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esp32_Adafruit_BusIO
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Merge pull request #31 from adafruit/cachedval 

add some basic caching support for chips with write-only registers
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siddacious 2020-06-30 11:45:55 -07:00 committed by GitHub
parent 22ea3a921c 11c6b2d3ba
commit f2a192c10b
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GPG Key ID: 4AEE18F83AFDEB23
2 changed files with 11 additions and 0 deletions
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9
Adafruit_BusIO_Register.cpp
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@ -131,6 +131,9 @@ bool Adafruit_BusIO_Register::write(uint32_t value, uint8_t numbytes) {
return false; return false;
} }
// store a copy
_cached = value;
for (int i = 0; i < numbytes; i++) { for (int i = 0; i < numbytes; i++) {
if (_byteorder == LSBFIRST) { if (_byteorder == LSBFIRST) {
_buffer[i] = value & 0xFF; _buffer[i] = value & 0xFF;
@ -166,6 +169,12 @@ uint32_t Adafruit_BusIO_Register::read(void) {
return value; return value;
} }
/*!
* @brief Read cached data from last time we wrote to this register
* @return Returns 0xFFFFFFFF on failure, value otherwise
*/
uint32_t Adafruit_BusIO_Register::readCached(void) { return _cached; }
/*! /*!
* @brief Read a buffer of data from the register location * @brief Read a buffer of data from the register location
* @param buffer Pointer to data to read into * @param buffer Pointer to data to read into

2
Adafruit_BusIO_Register.h
View File

@ -35,6 +35,7 @@ public:
bool read(uint8_t *value); bool read(uint8_t *value);
bool read(uint16_t *value); bool read(uint16_t *value);
uint32_t read(void); uint32_t read(void);
uint32_t readCached(void);
bool write(uint8_t *buffer, uint8_t len); bool write(uint8_t *buffer, uint8_t len);
bool write(uint32_t value, uint8_t numbytes = 0); bool write(uint32_t value, uint8_t numbytes = 0);
@ -51,6 +52,7 @@ private:
uint8_t _width, _addrwidth, _byteorder; uint8_t _width, _addrwidth, _byteorder;
uint8_t _buffer[4]; // we wont support anything larger than uint32 for uint8_t _buffer[4]; // we wont support anything larger than uint32 for
// non-buffered read // non-buffered read
uint32_t _cached = 0;
}; };
/*! /*!