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Data that is written to/read from external flash using QSPI needs to be in RAM and WORD aligned.

pull/10380/head
j3hill 2019-04-11 13:24:33 -05:00
parent f56808f9bf
commit f4b4ac76ea
1 changed files with 48 additions and 17 deletions
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65
targets/TARGET_NORDIC/TARGET_NRF5x/qspi_api.c
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@ -263,17 +263,19 @@ qspi_status_t qspi_frequency(qspi_t *obj, int hz)
qspi_status_t qspi_write(qspi_t *obj, const qspi_command_t *command, const void *data, size_t *length)
{
// length needs to be rounded up to the next WORD (4 bytes)
if ((*length & WORD_MASK) > 0) {
// flash address and buffer length must be divisible by 4
if ((*length & WORD_MASK) > 0 ||
(command->address.value & WORD_MASK) > 0) {
return QSPI_STATUS_INVALID_PARAMETER;
}
qspi_status_t status = qspi_prepare_command(obj, command, true);
if (status != QSPI_STATUS_OK) {
return status;
}
if (is_word_aligned(data)) {
if (is_word_aligned(data) &&
nrf_drv_is_in_RAM(data)) {
// write here does not return how much it transfered, we return transfered all
ret_code_t ret = nrf_drv_qspi_write(data, *length, command->address.value);
if (ret == NRF_SUCCESS ) {
@ -283,7 +285,7 @@ qspi_status_t qspi_write(qspi_t *obj, const qspi_command_t *command, const void
}
}
else {
// if the data buffer is not WORD/4-byte aligned, use an aligned buffer on the stack
// if the data buffer is not WORD/4-byte aligned or in RAM, use an aligned buffer on the stack
uint32_t aligned_buffer[WORD_COUNT];
uint32_t pos = 0;
size_t bytes_to_write = *length;
@ -298,6 +300,7 @@ qspi_status_t qspi_write(qspi_t *obj, const qspi_command_t *command, const void
if (ret != NRF_SUCCESS ) {
return QSPI_STATUS_ERROR;
}
pos += diff;
bytes_to_write -= diff;
}
@ -307,8 +310,9 @@ qspi_status_t qspi_write(qspi_t *obj, const qspi_command_t *command, const void
qspi_status_t qspi_read(qspi_t *obj, const qspi_command_t *command, void *data, size_t *length)
{
// length needs to be rounded up to the next WORD (4 bytes)
if ((*length & WORD_MASK) > 0) {
// flash address and buffer length must be divisible by 4
if ((*length & WORD_MASK) > 0 ||
(command->address.value & WORD_MASK) > 0) {
return QSPI_STATUS_INVALID_PARAMETER;
}
@ -316,19 +320,46 @@ qspi_status_t qspi_read(qspi_t *obj, const qspi_command_t *command, void *data,
if (command->instruction.value == READSFDP_opcode) {
qspi_status_t status = sfdp_read(obj, command, data, length );
return status;
} else {
qspi_status_t status = qspi_prepare_command(obj, command, false);
if (status != QSPI_STATUS_OK) {
return status;
}
}
ret_code_t ret = nrf_drv_qspi_read(data, *length, command->address.value);
if (ret == NRF_SUCCESS ) {
return QSPI_STATUS_OK;
} else {
return QSPI_STATUS_ERROR;
qspi_status_t status = qspi_prepare_command(obj, command, false);
if (status != QSPI_STATUS_OK) {
return status;
}
if (is_word_aligned(data) &&
nrf_drv_is_in_RAM(data)) {
ret_code_t ret = nrf_drv_qspi_read(data, *length, command->address.value);
if (ret == NRF_SUCCESS ) {
return QSPI_STATUS_OK;
} else {
return QSPI_STATUS_ERROR;
}
}
else {
// if the data buffer is not WORD/4-byte aligned or in RAM, use an aligned buffer on the stack
uint32_t aligned_buffer[WORD_COUNT];
uint32_t pos = 0;
size_t bytes_to_read = *length;
while(pos < *length) {
size_t diff = bytes_to_read <= sizeof(aligned_buffer) ? bytes_to_read : sizeof(aligned_buffer);
// read one buffer over QSPI
ret_code_t ret = nrf_drv_qspi_read(aligned_buffer, diff, command->address.value+pos);
if (ret != NRF_SUCCESS ) {
return QSPI_STATUS_ERROR;
}
// copy into original read buffer
memcpy(&((uint8_t *)data)[pos], aligned_buffer, diff);
pos += diff;
bytes_to_read -= diff;
}
}
return QSPI_STATUS_OK;
}
qspi_status_t qspi_command_transfer(qspi_t *obj, const qspi_command_t *command, const void *tx_data, size_t tx_size, void *rx_data, size_t rx_size)