stm32f3: Adding convinience functions for sending and receiving i2c data.
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3b274fa2f2
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@ -435,6 +435,8 @@ void i2c_enable_rxdma(uint32_t i2c);
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void i2c_disable_rxdma(uint32_t i2c);
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void i2c_enable_txdma(uint32_t i2c);
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void i2c_disable_txdma(uint32_t i2c);
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void write_i2c(uint32_t i2c, uint8_t i2c_addr, uint8_t reg, uint8_t size, uint8_t *data);
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void read_i2c(uint32_t i2c, uint8_t i2c_addr, uint8_t reg, uint8_t size, uint8_t *data);
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END_DECLS
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@ -398,5 +398,78 @@ void i2c_disable_txdma(uint32_t i2c)
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I2C_CR1(i2c) &= ~I2C_CR1_TXDMAEN;
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}
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void write_i2c(uint32_t i2c, uint8_t i2c_addr, uint8_t reg, uint8_t size, uint8_t *data) {
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int wait;
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int i;
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while (i2c_busy(i2c) == 1) {}
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while (i2c_is_start(i2c) == 1) {}
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/*Setting transfer properties*/
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i2c_set_bytes_to_transfer(i2c, size+1);
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i2c_set_7bit_address(i2c, (i2c_addr & 0x7F));
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i2c_set_write_transfer_dir(i2c);
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i2c_enable_autoend(i2c);
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/*start transfer*/
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i2c_send_start(i2c);
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wait=true;
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while (wait) {
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if (i2c_transmit_int_status(i2c)) {
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wait=false;
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}
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while (i2c_nack(i2c)){}
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}
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i2c_send_data(i2c, reg);
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for (i=0; i<size; i++) {
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wait=true;
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while (wait) {
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if (i2c_transmit_int_status(i2c)) {
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wait=false;
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}
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while (i2c_nack(i2c)){}
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}
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i2c_send_data(i2c, data[i]);
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}
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}
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void read_i2c(uint32_t i2c, uint8_t i2c_addr, uint8_t reg, uint8_t size, uint8_t *data)
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{
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int wait;
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int i;
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while (i2c_busy(i2c) == 1) {}
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while (i2c_is_start(i2c) == 1) {}
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/*Setting transfer properties*/
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i2c_set_bytes_to_transfer(i2c, 1);
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i2c_set_7bit_address(i2c, i2c_addr);
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i2c_set_write_transfer_dir(i2c);
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i2c_disable_autoend(i2c);
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/*start transfer*/
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i2c_send_start(i2c);
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wait=true;
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while (wait)
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{
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if (i2c_transmit_int_status(i2c)) {
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wait=false;
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}
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while (i2c_nack(i2c)){} /* Some error */
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}
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i2c_send_data(i2c, reg);
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while (i2c_is_start(i2c) == 1) {}
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/*Setting transfer properties*/
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i2c_set_bytes_to_transfer(i2c, size);
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i2c_set_7bit_address(i2c, i2c_addr);
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i2c_set_read_transfer_dir(i2c);
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i2c_enable_autoend(i2c);
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/*start transfer*/
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i2c_send_start(i2c);
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for (i=0; i<size; i++) {
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while (i2c_received_data(i2c) == 0) {}
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data[i]=i2c_get_data(i2c);
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}
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}
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/**@}*/
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