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drivers: spi_bitbang: Increase supported word size to 32 bits

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This change introduces support for words up to 32 bits size
to the spi_bitbang driver

Signed-off-by: Michal Morsisko <morsisko@gmail.com>
This commit is contained in:
Michal Morsisko 2024-09-17 00:12:21 +02:00 • committed by Anas Nashif
commit e87e0542b8
1 changed files with 18 additions and 4 deletions
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22
drivers/spi/spi_bitbang.c
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@ -44,13 +44,19 @@ static int spi_bitbang_configure(const struct spi_bitbang_config *info,
const int bits = SPI_WORD_SIZE_GET(config->operation); const int bits = SPI_WORD_SIZE_GET(config->operation);
if (bits > 16) { if (bits > 32) {
LOG_ERR("Word sizes > 16 bits not supported"); LOG_ERR("Word sizes > 32 bits not supported");
return -ENOTSUP; return -ENOTSUP;
} }
data->bits = bits; data->bits = bits;
data->dfs = ((data->bits - 1) / 8) + 1; data->dfs = ((data->bits - 1) / 8) + 1;
/* As there is no uint24_t, it is assumed uint32_t will be used as the buffer base type. */
if (data->dfs == 3) {
data->dfs = 4;
}
if (config->frequency > 0) { if (config->frequency > 0) {
/* convert freq to period, the extra /2 is due to waiting /* convert freq to period, the extra /2 is due to waiting
* twice in each clock cycle. The '2000' is an upscale factor. * twice in each clock cycle. The '2000' is an upscale factor.
@ -147,10 +153,14 @@ static int spi_bitbang_transceive(const struct device *dev,
const uint32_t wait_us = data->wait_us; const uint32_t wait_us = data->wait_us;
while (spi_context_tx_buf_on(ctx) || spi_context_rx_buf_on(ctx)) { while (spi_context_tx_buf_on(ctx) || spi_context_rx_buf_on(ctx)) {
uint16_t w = 0; uint32_t w = 0;
if (ctx->tx_len) { if (ctx->tx_len) {
switch (data->dfs) { switch (data->dfs) {
case 4:
case 3:
w = *(uint32_t *)(ctx->tx_buf);
break;
case 2: case 2:
w = *(uint16_t *)(ctx->tx_buf); w = *(uint16_t *)(ctx->tx_buf);
break; break;
@ -160,7 +170,7 @@ static int spi_bitbang_transceive(const struct device *dev,
} }
} }
uint16_t r = 0; uint32_t r = 0;
uint8_t i = 0; uint8_t i = 0;
int b = 0; int b = 0;
bool do_read = false; bool do_read = false;
@ -209,6 +219,10 @@ static int spi_bitbang_transceive(const struct device *dev,
if (spi_context_rx_buf_on(ctx)) { if (spi_context_rx_buf_on(ctx)) {
switch (data->dfs) { switch (data->dfs) {
case 4:
case 3:
*(uint32_t *)(ctx->rx_buf) = r;
break;
case 2: case 2:
*(uint16_t *)(ctx->rx_buf) = r; *(uint16_t *)(ctx->rx_buf) = r;
break; break;