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Fix multibyte reads over i2c

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This commit is contained in:
Dominic Spill
2016-12-13 19:05:49 -07:00
parent fac6dd086d
commit cde5ef5bb7
2 changed files with 14 additions and 8 deletions
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20
firmware/common/i2c_lpc.c
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@ -44,17 +44,23 @@ void i2c_lpc_transfer(i2c_bus_t* const bus,
uint8_t* const data_rx, const size_t count_rx
) {
const uint32_t port = (uint32_t)bus->obj;
i2c_tx_start(port);
i2c_tx_byte(port, (slave_address << 1) | I2C_WRITE);
for(size_t i=0; i<count_tx; i++) {
i2c_tx_byte(port, data_tx[i]);
size_t i;
bool ack = false;
if (data_tx && (count_tx > 0)) {
i2c_tx_start(port);
i2c_tx_byte(port, (slave_address << 1) | I2C_WRITE);
for(i=0; i<count_tx; i++) {
i2c_tx_byte(port, data_tx[i]);
}
}
if( data_rx ) {
if (data_rx && (count_rx > 0)) {
i2c_tx_start(port);
i2c_tx_byte(port, (slave_address << 1) | I2C_READ);
for(size_t i=0; i<count_rx; i++) {
data_rx[i] = i2c_rx_byte(port);
for(i=0; i<count_rx; i++) {
/* ACK each byte except the last */
ack = (i!=count_rx-1);
data_rx[i] = i2c_rx_byte(port, ack);
}
}

2
firmware/libopencm3

Submodule firmware/libopencm3 updated: 50c51c7b5f...0ca8913944