diff options
Diffstat (limited to 'libmaple')
| -rw-r--r-- | libmaple/i2c.c | 40 | ||||
| -rw-r--r-- | libmaple/include/libmaple/i2c.h | 13 | ||||
| -rw-r--r-- | libmaple/include/libmaple/i2c_common.h | 2 |
3 files changed, 9 insertions, 46 deletions
diff --git a/libmaple/i2c.c b/libmaple/i2c.c index 6c609d9..b8e622d 100644 --- a/libmaple/i2c.c +++ b/libmaple/i2c.c @@ -28,11 +28,9 @@ /** * @file libmaple/i2c.c * @author Perry Hung <perry@leaflabs.com> - * @author Barry Carter <barry.carter@gmail.com> * @brief Inter-Integrated Circuit (I2C) support. * - * Master and Slave supported - * Slave code added Barry Carter 2012 + * Currently, only master mode is supported. */ #include "i2c_private.h" @@ -220,26 +218,6 @@ void i2c_master_enable(i2c_dev *dev, uint32 flags) { dev->state = I2C_STATE_IDLE; } -/** - * @brief Initialize an I2C device as slave (and master) - * @param dev Device to enable - * @param flags Bitwise or of the following I2C options: - * I2C_FAST_MODE: 400 khz operation, - * I2C_DUTY_16_9: 16/9 Tlow/Thigh duty cycle (only applicable for - * fast mode), - * I2C_BUS_RESET: Reset the bus and clock out any hung slaves on - * initialization, - * I2C_10BIT_ADDRESSING: Enable 10-bit addressing, - * I2C_REMAP: (deprecated, STM32F1 only) Remap I2C1 to SCL/PB8 - * SDA/PB9. - * I2C_SLAVE_DUAL_ADDRESS: Slave can respond on 2 i2C addresses - * I2C_SLAVE_GENERAL_CALL: SLA+W broadcast to all general call - * listeners on bus. Addr 0x00 - * I2C_SLAVE_USE_RX_BUFFER: Use a buffer to receive the incoming - * data. Callback at end of recv - * I2C_SLAVE_USE_TX_BUFFER: Use a buffer to transmit data. - * Callback will be called before tx - */ void i2c_slave_enable(i2c_dev *dev, uint32 flags) { i2c_disable(dev); i2c_master_enable(dev, dev->config_flags | flags); @@ -344,10 +322,11 @@ void _i2c_irq_handler(i2c_dev *dev) { */ dev->timestamp = systick_uptime(); - /* - * Add Slave support + /* Add Slave support + * Barry Carter 2012 + * barry.carter@gmail.com */ - + /* Check to see if MSL master slave bit is set */ if ((sr2 & I2C_SR2_MSL) != I2C_SR2_MSL) { /* 0 = slave mode 1 = master */ @@ -480,15 +459,6 @@ void _i2c_irq_handler(i2c_dev *dev) { /* The callback with the data will happen on a NACK of the last data byte. * This is handled in the error IRQ (AF bit) */ - /* Handle the case where the master misbehaves by sending no NACK */ - if (dev->state != I2C_STATE_IDLE) { - if (dev->state == I2C_STATE_SL_RX) { - if (dev->i2c_slave_recv_callback != NULL) (*(dev->i2c_slave_recv_callback))(dev->i2c_slave_msg); - } - else { - if (dev->i2c_slave_transmit_callback != NULL) (*(dev->i2c_slave_transmit_callback))(dev->i2c_slave_msg); - } - } } sr1 = sr2 = 0; diff --git a/libmaple/include/libmaple/i2c.h b/libmaple/include/libmaple/i2c.h index 5a9da58..d4eac61 100644 --- a/libmaple/include/libmaple/i2c.h +++ b/libmaple/include/libmaple/i2c.h @@ -29,19 +29,12 @@ * @file libmaple/include/libmaple/i2c.h * @brief Inter-Integrated Circuit (I2C) peripheral support * - * Supports Master and Slave. - * Master Usage notes: + * Currently master-only. Usage notes: * * - Enable an I2C device with i2c_master_enable(). * - Initialize an array of struct i2c_msg to suit the bus * transactions (reads/writes) you wish to perform. * - Call i2c_master_xfer() to do the work. - * - * Slave Usage notes: - * - Enable I2C slave by calling i2c_slave_enable(). - * Check flags for usage. Enabling master also enabled slave. - * - initialise the i2c_msg struct and the data buffer - * - initialise the callback functions */ #ifndef _LIBMAPLE_I2C_H_ @@ -208,7 +201,7 @@ typedef struct i2c_msg { #define I2C_SLAVE_USE_RX_BUFFER 0x10 // Use a buffered message when doing a slave recv #define I2C_SLAVE_USE_TX_BUFFER 0x20 // Use a buffered message when doing a slave transmit #define I2C_SLAVE_DUAL_ADDRESS 0x40 // Enable the dual slave address scheme -#define I2C_SLAVE_GENERAL_CALL 0x80 // Enable the general call on address 0x00 +#define I2C_SLAVE_GENERAL_CALL 0x80 // Enable the dual slave address scheme void i2c_master_enable(i2c_dev *dev, uint32 flags); #define I2C_ERROR_PROTOCOL (-1) @@ -418,7 +411,7 @@ static inline void i2c_set_trise(i2c_dev *dev, uint32 trise) { dev->regs->TRISE = trise; } -/* +/* Barry Carter * Slave support */ diff --git a/libmaple/include/libmaple/i2c_common.h b/libmaple/include/libmaple/i2c_common.h index 93e17e2..5debcb8 100644 --- a/libmaple/include/libmaple/i2c_common.h +++ b/libmaple/include/libmaple/i2c_common.h @@ -93,7 +93,7 @@ typedef struct i2c_dev { volatile i2c_state state; /**< Device state */ uint32 config_flags; /**< Configuration flags */ - /* + /* Barry Carter * Slave implementation. Callback functions in this struct allow * for a separate callback function for each I2C unit available onboard */ |