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Last commit 20 Feb 2019 by 
mbed official
Diff: targets/hal/TARGET_STM/TARGET_NUCLEO_L152RE/spi_api.c
- Revision:
- 129:0182c99221bc
- Parent:
- 118:b44c45162f28
- Child:
- 139:e3413eddde57
--- a/targets/hal/TARGET_STM/TARGET_NUCLEO_L152RE/spi_api.c Wed Mar 19 18:20:52 2014 +0000
+++ b/targets/hal/TARGET_STM/TARGET_NUCLEO_L152RE/spi_api.c Thu Mar 20 11:45:07 2014 +0000
@@ -38,42 +38,39 @@
static const PinMap PinMap_SPI_MOSI[] = {
{PA_7, SPI_1, STM_PIN_DATA(GPIO_Mode_AF, GPIO_OType_PP, GPIO_PuPd_UP, GPIO_AF_SPI1)},
- {PA_12, SPI_1, STM_PIN_DATA(GPIO_Mode_AF, GPIO_OType_PP, GPIO_PuPd_UP, GPIO_AF_SPI1)}, // REMAP
- {PB_4, SPI_1, STM_PIN_DATA(GPIO_Mode_AF, GPIO_OType_PP, GPIO_PuPd_UP, GPIO_AF_SPI1)}, // REMAP2
- {PB_15, SPI_2, STM_PIN_DATA(GPIO_Mode_AF, GPIO_OType_PP, GPIO_PuPd_UP, GPIO_AF_SPI2)},
- {PB_5, SPI_3, STM_PIN_DATA(GPIO_Mode_AF, GPIO_OType_PP, GPIO_PuPd_UP, GPIO_AF_SPI3)},
- {PC_12, SPI_3, STM_PIN_DATA(GPIO_Mode_AF, GPIO_OType_PP, GPIO_PuPd_UP, GPIO_AF_SPI3)}, // REMAP
-
+ {PA_12, SPI_1, STM_PIN_DATA(GPIO_Mode_AF, GPIO_OType_PP, GPIO_PuPd_UP, GPIO_AF_SPI1)},
+ {PB_5, SPI_1, STM_PIN_DATA(GPIO_Mode_AF, GPIO_OType_PP, GPIO_PuPd_UP, GPIO_AF_SPI1)},
+ //{PB_5, SPI_3, STM_PIN_DATA(GPIO_Mode_AF, GPIO_OType_PP, GPIO_PuPd_UP, GPIO_AF_SPI3)},
+ {PB_15, SPI_2, STM_PIN_DATA(GPIO_Mode_AF, GPIO_OType_PP, GPIO_PuPd_UP, GPIO_AF_SPI2)},
+ {PC_12, SPI_3, STM_PIN_DATA(GPIO_Mode_AF, GPIO_OType_PP, GPIO_PuPd_UP, GPIO_AF_SPI3)},
{NC, NC, 0}
};
static const PinMap PinMap_SPI_MISO[] = {
{PA_6, SPI_1, STM_PIN_DATA(GPIO_Mode_AF, GPIO_OType_PP, GPIO_PuPd_UP, GPIO_AF_SPI1)},
- {PA_11, SPI_1, STM_PIN_DATA(GPIO_Mode_AF, GPIO_OType_PP, GPIO_PuPd_UP, GPIO_AF_SPI1)}, // REMAP
- {PB_5, SPI_1, STM_PIN_DATA(GPIO_Mode_AF, GPIO_OType_PP, GPIO_PuPd_UP, GPIO_AF_SPI1)}, // REMAP2
- {PA_6, SPI_1, STM_PIN_DATA(GPIO_Mode_AF, GPIO_OType_PP, GPIO_PuPd_UP, GPIO_AF_SPI1)},
+ {PA_11, SPI_1, STM_PIN_DATA(GPIO_Mode_AF, GPIO_OType_PP, GPIO_PuPd_UP, GPIO_AF_SPI1)},
+ {PB_4, SPI_1, STM_PIN_DATA(GPIO_Mode_AF, GPIO_OType_PP, GPIO_PuPd_UP, GPIO_AF_SPI1)},
+ //{PB_4, SPI_3, STM_PIN_DATA(GPIO_Mode_AF, GPIO_OType_PP, GPIO_PuPd_UP, GPIO_AF_SPI3)},
{PB_14, SPI_2, STM_PIN_DATA(GPIO_Mode_AF, GPIO_OType_PP, GPIO_PuPd_UP, GPIO_AF_SPI2)},
