kopia lustrzana https://github.com/pimoroni/pimoroni-pico
VL53L5CX: Fix 32k runtime allocation in platform i2c WrMulti
rodzic
637f6d18ca
commit
f79b2efa9e
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@ -104,17 +104,64 @@ uint8_t WrMulti(
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uint8_t *p_values,
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uint8_t *p_values,
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uint32_t size)
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uint32_t size)
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{
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{
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uint8_t buf[size + 2];
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uint8_t buf[2];
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buf[0] = RegisterAdress >> 8;
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buf[0] = RegisterAdress >> 8;
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buf[1] = RegisterAdress & 0xff;
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buf[1] = RegisterAdress & 0xff;
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memcpy(buf + 2, p_values, size);
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// Send the 16-bit address with no STOP condition
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int result = i2c_write_blocking(p_platform->i2c, p_platform->address, buf, sizeof(buf), true);
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if(i2c_write_blocking(p_platform->i2c, p_platform->address, buf, size + 2, false) != PICO_ERROR_GENERIC) {
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// Handle an error early... it gets dicey from here
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return 0;
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if(result == PICO_ERROR_GENERIC) return 255;
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// The VL53L5CX does not support "Repeated Start" and the Pico's I2C API doesn't
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// let us send more bytes without sending another start condition.
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// The horrow below lets us send out "p_values" followed by a STOP condition,
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// without having to copy everything into a temporary buffer.
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uint8_t *src = p_values;
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// Send the rest of the data, followed by a STOP condition
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// This re-implements the relevant portion of i2c_write_blocking_internal which is NOT sent a timeout check function by i2c_write_blocking
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for (int byte_ctr = 0; byte_ctr < size; ++byte_ctr) {
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bool last = byte_ctr == size - 1;
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p_platform->i2c->hw->data_cmd =
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bool_to_bit(last) << I2C_IC_DATA_CMD_STOP_LSB | *src++;
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// Wait until the transmission of the address/data from the internal
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// shift register has completed. For this to function correctly, the
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// TX_EMPTY_CTRL flag in IC_CON must be set. The TX_EMPTY_CTRL flag
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// was set in i2c_init.
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do {
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tight_loop_contents();
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} while (!(p_platform->i2c->hw->raw_intr_stat & I2C_IC_RAW_INTR_STAT_TX_EMPTY_BITS));
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if (p_platform->i2c->hw->tx_abrt_source) {
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// Note clearing the abort flag also clears the reason, and
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// this instance of flag is clear-on-read! Note also the
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// IC_CLR_TX_ABRT register always reads as 0.
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p_platform->i2c->hw->clr_tx_abrt;
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// An abort on the LAST byte means things are probably fine
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if(last) {
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// TODO Could there be an abort while waiting for the STOP
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// condition here? If so, additional code would be needed here
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// to take care of the abort.
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do {
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tight_loop_contents();
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} while (!(p_platform->i2c->hw->raw_intr_stat & I2C_IC_RAW_INTR_STAT_STOP_DET_BITS));
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} else {
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// Ooof, unhandled abort. Fail?
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return 255;
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}
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}
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}
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}
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return 255;
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// Not sure it matters where we clear this, but by default a "nostop" style write
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// will set this flag so the next transaction starts with a "Repeated Start."
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p_platform->i2c->restart_on_next = false;
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return 0;
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}
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}
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uint8_t RdMulti(
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uint8_t RdMulti(
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