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Tweaks based on review comments

This commit is contained in:
Scott Shawcroft 2022-12-02 10:19:31 -08:00
parent 255e997345
commit f7504ff857
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GPG Key ID: 0DFD512649C052DA
2 changed files with 4 additions and 3 deletions
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5
ports/raspberrypi/common-hal/analogbufio/BufferedIn.c
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@ -79,7 +79,6 @@ void common_hal_analogbufio_bufferedin_construct(analogbufio_bufferedin_obj_t *s
// sample_rate is forced to be >= 1 in shared-bindings
float clk_div = (float)ADC_CLOCK_INPUT / (float)sample_rate;
mp_printf(&mp_plat_print, "clk_div %f for %d\n", (double)clk_div, sample_rate);
adc_set_clkdiv(clk_div);
// Set up the DMA to start transferring data as soon as it appears in FIFO
@ -122,7 +121,9 @@ uint32_t common_hal_analogbufio_bufferedin_readinto(analogbufio_bufferedin_obj_t
// RP2040 Implementation Detail
// Fills the supplied buffer with ADC values using DMA transfer.
// If the buffer is 8-bit, then values are 8-bit shifted and error bit is off.
// If buffer is 16-bit, then values are not shifted and error bit is present.
// If buffer is 16-bit, then values are 12-bit and error bit is present. We
// stretch the 12-bit value to 16-bits and truncate the number of valid
// samples at the first sample with the error bit set.
// Number of transfers is always the number of samples which is the array
// byte length divided by the bytes_per_sample.
uint dma_size = DMA_SIZE_8;

2
shared-bindings/analogbufio/BufferedIn.c
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@ -47,7 +47,7 @@
//| import array
//|
//| length = 1000
//| mybuffer = array.array("H", 0x0000 for i in range(length))
//| mybuffer = array.array("H", [0x0000] * length)
//| rate = 500000
//| adcbuf = analogbufio.BufferedIn(board.GP26, sample_rate=rate)
//| adcbuf.readinto(mybuffer)