- {PB_4 , SPI_3, STM_PIN_DATA(GPIO_Mode_AF, GPIO_OType_PP, GPIO_PuPd_UP, GPIO_AF_SPI3)},
{PC_11, SPI_3, STM_PIN_DATA(GPIO_Mode_AF, GPIO_OType_PP, GPIO_PuPd_UP, GPIO_AF_SPI3)},
{NC, NC, 0}
};
static const PinMap PinMap_SPI_SCLK[] = {
{PA_5, SPI_1, STM_PIN_DATA(GPIO_Mode_AF, GPIO_OType_PP, GPIO_PuPd_UP, GPIO_AF_SPI1)},
- {PB_3, SPI_1, STM_PIN_DATA(GPIO_Mode_AF, GPIO_OType_PP, GPIO_PuPd_UP, GPIO_AF_SPI1)}, // REMAP
+ {PB_3, SPI_1, STM_PIN_DATA(GPIO_Mode_AF, GPIO_OType_PP, GPIO_PuPd_UP, GPIO_AF_SPI1)},
+ //{PB_3, SPI_3, STM_PIN_DATA(GPIO_Mode_AF, GPIO_OType_PP, GPIO_PuPd_UP, GPIO_AF_SPI3)},
{PB_13, SPI_2, STM_PIN_DATA(GPIO_Mode_AF, GPIO_OType_PP, GPIO_PuPd_UP, GPIO_AF_SPI2)},
- {PB_3, SPI_3, STM_PIN_DATA(GPIO_Mode_AF, GPIO_OType_PP, GPIO_PuPd_UP, GPIO_AF_SPI3)},
{PC_10, SPI_3, STM_PIN_DATA(GPIO_Mode_AF, GPIO_OType_PP, GPIO_PuPd_UP, GPIO_AF_SPI3)},
{NC, NC, 0}
};
-// Only used in Slave mode
static const PinMap PinMap_SPI_SSEL[] = {
- {PA_4, SPI_1, STM_PIN_DATA(GPIO_Mode_AF, GPIO_OType_PP, GPIO_PuPd_UP, GPIO_AF_SPI1)},
- {PA_15, SPI_1, STM_PIN_DATA(GPIO_Mode_AF, GPIO_OType_PP, GPIO_PuPd_UP, GPIO_AF_SPI1)}, // REMAP
+ {PA_4, SPI_1, STM_PIN_DATA(GPIO_Mode_AF, GPIO_OType_PP, GPIO_PuPd_UP, GPIO_AF_SPI1)},
+ //{PA_4, SPI_3, STM_PIN_DATA(GPIO_Mode_AF, GPIO_OType_PP, GPIO_PuPd_UP, GPIO_AF_SPI3)},
+ {PA_15, SPI_1, STM_PIN_DATA(GPIO_Mode_AF, GPIO_OType_PP, GPIO_PuPd_UP, GPIO_AF_SPI1)},
+ //{PA_15, SPI_3, STM_PIN_DATA(GPIO_Mode_AF, GPIO_OType_PP, GPIO_PuPd_UP, GPIO_AF_SPI3)},
{PB_12, SPI_2, STM_PIN_DATA(GPIO_Mode_AF, GPIO_OType_PP, GPIO_PuPd_UP, GPIO_AF_SPI2)},
- {PA_4 , SPI_3, STM_PIN_DATA(GPIO_Mode_AF, GPIO_OType_PP, GPIO_PuPd_UP, GPIO_AF_SPI3)},
- {PA_15, SPI_3, STM_PIN_DATA(GPIO_Mode_AF, GPIO_OType_PP, GPIO_PuPd_UP, GPIO_AF_SPI3)},
{NC, NC, 0}
};
@@ -83,15 +80,15 @@
SPI_Cmd(spi, DISABLE);
- SPI_InitStructure.SPI_Mode = obj->mode;
- SPI_InitStructure.SPI_NSS = obj->nss;
- SPI_InitStructure.SPI_Direction = SPI_Direction_2Lines_FullDuplex;
- SPI_InitStructure.SPI_DataSize = obj->bits;
- SPI_InitStructure.SPI_CPOL = obj->cpol;
- SPI_InitStructure.SPI_CPHA = obj->cpha;
+ SPI_InitStructure.SPI_Mode = obj->mode;
+ SPI_InitStructure.SPI_NSS = obj->nss;
