262 lines
8.0 KiB
C++
262 lines
8.0 KiB
C++
#ifndef MCP320X_h
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#define MCP320X_h
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#include <DigitalIO.h>
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//==============================================================================
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template<uint8_t CsPin, uint8_t ClkPin, uint8_t DoutPin, uint8_t UsecDelay = 0>
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/** MCP3201 class */
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class MCP3201 {
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public:
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//----------------------------------------------------------------------------
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/** Set pin modes and initial levels. */
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void begin() {
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fastPinMode(ClkPin, 1);
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fastDigitalWrite(ClkPin, 0);
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fastPinMode(CsPin, 1);
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fastDigitalWrite(CsPin, 1);
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fastPinMode(DoutPin, 0);
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}
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//----------------------------------------------------------------------------
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/** Read MCP3201 12-bit ADC
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* \return 16-bit value read.
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*/
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inline __attribute__((always_inline))
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uint16_t read() {
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fastDigitalWrite(CsPin, 0);
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// Start sample.
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mcpAdcDummy(3);
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// Extra sample time.
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if (UsecDelay){
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delayMicroseconds(UsecDelay);
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}
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// End sample.
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mcpAdcDummy(3);
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// Null bit.
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mcpAdcDummy(3);
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uint16_t v = 0;
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readBit(v, 11);
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readBit(v, 10);
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readBit(v, 9);
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readBit(v, 8);
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readBit(v, 7);
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readBit(v, 6);
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readBit(v, 5);
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readBit(v, 4);
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readBit(v, 3);
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readBit(v, 2);
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readBit(v, 1);
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readBit(v, 0);
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fastDigitalWrite(CsPin, 1);
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return v;
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}
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private:
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//----------------------------------------------------------------------------
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/** delay n nops
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* \param[in] n nops to delay, must be a constant so compiler optimizes if().
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*/
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inline __attribute__((always_inline))
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void delayCycles(uint8_t n) {
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if (n & 1) asm volatile("nop\n\t");
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if (n & 2) asm volatile("nop\n\t" "nop\n\t");
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if (n & 4) asm volatile("nop\n\t" "nop\n\t" "nop\n\t" "nop\n\t");
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}
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//----------------------------------------------------------------------------
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/** clock for don't care bits
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*\param[in] delayBefore if true, delay before raising clock*/
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inline __attribute__((always_inline))
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void mcpAdcDummy(uint8_t delayBefore) {
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delayCycles(delayBefore);
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fastDigitalWrite(ClkPin, 1);
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delayCycles(3);
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fastDigitalWrite(ClkPin, 0);
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}
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//----------------------------------------------------------------------------
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inline __attribute__((always_inline))
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void readBit(uint16_t &v, uint8_t b, uint8_t delayRead = 2) {
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delayCycles(3);
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fastDigitalWrite(ClkPin, 1);
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delayCycles(delayRead);
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if (fastDigitalRead(DoutPin)) v |= (1 << b);
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fastDigitalWrite(ClkPin, 0);
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}
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};
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//==============================================================================
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template<uint8_t CsPin, uint8_t ClkPin,
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uint8_t DoutPin, uint8_t DinPin, uint8_t UsecDelay = 0>
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/** MCP3202 class */
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class MCP3202 {
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public:
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//----------------------------------------------------------------------------
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/** Set pin modes and initial levels. */
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void begin() {
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fastPinMode(ClkPin, 1);
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fastDigitalWrite(ClkPin, 0);
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fastPinMode(CsPin, 1);
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fastDigitalWrite(CsPin, 1);
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fastPinMode(DoutPin, 0);
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fastPinMode(DinPin, 1);
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}
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//----------------------------------------------------------------------------
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/** Read MCP3202 12-bit ADC
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* \return 16-bit value read.
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*/
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inline __attribute__((always_inline))
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uint16_t read(uint8_t config) {
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uint16_t v = 0;
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fastDigitalWrite(CsPin, 0);
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// Start bit.
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writeBit(true);
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// Mode bit.
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writeBit(config & 2);
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// Channel Selection and start sample.
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writeBit(config & 1);
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// Extra sample time.
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if (UsecDelay){
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delayMicroseconds(UsecDelay);
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}
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// MSB first format and end sample.
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writeBit(true);
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// Null bit.
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writeBit(true);
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// Data bits.
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readBit(v, 11);
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readBit(v, 10);
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readBit(v, 9);
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readBit(v, 8);
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readBit(v, 7);
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readBit(v, 6);
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readBit(v, 5);
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readBit(v, 4);
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readBit(v, 3);
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readBit(v, 2);
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readBit(v, 1);
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readBit(v, 0);
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fastDigitalWrite(CsPin, 1);
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return v;
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}
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private:
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//----------------------------------------------------------------------------
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/** delay n nops
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* \param[in] n nops to delay, must be a constant so compiler optimizes if().
