial0 (void); // Used Initial UART0 From "Serial0.c"
unsigned int val; // ADC Result (HEX)
float volt; // ADC Result Volt
int main(void)
{
init_serial0(); // Initial UART0 = 9600,N,8,1
printf("\nET-JR ARM7 LPC2214 --> TEST ADC-7(P3.28)\n"); // Call prinff Function
//Initial ADC7 (GPIO-3.28) By Set PINSEL2[5:4=11]
PINSEL2 |= 0x00000030; // Select ADC7 Pin Connect P3.28
// Initial ADC7 (ADCR=0x01210080)
ADCR &= 0x00000000; // Clear All Bit Control
ADCR |= 0x00000080; // Select ADC = AIN7
ADCR |= 0x00000600; // ADC Clock = VBP(PCLK) / 7
ADCR |= 0x00010000; // Busrt = 1 = Conversion Continue
ADCR &= 0xFFF1FFFF; // CLKS = 000 = 10Bit : 11 Cycle Clock Conversion
ADCR |= 0x00200000; // PDN = 1 = Active ADC Module
ADCR &= 0xFF3FFFFF; // TEST[1:0] = 00 = Normal Mode
ADCR &= 0xF7FFFFFF; // EDGE = 0 = Conversion on Falling Edge
ADCR |= 0x01000000; // START = 001 = Start Conversion Now
// Start Test Read ADC8 and Display on UART0 //
while(1) // Loop Continue
{
do // Loop Read ADC7
{
val = ADDR; // Read ADC Data Register
}
while ((val & 0x80000000) == 0); // Wait ADC Conversion Complete
val = (val >> 6) & 0x03FF; // Shift ADC Result to Integer
volt = val * 3.3 / 1023.0; // Volt = ADC Result x [3.3V / 1024]
printf("\rADC7 Result = %1.3f Volt.",volt); // Display 3-Digit Result(0-3.3V)
}
}
/****************************************************/
#include <LPC22xx.H> // LPC2214 definitions
#define CR 0x0D
/******************************/
/* Initial UART0 = 9600,N,8,1 */
/* VPB(pclk) = 29.4912 MHz */
/******************************/
void init_serial0 (void)
{
PINSEL0 &= 0xFFFFFFF0; // Reset P0.0,P0.1 Pin Config
PINSEL0 |= 0x00000001; // Select P0.0 = TxD(UART0)
PINSEL0 |= 0x00000004; // Select P0.1 = RxD(UART0)
U0LCR &= 0xFC; // Reset Word Select(1:0)
U0LCR |= 0x03; // Data Bit = 8 Bit
U0LCR &= 0xFB; // Stop Bit = 1 Bit
U0LCR &= 0xF7; // Parity = Disable
U0LCR &= 0xBF; // Disable Break Control
U0LCR |= 0x80; // Enable Programming of Divisor Latches
// U0DLM:U0DLL = 29.4912MHz / [16 x Baud]
// = 29.4912MHz / [16 x 9600]
// = 192 = 0x00C0
U0DLM = 0x00; // Program Divisor Latch(192) for 9600 Baud
U0DLL = 0xC0;
U0LCR &= 0x7F; // Disable Programming of Divisor Latches
U0FCR |= 0x01; // FIF0 Enable
U0FCR |= 0x02; // RX FIFO Reset
U0FCR |= 0x04; // TX FIFO Reset
U0FCR &= 0x3F;
}
/****************************/
/* Write Character To UART0 */
/****************************/
int putchar (int ch)
{
if (ch == '\n')
{
while (!(U0LSR & 0x20)); // Wait TXD Buffer Empty
U0THR = CR; // Write CR
}
while (!(U0LSR & 0x20)); // Wait TXD Buffer Empty
return (U0THR = ch); // Write Character
}
/*****************************/
/* Read Character From UART0 */
/*****************************/
int getchar (void)
{
while (!(U0LSR & 0x01)); // Wait RXD Receive Data Ready
return (U0RBR); // Get Receice Data & Return
}
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! Hôm nay em mạo mụi pót tiep các sử dụng timer trong LPC2000
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