+ SPI_InitStructure.SPI_Direction = SPI_Direction_2Lines_FullDuplex;
+ SPI_InitStructure.SPI_DataSize = obj->bits;
+ SPI_InitStructure.SPI_CPOL = obj->cpol;
+ SPI_InitStructure.SPI_CPHA = obj->cpha;
SPI_InitStructure.SPI_BaudRatePrescaler = obj->br_presc;
- SPI_InitStructure.SPI_FirstBit = SPI_FirstBit_MSB;
- SPI_InitStructure.SPI_CRCPolynomial = 7;
+ SPI_InitStructure.SPI_FirstBit = SPI_FirstBit_MSB;
+ SPI_InitStructure.SPI_CRCPolynomial = 7;
SPI_Init(spi, &SPI_InitStructure);
SPI_Cmd(spi, ENABLE);
@@ -133,7 +130,7 @@
obj->bits = SPI_DataSize_8b;
obj->cpol = SPI_CPOL_Low;
obj->cpha = SPI_CPHA_1Edge;
- obj->br_presc = SPI_BaudRatePrescaler_16; // 1 MHz
+ obj->br_presc = SPI_BaudRatePrescaler_256;
if (ssel == NC) { // Master
obj->mode = SPI_Mode_Master;
@@ -194,26 +191,31 @@
}
void spi_frequency(spi_t *obj, int hz) {
- // Get SPI clock frequency
- uint32_t PCLK = SystemCoreClock;
-
- // Choose the baud rate divisor (between 2 and 256)
- uint32_t divisor = PCLK / hz;
-
- // Find the nearest power-of-2
- divisor = (divisor > 0 ? divisor-1 : 0);
- divisor |= divisor >> 1;
- divisor |= divisor >> 2;
- divisor |= divisor >> 4;
- divisor |= divisor >> 8;
- divisor |= divisor >> 16;
- divisor++;
-
- uint32_t baud_rate = __builtin_ffs(divisor) - 2;
-
- // Save new value
- obj->br_presc = ((baud_rate > 7) ? (7 << 3) : (baud_rate << 3));
-
+ // Note: The frequencies are obtained with SPI clock = 32 MHz (APB1 & APB2 clocks)
+ if (hz < 250000) {
+ obj->br_presc = SPI_BaudRatePrescaler_256; // 125 kHz
+ }
+ else if ((hz >= 250000) && (hz < 500000)) {
+ obj->br_presc = SPI_BaudRatePrescaler_128; // 250 kHz
+ }
+ else if ((hz >= 500000) && (hz < 1000000)) {
+ obj->br_presc = SPI_BaudRatePrescaler_64; // 500 kHz
+ }
+ else if ((hz >= 1000000) && (hz < 2000000)) {
+ obj->br_presc = SPI_BaudRatePrescaler_32; // 1 MHz
+ }
+ else if ((hz >= 2000000) && (hz < 4000000)) {
+ obj->br_presc = SPI_BaudRatePrescaler_16; // 2 MHz
+ }
+ else if ((hz >= 4000000) && (hz < 8000000)) {
+ obj->br_presc = SPI_BaudRatePrescaler_8; // 4 MHz
+ }
+ else if ((hz >= 8000000) && (hz < 16000000)) {
+ obj->br_presc = SPI_BaudRatePrescaler_4; // 8 MHz
+ }
+ else { // >= 16000000
+ obj->br_presc = SPI_BaudRatePrescaler_2; // 16 MHz
+ }
init_spi(obj);
}
