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nrf: Fix SPI transfers with data larger than HW allows

This commit is contained in:
arturo182 2018-07-04 20:24:41 +02:00
parent 321daa3523
commit ac74edb4e4
1 changed files with 49 additions and 9 deletions
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58
ports/nrf/common-hal/busio/SPI.c
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@ -33,6 +33,8 @@
#define INST_NO 2
#endif
#define MAX_XFER_SIZE ((1U << NRFX_CONCAT_3(SPIM, INST_NO, _EASYDMA_MAXCNT_SIZE)) - 1)
// Convert frequency to clock-speed-dependent value
static nrf_spim_frequency_t baudrate_to_spim_frequency(const uint32_t baudrate) {
if (baudrate <= 125000)
@ -152,30 +154,68 @@ bool common_hal_busio_spi_write(busio_spi_obj_t *self, const uint8_t *data, size
if (len == 0)
return true;
const nrfx_spim_xfer_desc_t xfer = NRFX_SPIM_XFER_TX(data, len);
const nrfx_err_t err = nrfx_spim_xfer(&self->spim, &xfer, 0);
const uint32_t parts = len / MAX_XFER_SIZE;
const uint32_t remainder = len % MAX_XFER_SIZE;
return (err == NRFX_SUCCESS);
for (uint32_t i = 0; i < parts; ++i) {
const nrfx_spim_xfer_desc_t xfer = NRFX_SPIM_XFER_TX(data + i * MAX_XFER_SIZE, MAX_XFER_SIZE);
if (nrfx_spim_xfer(&self->spim, &xfer, 0) != NRFX_SUCCESS)
return false;
}
if (remainder > 0) {
const nrfx_spim_xfer_desc_t xfer = NRFX_SPIM_XFER_TX(data + parts * MAX_XFER_SIZE, remainder);
if (nrfx_spim_xfer(&self->spim, &xfer, 0) != NRFX_SUCCESS)
return false;
}
return true;
}
bool common_hal_busio_spi_read(busio_spi_obj_t *self, uint8_t *data, size_t len, uint8_t write_value) {
if (len == 0)
return true;
const nrfx_spim_xfer_desc_t xfer = NRFX_SPIM_XFER_RX(data, len);
const nrfx_err_t err = nrfx_spim_xfer(&self->spim, &xfer, 0);
const uint32_t parts = len / MAX_XFER_SIZE;
const uint32_t remainder = len % MAX_XFER_SIZE;
return (err == NRFX_SUCCESS);
for (uint32_t i = 0; i < parts; ++i) {
const nrfx_spim_xfer_desc_t xfer = NRFX_SPIM_XFER_RX(data + i * MAX_XFER_SIZE, MAX_XFER_SIZE);
if (nrfx_spim_xfer(&self->spim, &xfer, 0) != NRFX_SUCCESS)
return false;
}
if (remainder > 0) {
const nrfx_spim_xfer_desc_t xfer = NRFX_SPIM_XFER_RX(data + parts * MAX_XFER_SIZE, remainder);
if (nrfx_spim_xfer(&self->spim, &xfer, 0) != NRFX_SUCCESS)
return false;
}
return true;
}
bool common_hal_busio_spi_transfer(busio_spi_obj_t *self, uint8_t *data_out, uint8_t *data_in, size_t len) {
if (len == 0)
return true;
const nrfx_spim_xfer_desc_t xfer = NRFX_SPIM_SINGLE_XFER(data_out, len, data_in, len);
const nrfx_err_t err = nrfx_spim_xfer(&self->spim, &xfer, 0);
const uint32_t parts = len / MAX_XFER_SIZE;
const uint32_t remainder = len % MAX_XFER_SIZE;
return (err == NRFX_SUCCESS);
for (uint32_t i = 0; i < parts; ++i) {
const nrfx_spim_xfer_desc_t xfer = NRFX_SPIM_SINGLE_XFER(data_out + i * MAX_XFER_SIZE, MAX_XFER_SIZE,
data_in + i * MAX_XFER_SIZE, MAX_XFER_SIZE);
if (nrfx_spim_xfer(&self->spim, &xfer, 0) != NRFX_SUCCESS)
return false;
}
if (remainder > 0) {
const nrfx_spim_xfer_desc_t xfer = NRFX_SPIM_SINGLE_XFER(data_out + parts * MAX_XFER_SIZE, remainder,
data_in + parts * MAX_XFER_SIZE, remainder);
if (nrfx_spim_xfer(&self->spim, &xfer, 0) != NRFX_SUCCESS)
return false;
}
return true;
}
uint32_t common_hal_busio_spi_get_frequency(busio_spi_obj_t* self) {