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*/
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inline __attribute__((always_inline))
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void delayCycles(uint8_t n) {
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if (n & 1) asm volatile("nop\n\t");
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if (n & 2) asm volatile("nop\n\t" "nop\n\t");
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if (n & 4) asm volatile("nop\n\t" "nop\n\t" "nop\n\t" "nop\n\t");
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}
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//----------------------------------------------------------------------------
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/** clock for don't care bits
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*\param[in] delayBefore if true, delay before raising clock*/
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inline __attribute__((always_inline))
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void writeBit(bool value) {
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fastDigitalWrite(DinPin, value);
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fastDigitalWrite(ClkPin, 1);
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delayCycles(2);
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fastDigitalWrite(ClkPin, 0);
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}
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//----------------------------------------------------------------------------
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inline __attribute__((always_inline))
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void readBit(uint16_t &v, uint8_t b, uint8_t delayRead = 1) {
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delayCycles(2);
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fastDigitalWrite(ClkPin, 1);
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delayCycles(delayRead);
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if (fastDigitalRead(DoutPin)) v |= (1 << b);
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fastDigitalWrite(ClkPin, 0);
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}
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};
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//==============================================================================
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template<uint8_t CsPin, uint8_t ClkPin,
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uint8_t DoutPin, uint8_t DinPin, uint8_t UsecDelay = 0>
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/** MCP3204 class */
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class MCP3204 {
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public:
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//----------------------------------------------------------------------------
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/** Set pin modes and initial levels. */
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void begin() {
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fastPinMode(ClkPin, 1);
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fastDigitalWrite(ClkPin, 0);
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fastPinMode(CsPin, 1);
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fastDigitalWrite(CsPin, 1);
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fastPinMode(DoutPin, 0);
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fastPinMode(DinPin, 1);
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}
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//----------------------------------------------------------------------------
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/** Read MCP3204 12-bit ADC
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* \return 16-bit value read.
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*/
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inline __attribute__((always_inline))
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uint16_t read(uint8_t config) {
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uint16_t v = 0;
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fastDigitalWrite(CsPin, 0);
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// Start bit.
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writeBit(true);
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// Mode bit.
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writeBit(config & 8);
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// D2 channel bit.
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writeBit(config & 4);
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// D1 channel bit.
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writeBit(config & 2);
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// D0 channel bit and start sample.
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writeBit(config & 1);
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// Extra sample time.
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if (UsecDelay){
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delayMicroseconds(UsecDelay);
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}
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// End sample cycle.
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writeBit(true);
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// Null bit.
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writeBit(true);
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// Data bits.
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readBit(v, 11);
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readBit(v, 10);
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readBit(v, 9);
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readBit(v, 8);
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readBit(v, 7);
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readBit(v, 6);
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readBit(v, 5);
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readBit(v, 4);
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readBit(v, 3);
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readBit(v, 2);
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readBit(v, 1);
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readBit(v, 0);
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fastDigitalWrite(CsPin, 1);
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return v;
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}
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private:
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//----------------------------------------------------------------------------
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/** delay n nops
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* \param[in] n nops to delay, must be a constant so compiler optimizes if().
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*/
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inline __attribute__((always_inline))
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void delayCycles(uint8_t n) {
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if (n & 1) asm volatile("nop\n\t");
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if (n & 2) asm volatile("nop\n\t" "nop\n\t");
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if (n & 4) asm volatile("nop\n\t" "nop\n\t" "nop\n\t" "nop\n\t");
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}
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//----------------------------------------------------------------------------
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/** clock for don't care bits
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*\param[in] delayBefore if true, delay before raising clock*/
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inline __attribute__((always_inline))
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void writeBit(bool value) {
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fastDigitalWrite(DinPin, value);
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fastDigitalWrite(ClkPin, 1);
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delayCycles(2);
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fastDigitalWrite(ClkPin, 0);
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}
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//----------------------------------------------------------------------------
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inline __attribute__((always_inline))
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void readBit(uint16_t &v, uint8_t b, uint8_t delayRead = 1) {
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delayCycles(2);
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fastDigitalWrite(ClkPin, 1);
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delayCycles(delayRead);
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if (fastDigitalRead(DoutPin)) v |= (1 << b);
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fastDigitalWrite(ClkPin, 0);
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}
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};
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//==============================================================================
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// MCP3204 and MCP3208 use the same code.
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template<uint8_t CsPin, uint8_t ClkPin,
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uint8_t DoutPin, uint8_t DinPin, uint8_t UsecDelay = 0>
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class MCP3208 : public MCP3204<CsPin, ClkPin, DoutPin, DinPin, UsecDelay> {
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};
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#endif // MCP320X_h
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