Created
March 9, 2018 11:01
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Conversor Analógico/Digital de 12-bits.
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/* | |
MCP3201 - Conversor Analógico/Digital de 12-bits. | |
Autor: Tiago Melo | |
Blog: Microcontrolandos | |
Compilador: MikroC PRO PIC | |
Bibliotecas: LCD, Lcd_Constants, Conversions, C_String | |
*/ | |
//Pinos do MCP3201. | |
sbit MCP3201_Clock at RB0_bit; | |
sbit MCP3201_Data at RB1_bit; | |
sbit MCP3201_CS at RB2_bit; | |
sbit MCP3201_Clock_Direction at TRISB0_bit; | |
sbit MCP3201_Data_Direction at TRISB1_bit; | |
sbit MCP3201_CS_Direction at TRISB2_bit; | |
//Pinos do LCD. | |
sbit LCD_RS at RC0_bit; | |
sbit LCD_EN at RC1_bit; | |
sbit LCD_D4 at RC2_bit; | |
sbit LCD_D5 at RC3_bit; | |
sbit LCD_D6 at RC4_bit; | |
sbit LCD_D7 at RC5_bit; | |
sbit LCD_RS_Direction at TRISC0_bit; | |
sbit LCD_EN_Direction at TRISC1_bit; | |
sbit LCD_D4_Direction at TRISC2_bit; | |
sbit LCD_D5_Direction at TRISC3_bit; | |
sbit LCD_D6_Direction at TRISC4_bit; | |
sbit LCD_D7_Direction at TRISC5_bit; | |
void MCP3201_Init() { | |
MCP3201_CS_Direction = 0; | |
MCP3201_Clock_Direction = 0; | |
MCP3201_Data_Direction = 1; | |
MCP3201_CS = 1; | |
MCP3201_Clock = 0; | |
} | |
unsigned int MCP3201_Read() { | |
char i; | |
unsigned value; | |
//Inicia a conversão. | |
MCP3201_Clock = 1; | |
MCP3201_CS = 0; | |
//Lê 15 bits. Os 3 primeiros serão ignorados. | |
for(i = 0; i < 15; i++) { | |
value <<= 1; | |
MCP3201_Clock = 1; | |
Delay_us(1); | |
MCP3201_Clock = 0; | |
Delay_us(1); | |
//Lê o valor após um pulso de descida do clock. | |
value |= MCP3201_Data; | |
} | |
MCP3201_Clock = 0; | |
MCP3201_CS = 1; | |
return (value & 0x0FFF); | |
} | |
float MCP3201_Convert(unsigned int raw, float vref) { | |
return raw * vref / 4096.0; | |
} | |
void main() { | |
char texto[12]; | |
//Inicializa o MCP3201. | |
MCP3201_Init(); | |
//Inicializa o LCD. | |
Lcd_Init(); | |
Lcd_Cmd(_LCD_CLEAR); | |
Lcd_Cmd(_LCD_CURSOR_OFF); | |
while(1) { | |
//Lê o valor. | |
unsigned valor = MCP3201_Read(); | |
//Converte o valor lido em um valor de tensão com 5V como referência. | |
float tensao = MCP3201_Convert(valor, 5); | |
//Converte em texto. | |
FloatToStr(tensao, texto); | |
//Escreve no LCD. | |
Lcd_Out(2, 1, texto); | |
Lcd_Chr_CP('V'); | |
//Faz nada por 1s. | |
Delay_ms(1000); | |
} | |
} |
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