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| author | jaseg <git@jaseg.net> | 2019-07-06 11:33:47 +0900 |
|---|---|---|
| committer | jaseg <git@jaseg.net> | 2019-07-06 11:33:47 +0900 |
| commit | 4491f72afd80c59d1fc0f1e166b17372b10cdc5a (patch) | |
| tree | 703d95aa100137c05cda29e1388d3a97a4885c19 /i2c.h | |
| download | moargb-4491f72afd80c59d1fc0f1e166b17372b10cdc5a.tar.gz moargb-4491f72afd80c59d1fc0f1e166b17372b10cdc5a.tar.bz2 moargb-4491f72afd80c59d1fc0f1e166b17372b10cdc5a.zip | |
Initial commit
Diffstat (limited to 'i2c.h')
| -rw-r--r-- | i2c.h | 107 |
1 files changed, 107 insertions, 0 deletions
@@ -0,0 +1,107 @@ +#ifndef __I2C_H
+#define __I2C_H
+
+#include "global.h"
+
+// Definitions of I2C analog filter state
+#define I2C_AF_ENABLE ((uint32_t)0x00000000U) // Analog filter is enabled
+#define I2C_AF_DISABLE I2C_CR1_ANFOFF // Analog filter is disabled
+
+// Flags definitions for transmit function
+#define I2C_TX_STOP ((uint32_t)0x00000000U) // Generate STOP condition
+#define I2C_TX_NOSTOP ((uint32_t)0x10000000U) // Don't generate STOP condition
+#define I2C_TX_NOSTART ((uint32_t)0x20000000U) // Don't generate START condition
+#define I2C_TX_CONT ((uint32_t)0x40000000U) // The transmission will be continued
+// Definitions for compatibility with old code using this library
+#define I2C_GENSTOP_YES I2C_TX_STOP
+#define I2C_GENSTOP_NO I2C_TX_NOSTOP
+
+// Definition of bits to reset in CR2 register
+#define I2C_CR2_ALL (I2C_CR2_SADD | \
+ I2C_CR2_NBYTES | \
+ I2C_CR2_RELOAD | \
+ I2C_CR2_AUTOEND | \
+ I2C_CR2_RD_WRN | \
+ I2C_CR2_START | \
+ I2C_CR2_STOP)
+
+// Definition of all bits in ICR register (clear all I2C flags at once)
+#define I2C_ICR_ALL (I2C_ICR_ADDRCF | \
+ I2C_ICR_ALERTCF | \
+ I2C_ICR_ARLOCF | \
+ I2C_ICR_BERRCF | \
+ I2C_ICR_NACKCF | \
+ I2C_ICR_OVRCF | \
+ I2C_ICR_PECCF | \
+ I2C_ICR_STOPCF | \
+ I2C_ICR_TIMOUTCF)
+
+
+// Result of I2C functions
+typedef enum {
+ I2C_ERROR = 0,
+ I2C_SUCCESS = !I2C_ERROR
+} i2cstatus;
+
+
+// Public functions and macros
+
+// Enable I2C peripheral
+// input:
+// I2Cx - pointer to the I2C peripheral (I2C1, etc.)
+static inline void i2c_enable(I2C_TypeDef* I2Cx) {
+ I2Cx->CR1 |= I2C_CR1_PE;
+}
+
+// Disable I2C peripheral
+// input:
+// I2Cx - pointer to the I2C peripheral (I2C1, etc.)
+static inline void i2c_disable(I2C_TypeDef* I2Cx) {
+ I2Cx->CR1 &= ~I2C_CR1_PE;
+}
+
+// Configure I2C noise filters
+// input:
+// I2Cx - pointer to the I2C peripheral (I2C1, etc.)
+// af - analog filter state, I2C_AF_DISABLE or I2C_AF_ENABLE
+// df - digital filter configuration, can be a value in range from 0 to 15
+// zero value means the digital filter is disabled
+// this values means filtering capability up to (df * ti2cclk)
+// note: must be called only when I2C is disabled (PE bit in I2C_CR1 register is reset)
+static inline void i2c_config_filters(I2C_TypeDef* I2Cx, uint32_t af, uint32_t df) {
+ I2Cx->CR1 &= ~(I2C_CR1_ANFOFF | I2C_CR1_DNF);
+ I2Cx->CR1 |= (af & I2C_CR1_ANFOFF) | ((df << I2C_CR1_DNF_Pos) & I2C_CR1_DNF);
+}
+
+// Configure the I2C timings (SDA setup/hold time and SCL high/low period)
+// input:
+// I2Cx - pointer to the I2C peripheral (I2C1, etc.)
+// timing - the value for I2C_TIMINGR register
+// note: must be called only when I2C is disabled (PE bit in I2C_CR1 register is reset)
+static inline void i2c_config_timing(I2C_TypeDef* I2Cx, uint32_t timing) {
+ I2Cx->TIMINGR = timing;
+}
+
+// Generate START condition
+// input:
+// I2Cx - pointer to the I2C peripheral (I2C1, etc.)
+// addr - I2C device address
+// note: 7-bit addressing mode
+static inline void i2c_genstart(I2C_TypeDef* I2Cx, uint32_t addr) {
+ I2Cx->CR2 = (addr & I2C_CR2_SADD) | I2C_CR2_START | I2C_CR2_AUTOEND;
+}
+
+// Generate STOP condition
+// input:
+// I2Cx - pointer to the I2C peripheral (I2C1, etc.)
+static inline void i2c_genstop(I2C_TypeDef* I2Cx) {
+ I2Cx->CR2 |= I2C_CR2_STOP;
+}
+
+
+// Function prototypes
+i2cstatus i2c_is_device_ready(I2C_TypeDef* I2Cx, uint8_t devAddr, uint32_t Trials);
+i2cstatus i2c_transmit(I2C_TypeDef* I2Cx, uint8_t devAddr, const uint8_t *pBuf, uint32_t nbytes, uint32_t flags);
+i2cstatus i2c_receive(I2C_TypeDef* I2Cx, uint8_t devAddr, uint8_t *pBuf, uint32_t nbytes);
+
+#endif // __I2C_H
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