Merge pull request #1431 from hathach/nrf52_i2c_1kb
fix #1422 correct i2c max xfer len (size in bits)
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84060e6124
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@ -37,19 +37,21 @@
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#include "nrfx_spim.h"
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#include "nrf_gpio.h"
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// all TWI instances have the same max size
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// 16 bits for 840, 10 bits for 810, 8 bits for 832
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#define I2C_MAX_XFER_LEN ((1UL << TWIM0_EASYDMA_MAXCNT_SIZE) - 1)
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STATIC twim_peripheral_t twim_peripherals[] = {
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#if NRFX_CHECK(NRFX_TWIM0_ENABLED)
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// SPIM0 and TWIM0 share an address.
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{ .twim = NRFX_TWIM_INSTANCE(0),
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.in_use = false,
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.max_xfer_size = TWIM0_EASYDMA_MAXCNT_SIZE,
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.in_use = false
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},
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#endif
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#if NRFX_CHECK(NRFX_TWIM1_ENABLED)
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// SPIM1 and TWIM1 share an address.
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{ .twim = NRFX_TWIM_INSTANCE(1),
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.in_use = false,
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.max_xfer_size = TWIM1_EASYDMA_MAXCNT_SIZE,
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.in_use = false
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},
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#endif
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};
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@ -198,24 +200,25 @@ void common_hal_busio_i2c_unlock(busio_i2c_obj_t *self) {
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}
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uint8_t common_hal_busio_i2c_write(busio_i2c_obj_t *self, uint16_t addr, const uint8_t *data, size_t len, bool stopBit) {
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if(len == 0)
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if(len == 0) {
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return common_hal_busio_i2c_probe(self, addr) ? 0 : MP_ENODEV;
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}
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const uint32_t max_xfer_size = self->twim_peripheral->max_xfer_size;
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const uint32_t parts = len / max_xfer_size;
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const uint32_t remainder = len % max_xfer_size;
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nrfx_err_t err = NRFX_SUCCESS;
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nrfx_twim_enable(&self->twim_peripheral->twim);
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for (uint32_t i = 0; i < parts; ++i) {
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err = nrfx_twim_tx(&self->twim_peripheral->twim, addr, data + i * max_xfer_size, max_xfer_size, !stopBit);
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if (err != NRFX_SUCCESS)
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break;
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}
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// break into MAX_XFER_LEN transaction
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while ( len ) {
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const size_t xact_len = MIN(len, I2C_MAX_XFER_LEN);
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if ((remainder > 0) && (err == NRFX_SUCCESS))
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err = nrfx_twim_tx(&self->twim_peripheral->twim, addr, data + parts * max_xfer_size, remainder, !stopBit);
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if ( NRFX_SUCCESS != (err = nrfx_twim_tx(&self->twim_peripheral->twim, addr, data, xact_len, !stopBit)) ) {
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break;
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}
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len -= xact_len;
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data += xact_len;
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}
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nrfx_twim_disable(&self->twim_peripheral->twim);
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@ -223,24 +226,25 @@ uint8_t common_hal_busio_i2c_write(busio_i2c_obj_t *self, uint16_t addr, const u
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}
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uint8_t common_hal_busio_i2c_read(busio_i2c_obj_t *self, uint16_t addr, uint8_t *data, size_t len) {
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if(len == 0)
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if(len == 0) {
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return 0;
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}
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const uint32_t max_xfer_size = self->twim_peripheral->max_xfer_size;
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const uint32_t parts = len / max_xfer_size;
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const uint32_t remainder = len % max_xfer_size;
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nrfx_err_t err = NRFX_SUCCESS;
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nrfx_twim_enable(&self->twim_peripheral->twim);
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for (uint32_t i = 0; i < parts; ++i) {
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err = nrfx_twim_rx(&self->twim_peripheral->twim, addr, data + i * max_xfer_size, max_xfer_size);
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if (err != NRFX_SUCCESS)
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break;
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}
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// break into MAX_XFER_LEN transaction
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while ( len ) {
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const size_t xact_len = MIN(len, I2C_MAX_XFER_LEN);
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if ((remainder > 0) && (err == NRFX_SUCCESS))
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err = nrfx_twim_rx(&self->twim_peripheral->twim, addr, data + parts * max_xfer_size, remainder);
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if ( NRFX_SUCCESS != (err = nrfx_twim_rx(&self->twim_peripheral->twim, addr, data, xact_len)) ) {
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break;
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}
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len -= xact_len;
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data += xact_len;
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}
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nrfx_twim_disable(&self->twim_peripheral->twim);
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@ -34,7 +34,6 @@
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typedef struct {
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nrfx_twim_t twim;
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bool in_use;
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uint8_t max_xfer_size;
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} twim_peripheral_t;
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typedef struct {
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